TM 5-6675-244-15D E P A R T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L

ORGANlZATIONAL, DS, GS, AND DEPOT MAINTENANCE MANUAL

INCLUDING REPAIR PARTS AND SPECIAL TOOL LISTS

TARGET SET, SURVEYING: CIRCULAR LEVEL AND

OPTICAL PLUMMET IN TRIBRACH W/(QUICK RELEASE

MECHANISM (WILD HEERBRUGG MODEL T-2)

FSN 6675-543-1439

HEADQUARTERS, DEPARTMENT OF THE ARMY

A P R I L 1 9 6 6CHICAGO 10139A

TM 5 -6675-244 -15C 1

CHANGE HEADQUARTERSDEPARTMENT OF THE ARMY

No. 1 WASHINGTON, D. C., 18 April 1973

Organizational, Direct Support and General Support

and Depot Maintenance Manual

Including Repair Parts and Special Tool Lists

TARGET SET, SURVEYING: CIRCULAR LEVEL

AND OPTICAL PLUMMET IN TRIBRACH W/QUICK RELEASE

MECHANISM (WILD HEERBRUGG MODEL T-2)

FSN 6675-543-1439

TM 5-6675-244-15, 12 April 1966, is changed asfollows:

Page 27. Appendix II is deleted.

By Order of the Secretary of the Army:

Official:VERNE L. BOWERSMajor General, United States ArmyThe Adjutant General

CREIGHTON W. ABRAMSGeneral, United States ArmyChief of Staff

Distribution:

To be distributed in accordance with DA Form 12-25A (qty rqr block No. 174) Organizational Maintenance re-quirements for Surveying Equipment.

U.S. GOVERNMENT PRINTING OFFICE: 1973-769619/624

TM 5-6675-244-15

T ECHNICAL M A N U A L

No. 5-6675-244-15

ParagraphCHAPTER 1.

Section I.

II.

CHAPTER 2.Section I.

II.

III.

CHAPTER 3.

Section I.

II.

III.

AGO 10139A

H E A D Q U A R T E R SD E P A R T M E N T O F T H E A R M YW ASHINGTON , D. C., 12 April 1 9 6 6

ORGANIZATIONAL, DS, GS, AND DEPOT

MAINTENANCE MANUAL INCLUDING

REPAIR PARTS SPECIAL TOOL LISTS

TARGET SET, SURVEYING: CIRCULAR LEVEL ANDOPTICAL PLUMMET IN TRIBRACH W/QUICK RELEASE

MECHANISM (WILD HEERBRUGG MODEL T-2)FSN 6675-543-1439

INTRODUCTIONGeneralScope --------------------------------------------------------------------------------------------------------Record and report forms------------------------------------------------------------------------------Description and DataDescription --------------------------------------------------------------------------------------------------Identification and tabulated data -----------------------------------------------------------------Difference in models ----------------------------------------------------------------------------------

INSTALLATION AND OPERATION INSTRUCTIONSService upon receipt of equipmentUnpacking the equipment --------------------------------------------------------------------------Inspecting and servicing equipment------------------------------------------------------------Installation of separately packed components-------------------------------------------------Installation or setting-up instructions --------------------------------------------------------

Controls and instrumentsGeneral ---------------------------------------------------------------------------------------------------------Controls and instruments--------------------------------------------------------------------------

Operation of equipmentGeneral ---------------------------------------------------------------------------------------------------------Centering with optical plummet ------------------------------------------------------------------Centering below appex mark --------------------------------------------------------------------------Surveying target set operation -----------------------------------------------------------------------

OPERATOR AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS

Operator and organizational maintenance tools and equipmentSpecial tools and equipment ---------------------------------------------------------------------------Basic issue tools and equipment ---------------------------------------------------------------------Organizational maintenance repair parts ----------------------------------------------------

Operator’s maintenanceGeneral ---------------------------------------------------------------------------------------------------------Lamp ------------------------------------------------------------------------------------------------------------

TroubleshootingGeneral ---------------------------------------------------------------------------------------------------------No illumination on targetTarget set frame does not

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -seat properly on tribrach --------------------------------------

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Paragraph

Section IV.

V.

VI.

CHAPTER 4.

Section I.

II.

CHAPTER 5.Section I.

II.

III.

IV.

Target set carrying caseGeneral _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Carrying case_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Tribrach assemblyGeneral _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Tribrach assembly _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Illumination assembly and reflectorGeneral _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Illumination assembly _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Reflector _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

DIRECT AND GENERAL SUPPORT AND DEPOT MAINTENANCEINSTRUCTIONS

GeneralScope _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Record and report forms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Description and dataDescription _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Tabulated data _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

GENERAL MAINTENANCE INSTRUCTIONSSpecial tools and equipmentSpecial tools and equipment _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Direct and general support and depot maintenance repair parts _ _ _ _ _ _ _ _ _Specially designed tools and equipment _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _TroubleshootingGeneral _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Leveling screws too tight or too loose _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Circular level bubble does not stay in center _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Target level bubble does not stay in center _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Tribrach assembly repair instructionsGeneral _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Base plate assembly _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Leveling screws _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Optical plumbing objective assembly, plummet eyepiece assembly,

and reticle assembly _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Circular level _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Tribrach base _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Target assembly repair instructionsGeneral _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Target frame _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Target level _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Target base _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _Base sleeve _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Bracket _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

APPENDIX I. REFERENCES _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

2425

2627

282930

3132

3334

353637

38394041

424344

454647

484950515253

_ _

II. BASIC ISSUE ITEMS LIST _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

III. MAINTENANCE ALLOCATION CHART _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

IV. ORGANIZATIONAL, DIRECT AND GENERAL SUPPORT AND DEPOTMAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST _ _ _ _ _ _ _ _ _ _ _ _ _

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2 AGO 10189A

CHAPTER 1

INTRODUCTION

1. Scope

a. Theseuse of the

Section I.

instructions are published for thepersonnel to whom the surveying

target set is issued. Chapters 1 through 3 pro-vide information on the operation, preventivemaintenance services, and organizational main-tenance of the equipment. Chapters 4 and 5provide information for direct and generalsupport and depot maintenance. Also includedare descriptions of the main units and theirfunctions in relationship to other components.

b. Appendix I contains a list of publicationsapplicable to this manual. Appendix II containsthe basic issue items authorized for the initialoperation. Appendix III contains the mainte-nance allocation chart. The organizational,direct and general support and depot mainte-nance repair parts and special tool lists arelisted in appendix IV of this manual.

c. Numbers in parentheses on illustrationsindicated quantity.

GENERAL

d. The direct reporting by the individualuser of errors, omissions, and recommenda-tions for improving this manual is authorizedand encouraged. DA Form 2028 (RecommendedChanges to DA Publications) will be used forreporting these improvement recommendations.This form will be completed using pencil, pen,or typewriter and forwarded direct to Com-manding General, U.S. Army Mobility Equip-ment Center, ATTN: SMOME-MPD, 4300Goodfellow Boulevard, St. Louis, Mo. 63120

e. Report all equipment improvement recom-mendations as prescribed by TM

2. Record and Report Forms

For record and report formsthe operator and organizationalrefer to TM 38-750.

Note. Applicable forms, excluding

38-750.

applicable tomaintenance,

Standard Form46 which is carried by the operator, will be keptin a canvas bag mounted on the equipment.

Section II. DESCRIPTION AND DATA

3. Description

a. General. The Wild Heerbrugg Model T-2Surveying Target Set (figs. 1 and 2) isdesigned to eliminate centering errors and toincrease accuracy in traversing. The equipmentconsists of two tribrachs, two targets, twoillumination assemblies and two reflectors. Thetarget set is used with a tripod and battery bothof which normally are supplied with the T2-63MIL, T-2-56-C-MIL, or T-2-56-M-MILtheodolites.

b. Tribrach. The tribrach is connected to thetarget or theodolite by means of a coupling

AGO 10139A

device which consists of three slanted slottedfeet on the target and three grip holders on thetribrach. These engage in the slots when thetarget is mounted; the lockplate lever at thetribrach’s periphery is shifted to the left untilit is locked in position by means of a notch. Onpressing the lock plate lever downwards andthen to the right, the target may be removedand replaced by a theodolite or subtense barand the vertical axis will be automaticallycentered.

c. Target. The target consists of a base with3 feet for clamping to the tribrach, a vertical

3

Figure 1. Surveying target set, front view,with shipping dimensions.

4 AGO 10139A

Figure 2. Surveying target set, rear view,

AGO 10139A 5

column, a target level and the target patternwhich includes a centering mark.

d. Illumination Assembly and Reflector. Theillumination assembly is used for night workand consists of a lamp and cable. This assemblyis attached to a reflector mounted behind thetarget to give diffused illumination. The illumi-nation assembly is powered by the battery casewhich is attached to the tripod.

4. Identification and Tabulated Data

a. Identification. The surveying target sethas no identification plates. The tabulated datafor the surveying target set can be found intabulated data (b below).

b. Tabulated Data.(1) Genera l .

Manufacturer _ _ _ _ _ _ _ _ _ _Wild Heerbrugg, Ltd.Model _ _ _ _ _ _ _ _ _ _ _ _ _ _ _T-2Contract No. _ _ _ _ _ _ _ _DA-11-184-AMC-504 (T)

(2) Dimensions and weight.Length _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _12¼ in. (inch)Width _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 11 in.Height _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 6¼ in.Weight_ _ _ _ _ _ _ _ _ _ _ _ _ _ 12½ lb (pound)

5. Difference in Models

This manual covers the Surveying TargetSet, Wild Heerbrugg Model T-2 only. Noknown unit differences exist for the modelcovered by this manual.

6 AGO 10139A

CHAPTER 2

INSTALLATION AND OPERATION INSTRUCTIONS

Section I. SERVICE UPON

6. Unpacking the Equipmenta. Remove the tape securing the packing

carton.b. Remove the packing carton from the

carrying case.c. Unlock the carrying case and remove the

surveying target set.

7. Inspecting and Servicing Equipmenta. Inspect the entire unit for loose or missing

mounting hardware.b. Check the equipment against the packing

list and make sure all items are with the unit.c. Inspect the entire unit to make sure no

damage was incurred during shipment.

Section II. CONTROLS

10. GeneraIThis section describes, locates, illustrates,

and furnishes the operator sufficient informat-ion about the various controls for properoperation of the surveying target set.

RECEIPT OF EQUIPMENT

d. Correct all deficiencies or report to organi-zational maintenance.

8. Installation of Separately PackedComponents

There are no separately packed componentswith the surveying target set.

9. Installation or Setting-up Instructions

a. Mount the tribrach onto the tripod issuedwith the theodolite.

b. Mount the target onto the tribrach.

c. Center the target precisely over thestation.

AND INSTRUMENTS

11. Controls and Instruments

Refer to figure 3 for the purpose and locationof all controls and instruments.

AGO 10139A 7

Figure 3. Controls and instruments.

8 AGO 10139A

Section Ill. OPERATION OF EQUIPMENT

12. General

a. The instructions in this section are pub-lished for the information and guidance of thepersonnel responsible for the operation of thesurveying target set.

b. The operator must know how to performevery operation of which the surveying targetset is capable. This section gives instructionon centering the optical plummet, centeringbelow apex mark, checking the optical plummetand checking the target. Since nearly every jobpresents a different problem, the operator mayhave to vary given procedures to fit the indi-vidual job.

13. Centering With Optical Plummet

a. The eyepiece of the optical plummet (fig.3) must be turned until its plumbing markappears in focus. At the same time the stationmark on the ground will be seen, over whichthe instrument must be centered.

b. Loosen the fixing screw of the tripodslightly to allow the tribrach to be shifted untilthe ground mark appears in the center of theplumbing mark.

c. During the shifting, the bubble in the cir-cular level must be maintained exactly in thecenter.

d. Tighten the fixing screw.e. Center the target level. Then turn the

target through 90° and center the level bubblewith the third leveling screw. Repeat this pro-cedure until the bubble remains centralthroughout a 360° rotation of the target. Thebubble should now be centered in any position.If not, adjust the circular level.

14. Centering Below apex Mark

In galleries, the station points are oftenmarked by hooks cemented in the roof. In thiscase, fix a plumb line on the hook, so that thepoint of the plumb will be just at the height ofthe upper center mark (fig. 12) of the target.Shift the target on the tripod until its markis vertically below the plumb point when the

bubble of the circular level is centered. Thenlevel the target with reference to the targetlevel (para 13e).

15. Surveying Target Set Operation

a. Setting Up Tripod. For angular measure-ments, the instruments must be set up over apoint of the terrain which has been determinedpreviously. The plug-in sleeve of the plumb lineis plugged into the central fixing screw frombelow and secured by a quarter turn to theright. The tripod is then set up so that theplumb-bob, which hangs from the middle ofthe central opening, points to the station pointfrom within ½ inch, and the tripod’s plate isapproximately horizontal. To achieve this, theleg, whose turning axis at the tripod plate isinclined most, must be displaced laterally. Anyother method will affect the centering. The legpoints are set firmly into the soil, with carebeing taken to maintain the centering within½ to 1 inch. Now the plumb-bob may be re-moved if the final centering is to be doneoptically. Otherwise in calm weather the plumb-bob may be used on its own.

b. Securing Base Plate of Tribrach. Thetribrach itself is located on a star shaped baseplate, where the three leveling screws (fig. 4)are kept fast by a rotatable spring plate. Thespring plate is normally held in position frombelow by means of a lock screw. Withdrawingthis screw allows the spring plate to be rotateda few degrees. The base plate is thus releasedand can be separated from the tribrach. Fornormal use, the spring plate should always besecured to prevent the tribrach from fallingout.

c. Fixing and Leveling the Tribrach. Thetribrach is fixed to the tripod with the centralfixing screw. The circular level bubble is cen-tered by turning the leveling screws.

d. Fixing the Target. ‘Turn the lock platelevel (fig. 4) towards the right. Insert the feetof the target into the corresponding holes ofthe tribrach and turn the lever firmly towardsthe left until it snaps over the clutch and holdsthe target fast.

AGO 10139A 9

10

Figure 4. Surveying target set operating instructions.

AGO 10139A

CHAPTER 3

OPERATOR AND ORGANIZATIONALMAINTENANCE INSTRUCTIONS

Section I. OPERATOR AND ORGANIZATIONAL MAINTENANCE TOOLS AND EQUIPMENT

16. Special Tools and Equipment the basic issue item list, appendix II of thisNo special tools or equipment are required by manual.

the operator and organizational maintenancepersonnel to perform maintenance on the 18. Organizational Maintenance Repairsurveying target set. Parts

17. Basic Issue Tools and Equipment Organizational maintenance repair parts are

Tools and repair parts issued with or author- listed and illustrated in appendix IV of thisized for the surveying target set are listed in manual.

Section Il. OPERATORS MAINTENANCE

19. General

This section describes maintenance functionswhich the operator must perform on compo-nents of the surveying target set. The onlymaintenance function which is the operator’sresponsibility is replacement of the incandes-cent lamp.

20. Lamp

a. Removal. Refer to figure 5 and remove thelamp.

b. Cleaning and Inspection.(1) Clean the lamp with a clean cloth.(2) Inspect for cracks, breaks, and a

burned-out condition.(3) Replace a defective lamp.

c. Installation. Refer to figure 5 and installthe lamp.

AGO 10139A

Figure 5. Lamp, removal and installation.

11

Section Ill. TROUBLESHOOTING

21. General list of probable causes of the trouble. The

This section contains information useful inpossible remedy recommended is describedopposite the probable cause. Any trouble

diagnosing and correcting unsatisfactory oper- beyond the scope of organizational mainte-ation or failure of the surveying target set. nance will be reported to direct support main-Each trouble symptom stated is followed by a tenance.

22. No Illumination on TargetProbable cause Possible remedy

Incandescent lamp defective _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Replace lamp (para 20).

23. Target Set Frame Does Not Seat Properly on TribrachProbable cause Possible remedy

Tribrach assembly defective _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Replace tribrach assembly (para 27).

Section IV. TARGET SET CARRYING CASE

24. General the spring lock (7), and the lock assembly

The carrying case provides a convenient (3).means for carrying the target set in the field, (1)and serves as a dustproof and moistureproofcontainer for the set when it is in storage. Thissection contains maintenance functions whichorganizational maintenance personnel must (2)perform on the carrying case.

25. Carrying Case

Removal. Refer to figure 6 and removea defective handle, spring lock, or lockassembly.Installation. Refer to figure 6 andinstall a serviceable handle, springlock, or lock assembly.

a. Repair. The only components of the case b. Replace. Replace a carrying case damagedthat can be replaced are the handle (9, fig. 6) beyond repair with a serviceable case.

1 Screw 5 Nut 9 Handle2 Screw 6 Case 10 Washer3 Lock assembly 7 Spring lock 11 Screw4 Washer 8 Screw 12 Nut

Figure 6. Target set carrying case, removal and installation.

12 AGO 10139A

Figure 6 - Continued.

AGO 10139A 13

Section V. TRIBRACH ASSEMBLY

26. GeneralThe tribrach assembly, on which the target

assembly is mounted, consists of the tribrachassembly and base plate assembly. The tribrachassembly enables the operator quickly andaccurately to secure the target set to, andremove it from, the preleveled base attached tothe tripod head. This section contains mainte-nance functions which organizational ‘mainte-nance personnel must perform on the tribrachassembly.

27. Tribrach Assemblya. Removal. Refer to figure 4 and remove the

tribrach assembly as follows.

(1) Press the lock plate lever downwardand to the right, and remove thetarget assembly from the tribrachassembly.

(2) Unscrew and remove the tribrachassembly from the tripod central fix-ing screw.

b. Replace. Replace a defective tribrach as-sembly with a serviceable one.

c. Installation. Reverse the procedures de-scribed in a above.

Section VI. ILLUMINATION ASSEMBLY AND REFLECTOR

28. General 29. Illumination Assembly

The illumination assembly consists of a cable, a. Repair. Replace a defective lamp ( paralamp housing, incandescent lamp, male plug, 20).cable sleeve, and lamp socket. The reflector b. Replacement. Replace a defective illumi-(fig. 5) is square shaped and made of pressed nation assembly with a serviceable assembly.

steel. This section contains maintenance func- 30. Reflectortions which organizational maintenance person- a. Repair. Repaint worn spots.nel must perform on the illumination assembly b. Replacement. Replace a defective reflec-and the reflector. tor with a serviceable one.

14 AGO 10139A

CHAPTER

DIRECT AND GENERALDEPOT MAINTENANCE

4

SUPPORT ANDINSTRUCTIONS

Section I. GENERAL

31. Scope

a. These instructions are published for theuse of direct and general support and depotmaintenance personnel maintaining the survey-ing target set. They provide information on themaintenance of the equipment that is beyondthe scope of tools, equipment, personnel, orsupplies normally available to organizationalmaintenance.

b. Report all equipment improvement recom-mendations as prescribed by TM 38-750.

32. Record and Report FormsFor record and report forms applicable to

direct and general support and depot mainte-nance, refer to TM 38-750.

Note. Applicable forms, excluding Standard Form46 which is carried by the operator, will be keptin a canvas bag mounted on the equipment.

Section Il. DESCRIPTION AND DATA

33. Description b. Time Standards. Table 1 lists the number

For a complete description of the surveyingof man-hours required under normal conditionsfor various operations in the maintenance and

target set, refer to paragraph 3. repair of the surveying target set. The man-hours listed are not intended to be rigid

34. Tabulated Data standards. Under adverse conditions, thea. General. Tabulated data for the surveying operations will take longer; but under ideal

target for direct and general support and depot conditions with highly-skilled mechanics, most

maintenance is not required.of the operations can be accomplished in con-siderably less time.

Table 1. Time Standards

Removal and replace Hours18 BODY, CAB, HOOD AND HULL

1808 Carrying Cases:Case, carrying_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 0.2

67 PRECISION INSTRUMENTS AND SYSTEMS6700 Target Set:

Tribrach assembly _ _ _ _ _ _ _ _ _ _ _ _0.6(includes leveling)

6702 Optics:Objective assembly, tribrach _ _ _ _ _ _0.6Target frame assembly

(includes alinement) _ _ _ _ _ _ _ _ _ _ _0.6Plummet eyepiece assembly

(includes removing and installa-tion of tribrach and lock plate) 1.6

(includes adjustment)Reticle assembly, tribrach _ _ _ _ _ _ _0.3

AGO 10139A

Removal and replace Hours6703 Mechanical, Structural, and Precision

Parts:Base assembly, target

(with tribrach removed)_ _ _ _ _ _ 0.3

6705 Lamps:Lamp _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _0.1

6713 Miscellaneous Wiring and Fittings:Illumination assembly _ _ _ _ _ _ _ _ _ _ 0.2Cable assembly, extension _ _ _ _ _ _ _ _ _0.1

6718 Level:Level assembly, circular

(with tribrach and base plateremoved) _ _ _ _ _ _ _ _ _ _ _ _ _ _0.2

Level assembly, horizontal _ _ _ _ _ _ _ _ _ 0.3

15

CHAPTER 5

GENERAL MAINTENANCE INSTRUCTIONS

Section I. SPECIAL TOOLS AND EQUIPMENT

35. Special Tools and Equipment

No special tools or equipment are required by direct and general support and depot main-tenance personnel to perform maintenance on the surveying target set.

36. Direct and GeneraI Support and Depot Maintenance Repair Parts

Direct and general support and depot maintenance repair parts and special tool listslisted and illustrated in appendix IV.

37. Specially Designed Tools and Equipment

No specially designed tools or equipment are requireddepot maintenance personnel to perform maintenance on

by direct and general supportthe surveying target set.

Section Il. TROUBLESHOOTING

are

and

38. General and its components. Each trouble symptom

This section provides information useful instated is followed by a list of probable causesof the trouble. The possible remedy recom-

diagnosing and correcting unsatisfactory oper- mended is described opposite the probableation or failure of the surveying target set cause.

39. Leveling Screws Too Tight or Too LooseProbable cause Possible remedy

Leveling screws worn _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Replace leveling screws (para 44)Leveling screws out of adjustment _ _ _ _ _ _ _ _ _ _ _ _ _Adjust leveling screws (para 44)

40. Circular Level Bubble Does Not Stay in CenterProbable cause Possible remedy

Circular level out of adjustment_ _ _ _ _ _ _ _ _ _ _Adjust circular level (para 46)Defective level _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Replace level (para 46)

41. Target Level Bubble Does Not Stay in CenterProbable cause Possible remedy

Circular level out of adjustment _ _ _ _ _ _ _ _ _ _ _ _ _Adjust circular level (para 46)Target level assembly out of adjustment _ _ _ _ _ _ _ _ _ _ Adjust target level assembly (para 50)Defective vial_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Replace vial (para 50)

16 AGO 10139A

Section III.

42. General

The tribrach assembly consists of the baseplate assembly, leveling screws, optical plumb-ing assembly, circular level and tribrach. Thebase plate provides a means for securing thetarget set to the tripod. Leveling is accom-plished by means of the leveling screws. Preciselocation of the target set over the station pointis verified by sighting through the opticalplummet eyepiece.

43. Base Plate Assemblya. Removal and Disassembly.

(1)

(2)

(3)

(4)

Remove the tribrach assembly fromthe tripod and target set (para 27).Loosen the lock screw (8, fig. 7) andpush the spring plate (3) clockwise asfar as possible.Lift the base plate assembly from thetribrach.Refer to figure 7 and disassemble thebase plate assembly.

b. Repair and Replacement. Remove burs andstraighten minor dents. Refinish and polishscratched or scored bearing surfaces. Replaceparts damaged beyond repair with serviceableparts.

c. Reassembly and Installation.(1)

(2)

(3)

(4)

Refer to figure 7 and reassemble thebase plate assembly.Position the base plate assembly onthe tribrach making sure the feet ofthe leveling screws engage the largerpart of the slots in the spring plate(3).Push the spring plate counterclock-wise until it engages the levelingscrew feet and tighten the lock screw(8).Install the tribrach assembly on thetripod and target set (para 27).

44. Leveling Screwsa. Removal and Disassembly.

(1) Remove the base plate assembly fromthe tribrach (para 43).

AGO 10139A

1 Setscrew 5 Screw, guide2 Nut 6 Nut3 Plate, spring 7 Bearing4 Plate, base 8 Screw, lock

Figure 7. Base plate assembly, disassemblyand reassembly.

(2) Refer to figure 8 and remove anddisassemble the leveling screw.

b. Repair. Straighten out minor bends anddents. File smooth all burs. Replace parts dam-aged beyond repair with serviceable parts.

c. Reassembly and Installation.(1) Refer to figure 8 and reassemble and

install the leveling screw.(2) Install the loose plate assembly (para

4 0 ) .

17

d. Adjustment. If the leveling screw doesnot turn smoothly, adjust the pressure byturning the adjusting screw (4, fig. 8).

45. Optical Plumbing Objective Assembly,Plummet Eyepiece Assembly, andReticle Assembly

a. Removal and Disassembly.(1) Remove the base plate assembly from

the tribrach (para 43).(2) Refer to figure 9 and remove and dis-

assemble the optical plumbing objec-tive, eyepiece, and reticle assemblies.

b. Repair. Straighten minor bends and re- 43) .

6

1234

678

18

MEC 6675-244-15/8

Setscrew, cover retaining

5Knob

CoverScrew, pointscrew retainingScrew, adjustingNut, leveling screw

Screw, levelingSetscrew, nut retaining

Figure 8. Leveling screw assembly,disassembly and reassembly.

move burs. Replace parts damaged beyondrepair with serviceable parts.

c. Reassemble and Installation.(1)

(2)

Refer to figure 9 and reassemble andinstall the optical plumbing objective,eyepiece, and reticle assemblies on thetribrach.Install the base plate assembly (para41).

46. Circular Levela. Removal and Disassembly.

(1) Remove the base plate assembly (para

(2) Refer to figure 10, callouts 1 through7, and remove and disassemble thecircular level.

b. Repair and Replacement. Remove all bursand straighten minor bends. Replace partsdamaged beyond repair with serviceable parts.

c. Reassembly and Installation.(1) Refer to figure 10, callouts 1 through

7, and reassemble and install thecircular level.

(2) Install the base plate assembly (para41).

d. Adjustment. If the level bubble is not cen-tered in the vial, the circular level is out ofadjustment. Tighten or loosen the three adjust-ing screws (7, fig. 10) to bringto center.

47. Tribrach Basea. Removal and Disassembly.

the level bubble

(1) Remove the base plate (para 43).(2) Remove the leveling screws (para 44).(3) Remove the optical plumbing assembly

(para 45).(4) Remove the circular level (para 46).(5) Refer to figure 10, callouts 8 through

17 and remove and disassemble thelock plate (8) from the tribrach base(17).

b. Repair and Replacement. Remove bursand straighten minor bends on the base.Replace parts damaged beyond repair withserviceable parts.

AGO 10139A

Lens assembly 14 CollarMount 15 TubeScrew, reticle adjusting 16 CollarHousing, spring 17 SetscrewScrew 18 Lens assemblySleeve 19 NutHousingReticle

20 Nut21 Screw

Setscrew, leveling 22 SetscrewSpring 23 Housing, prismPuffer 24 SetscrewBracket, mountingScrew

25 Prism26 Setscrew

Figure 9. Optical plumbing objective, plummet eyepiece, and reticle assemblies,., Y:, disassembly, reassembly, and installation.

19

Figure 10.

c. Reassembly and Installation. (3) Install the optical plumbing assembly(1) Refer to figure 10, callouts 8 through (para 43).

17, and reassemble and install the (4) Install the leveling screws (para 42).lock plate on the base. (5) Install the base plate (para 41).

(2) Install the circular level (para 44).

Section IV. TARGET ASSEMBLY REPAIR INSTRUCTIONS

48. General 49. Target FrameThe target assembly consists of a target a. Removal.

frame, a target level, a base with 3 feet for (1) Refer to paragraph 27 and remove theclamping to the tribrach, a base sleeve, and a target assembly from the tribrach.bracket.

20 AGO 10139A

(2) Refer to figure 11 and remove theframe from the target assembly.

b. Disassembly, Replacement, and Reassem-bly.

(1)

(2)

(3)

Refer to figure 12 and disassemblethe frame assembly.Replace defective parts with service-able parts.Refer to figure 12 and reassemblethe frame assembly.

c. Installation. Reverse the procedures in aabove.

50. Target Level

a. Removal. Refer to figure 13 and removethe level assembly from the target assembly.

b. Disassembly, Repair, and Reassembly,(1) Refer to figure 14 and disassemble

the level assembly.(2) Replace defective parts with service-

able parts.(3) Refer to figure 14 and reassemble the

level assembly.c. Installation. Refer to figure 13 and install

the level assembly on the bracket.d. Adjustment. If, after the circular level

has been adjusted ( para 46), the target levelbubble is far off center, the target level is outof adjustment. Tighten or loosen the adjust-ing screw (11, fig. 14) to bring the bubble tocenter.

51. Target Base

a. Removal.(1) Refer to paragraph 27 and remove

the target assembly from the tribrach.(2) Refer to figure 15 and remove the

base from the sleeve.b. Disassembly, Replacement, and Reassem-

bly.(1)

(2)

(3)

Refer to (13), (15), (16), and (17),figure 16 and disassemble the base.Replace defective parts with service-able ones.Refer to figure 16 and reassemble thebase.

c. Installation.above.

AGO 10139A

Reverse the procedures in a

Figure 11. Target frame, removal, and installation.

52. Base Sleevea. Removal.

(1) Remove the base (para 51).(2) Refer to figure 16, and remove the

setscrew (12).b. Disassembly, Replacement, and Reassem-

bly.

c.

53.

a.

(1) Remove the sleeve (8), spring (9),cover (10), and nut (11 ) from thebracket shaft.

(2) Replace defective parts with service-able parts.

(3) Refer to (8) through (11), figure 16and reassemble the sleeve.

Installation.(1) Refer to (12), figure 16 and install

the sleeve on the bracket shaft.(2) Install the base (para 51).

Bracket

Removal.(1) Remove the target frame (para 49).(2) Remove the target level assembly

(para 50).

21

1 Plate, cover2 Plate, glass3 Screw

4 Center 7 Screw5 Frame 8 Pivot6 Brace 9 Screw

Figure 12. Target frame, disassembly and reassembly.

2 2

Figure 13. Target level assembly,removal and installation.

23

Figure 14. Target level assembly,disassembly and reassembly.

Figure 15. Target base, removal and installation.

24

(3) Remove the target base (para 51).(4) Remove the sleeve (para 52).

b. Disassembly, Replacement, and Reassem-bly.

(1)

(2)

(3)

Refer to (2) through (7), (18) and(21), figure 16, and disassemble thebracket (6).Replace defective parts with service-able parts.Refer to (2) through (7), (18) and(21) and reassemble the bracket.

c. Installation.(1) Install the sleeve (para 52).(2) Install the target base (para 51).(3) Install the target level assembly (para

50).(4) Install the target frame (para 49).

AGO 10139A

Figure 16. Target assembly, disassembly and reassembly.

25

APPENDIX I

REFERENCES

1. Preventive Maintenance

TM 38-750 The Army Equipment Record Procedures.

2. Technical Manuals

TM 5-6675-205-15 Theodolite: Directional; 0.002 MIL Graduation; 5.9-in. Long Telescope;Detachable Tribrach; w/Accessories and Tripod (Wild HeerbruggModel T-2-56-C-MIL) FSN 6675-682-4635 (Wild Heerbrugg ModelT-2-56-M-MIL) FSN 6675-796-9439.

TM 5-6675-233-15 Theodolite: Directional; 0.002 MIL Graduation; 5.9-in. Long Telescope;Detachable Tribrach; w/Accessories and Tripod (Wild Heerbrugg ModelT2-63MIL) FSN 6675-983-8027.

26

APPENDIX II

BASIC ISSUE ITEMS LIST

Section

1. General

Section II lists the accessories, tools,publications required for maintenance

I. INTRODUCTION

b. Federal Stock Number. The Federal stock

and number will be shown in this column, and willbe used for requisitioning purposes.and

operation by the operator, initially issued with, c. Description.or authorized for the surveying target set. (l) The item name and a brief description

of the part are shown.2. Explanation of Columns Contained in (2) A five-digit Federal supply code for

Section II manufacturers and/or other supplya. Source Codes. The information provided in services is shown in parentheses

each column is as follows:(1)

(2)

(3)

Materiel. This column is left blank.For identification of agencies assignedsupply responsibility for parts refer

level authorized to use, stock, install,or manufacture the part is indicatedby the following code symbol:

O-Organizational Maintenance(4) Recoverability.

Note. When no code is shown in therecoverability column the part is consid-ered expendable.

followed by the manufacturer’s partnumber. This number will be usedfor requisitioning purposes when noFederal stock number is indicated inthe Federal stock number column.Example: (08645) 86453.

d. Unit of Issue. If no abbreviation is shownin this column, the unit of issue is “each”.

e. Quantity Authorized. This column lists thequantities of repair parts, accessories, tools, orpublications authorized for issue to the equip-ment operator or crew as required.

f. Quantity Issued with Equipment. This col-umn lists the quantities of repair parts, acces-sories, tools, or publications that are initiallyissued with each item of equipment.

g. Illustrations. This column is subdividedinto two columns which provide the followingin format ion :

(1)

(2)

Figure number. Provides the identify-ing number of the illustration.Item number. Provides the referencednumber for the parts shown in theillustration.

AGO 10139A 27

Source codes

6675-859-5936

Section Il. BASIC ISSUE ITEMS LIST

Descript ion

GROUP 31-BASIC ISSUE ITEMS,MANUFACTURER INSTALLED

3100-BASIC ISSUE ITEMS,MANUFACTURER OR DEPOT INSTALLEDDEPARTMENT OF THE ARMY OPERA-

TOR, ORGANIZATIONAL, DIRECT ANDGENERAL SUPPORT AND DEPOT MAIN-TENANCE AND REPAIR PARTS MAN-UAL TM 5-6675-244-15.

GROUP 32-BASIC ISSUE ITEMS,TROOP INSTALLED

3200-BASIC ISSUE ITEMS,TROOP INSTALLED OR AUTHORIZED

INCANDESCENT LAMP, ILLUMINATIONASSEMBLY (89905) HEG3-64.(Repair Parts Manual Group 6705)

2

4

28 AGO 10139A

APPENDIX Ill

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

1. Generala. Section I provides a general explanation

of all maintenance and repair functions author-ized at various maintenance levels.

b. Section II designates overall responsibilityfor the performance of maintenance operationson the identified end item or component. Theimplementation of the maintenance tasks uponthe end item or component will be consistentwith the assigned maintenance operations.

c. Section III lists the special tools and testequipment required for each maintenance oper-ation as referenced from section II.

d. Section IV contains supplemental instruc-tions, explanatory notes, and/or illustrationsrequired for a particular maintenance function.

2. Explanation of Columns in Section IIa. Functional Group Number. The functional

group is a numerical group set up on a func-tional basis. The applicable functional group-ing indexes (obtained from TB 750-93-1Functional Grouping Codes) are listed on theMAC in the appropriate numerical sequence.These indexes are normally set up in accord-ance with their function and proximity to eachother .

b. Component Assembly Nomenclature. Thiscolumn contains a brief description of thecomponents of each functional group.

c. Maintenance Operations and MaintenanceLevels. This column lists the various mainte-nance operations (A through J) and indicatesthe lowest maintenance level authorized toperform these operations.

The symbol designations for the variousmaintenance levels areas follows:

AGO 10139A

O/C - Operator or crewO - Organizational maintenanceF - Direct support maintenanceH - General support maintenanceD - Depot maintenance

The Maintenance Operations are defined asfollows:A-SERVICE: Operations required periodi-

cally to keep the item inproper operating condition,i.e., to clean, preserve, drain,paint, and replenish fuel,lubricants, hydraulic, and de-icing fluids, or compressedair supplies.

B—ADJUST: Regulate periodically to preventmalfunction. Adjustments willbe made commensurate withadjustment procedures andassociated equipment specifi-cations.

C-ALINE: Adjust two or more componentsof an electrical or mechanicalsystem so that their functionsare properly synchronized oradjusted.

D-CALIBRATE: Determine, check, or rectifythe graduation of an in-strument, weapon, orweapons system or com-ponents of a weapons sys-tem.

E-INSPECT: Verify serviceability and detectincipient electrical or me-chanical failure by closevisual examination.

F-TEST: Verify serviceability and detectincipient electrical or mechanicalfailure by measuring the mechan-

29

ical or electrical characteristicsof the item and comparing thosecharacteristics with authorizedstandards. Tests will be madecommensurate with test proce-dures and with calibrated toolsand/or test equipment referencedin the MAC.

G-REPLACE: Substitute serviceable compo-nents, assemblies and sub-assemblies for unserviceablecounterparts or remove andinstall the same item whenrequired for the perform-ance of other maintenanceoperations.

H-REPAIR: Restore to a serviceable condi-tion by replacing unservice-able parts or by any otheraction required using avail-able tools, equipment andskills-to include welding,grinding, riveting, straighten-ing and facing.

I-OVERHAUL: Restore an item to a com-pletely serviceable condi-tion (as prescribed byserviceability standardsdeveloped and published bythe commodity commands)by employing techniuqes of“Inspect and Repair Onlyas Necessary” (IROAN).Maximum use of diagnos-tic and test equipment iscombined with minimumdisassembly during over-haul. “Overhaul” may beassigned to any level ofmaintenance except organ-izational, provided thetime, tools, equipment, re-pair parts authorization,and technical skills areavailable at that level. Nor-mally, overhaul as appliedto end items, is limited todepot maintenance level.

J-REBUILD: Restore to a condition com-parable to new by disassem-bling to determine the condi-tion of each component partand reassembling using serv-iceable, rebuilt, or new as-semblies, subassemblies, andparts.

e. Reference Note. This column, subdividedinto columns K and L, is provided for refer-encing the SPECIAL TOOL AND TESTEQUIPMENT REQUIREMENTS (See III)and REMARKS ( Sec IV) that may be associ-ated with maintenance operations (Sec H).

3. Explanation of Columns in Section Ill

a. Reference Code. This column consists of anumber and a letter separated by a dash. Thenumber references the T and TE requirementscolumn on the MAC.

The letter represents the specific mainte-nance operation the item is to be used with.The letter is representative of columns Athrough Jon the MAC.

b. Maintenance Level. This column shows thelowest level of maintenance authorized to usethe special tool or test equipment.

c. Nomenclature. This column lists thename or identification of the tool or test equip-ment.

d. Tool Number. This column lists the man-ufacturer’s code and part number, or FederalStock Number, of tools and test equipment.

5. Explanation of Columns in Section IV

a. Reference Code. This column consists oftwo letters separated by a dash, both of whichare references to section H. The first letterreferences column L and the second letterreferences a maintenance operation, columnA through J.

b. Remarks. This column lists informationpertinent to the maintenance operation beingperformed, as indicated on the MAC sectionII.

3 0 AGO 10139A

NCE ALLOCATION CHART

181808

67

6700

6702

6703

6705

6713

6718

Section Il. MAINTENA

Component assembly nomenclature

BODY, CAB, HOOD AND HULLCarrying Caaes:

Case, target set ------------------

PRECISION INSTRUMENTS AND S,YS-TEMS, MECHANICAL ELECTRICAL,ELECTRONIC

Target Set:Tribriach assembly _______________Base plate assembly ______________

Optics:Objective assembly; tribrach ______Target frame assembly ____________Reticle assembly, tribrath ---------Plummet eyepiece assembly ________

Mechanical, Structural, and PrecisionParts:

Base, target assembly _____________Lamps:

Lamp ____________________________Miscellaneous Wiring and Fittings:

Illumination assembly _____________I.avels:

Level assembly, circular -----------Level assembly, horizontal _________

I bfaintenanceoperation

h.2m A.-;

$:.->$

CA

-—_ -- —__

I----

--- --——

---- -----

--- -— --

---

E ---

___.___]

I--- --——

1

— —B—

%5.“

2

—

-——

-—-

---

---

.——

—

c—

w>5<—

---

.-—

.-—--------

---

-------—

D E

f

.0 3~ n!43 .

--——

---- --—.

-—_— _—— —.

.—— —

--—-

.-— —

-— --

.- —- ----

-— . .

F G

2~

: 3M

--— 0

--- 0F

DHDD

- H

. 0

0

. HH

—H—

.!J

!

0

DF

DHDD

1

3

FI

Notereference

Section Ill. SPECIAL TOOL AND SPECIAL TEST EQUIPMENT REQUIREMENTSBef&eye Maint;:,ance

Nomenclature Tool No.

No special tools or test equipment required.

Section IV. REMARKSIta&lce

Remarks

No remarks required.

AGO lola9A 31

APPENDIX IV

ORGANIZATIONAL, DIRECT AND GENERAL SUPPORT ANDDEPOT MAINTENANCE REPAIR PARTS

AND SPECIAL TOOL LISTS

Section I. INTRODUCTION

1. General

a. This appendix lists repair parts and specialtools for organizational, direct and general sup-port, and depot maintenance. It indicates thequantity of repair parts required to be stockedby organizational maintenance as their pre-scribed load. It indicates the guide quantityfactors to be used for initial repair partsstockage by direct and general support, andrecommends quantities of repair parts fordepot maintenance. Information and data con-tained herein serve as requisitioning referencematerial, and as a guide to determine stockagequantities of repair parts.

b. Price information for stock-type repairparts may be obtained from applicable FederalSupply Catalogs and/or Supply ManagementData and Price List (ML) of the Departmentof Defense Supply agencies.

c. Repair parts lists are arranged as follows:(1)

(2)

(3)

Individual parts and major assembliesare listed alphabetically by item namewithin the functional groups.Assembly components and subassem-blies are indented and listed alpha-betically by item name under majorassemblies.Bulk material and parts peculiar withmore than one application are listedin functional groups 9501 and 9901respectively.

d. Allowances are based on 700 hours opera-tional per year.

2. Explanation of Repair Parts, Tools Lists,and Prescribed Load listing (Table 1).

a. Source Codes. This column is subdividedinto four columns. The titles and informationprovided in each column are as follows:

(1)

(2)

Materiel. This column is left blank.For identification of agencies assignedsupply responsibility for parts, referto appropriate Federal and Depart-ment of Army supply catalogs.Source. The selection status andsource of supply for each part areindicated by one of the following codesymbols:

(a)

(b)

(c)

P-applied to high-mortality repairparts which are stocked in or sup-plied from the Army supply sys-tem, and authorized for use at in-dicated maintenance categories.X1-applied to repair parts whichare not procured or stocked, therequirement for which will be sup-plied by use of next higher assem-bly or components.X2-applied to repair parts whichare not stocked. The indicatedmaintenance category requiringsuch repair parts will attempt toobtain them through cannibaliza-tion; if not obtainable throughcannibalization, such repair partswill be requisitioned with support-ing justification through normalsupply channels.

32 AGO 10139A

Note. Source coding is not shown oncommon hardware items known to bereadily available in Army supply chan-nels and through local procurement.

(3) Maintenance.(a)

(b)

The lowest maintenance level au-thorized to manufacture, assembly,and/or install the part is indicatedby one of the following codesymbols:

O-Organizational Mainte-nance

F-Direct Support Mainte-nance (DS)

H-General Support Mainte-nance (GS)

D-Depot MaintenanceThis column is left blank when com-ponents of kits or sets are listedthat are not applicable to the itemof equipment, or when an item issource coded Xl.

(4) Recoverability.Note. When no code is shown in the re-

coverability column the part is consideredexpendable.

b. Federal Stock Number. The Federal stocknumber will be shown in this columm and willbe used for requisitioning purposes.

c. Description.(1)

(2)

The item name and a brief descriptionof the part are shown.A five-digit Federal supply code formanufacturers and/or other supplyserve is shown in parentheses, fol-lowed by the manufacturer’s partnumber. This number will be used forrequisitioning purposes when no Fed-eral stock number is indicated in theFederal stock number column.Example: (08645) 86453.

d. Unit of Issue. If no abbreviation is shownin this column, the unit of issue is “each.”

e. Quantity Incorporated in Unit. The actualnumber of parts used in the application indi-cated is shown in this column.

f. 15-Day Organizational Maintenance Allow-ance. Shown for each repair part is either aquantity or an asterisk allocation which indi-cates the following:

(1)

(2)

(3)

A guide quantity factor is shown foreach repair part authorized to bestocked by organizational mainte-nance. This quantity is based on pastexperience with similar items and thelatest mortality data for 700 hoursoperation per year. It is the averagequantity required to provide one pre-scribed load for 1-5 and/or 6-10items of equipment for a 15-dayperiod under average combat condi-tions.

Note. Combat essential items which mustbe stocked or on order at organizationalmaintenance at all times, regardless of de-mand, will be identified in the allowancecolumn by a quantity in parentheses.The quantity of repair parts author-ized for stockage in accordance withthe number of prescribed loads by themajor commander are determined byusing table 1.Table 1 is a consolidation of itemsquantitatively allocated in this manual.Quantities listed are for one pre-scribed load for a 15-day period. Aminimum stockage sufficient to repairone item and/or assembly is author-ized (e.g., if 3 belts are required, then3 belts are allocated as the minimumstockage). This quantity will be indi-cated in the minimum stockage au-thorization column.

Table 1. Prescribed Load Listing, ,

AGO 10139A 33

(4)

(5)

(6)

(7)

Units and organizations authorizedmore than one prescribed load willmultiply the quantity listed in theappropriate end item density spreadcolumn of 1-5 or 6-10 by the numberof prescribed loads.When more than 10 equipments re-quire support, multiply the quantitylisted in the 6-10 column by the num-ber of equipments and the number ofauthorized prescribed loads, divide by10, and round to the nearest wholenumber.Example: If the quantity listed in the6-10 column is 4, the number of equip-ments is 17, and the number of au-thorized prescribed loads is 1, thefollowing formula would be used:

4 × 17 × 1÷ 10 = 6.8The resulting fraction is 0.8 thereforethe authorized stockage is 7.Example: If the quantity listed in the6-10 column is 4, the number of equip-ments is 17, and the number of au-thorized prescribed loads is 3, thefollowing formula. would be used:

4 × 17 × 3 ÷ 10 = 20.4The resulting fraction is 0.4; there-fore the authorized stockage is 20.

Note. An exception is made for thoseunits and organizations required to haveon hand, boxed or packaged prescribedload(s) pursuant to a special mission as-signment. Such prescribed load(s) will becomputed or selected separately from quan-tities authorized for stockage at permanentstation.

Repair parts required to performorganizational maintenance, which arenot authorized for stockage are iden-tified by an asterisk, and are to berequisitioned for immediate use only.Subsequent changes to allowances willbe limited as follows:

(a)

(b)

34

No decrease in the stated quantityof combat essential items is au-thorized.No change in the range of items isauthorized. If exception to the pre-scribed load listing or revision toallowance is considered necessary, a

(c)

recommendation should be for-warded to the U.S. Army MobilityEquipment Center (para 6).Decreases in the stated quantity ofitems other than combat essentialitems are authorized to a minimumquantity sufficient to repair oneitem and/or assembly and increasesin the stated quantity are author-ized for all items when justified bydemand and usage experience.Detailed procedures for performingthese adjustments are prescribed inAR 735-35.

g. Guide Quantities Per 100 Equipments.Shown for each repair part applicable directand general support, and/or depot maintenanceis either an allowance factor or an asteriskallocation which indicates the following:

(1)

(2)

A guide quantity factor is shown foreach part authorized to be stocked bydirect and general support mainte-nance and supply support activities,and the number of repair partsrecommended for depot maintenance.This factor is based on the latestmortality data for 700 hours operationper year and is the average quantityrequired by the various maintenanceactivities to provide maintenance andsupply support for 100 items of equip-ment for a 15-day period under aver-age combat conditions.The quantities of repair parts author-ized for stockage are determined usingthe following mathematical formula:

Quantity of equipment to be sup-ported, multiplied by the listedallowance factor, divided by 100.

Fractions derived from the use of theabove formula will be rounded towhole numbers as follows: If the re-sult is 1 or more and includes a frac-tion that is 0.5 or more, the quantityis rounded to the next higher number.Example: If the number of equipmentsupported is 30 and the allowancefactor for 100 equipments is 5, thefollowing formula would be used:

30 × 5 ÷ 100 = 1.5

AGO 10139A

The resulting fraction is 0.5; there-fore, the stockage is 2. If the result is1 or more and includes a fraction ofless than 0.5, the quantity is roundedto the next lower number. When thecomputed result is less than 0.5, noquantity is authorized for direct andgeneral support, and depot mainte-nance. However, if the item is combatessential, a quantity of 1 is authorized.Example: If the number of equipmentsupported is 30 and the allowancefactor for 100 equipments is 28, thefollowing formula would be used:

30 × 28 ÷ 100 = 8.4The resulting fraction is less than 0.5;therefore, the stockage is 8.

(3) In the guide quantity columns fordirect and general support mainte-nance, additional repair parts author-ized for use but not for initial stock-age, are listed without a guidequantity factor. These items are iden-tified by an asterisk and maybe addedto or deleted from stock when recordeddemand experience justifies a changein stockage objective.

(4) Parts that may be required for depotmaintenance, in addition to thoseallocated, are identified by a asterisk.These parts are to be requisitioned,when required, if not obtainable fromreclamation, fabrication, or localprocurement.

(5) Combat essential items of a criticalnature which must be stocked at directand general support maintenance atall times, regardless of demand areidentified in the allowance column byinclosing the allowance factor inparentheses.

h. Direct and General Support Maintenance15-Day Level.

(1) Direct support (DS). This columnlists the initial guide quantity allow-ance factors of repair parts author-ized for initial stockage by directsupport maintenance activities to pro-vide direct support maintenance forMobility Command equipment and to

AGO 10139A

provide organizational maintenancerepair parts for supported units for a15-day period. Additional repair partsidentified by an asterisk are explainedin g above. Upon establishment of sup-ply records, recorded demand experi-ence will be used to compute stockageobjectives on authorized repair parts.Review of stockage objectives will beperformed in the time cycle prescribedby major commanders.

(2) General support (GS). This columnlists initial guide quantity allocationfactors of repair parts authorized forinitial stockage by general supportmaintenance activities to providegeneral support maintenance for Mo-bility Command equipment for a 15-day period. Additional repair partsidentified by an asterisk are explainedin g above. Upon establishment of sup-ply records, recorded demand experi-ence will be used to compute stockageobjectives on authorized repair parts.Review of the stockage objectiveswill be performed in the time cycleprescribed by major commanders.

(3) Units with TOE capability of per-forming partial or complete Directand General Suport maintenance fororganic Mobility Command equipment.Units with the TOE capability ofperforming partial or complete directand general support maintenance fororganic Mobility Command equipmentwill be authorized to stock direct and/or general support repair parts onlywhen specific agreements are madebetween the commander of the desig-nated parts supply activity, normallyDSU (Direct Support Units) and us-ing unit. Parts so furnished are inaddition to the prescribed bad andwill be adjusted as demands indicate.

(4) Units with TOE Mission to providemaintenance for Mobility Commandequipment of supported units. Unitsorganized under TOE’s with theassigned mission to provide direct andgeneral support maintenance for

35

Mobility Command equipment of sup-ported units are authorized to stockdirect and general support repairparts. These repair parts will beissued from the appropriate partssupply activity (parts depot and/orDSU). Such stockage is in additionto the prescribed lewd and will beadjusted as demands indicate.

i. Depot Maintenance. This column lists thequantity of repair parts recommended for depotmaintenance shops (non-TOE) to provide depotmaintenance for 100 equipments. Additionalrepair parts are alocated by an asterisk, forimmediate use only. Explanation of the aster-isk allowance is contained in g above.

j. Illustrations. This column is subdividedinto two columns as follows:

(1)

(2)

Figure number. Indicates the numberof-the illustration in which the part isshown.Item number. Indicates the referencenumber used to point out the part inthe illustration.

3. Abbreviationsid _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ inside diameterin._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ inch(es)lb _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ pound(s)lg _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _long (length)mtg_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ mounting(s)No. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _numberod_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _outside diameterthd_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ thread(s) (ed)thk_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _thick(ness)

4. Federal Supply Code for Manufacturers89905 _ _ _ _ _ _Wild Heerbrugg Instruments, Inc.

36 AGO 10139A

15

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AGO 10189A

15

W&E GUIDE llTV(S) PER MAJ [OUIPS ILLUST

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1 Screw 5 Nut 9 Handle2 Screw 6 Case 10 Washer3 Lock assembly 7 Spring, lock4 Washer

11 Screw8 Screw 12 Nut

Figure 17. Carrying Case.

40 AGO 10139A

AGO 10139A

Figure 17 - Continued.

41

Figure 18. Tribrach base plate.

42 AGO 10139A

Figure 19. Tribrach.

AGO 10139A 4 3

44

1 Setscrew 5 Nut2 Cover 6 Knob3 Screw 7 Screw4 Screw 8 Setscrew

Figure 20. Leveling screw.

AGO 10139A

10 Spring 19 Nut11 Puffer 20 Nut12 Bracket 21 Screw13 Screw 22 Setscrew14 Collar 23 Housing15 Tube 24 Setscrew16 Collar 25 Prism17 Setscrew 26 Setscrew18 Lens assembly

Figure 21. Objective, eyepiece and reticle,and optical plumbing.

AGO 10139A 45

1 Plate2 Plate3 Screw

4 Center5 Frame6 Brace

Figure 22. Target frame.

7 Screw8 Pivet9 Screw

46 AGO 10139A

Figure 23. Target.

47

1 Reflector 2 L a m p 3 Illumination assembly

Figure 24. Illumination assembly and reflector.

4 8 AGO 10139A

5 Cap 9 Spring6 Bearing 10 Washer7 Setscrew 11 Screw8 Screw

Figure 25. Target level assembly, exploded view.

4 9

By Order of the Secretary of the Army:

Official:J. C. LAMBERT,Major General, United States Army,The Adjutant General.

Distribution:Active Army:

USASA (2)ACSI (1)DCSLOG (1)CNGB (1)TSG (1)CofEngrs (3)CO-E (1)Dir of Trans (1)CofSptS (1)USAMB (1)USACDCARTYA (2)USACDCARMA (2)USAIB (2)USA AD Bd (2)USAAESWBD (2)USA Avn Bd (2)USCONARC (3)OS Maj Comd (5) except

USASETAF (2)USARJ (1)

USAMOCOM (2)USASMC (1)MDW (1)Armies (2)Corps (2)USAC (1)Div (2)Engr Bde (1)USMA (2)

HAROLD K. JOHNSON,General, United States Army,Chief of Staff.

Svc Colleges (2)Br Svc Sch (2)USA Engr RD Lab (3)USACDCEC (10)Gen Dep (10)Engr Dep (10)Army Dep (2) except

Tobyhanna (3)USA Tml Cored (2)Army Tml (1)Div Engr (2)Engr Dist (2)USAMEC (46)USAECFB (5)USAREUR Eng Proc Cen (2)USAREUR Engr Sup Cen Agcy (10)Engr Fld Maint Shops (2)Ft Knox Fld Maint Shops (10)Fld Comd, DASA (8)AMS (3)USAREURCOMZ (2)MAAG (1)Units org under fol TOE:

5-48 (2)5-237 (5)5-262 (5)5-267 (1)5-278 (5)5-279 (2)

NG: State AG (3).USAR: Same as active Army except allowance is one copy to each unit.For explanation of abbreviations used, see AR 320-50.

U.S. Government Printing Office: 1966-216-733/10139A

50 AGO 10139A

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