AC-S-WD,WD45

AAll ll iiss CChhaallmmeerrssService Manual

WD, WD-45WD-45 Diesel

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF ALLIS CHALMERS OR IT’S SUCCESSORS. ALLIS CHALMERS AND IT’S SUCCESSORS

ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

Serv

ice

Man

ual

WD Starting Serial Numbers 1948......................................7-9249 1949..............................9250-35444 1950............................35445-72327 1951..........................72328-105181 1952........................105182-131242 1953........................131243-146606 WD-45 Starting Serial Numbers 1953........................146607-160385 1954........................160386-190992 1955........................190993-217991 1956........................217992-230294 1957........................230295-236958 Paint Codes Persian Orange #1 (1929-1960) PPG.......................................DAR 60080 Martin-Senour ..........................90R-3723 Tisco..............................................TP280

DEALER'S SERVICE MANUAL

ALLIS-CHALMERS MODEL

WD & WD-4S

TRACTOR

Allis-Chalmers Mfg. Co. . TRACTOR DIVISION MILWAUKEE, WISCONSIN

U. S. A.

Compiled and Reproduced From Original by Jensales Inc.

ALLIS CHALMERS MODEL WD

WITH THE SUCCESS AND POPULARITY OF THE WC ALLIS­CHALMERS, THE COMPANY INTRODUCED IN 1948 THE WD TRACTOR.

THE WC REMAINED IN PRODUCTION THAT YEAR, THUS IT IS POSSIBLE TO OWN BOTH MODELS MADE IN 1948. THE WD CONTINUED TO BE MANUFACTURED THROUGH 1957. IT IS ESTIMATED THERE WERE APPROXIMATELY 131,200 WD'S MANUFACTURED.

IN THE NEBRASKA TESTS THIS ENGINE PRODUCED A DRAWBAR PULL OF 4,300 LBS. FOR A TRACTOR THAT WEIGHED ABOUT 3,900 LBS., THIS WAS AN IMPRESSIVE SHOWING.

PROBABLY THE BEST DESCRIPTION OF THE WD WOULD BE A SUPER VERSION OF THE WC. IT HAD SEVERAL DESIGN INNOVATIONS THAT WERE READILY ACCEPTED AND HELPED MAINTAIN A LOYALTY TO ALLIS CHALMERS ORANGE.

AMONG THE IMPROVEMENTS WAS THE LIVE POWER PTO. THIS , ENABLED THE OPERATOR TO STOP THE TRACTOR BUT KEEP THE, PTO TURNING; AN ESPECIALLY VALUABLE FEATURE IN COMBINE O)?ERATION

THE WD ALSO INTRODUCED POWER ADJUSTED REAR WHEELS. THUS, WITH A TURN OF FOUR BOLTS, THE REAR WHEELS COULD BE ADJUSTED IN OR OUT. THIS FEATURE WAS TO BE COPIED BY MOST TRACTOR COMPANIES. FOOT BRAKES REPLACED THE HAND BRAKES.

THE WD SOLD FOR ABOUT $1,800 EQUIPPED WITH STARTER, LIGHTS, HYDRAULIC CONTROL, POWER ADJUST REAR WHEELS, AND A 201 CID ENGINE. THE ENGINE WAS KNOWN AS A SQUARE ENGINE; THAT IS, IT HAD A 4 INCH BORE AND A 4 INCH STROKE WITH A 1,400 RPM RATING.

THE WD ALLIS KEPT THE SLEEK LINES OF THE WC; NAMELY THE BULLET SHAPED TANK, THE STREAMLINED HOOD AND GRILLE. THIS OUTWARD APPEARANCE OF THE LATE STYLED WC, WD, AND WD-45 ALLIS TRACTORS WAS TO REMAIN UNTIL 1957, WHEN AN ENTIRELY NEW LINE OF TRACTORS WAS INTRODUCED WITH THE D-14,FOLLOWED BY THE D-10 AND D-12.

Compiled and Reproduced From Original by Jensales Inc.

ALLIS· CHALMERS MANUFACTURING CO.

Milwaukee, Wisconsin

Allis-Chalmers "WD-45"

AlUs· Chalmers General "WD.46"

Number and Size-Plows. . . . . . . . . . . . .. 3-14 Type-Axle, Adj. Axle, Tricycle...... All Shipping WeIght on Rubber-Lbs...... 4450 ~ebraska Test Number (Gasoline)... 499 Rear Tread, Adj. Range-Inches... .. 56-90 Height Overall-Inches............. 81~ Length Overall-Inches •..••••..••. 127.1 Wheelbase-Inches ••.......•.•.•••. 88 Cultivating Clearance-Inches •.•... 29 Hydraulic Power Unit .............. Std.

'" Belt Pulley-P.T.O.-Engine Pulley Diame ter, S tandard-Inches. .. 9 Pulley Face Wid th:-Inches. . . . . . . . .. 6lh Pulley Speed, Loaded-rpm.......... 1260 Pulley Speed, Loaded-fpm ...•.....• 2960 Power Take-off-Standard, Optional. Std. Is Power for P.T.O. Continuous? ... Yes P.T.O.·Cont. When Gearshifting? ... Yes Engine-Make .......... . . . . . . . . . .. Own Engine-Model ..................... W -45 Number Cylinders & Displacemen t. . .. 4-226 Rated rpm ........................ 1400

Brakes-Steeri n9-Tires Brakes Type ...................... Shoe Drums Location-Wheel Axle Shafts,

Bull PinIon Shafts................ BPS Steering Type-Cam & Lever,

Worm' & Segmen t. . . . . . . . . . . . . . . .. W &S Tire Size-Standard Rear-Inches ' .. 12x28 TIre Size-Standard Front-Inches . 6.5x16

1954

Allis-Chalmers "WD-45"

ALLIS-CHALMERS MfG. CO.

Milwaukee, Wisconsin

Transmission of Power Clu tch-Dry Disc Spring Loaded? . .. • Final Drive-Bevel, Spur ............ Spur High Gear Ratio ................... 19.6 Low Gear Ra tlo ................... 72.6 Speeds-Number Forward .......... 4 Speeds-Number Reverse .......... 1

·WD has two clutches. Engine clutch Is single plate, sprIng loaded, dry type. TransmissIon clutch Is mul­tiple disc, overcen ter, we t type.

Compiled and Reproduced From Original by Jensales Inc,

MODEL "WD" & "WD45" TRACTOR INDEX

WD SUBJECT SEC TION S PECIFICA TIONS

AIR CLEANER ••••••••••••••• AMMETER & INSTRUMENT BOX •••••••• BA TTERY • • • • • • • • •••• BEL T PULLEY ••• !_ • • • • • • • • ••••

BRAKES. • • • • • •• >. • • • •• BREA THER ............ . CAMSHAFT ••••••••••• CAMSHAFT &: VALVE:LIFTER. CARBURETOR •••••••••• CLUTCH-ENGINE •••••••

. . . . . . . . . . · . . . . . . .

CLUTCH-HOUSING • • • • • • • • ••••• CLUTCH-TRANSMISSION ••••••••• CLUTCH THROWOUTBEARING ••••••• CLUTCH RELEASE SHAFT & FORK •••• CLUTCH SHAFT ••••• • • • • • • •••• COOLING SYSTEM •••••••••••••••• CONNECTING ROD BEARINGS •••• CONNECTING RODS ••••••••••••••• CONTROL PISTON AND LINKAGE. • • • •••• CRANKSHAFT BEARINGS • • • • • • •••••• CRANKSHAFT & MAIN BEARINGS. CRANKC3HAFT OIL SEALS • • • • • • • • • • CRANKSHAFT WICK •••••••• · . . . . CYLINDER HEAD •••••••••••••••• CYLINDER LINERS, PISTONS & RINGS DIAGNOSIS OF TRACTOR PROBLEMS •••••• DIAGRAM, WIRING ••••••• DIFFERENTIAL •••••••• DISTRIBUTOR TOP ASSEMBLY •• · . .

. .

. . DISTRIB UTOR DRIVE. • • • • • • • • • • • • • • DRA WBAR ••••••••••• . . . . ELECTRICAL SYSTEM •• . . . . . . . . . ENGINE • • • • • • • • • • • • • • • • •••• ENGINE CLUTCH ••••••••••••••••• ENGINE REMOVAL. • • • • • • • ENGINE DIAGNOSIS •••••••••••••••• ENGINE OILING SYSTEM ••••••••••••• ENGINE SUPPORT •••••••••••••••• FAN &: WATER PUMP~' • • • • • • • • • • • • • • FENDERS • • • • • • • • •• • •••••••••• FILTER OIL. • • • • • • •• • • • • • •••••• FINAL DRIVE & REAR AXLE. • • • • •••••• FLYWHEEL. • • • • • • • • • •••••••• FRAME CHANNELS •••••••••••••••• FRONT ENGINE SUPPORT. • • • FRONT SUPPORT •• ,. '. • • • • •• FRONT WHEELS •• ~". • • • • •••• FRONT & REAR OIL SEALS ••••••••••• FUEL ..•.••••••••• . . . . . . . FUEL TANK & SUPPORT •••••••••• GEAR COVER TIMING ••••••• GENERATOR • • • • • • • • • • • • • • • • • GOVERNOR LINKAGE •••••••••••••• GOVERNOR &: MAGNETO DRIVE ••••••••• HEAD, CYLINDER ••••••••••••••••• HEADLIGHTS ••••••••••••••••••• HOLD POSITION VALVE . . . . . . . . . . . . .

WD & WD-45 1

Page

26 58

60 46

13 13 27 30 31 34 31 31 31

16 16 65 15 15 17 17 11 14

59 43 Z4 23 47 58

30 8

28 9

25 58 19 44 29 37

9 50,54 49,54 17

55 20 26 20 22 11 58 63,64

Compiled and Reproduced From Original by Jensales Inc.

Page

4

6 6 6 4 4

4 5

6

4 4 4

4 4

6

6

4

6

6

6

6

" ,

"WD"-"WD-45" _ TRACTORS.

MODEL "WD" & "WD45" TRACTOR INDEX (Contld.)

SUB] I<C T

IIOOD •••••••• HYDRAUUC PUMP HYDRAULIC RAMS HYDRAUUCSYSTEM INSTRUMENT BOX • LIFT SHAFT •••• LIGHTS ••••••• LUBRICATING OILS lvlArN BEARINGS ••

. . . . . . . . . . . . . . .

1v1AGNETO. • • • • • • •• l'v1AGNETO DRIVE ••• MAGNETO TIMING • • ••••••• MANIFOLD • • • • • ••••••• OIL FILTER ASSEMBLY ••••• OIL PRESSURE RELIEF VALVE ••••••••• OIL SEALS CRANKSHAFT •• OIL SYSTEM • • • • • • • • •• OII~ SUMP. • • •••••••••••• . . OIL PUMP. • • • ••••• PISTON • • • • • ••••••• PIS TON RINGS • • • • • • • • • • • • POWER STEERING • • •••••••••••• POW ER TAKE-OFF. • • • • • • • POWER TRANSMISSION •••••• PRESSURE RELIEF VALVE ••••• PUMP, HYDRAULIC. • • • • • ••••••• PUMP, WATER & FAN ••• •• • ••• PUMP LINKAGE AD] USTMENT ••••••••• PUMP TESTING. • • • • • • •••••• PUMP TIPS ••••••••••••••••• QUADRANT & THROTTLE LEVER ••• RADIA TOR ••••••• • ••••••• RADIA TOR SHUTTER. • • •• RAMS, TRACTOR. • •••••••••••• RAMS, REMOTE. • • • • • • • • • • • • • • • REAR AXLE. • • • • • • • • • • • • • • • •• REAR WHEEL & RIM •••••••••••• RELIEF VALVE, OIL PRESSURE •••••••• ROCKER ARM ASSEMBLY •••••••••••• SEA T • • •••••• II ••••••••••••••

SHAFT & FORK, CLUTCH RELEASE •••••• SNAP COUPLER AND TRIP LEVER ••••• SPARK PLUGS •••••••••• SPEEDS ••••••••••••••••• STARTER •••••••••••••••••

. . . STEERING SHAFT SUPPORT

& STEERING WHEEL • • • • ••••• STEERING SPINDLE SHAFT & GEAR •••• STEERING WORM & SHAFT ••• SUPPORT, FRONT ••••••••••• TAIL LIGHT. • • • • • • • • • • ••••

. .

THROTTLE LEVER •••••• TIMING GEAR COVER & GOVERNOR

. . . LINKAGE •••••••••••••••••

TIRES (FRONT OR REAR WHEELS) • • • • • • • TORQUE TUBE • • • • • • • • • • • • •• TRACTOR PROBLEMS •••••••••• TRANSMISSION • • • • • • •••

WD SECTION

Page

8 63 61 68 58 62 58

15 22 22

25 19 19 17 28 18 18 14 14 75 36

19 63-74 25 61 66 66 22

8 8

73 62 44 49 19 10 56 31 48

27

57 50 57 50,54 58 22

20

32,33

38,40

WD & WD-45 2

SPEClFICATIONS Page

7

6

5

5

5 5 5

6

7

4

7 7

6

5 6 7

6

6

Compiled and Reproduced From Original by Jensales Inc.

MODEL "WD" ~ "WD45" TRACTOR INDEX (Cont'd.)

WD SUBJECT SEC TION S PECIFICA TIONS

TRANSMISSION CLUTCH 00 0 •••••

TRANSMISSION SHIFTER ASSEMBLY VALVES. 0 0 ••••••

VALVE COVER •• 0 0 •

VALVE TIMING 0 0 0 0 •••

WATER PUMP & FAN • 0 •••

WIDE FRONT AXLE • WIRING DIAGRAM 0 0 . . . . .

Page

34 38,42 11

9 11 25 54 59

Refer to rear of manual for additional miscellaneous infor· mation on following.

ENGINE VALVES ......................... 3 CARBURETOR & INJECTION PUMP . . . . . . . .. 5·35 TRANSMISSION . . . . . . . . . . . . . . . . . . . . .. 37·42 ELECTRICAL SYSTEM & MAGNETO ....... 43· 55

WD & WD-4S 3

Compiled and Reproduced From Original by Jensales Inc.

Page

6

5

5

BELT PULLEY

Diameter Face R.P.M.

Ratio Rotation Location Height

BRAKES

Type Location Adjustment Drwn Dia.

DIFFERENTIAL

Type Ratio (Std.)

9 11

6-1/2" 1260 at 1400 R.P.M.

goverJiled speed, 1530 at 1700 R.P.M. high idle

1 .11 engine to 1 pulle y Clockwise R.H. Side

31-1/2"

Enclosed contracting One on each rear axle

Nut 7 -7/8"

Two Pinion

SPEEDS

WD Tractor First Second Third Fourth Reverse

W D-45 Tractor Fii"'st Second Third Fourth Reverse

STEERING

Lubricant Capacity Std. dual Front

All after

2-1/2 M.P.H. 3-1/2 M.P.H. 4-3/4 M.P.H.

9 M.P.H. 2 M.P.H.

2-1/3 M.P.H. 3-1/2 M.P.H. 4-3/4 M.P.H.

10-3/4 M.P.H. 3-1/4 M.P.H.

prior to WD-71438 3 pts. U.S.

1 pt. U.S. Single front Wheel or Adjustable axle

WD Tractor WD-45 Tractor

Lubricant Capacity

3.5 to 1 3.3 to 1

17 Qt. U.S.

Ratio

T RANSMlSSION

1 Qt. U.S. 12 to 1

DRAW BAR

Type Height

FINAL DRIVES

Lubricant Capacity

FRONT WHEELS

Tire Sizes Air Pressure

POW ER TAKE-OFF

Type Spline size R.P.M.

Height Distance ahead of Hitch Point

REAR WHEELS

Tread Tire Size

WD Tractor

WD-45 Tractor

Air pressure

Type Lubricant Capacity

Swinging

Four Speed 17 qts. U.S.

12" to 23" TRANSMISSION CLUTCH

1 Qt. U.S.

5.50x16 28 lbs.

Type

Disc dia. Lining

BATTERY

Capacity Size

Multiple disc over center s pring loaded.

7" Bi-Metallic

6 volt 95 Amp.

Specific' gravity (Full Charge) 15 plate

1.270

Clutch INSTRUMENT BOX 1-3/8"x6B

548 at 1400 of Eng. Arnrrieter 665 at 1700 of Eng.

20-3/4" Fuse

9" and 14" LIGHTS

56" to 90"

11 x 28 or 12 x 28

12 x 28 or 13 x 28 121bs.

Bulbs Candle Power

GENERATOR

Type Charge Rate Drive Lubrication R.P.M.

WD &: WD-45 6

Light Switch controls generator charge rate

15 Amp.

6-8 volt single contact 32

Third brush 3 to 13 amps.

V belt Oilers-front and rear 27 to 2775 at high idle

Compiled and Reproduced From Original by Jensales Inc.

ROCKER ARM ASSEMBLY

Removal

Remove the hood and valve t:over. Remove oil line from head to rocker arms and the four support retaining nuts and washers. Lift assembly from head.

Remove the cotter pins or hairpins from the end of shaft and remove the rocker arms, springs and supports from the shaft.

Inspection

Check the shaft and rocker arm bushings. The combined clearance should not exceed .008!' The rocker arm face contacting valve should be refaced if worn flat. Reface to correct curva­ture on the valve lathe. The two halves of the supports should be oil tight at the joint and flat at top surface contacted by the flat washer. All supports must be of the same length from center of shaft to cylinder head.

The intake rocker arm has an oil shed ground in its upper surface between the shaft and the valve stern. This shed governs the amount of oil allowed to reach the intake valve. Excess oil to intake valves causes abnormal oil con­sumption. Check the assembly while in opera­tion and correct any leaks or spray which might strike intake valves. In the event of continued oil consumption it may be necessary to decrease the width of oil shed slightly.

In some extreme conditions the oil to the ex­haust rocker· arm caused a splash from the exhau3t valve spring to the intake valve. Ex­cessive wear of rocker arm bushings will cause unseen distribution of oil to the valves.

Assembly

Assemble the short spring towards the center oil tube connection. Place the exhaust arm. support, intake arm, long spring, intake arm support, exhaust arm, washer and retainer on the shaft in order. Assemble opposite end the same. Install supports so split side of support is towards the push rods. Use the short cork in shafts with cotter pins.

Late type shafts do not have the center collar on shaft. The oil tube simply enters hole in shaft.

When tightening assembly to head, shift shaft supports, etc., until the two end rocker arms are free.

Adjust the valve clearance to .012" with the en­gine heated to normal temperature. Adjust the

FLAT WASHER

valves with cylinder on its compression stroke. Valve breakage is caused by worn guides, rocker arm contact surface worn flat, valves sticking or excessive valve lash clearance. (For furhter information refer to VALVES general section).

Excessive valve lash clearance retards valve timing and lowers engine efficiency.

When installing the valve cover, do not tighten retaining nuts enough to crush the cover. Stop tightening just before cover strikes the cylinder head.

ROCKER ARM OIL BAFFLE

Effective WD-45 engine ],,3087, oil baffle 226721 was used in production., and should be installed on all WD-45 Engines 1001 to 13087, this baffle is placed on the four support studs .and held in position by four pal nuts. The baffle is used to keep oil splash from push rods from striking valve sterns to eliminate oil consumption.

Effective WD-45 Engine 28420, baffle 226761 was used, this baffle is similar to above, but is retained to support studs by the support stud retaining nuts, (no pal nut necessary) both above baffles are used with the new type cylinder head and the short rocker arm shaft supports.

Baffle 227137 is supplied to be used on WD engines prior to 289000 (except 253200 thru 253489) that have the old type cylinder head (3" high) and taller rocker arrn supports, where the engine block has been replaced with the newer type WD-45 Block.

A new cylinder head gasket 227077 has been made available for service on engines prior to 72459, and replaces gasket 211433 when engine is equipped with the new 227049 cylinder block assembly.

WD & WD-45 10

Compiled and Reproduced From Original by Jensales Inc.

MACHINED SURFACE TOP OF HEAD

NEW STYLE HEAD VALVE GUIDE INSTALLATION

9 15 4 13 3 14 10

12 8 5 2 6 7 II

When using the old style 3 11 high head guides must be pressed in the head until the bottom scribe line on guide is flush with the top of head. The exhaust guide is the shorter. When installing valve guides in new cylinder head (used on engine #lW -289000 and up) it will be necessary to drive exhaust valve guide until top of guide is flush with machined surface as shown in sketch at IIA II .. Drive intake guide to 1/8 11 below mach­ined surface as shown at liB II. Use a press or a special driver to install guide to prevent swell­ing and collapsing guide bore.

Refaceothe valve seats using a high speed grinder and 45 stone. Use a 600 and 300 stone to narrow seat surface. The seat width should be 1/16 11 •

Lap the valve to its seat, using fine compound. The seat should be polished all the way around. Check by making pencil marks across face of valve about 1/4 11 apart. Place valve on seat and rotate valve about 1/2" using high pressure. Turn valve on equal distance in opposite direc­tion. Repeat several times. The pencil marks will have their centers broken if the seat is good. If all are not broken repeat the lapping operation.

Oil the valve stem and seat. Place valve in position and install safety snap wire, spring seat, spring, spring retainer and locks.

Effective IIWD,tt. Engine #1299173 PA and above a positive type roto cap is used on the exhaust valves.

The purpose of the positive type roto cap is to turn the valve slightly each time it is opened to reposition it on its seat.

ROTOCAP

The roto cap is installed in the place of the valve spring retainer (as shown). All other valve parts remain the same, and the specified clearance of .012 11 is retained.

These rotor caps can be installed' on all IIW II engine exhaust valves. I

A new gasket eff. IIW II engine 289000 used for service on all engines above,. "w II 72458 having varied sized water openings on right side of gasket to more evenly control water temperature. The smallest of these openings toward front, Gasket #1211433 to be used on all engines prior to IIW II engine #172.458.

Insta,ll head using a new gasket. Tighten to 90 Ibs. torsion following the chart. On the three 3/8 11 stud tighten to 2.5 Ibs.

If leaking cylinder head gaskets are encountered the tapped holes in the top surface of the cylinder block should be checked for depth. The holes should be 1 -1/4 II deep and contain 7/8 II of full thread. They may be checked by installing the long and short capscrews in their respective holes, finger tight. The long capscrews should measure 3-13/16 11 or less between under side of capsc rew head and cylinder block. The short capscrew should measure 3_1/4 11 or less. If these measurements cannot be obtained, retap the hole with a 1/2. 11 - 13 bottoming tap one or two threads deeper.

A new cylinder head gasket 2.2.7077 has been made available for service on engines prior to '12.459, and replaces gasket 2.11433 when engine is equipped with the new 2.2.7049 cylinder block assembly.

WD lit WD-4S 12.

Compiled and Reproduced From Original by Jensales Inc.

adjusting delayed action screw "e" (See instruc­tion book for location). After the front gangs are fully lifted the pressure increases until the check ball is forced frotn its seat raising the rear gang.

When lowering, move lever to detent position; the pUtnp is then in the lowering position which drops the front gang only. Further tnovetnent of the hand control lever turns the catn against the catn pin forcing the ball frotn its seat re­leasing oil frotn the rear ratn, dropping the rear gang.

The delay is governed by the atnount of spring pressure applied to check ball by delayed action

screw "e" and check ball spring. The delay tnay be further increased by cutting down the pUtnp volutne by turning in on volutne screw "D".

The putnp is operated at engine speed and the adjusttnents are tnade to cotnply with the par­ticular forward gear used. For exatnple - if adjusted to secure the desired delay in third gear, the pUtnp will need to be re-adjusted if any other gear is used, in prder to secure the satne atnount of delay.

With delayed action screw "e" turned clear in. It should require 875 to 975 P.S.I. to raise the ball frotn its seat.

PUMP, RAM AND DRA WBAR

This chart shows the drawbar, drawbar spring, link rod, putnp, etc.

The drawbar is connected to a fork which pivots in the·drawbar support and its upper end bears against the drawbar spring.

This spring is a variable rate spring, requlring very..little pressure to cotnpress it at start and gradually requiring tnore pressure as it is COtn­pressed towards a solid height.

The spring is preloaded in position to 500 lbs. tension by use of shitns. It s tnaxitnutn pressure is 4000 lbs. when fully cotnpressed. NOTE: When old style valves, sleeves and catns

DRAWBAR CONTROL LEVER

are used as on pUtnpS prior to 37852, this pressure is 3000 lbs.

These figures are drawbar pounds pull required to cotnpress spring. The spring is thus used to tneasure drawbar pounds pull.

Movetnent of the drawbar is transtnitted throu.gh the link rod to the pUtnp, where it controls the position of the control valves. The link rod is adjusted when the drawbar is in a free position (without load) and the draft control lever is locked to housing. The rod is adjusted until it has 1/32" clearance between pin and end of slot. 1£ the link rod is too long it will cause erratic draft control and if too short tnay break linkage.

WD & WD-45

73

Compiled and Reproduced From Original by Jensales Inc.