The CADDigger Model 728 was the first CADDigger and stillis very popular. Similar to our other plans the 700 Series canbe built by the homeowner, no machining necessary.

The Model 708 fits the 2000 pound or larger Category 1hitch equipped tractors. You power it from the tractorhydraulics or add a PTO pump.

The Model 728 is a freestanding version of the 700 Seriesthat needs no tractor. As a freestanding it can move itselfaround the worksite using the bucks or move the wheels tothe opposite end and tow the Model 728 to the next work-site.

The Model 710 is the Model 708 plus plans to convert theModel 708 to freestanding. In this form the Model 710 per-foms like the Model 728, self moving and convertible to atowable or 3 point hitch version.

Up to seven feet of digging depth and a bucket width upto 14" makes these machines perfect for the mid sizejobs. Low cost easily available components insures sim-ple construction.

The mid size of the 700 Series keeps your costs downand but still offers the longer reach of a larger backhoe.

Most customers build at least 2 sizes of buckets. Thebuckets are easily changed by pulling 2 pins. This addsto the versatility of the CADDigger 700 Series. Thedrawings are easy to understand. CADplans has spentthe time making the design of the 700 Series easy tofabricate. No micrometers or milling machines required.Simply cut and weld. The CADDigger 700 Seriesmachine is up and running FAST! Your plans will alsospecify all of the valves, pumps and engines so yourCADDigger will function properly without you having to"research" these components.

To make your fabrication even easier, CADplans hasarranged to have MetKit Corp. offer any or all of thematerials and components you need to build yourCADDigger. Buy some of the parts or the complete kit.You decide how to acquire the materials. MetKit evenoffers a steel kit with all parts precut and predrilled,ready for you to start assembly. MetKit Corp. can shipthese kits by UPS direct to your home or business soyou will not have to worry about how to get the materi-als to you. MetKit offers everything from the tires to theseat to make your construction simple.MetKit will even supply steel custom cut to your require-ments so you can make the custom attachment youwant.

One of the best features of the CADDigger is the lowcost. CADDigger typically costs 1/4 or less of a com-parably sized machine. Since you build CADDigger youinsure quality and should the need arise, you will knowhow to service anything in the machine.

The large tires of the freestanding versions of the 700 Series lets CADDigger move easily around the jobsite. Othermachines of this type have small tires, limiting their capability to get over the "mounds and humps" that are there when you

- are digging.

6 call 1-540-992-4758 for ordering assistance

For ease of construction, ruggedness and handling the700 Series is designed with thick section metals. Thisthick metal is easier to weld and gives the durabilityyou need. Also the thicker metals gives you themachine weight necessary to keep the center of gravi-ty low and insures no frame flexing occurs when youuse your CADDigger.

CADDigger NOTE: Reach is the distancethe CADDigger can place the bucketstraight out in front of the CADDigger. It ismeasured from the pivot to the bucketteeth on level ground.

SPECIFICATIONS: 708 728 710

HPWHEELBASEWIDTH AT STABILIZERSWIDTH WITHOUT STABILIZERSSEAT HEIGHTLOADING HEIGHTMINIMUM LENGTHFRAME LENGTHREACHDIGGING DEPTHRIPPING POWERLATERAL SWINGOPERATING PRESSUREOIL TANKWEIGHT AS SHOWNWHEEL SIZETBRE SIZEPUMPWIDTH OF BUCKET

TRACTOR POWEREDN/A84"31"40"64"74"32"122"72"*3 0 0 0 POUNDS*120 DEGREES1500 PSI*TRACTOR OR 2 GALLON800 #N/AN/ATRACTOR OR PTO6" TO 14"

784"84"31"34"64"120"80"122"72"*3 0 0 0 POUNDS*120 DEGREES1500 PSI*3 TO 5 GALLON1000#14" OR 15"27" TALL4GPM6" TO 14"

784"84"31"40"64"124"84"122"72"*3 0 0 0 POUNDS*120 DEGREES1500 PSI*3 TO 5 GALLON1100#14" OR 15"27" TALL4GPM6" TO 14"

CADDIGGER PLANS- $119.95 $119.95 $139.95Order by credit card, check or money order

*High Performance Upgrade Available

The 700 Series Digging Depth, Ripping Power and Operating Pressure can be upgraded to 7 feet,4000 pounds, and 2000 psi respectively with special High Performance cylinders offered by MetKit.Contact MetKit for details at 1-540-387-4995. Only the 700 Series machines are upgradeable in this way. Askfor the High Performance Option.

CADplans Corp- Your source for the plans you need to"Build It Yourself- When Only Tlie Be$t Will Do!"

CADDigger Model 728 Assembly Instructions

DisclaimerThese instructions do not purport to cover all details or variations in equipment, nor to provide for everypossible contingency to be met during construction, operation, and maintenance. Should furtherinformation be desired or should particular problems arise that are not covered sufficiently for thepurchaser's purpose, the matter should be referred to CADplans Corp. Daleville, VA.

This document contains proprietary information of CADplans Corp. and is furnished to its customerssolely to assist that customer in the construction of the equipment described. This document shall not bereproduced in whole or in part nor shall its contents be disclosed to any third party without the writtenapproval of CADplans Corp. Daleville, V A.

CADplans makes no claim of merchantability or fitness, for any particular purpose of these plans.Builder of this equipment must accept all liability responsibility including safety and compliance withprovisions of any laws or acts. In no event shall CADplans liability exceed the purchase price paid forthese plans and any legal actions brought against CADplans shall be tried in the state of Virginia, Countyof Botetourt. We shall in no event be liable for death, injuries to persons or property or incidental,contingent, special or consequential damages arising from the use of our products.

Phone CallsWe have installed toll free line for ordering and brochure request only. For technical assistance or otherinquiries please use our customer service number 540-992-4758 between 6:00pm and 10:00pm ET.

PaymentsWe must receive payment in full before technical assistance is available. If you received an invoice withyour order, payment is due upon receipt.

ReplacementsIf the merchandise is found to be defective or damaged in shipment, contact CADplans for replacementitems.

Copyright .No part of this work, instructions, video, drawings, or photos, may be reproduced or utilized in any formor by any means, electronic or mechanical including photocopying, recording or by any informationstorage and retrieval system, without prior written permission of the original copyright owners,CADplans Corp.

CADplans Model 728 Assembly Instructions© CADplans Corp.

Thermal distortion will require you to hand adjust the holes. This is normal. The more even thetemperature a part remains, the less distortion will occur, but distortion will occur. Test fitting pins inholes will reveal distortion. The hand reamer recommended in the instructions makes quick work of the1" holes. If a pin is stationary in a hole (such as the cylinder pin holes in the boom), precise fit is notalways mandatory. I have been known to install a pin with a ball peen hammer with excellent results.This is not the case where the pin must rotate. Precise fitting is called for here. Take your time andmake the fit correct. Grind and ream as necessary to make the mating pin fit the hole. Don't scrimp oneffort here, as a quality fit will result in a quality machine.

HydraulicsHydraulics hoses are usually least expensive pre-assembled in standard lengths. Use hoses rated 2000psi min. working pressure or greater (not bursting pressure) Use the hose size that matches yourcomponents. Any hose 1/4" ID or greater is acceptable. Matching hose size to cylinders and the valvewill reduce the number of adapters, which can cost as much as the hoses. Hose lengths are not given dueto various components used, just insure the hoses are not stretched when the machine is moved throughits travel. Only couple hoses with high pressure couplings. Parts available at the hardware store are nothigh pressure rated and can burst. The open center stack valve recommended is straight forward indesign, (1) inlet, (1) outlet, and (2) connections for each cylinder. The inlet is the side with the pressurerelief valve built in. If you reverse the inlet /outlet you will blow an o ring out of the valve or possiblyhave a more serious result. Be careful with this connection. Monitor the oil temperature closely.Serious injury to the operator and/or the machine can result from oil temperature above 130 degrees F.

Bronze BearingsCheck for these at a store in your yellow pages under "Bearings". Be sure to get "finished" ID & OD asbronze bearings are available to "Rough Dimensions" with extra material for final finishing. Rough

dimension bearings are OK if you have a lathe and wantto turn the bearings for fit. Use care when pushing thebearings in the mechanical tube. Too much forcepressing in the bearings will crush the ID, which willthen require reaming. Use a hand grinder or a file togrind a groove around the bearing where the grease holewill be (See Fig. 2). This will insure grease can still getin the bearing if the bearing rotates.

Bucket TeethI have not recommended a specific brand of bucket teeth but just about any kind of small to mediumtooth will do. Maintain 130 degrees between the leading edge of the bucket and the teeth. If you wish,you can fabricate the teeth. Simply cut some 3/8 steel 1 1/2" wide x 2 1/2" long. Cut a support from 1"x 1" x 5" for each tooth. Grind an angle where the support will hold the tooth so the tooth will be at a130 degree angle to the leading edge of the bucket. Grind the back of the tooth to 30 degrees for relief sothe tooth will cut. Hard surface weld on the front of the tooth increases the life of the tooth. One beadaround the front surface is usually enough.

Operating TipsTake your time learning to operate CADDigger. Notice CADDigger works by "clamping" earth betweenthe teeth and the stabilizers. Don't try to push the bucket into the ground more than a couple of inches.Keep the teeth cutting towards the stabilizers and you will be pleased with CADDigger's power. If youencounter a rock too big for CADDigger to handle, dig a hole next to the rock and push the rock into thenew hole. If you still can't move it, talk to your dynamite expert. Have fun with CADDigger and sendme a photo when you get done.

CADDigger CONSTRUCTION

CADDigger is buiit from the drawing package, photos and video. Carefully watch the video to help youlearn special construction techniques and tips such as hole fabrication, bucket construction, and otherfeatures such as hydraulic circuit construction.

GENERAL TIPS:=> Some holes, such as those in the link bars, can be drilled 1.00" diameter rather than by fabricated

assembly, if you have the equipment to drill a hole this size.

=> A hand reamer has been found to be invaluable in aligning the 1" holes in CADDigger. Excellenthand reamers are supplied by ENCO (1-800-873-3626) such as:

Item # Description Estimated Cost3335145 Straight flute hand reamer S18.65 or3335449 Spiral flute hand reamer $19.90

These reamers are almost 11" long and allow through reaming of holes for alignment. Use a 12"adjustable wrench to turn the reamer. Either of the two reamers are adequate.

=> Some mechanical tubing or drawn over mandrel (D.O.M.) tubing runs undersize inside. If thematerial you find is undersize, on the ID, then you must ream to 1.002" ID and 1.502" OD. This canbe done by hand if removing less than .015". An alternative to reaming the 1.50" inside diameter ofthe mechanical rube would be to reduce the OD of the cast bronze bushing so that it will fit in themechanical tubing. This can be done on a lathe or by hand such as carefully reducing the OD with abelt sander and repeatedly checking for fit. Do not us a heavy press fit or hammer in the bushing asthis will crush or reduce the ID and the pin will no longer fit. 1.5" OD x 1" ID mechanical tubingcan be substituted for 2" OD x 1" ID.

=> Use high strength welding techniques such as 6011 or 7018 stick welding electrodes. Avoid lowerstrength welding processes such as 6013 stick welding electrodes or small flux core or MIG welders.Consult a local welding supply or CADplans if you have questions.

=> Tolerance buildup and variation in components used can cause the cylinder rod to hit the boom pivotcomer. Insure the rod does not hit the pivot when the cylinder is fully extended. There are two waysto fix this situation if it occurs, either bevel the corner of the boom pivot for clearance, or move the23.50" cylinder mounting location back. The correct location can be determined by trial and error.

=> You may deviate from specified items if you find alternates with the same generic specification(such as engine valve, pump, etc.)

=> All steel is hot rolled, unless otherwise specified. Cold rolled may be substituted, but is not required.

=> Alignment of parts within an assembly is best accomplished by assembling the mating componentswhile tack welding. For example, when tack welding the boom, assemble the two cylinders to insurethey are parallel to the boom. Also assemble the boom extension to insure the boom extension isparallel to the boom. This technique will insure the mating components will mate and are properlyaligned. You can even move parts through their motion to insure they function prior to finalwelding.

CADDigger CONSTRUCTION

=> Anchor pivot pins. Pins on the main pivot and boom must not turn or excess wear will result in thesteel part. Two ways I have successfully anchored these pins are welding or cross pinning. To weld,simply insert the pin and weld a 1/2" long bead between the pin and the frame. This is whatCADDigger is designed for. The pin can be cross pinned. To do this, extend the mechanical tube1/2" on one side (remember to order extra if you do this), drill a 1/4" hold through the mechanicaltube and the pin, and drive in a 1/4" x 2" roll pin. Pins that rotate very little, such as the rear pin onthe boom extension cylinder and the bucket curl cylinder, can use a welded pin, cross drilled pin or abolt & nut. If a bolt is used in any pin application, make sure that clear bolt (no threads) ends upagainst the inside of the mechanical tubing. The 4140 pins on Sheet 10 can be substituted with grade8 or 9 bolts. The bolts you obtain must have a good quality finish so they will run smooth inside thebushings. Use caution welding the pins. High strength materials must be welded with low hydrogenrods to eliminate cracking.

I N S T R U C T I O N S :

STEP 1 => OBTAIN HYDRAULIC CYLINDERS.* Obtain your hydraulic cylinders prior to construction of the boom or boom extension. The closed-

pin center-distance must be 21.5 inches with 14" or 14.5" stroke.* If your closed-pin center-distance is not 21.5 see Modification Section titled "Modify closed-pin

center-distance".

STEP 2 => FABRICATE FRAME* Fabricate the frame using drawings sheets 1A through IE.* Maintain material thickness carefully because the slip fit features, such as the outriggers and axles,

will only function with the specified material thickness.* Use Diamond plate specified on sheet 1C. This is an important safety feature to ensure the foot rest

or step of CADDigger are a non-skid surface. Oil will occasionally be spilled on CADDigger duringassembly and usage. If a hose should fail during operation, you want to maintain a sure footing.

STEP 3 => FABRICATE FRAME AXLES AND OUTRIGGERS* Drill holes in axles for pinning by inserting the axles in the engine end of the frame fully and drilling

a 5/8 inch hole halfway out from the frame, then insert a 1/2 inch pin.* Repeat this operation for the axle tubes at the Boom Pivot end of the frame.* Similarly, insert the outriggers in the frame and drill a 5/8 inch hole and insert 1/2 inch pin. Slide the

outrigger support (item 2 on sheet 6) into the outrigger and drill a 5/8 inch hole through both theoutrigger and outrigger support. Special note: several holes can be drilled in the outrigger support toallow CADDigger to be adjusted for operation on uneven terrain. This compensates for not havinghydraulic adjustments on the outrigger.

* Repeat this operation for both sides.

STEP 4 => MODIFY ENGINE MOUNTS* Modify engine mounts for the engine/pump combination you have selected. Two pieces 2.5 x 2.5 x

1/4" angle welded to the rear of the frame makes an acceptable mount for an aluminum 8 horsepowerengine but larger engines should have a heavier mount.

CADDigger CONSTRUCTION

STEP 5 => ATTACH SEAT* Obtain a piece of schedule 40 pipe, approximately 14 inches long that will loosely fit over the piece

of schedule 40 pipe shown on sheet IE.* Weld a piece of 1/4 inch plate to the pipe that will be large enough to fit the bolt pattern of your seat.* Bolt your seat (such as Northern Item Number 1741) to this 1/4 inch plate. Slide this pipe seat

assembly onto the pipe shown on sheet IE.

STEP 6 => COMPLETE BOOM AND BOOM EXTENSION* Follow drawing sheets 2 ,3 , and 4.* Adjust the length of the mechanical tubing pieces to obtain a spacing between the tubing pieces thatmatches the width of the end mounting of the cylinders that you acquired.

STEP 7 => FABRICATE BUCKETSheet 8 shows CADDigger with a 14 inch bucket but your needs may cause you to vary this width.Remember that a narrower bucket will allow CADDigger to penetrate the soil easier, while a widerbucket will require more force to push the bucket through the soil. For heavy clay type soils the 14 inchwide bucket depicted is the maximum recommended for general excavation. The corn cutter bladesshown on sheet 8 were parts that were available at the time CADDigger was constructed. If you don'thave a source of these, they can be replaced by other high wear resistant materials such as snow scrapperblades, or other high carbon steels. The straight section of 14" plowshares can be successfullysubstituted. Use care in welding any of these high carbon steels as cracking and embrittlement can occurif the incorrect welding rod is used. Follow recommendations of your local welding supply center.

STEP 8 =>FABRICATE PIVOT PINS, BUCKET LINKS & BOOM PIVOT* For the boom pivot, adjust the distance between the mechanical tubing that you weld into these

pieces to support the cylinder to the width of the end mounts of the cylinder that you acquired.* Use cast bronze bushings, do not use porous "oilite" type.

STEP 9 => ASSEMBLE CADDigger* Hand fit mating parts such as the frame to the boom pivot, the boom pivot to the boom, the boom to

the boom extension carefully to ensure CADDigger is able to function with minimum amount ofsloppiness in the joints.

* Use a rotary rasp and drill or hand reamer during hand fitting to ensure the parts fit properly.* Lubricate the parts at assembly with a molybdenum bearing grease, or a synthetic extreme-high-

pressure lubricant.* Mount the valve body to the frame, as shown in the video. This mount is not shown in the drawings

as you must customize it to fit the valve you acquire, but is built similar to the seat mount in step 5.

STEP 10 => PAINT* Prime with a good rust inhibitor containing zinc oxide or Rustoleum damp proof red.* Top coat with an exterior enamel for metal.

STEP 11 => HYDRAULIC ADJUSTMENTS* When you first start using CADDigger, it is strongly recommended that the relief valve be set low

(l000psi) and only increased with experience in the operation of the CADDigger. Do not exceed1500psi. The CADDigger depicted in the video operates at approximately 1200psi hydraulicpressure.

Read Before Beginning Construction

Material, Tools, & TechniquesPower and versatility in a small economical unit makes CADDigger a desirable machine to own. Themachine can perform digging tasks better than a farm tractor, yet doesn't disturb the soil like largemachines. A great deal of time was spent developing CADDigger so it could be built with only a fewmetal working tools.

Mechanical tubing is a heavy wall steel with a precision inside diameter. It is not pipe. Using thismaterial, you cut a piece, weld it in place and have a precision hole. Weld two aligned with a pin andyou have an assembly only a very big machining center could produce. Those customers who have themachines available to them can weld bar stock in place, lay out the holes, and drill & ream the holes toproduce CADDigger. This is a successful technique, but CADDigger was designed for the home ownerwithout machines or machining skills.

The only tools typically need to produce CADDigger are a welder, (stick preferred), bandsaw, electricdrill and hand tools. Other tools are helpful, but not necessary. If you have other tools and know how touse them, do apply them to CADDigger.

The techniques used are the latest applied by equipment manufacturers. Low tensile strength castings arebeing abandoned for steel fabrications. Steel is a very forgiving material to work with allowing you tocut and drill with little practice. Unlike castings or wood used in other projects, steel can be easilyrepaired should you make a mistake. And since the parts are so simple, don't feel bad about abandoninga part and starting over, which is better than having a defective part in your machine. Always remember,you are quality control. Make that part right now so you won't have a problem later.

Preparation , ; , ,...,.„•, ^r- ,.:Excavators and backhoes are notorious for the extreme power they can generate. From the first timehydraulics were applied to a shovel man knew this was the way to dig. This must be remembered whenbuilding CADDigger, the joints and assemblies are subjected to high forces. Take your time duringconstruction, align parts carefully and weld all parts fully wherever they touch. Use full size fillet welds.This means each leg of the fillet equals the thickness of the thinner part being welded. (See Fig 1.)

Full Fillet Weld Take your time when cutting parts with the bandsaw.45 degree angle Leg Length Increasing down pressure to increase cutting speed causes

premature blade failure and crooked cuts.

The more precise your parts are cut the easier yourassembly will be. Torch cutting and abrasive wheel cuttingcan produce good parts in the hands of skilled craftsman,but the bandsaw produces quality parts almost all of thetime. Precision alignment of parts comes from fixturing

Fig. 1 - Typical Full Size Fillet Weld during welding, block parts with steel scraps during

welding to minimize thermal distortion.Build the machine on a level surface. If you set up the frame on an unleveled surface, obtainingsquareness will be difficult. If the machine is not square, it will not dig properly and will not towstraight when converted or trailering.

Tack weld an assembly prior to welding and check for accuracy. A tack weld can be easily removed,where as a completed weld can cause you to scrap a part that was misaligned.

PURCHASED EQUIPMENT SPECIFICATIONS

CYLINDERS:Burdens 9-4 174 or equivalent2.5" bore. 14" or 14.5" stroke. 21.5" retracted length.

HYDRAULICS:CADDigger is designed to operate using open-center-hydraulics. This ensures that the pumpcontinuously moves oil through the open-center of the valve body as long as the motor is running. Oilflows at low pressure in the hydraulic system until the operator moves one of the control levers.

HYDRAULIC VALVE BODY:9SV-4-X-BBBB Burdens or equivalent.CADDigger needs a 4 spool valve body with integral relief valve. The spools must be 4-way. 3-position.and spring-centered.

HYDRAULIC FILTERNorthern Item Number 4020, 10 micron return line filter.CADDigger needs a return line filter for the hydraulics and a suction strainer in the hydraulic reservoir.

HYDRAULIC TANK & RESERVOIR:Northern item number 4050, 4.8 gal, or equivalent or fabricate from 0.09" steel sheet.CADDigger needs a 3 gallon minimum reservoir. It is very important that both the suction and returnlines of the reservoir are under the oil in the tank to ensure foaming does not occur. Use a breather onthe reservoir that has a filter in it to ensure dust is not drawn into the tank reservoir because each timeone of the cylinders moves in and out, air is drawn in or out of the reservoir through the breather.Suction Strainer-Northern Item Number 4011. This is for use with the tank above. Use this to stop theweld spatter, that occurs during tank fabrication, from reaching your pump.

HYDRAULIC OIL:Use International Harvester "HyTran" or equivalent.

RELIEF VALVE:The hydraulic valve has the relief valve built into it. Typically it is a screw that presses on a spring. Thehigher the hydraulic pressure, the higher the pressure is on the spring.

ENGINE AND PUMP:Northern Item Number 6080, 8hp, Briggs Engine or equivalent 7hp minimum.Northern Item Number 10564, 3 gallons per minute at 3600 rpm engine speed.A direct coupled engine and pump is specified for use with CADDigger.A maximum specification of 3 gallons per minute for the pump and 8 horsepower for the engine arerecommended due to cylinder size and speed of operation. Larger engines may be used, but, no greaterspeed or power will be achieved with CADDigger. The CADDigger shown in the video is 7 hp. Usecare when operating with engines larger than 8hp because the higher horsepower engines develop highhydraulic system pressures. You will bend parts of CADDigger using large engines and high hydraulicsystem pressures. You must set the relief valve at 1500 psi or less no matter what size engine you use.Note: Do not use a 2 stage pump. They are great for woodsplitters, but not for backhoes.

PURCHASED EQUIPMENT SPECIFICATIONS

HYDRAULIC HOSES:Hydraulic hoses can be obtained from sources such as Northern Hydraulics. Select a length long enoughto ensure the boom can swing through its complete travel both side to side and up and down. Selecthoses with fittings that will attach to both the cylinder and to the valve body. The best size hose is thatwhich matches your cylinders and valve to reduce the number of adapters.

TIRES:Local Junk Yard, 14 or 15 inch to fit your hubs. Note: Northern Item Number 12415, 5 hold lug design,fits old Ford and some Chrysler car wheels.DO NOT use small trailer wheels such as 8 inch or 12 inch rims because the CADDigger will have : ' *inadequate ground clearance.

REFERENCED PART SUPPLIERS:Hydraulics:

Burdens Surplus Center 1-800-488-3407Northern 1-800-533-5545

Steels:Metco Supply 1-800-521-8811

Tools: ;ENCO 1-800-873-3626

:'•> i' i t - - . - ' C ''S--S 4- I 7

Raw Material Requirements- Model 728

Material Description Qty # Requirements in Inches* Referenced* Allow extra material for cuts or modifications S h e e t s

2 x 2 x 1/4 Square Tube 1 2 4 + 2 4 + 2 0 = 6 8 72.5 x 2.5 x 3/16 Square Tube 1 72 + 14+14+29=129 1A, 1B3 x 3 x 3/X6 Square Tube 1 61 + 37 + 36+36+19+19= 214 1A, 3,63.5 x 3.5 x 3/16 Square Tube 1 31+10.5+8+8 = 57.5 1A, 64x4x3/ l6SquareTube 1 62.5 22.5 x 2.5 1/4 Angle 1 28 1A

3" Channel 1 20 1B1 1/2" Schedule 40 Pipe 1 13.5+9.5=23 1B2" Schedule 40 Pipe 1 13 81/2 x 2 Steel Bar 1 9+9+11+11 =40 111/2"x3SteelBar 1 10.5 + 14+14+9+9 =56,S 1C,3,83/8 x 2 Steel Bar 1_ 5+5+5+5 = 20 1E, 9l/4x 3 SteelBar l 5+2+2=9 91/4 x 3 1/2 Steel Bar 1 12+12=24 2l/4" Tread / Diamond Plate 2 24x34 1A1/4" Steel Plate 1 13x36 8

2each 21.25x13.5 85/16" Steel PIa te : . .16.5.x10. 12 x 12 2,31/2" Steel Plate 2 11x11 1A

2each 8x8 , 8x10 62each 14x9.5, 4.5x10, 4.5x4 9

1/2x3 High Carbon Steel 1 15.8+15.8+13=44.6 8Grease Fittings 2 + 2 + 2 = 6 2, 3, 9l IDxl.5ODMech.Tube 1 4.5+4.5+ 1+1 3,9

6 1.5+ 10,8 0.75=26 11 .1 ID x 2 OD Mech. Tube 1 .5+.5+1+1+1 + 1+1.25+1.25+ 1E, 2, 3,

1.25+1.25+1+1+1+1 = 14 91.5 ID x 2 O D Mech. Tube 1 .75+.75+4+4 + 1.25+1.25 1A,2, 3,

. +1+1+10=24 9Cast Bronze Bushings 2- 1" ID x 1.5" OD x 4" 10

_2 l " I D x l . 5 " O D x 3 " 101 "Dia. 4140 Steel Round Stk 1 13.1 101" Dia. Steel Round Stock 1 7+7=14 10BackHoe Teeth 3_ 8Back Hoe Teeth Holders 3 8Spindle & Hub 2 1" Dia. spindle & Hub to fit 71/4 x 4 3/4 x 4 3/4 Steel Plate 1 Cut into triangles 1ETrailer Coupler 1 Northern #1280 71" ID Pipe 1 4 10

10

MODIFICATION SECTIONTO BE USED IF YOU SELECTED A DIFFERENT CYLINDER....

MODIFY CLOSED-PIN CENTER-DISTANCEIf your cylinder has a different closed-pin center-distance, a slight modification to the boom and boomextension must be made.

For example:If your cylinder has a 24.25 inch closed-pin center-distance, the specified boom dimension of 62.5 incheswould have to be increased the difference times 2. (in this example, the difference is (24.25-21.5) =2.75, times 2 = 5.5, added to the specified boom dimension 62.5 +5.5 = 68. is the new boom dimension.

On Sheet 2, the 60" dimension would become 65.5 " [(24.5 - 21.5) x 2 = 5.5],the 27" dimension would become 29.75, andthe 30" dimension would become 32.75.

On Sheet 3, the length of item 1 would become 39.75, andthe 45" overall length would become 47.75.

On Sheet 1B, the 23.50 location diameter to locate the rear mount for the cylinder would become 26.25".Caution; With this change, insure the rod of the cylinder does not hit the boom pivot when the cylinder is

full extended. If this situation occurs, either bevel the corner of the boom pivot for clearance, or movethe 23.50" cylinder mounting location back. The correct location can be determined by trial and error.

DETERMINE ATTACHMENT POINTIn a similar manner the hydraulic cylinder attachment point shown on sheet 1E will have to be relocatedin relation to the change of the cylinder close-pin center-distance. NOTE: This attachment point shouldbe added to the frame close to the final construction phase.

DIMENSIONSDimensions are decimal, not fractions.

WARNING: To ensure the cylinder rod does not hit the boom pivot, the following process ofdetermining the attachment point of the cylinder must be followed:

Complete the frameComplete the boom pivot ;Assemble the boom pivot to the frameAttach the cylinder to the boom pivot cylinderExtend the cylinder fully

Move the boom pivot to the right until the cylinder rod is 0.25 inches from the comer of the boom pivot.The other end of the cylinder is now at the point that it should be attached to the frame.

If the comer of your boom pivot is too close to the cylinder rod the corner of the boom pivot, the comerof the boom pivot can be ground away to give the prescribed .25 inch clearance. Should the boom pivotstrike the cylinder-rod the cylinder will be permanently damaged.

Again, thanks for using CADPlans.

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