The CADDigger Model 728 was the first CADDigger and still is very popular. Similar to our other plans the 700 Series can be built by the homeowner, no machining necessary. The Model 708 fits the 2000 pound or larger Category 1 hitch equipped tractors. You power it from the tractor hydraulics or add a PTO pump. The Model 728 is a freestanding version of the 700 Series that needs no tractor. As a freestanding it can move itself around the worksite using the bucks or move the wheels to the opposite end and tow the Model 728 to the next worksite. The Model 710 is the Model 708 plus plans to convert the Model 708 to freestanding. In this form the Model 710 perfoms like the Model 728, self moving and convertible to a towable or 3 point hitch version. Up to seven feet of digging depth and a bucket width up to 14" makes these machines perfect for the mid size jobs. Low cost easily available components insures simple construction. The mid size of the 700 Series keeps your costs down and but still offers the longer reach of a larger backhoe. Most customers build at least 2 sizes of buckets. The buckets are easily changed by pulling 2 pins. This adds to the versatility of the CADDigger 700 Series. The drawings are easy to understand. CADplans has spent the time making the design of the 700 Series easy to fabricate. No micrometers or milling machines required. Simply cut and weld. The CADDigger 700 Series machine is up and running FAST! Your plans will also specify all of the valves, pumps and engines so your CADDigger will function properly without you having to "research" these components. To make your fabrication even easier, CADplans has arranged to have MetKit Corp. offer any or all of the materials and components you need to build your CADDigger. Buy some of the parts or the complete kit. You decide how to acquire the materials. MetKit even offers a steel kit with all parts precut and predrilled, ready for you to start assembly. MetKit Corp. can ship these kits by UPS direct to your home or business so you will not have to worry about how to get the materials to you. MetKit offers everything from the tires to the seat to make your construction simple. MetKit will even supply steel custom cut to your requirements so you can make the custom attachment you want. One of the best features of the CADDigger is the low cost. CADDigger typically costs 1/4 or less of a comparably sized machine. Since you build CADDigger you insure quality and should the need arise, you will know how to service anything in the machine. The large tires of the freestanding versions of the 700 Series lets CADDigger move easily around the jobsite. Other machines 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 the 700 Series is designed with thick section metals. This thick metal is easier to weld and gives the durability you need. Also the thicker metals gives you the machine weight necessary to keep the center of gravity low and insures no frame flexing occurs when you use your CADDigger. C A D D i g g e r N O T E : Reach is the distance the CADDigger can place the bucket straight out in front of the CADDigger. It is measured from the pivot to the bucket teeth on level ground.
SPECIFICATIONS:
708
728
710
HP WHEELBASE WIDTH AT STABILIZERS WIDTH WITHOUT STABILIZERS SEAT HEIGHT LOADING HEIGHT MINIMUM LENGTH FRAME LENGTH REACH DIGGING DEPTH RIPPING POWER LATERAL SWING OPERATING PRESSURE OIL TANK WEIGHT AS SHOWN WHEEL SIZE TBRE SIZE PUMP WIDTH OF BUCKET
TRACTOR POWERED N/A
7
TRACTOR OR PTO 6" TO 14"
122" 72"* 3 0 0 0 POUNDS* 1 2 0 DEGREES 1500 PSI* 3 TO 5 GALLON 1000# 14" OR 15" 2 7 " TALL 4GPM 6" TO 14"
7 84" 84" 31" 40" 64" 124" 84" 122" 72"*
CADDIGGER PLANS-
$119.95
$119.95
84" 31" 40" 64" 74" 32" 122" 72"* 3 0 0 0 POUNDS* 1 2 0 DEGREES 1500 PSI* TRACTOR OR 2 GALLON 800 #
N/A N/A
84" 84" 31" 34" 64" 120"
80"
3 0 0 0 POUNDS* 1 2 0 DEGREES 1500 PSI* 3 TO 5 GALLON 1100# 14" OR 15" 2 7 " TALL 4GPM 6" TO 14"
$139.95
Order by credit card, check or money order
*High Performance Upgrade Available The 700 Series Digging Depth, Ripping Power and Operating Pressure can be upgraded to 7 feet, 4000 pounds, and 2000 psi respectively with special High Performance cylinders offered by MetKit. Contact MetKit for details at 1-540-387-4995. Only the 700 Series machines are upgradeable in this way. Ask for the High Performance Option.
CADplans Corp- Your source for the plans you need to "Build It Yourself- When Only Tlie Be$t Will Do!"
CADDigger Model 728 Assembly Instructions
Disclaimer These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency to be met during construction, operation, and maintenance. Should further information be desired or should particular problems arise that are not covered sufficiently for the purchaser'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 customers solely to assist that customer in the construction of the equipment described. This document shall not be reproduced in whole or in part nor shall its contents be disclosed to any third party without the written approval 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 with provisions of any laws or acts. In no event shall CADplans liability exceed the purchase price paid for these plans and any legal actions brought against CADplans shall be tried in the state of Virginia, County of 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 Calls We have installed toll free line for ordering and brochure request only. For technical assistance or other inquiries please use our customer service number 540-992-4758 between 6:00pm and 10:00pm ET. Payments We must receive payment in full before technical assistance is available. If you received an invoice with your order, payment is due upon receipt. Replacements If the merchandise is found to be defective or damaged in shipment, contact CADplans for replacement items. Copyright . No part of this work, instructions, video, drawings, or photos, may be reproduced or utilized in any form or by any means, electronic or mechanical including photocopying, recording or by any information storage 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 the temperature a part remains, the less distortion will occur, but distortion will occur. Test fitting pins in holes will reveal distortion. The hand reamer recommended in the instructions makes quick work of the 1" holes. If a pin is stationary in a hole (such as the cylinder pin holes in the boom), precise fit is not always 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 and make the fit correct. Grind and ream as necessary to make the mating pin fit the hole. Don't scrimp on effort here, as a quality fit will result in a quality machine. Hydraulics Hydraulics hoses are usually least expensive pre-assembled in standard lengths. Use hoses rated 2000 psi min. working pressure or greater (not bursting pressure) Use the hose size that matches your components. Any hose 1/4" ID or greater is acceptable. Matching hose size to cylinders and the valve will reduce the number of adapters, which can cost as much as the hoses. Hose lengths are not given due to various components used, just insure the hoses are not stretched when the machine is moved through its travel. Only couple hoses with high pressure couplings. Parts available at the hardware store are not high pressure rated and can burst. The open center stack valve recommended is straight forward in design, (1) inlet, (1) outlet, and (2) connections for each cylinder. The inlet is the side with the pressure relief valve built in. If you reverse the inlet /outlet you will blow an o ring out of the valve or possibly have 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 Bearings Check for these at a store in your yellow pages under "Bearings". Be sure to get "finished" ID & OD as bronze bearings are available to "Rough Dimensions" with extra material for final finishing. Rough dimension bearings are OK if you have a lathe and want to turn the bearings for fit. Use care when pushing the bearings in the mechanical tube. Too much force pressing in the bearings will crush the ID, which will then require reaming. Use a hand grinder or a file to grind a groove around the bearing where the grease hole will be (See Fig. 2). This will insure grease can still get in the bearing if the bearing rotates. Bucket Teeth I have not recommended a specific brand of bucket teeth but just about any kind of small to medium tooth 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 a 130 degree angle to the leading edge of the bucket. Grind the back of the tooth to 30 degrees for relief so the tooth will cut. Hard surface weld on the front of the tooth increases the life of the tooth. One bead around the front surface is usually enough. Operating Tips Take your time learning to operate CADDigger. Notice CADDigger works by "clamping" earth between the 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 you encounter a rock too big for CADDigger to handle, dig a hole next to the rock and push the rock into the new hole. If you still can't move it, talk to your dynamite expert. Have fun with CADDigger and send me a photo when you get done.
CADDigger CONSTRUCTION CADDigger is buiit from the drawing package, photos and video. Carefully watch the video to help you learn special construction techniques and tips such as hole fabrication, bucket construction, and other features 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. Excellent hand reamers are supplied by ENCO (1-800-873-3626) such as: Item # Description Estimated Cost 3335145 Straight flute hand reamer S18.65 or 3335449 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 the material you find is undersize, on the ID, then you must ream to 1.002" ID and 1.502" OD. This can be done by hand if removing less than .015". An alternative to reaming the 1.50" inside diameter of the mechanical rube would be to reduce the OD of the cast bronze bushing so that it will fit in the mechanical tubing. This can be done on a lathe or by hand such as carefully reducing the OD with a belt sander and repeatedly checking for fit. Do not us a heavy press fit or hammer in the bushing as this will crush or reduce the ID and the pin will no longer fit. 1.5" OD x 1" ID mechanical tubing can be substituted for 2" OD x 1" ID. => Use high strength welding techniques such as 6011 or 7018 stick welding electrodes. Avoid lower strength 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 pivot comer. Insure the rod does not hit the pivot when the cylinder is fully extended. There are two ways to fix this situation if it occurs, either bevel the corner of the boom pivot for clearance, or move the 23.50" 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 components while tack welding. For example, when tack welding the boom, assemble the two cylinders to insure they are parallel to the boom. Also assemble the boom extension to insure the boom extension is parallel to the boom. This technique will insure the mating components will mate and are properly aligned. You can even move parts through their motion to insure they function prior to final welding.
CADDigger CONSTRUCTION => Anchor pivot pins. Pins on the main pivot and boom must not turn or excess wear will result in the steel 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 what CADDigger is designed for. The pin can be cross pinned. To do this, extend the mechanical tube 1/2" on one side (remember to order extra if you do this), drill a 1/4" hold through the mechanical tube and the pin, and drive in a 1/4" x 2" roll pin. Pins that rotate very little, such as the rear pin on the boom extension cylinder and the bucket curl cylinder, can use a welded pin, cross drilled pin or a bolt & nut. If a bolt is used in any pin application, make sure that clear bolt (no threads) ends up against the inside of the mechanical tubing. The 4140 pins on Sheet 10 can be substituted with grade 8 or 9 bolts. The bolts you obtain must have a good quality finish so they will run smooth inside the bushings. Use caution welding the pins. High strength materials must be welded with low hydrogen rods to eliminate cracking. INSTRUCTIONS: STEP 1 => OBTAIN HYDRAULIC CYLINDERS. * Obtain your hydraulic cylinders prior to construction of the boom or boom extension. The closedpin 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 during assembly 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 the outrigger and outrigger support. Special note: several holes can be drilled in the outrigger support to allow CADDigger to be adjusted for operation on uneven terrain. This compensates for not having hydraulic 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 horsepower engine 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 that matches the width of the end mounting of the cylinders that you acquired. STEP 7 => FABRICATE BUCKET Sheet 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 wider bucket will require more force to push the bucket through the soil. For heavy clay type soils the 14 inch wide bucket depicted is the maximum recommended for general excavation. The corn cutter blades shown on sheet 8 were parts that were available at the time CADDigger was constructed. If you don't have a source of these, they can be replaced by other high wear resistant materials such as snow scrapper blades, or other high carbon steels. The straight section of 14" plowshares can be successfully substituted. Use care in welding any of these high carbon steels as cracking and embrittlement can occur if 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 of sloppiness 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-highpressure 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 exceed 1500psi. The CADDigger depicted in the video operates at approximately 1200psi hydraulic pressure.
Read Before Beginning Construction Material, Tools, & Techniques Power and versatility in a small economical unit makes CADDigger a desirable machine to own. The machine can perform digging tasks better than a farm tractor, yet doesn't disturb the soil like large machines. A great deal of time was spent developing CADDigger so it could be built with only a few metal working tools. Mechanical tubing is a heavy wall steel with a precision inside diameter. It is not pipe. Using this material, you cut a piece, weld it in place and have a precision hole. Weld two aligned with a pin and you have an assembly only a very big machining center could produce. Those customers who have the machines available to them can weld bar stock in place, lay out the holes, and drill & ream the holes to produce CADDigger. This is a successful technique, but CADDigger was designed for the home owner without machines or machining skills. The only tools typically need to produce CADDigger are a welder, (stick preferred), bandsaw, electric drill and hand tools. Other tools are helpful, but not necessary. If you have other tools and know how to use them, do apply them to CADDigger. The techniques used are the latest applied by equipment manufacturers. Low tensile strength castings are being abandoned for steel fabrications. Steel is a very forgiving material to work with allowing you to cut and drill with little practice. Unlike castings or wood used in other projects, steel can be easily repaired should you make a mistake. And since the parts are so simple, don't feel bad about abandoning a 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 time hydraulics were applied to a shovel man knew this was the way to dig. This must be remembered when building CADDigger, the joints and assemblies are subjected to high forces. Take your time during construction, 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.)
45 degree angle
Full Fillet Weld Leg Length
Take your time when cutting parts with the bandsaw. Increasing down pressure to increase cutting speed causes premature blade failure and crooked cuts. The more precise your parts are cut the easier your assembly will be. Torch cutting and abrasive wheel cutting can produce good parts in the hands of skilled craftsman, but the bandsaw produces quality parts almost all of the time. 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, obtaining squareness will be difficult. If the machine is not square, it will not dig properly and will not tow straight 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 equivalent 2.5" bore. 14" or 14.5" stroke. 21.5" retracted length. HYDRAULICS: CADDigger is designed to operate using open-center-hydraulics. This ensures that the pump continuously moves oil through the open-center of the valve body as long as the motor is running. Oil flows 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 FILTER Northern 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 return lines of the reservoir are under the oil in the tank to ensure foaming does not occur. Use a breather on the reservoir that has a filter in it to ensure dust is not drawn into the tank reservoir because each time one 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 the weld 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. The higher 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 are recommended due to cylinder size and speed of operation. Larger engines may be used, but, no greater speed or power will be achieved with CADDigger. The CADDigger shown in the video is 7 hp. Use care when operating with engines larger than 8hp because the higher horsepower engines develop high hydraulic system pressures. You will bend parts of CADDigger using large engines and high hydraulic system 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 enough to ensure the boom can swing through its complete travel both side to side and up and down. Select hoses with fittings that will attach to both the cylinder and to the valve body. The best size hose is that which 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 1-800-488-3407 Northern 1-800-533-5545 Steels: Metco Supply 1-800-521-8811 Tools: ; ENCO 1-800-873-3626
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Raw Material Requirements- Model 728 Material Description
Qty #
Requirements in Inches*
Referenced
* Allow extra material for cuts or modifications
Sheets
1
2 x 2 x 1/4 Square Tube 2.5 x 2.5 x 3/16 Square Tube 3 x 3 x 3/X6 Square Tube 3.5 x 3.5 x 3/16 Square Tube 4x4x3/l6SquareTube 2.5 x 2.5 1/4 Angle
24+24+20=68 7 72 + 14+14+29=129 1A, 1B 61 + 37 + 36+36+19+19= 214 1A, 3,6 31+10.5+8+8 = 57.5 1A, 6 62.5 2 28 1A
1 1 1 1 1
3" Channel 1
1 1/2" Schedule 40 Pipe 2" Schedule 40 Pipe 1/2 x 2 Steel Bar 1/2"x3SteelBar 3/8 x 2 Steel Bar l/4x 3 SteelBar 1/4 x 3 1/2 Steel Bar l/4" Tread / Diamond Plate 1/4" Steel Plate 5/16" Steel P I a t e 1/2" Steel Plate
1/2x3 High Carbon Steel Grease Fittings l IDxl.5ODMech.Tube
20
1
1.5 ID x 2 O D Mech. Tube Cast Bronze Bushings 1 "Dia. 4140 Steel Round Stk 1" Dia. Steel Round Stock BackHoe Teeth Back Hoe Teeth Holders Spindle & Hub 1/4 x 4 3/4 x 4 3/4 Steel Plate Trailer Coupler 1" ID Pipe
13.5+9.5=23 1B 13 8 9+9+11+11 =40 11 10.5 + 14+14+9+9 =56,S 1C,3,8 5+5+5+5 = 20 1E, 9 5+2+2=9 9 12+12=24 2 24x34 1A 13x36 8 21.25x13.5 8 : . .16.5.x10. 12 x 12 2,3 11x11 1A 8x8, 8x10 6 14x9.5, 4.5x10, 4.5x4 9 15.8+15.8+13=44.6 8 2+2+2=6 2, 3, 9 4.5+4.5+ 1+1 3,9 1.5+ 10,
1 1 1 1_ l 1 2 1 2each 2 2each 2each 1 1 6
8 0.75=26 11 . 1 ID x 2 OD Mech. Tube
1 1 2_2 1 1 3_ 3 2 1 1 1
1B
.5+.5+1+1+1 + 1+1.25+1.25+ 1.25+1.25+1+1+1+1 = 14 .75+.75+4+4 + 1.25+1.25 . +1+1+10=24 1" ID x 1.5" OD x 4" l"IDxl.5"ODx3" 13.1 7+7=14
1"
10
1E,
2, 3, 9 1A,2, 3, 9 10 10 10 10 8 8 Dia. spindle & Hub to fit 7 Cut into triangles 1E Northern #1280 7 4 10
MODIFICATION SECTION TO BE USED IF YOU SELECTED A DIFFERENT CYLINDER.... MODIFY CLOSED-PIN CENTER-DISTANCE If your cylinder has a different closed-pin center-distance, a slight modification to the boom and boom extension must be made. For example: If your cylinder has a 24.25 inch closed-pin center-distance, the specified boom dimension of 62.5 inches would 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, and the 30" dimension would become 32.75. On Sheet 3, the length of item 1 would become 39.75, and the 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 move the 23.50" cylinder mounting location back. The correct location can be determined by trial and error. DETERMINE ATTACHMENT POINT In a similar manner the hydraulic cylinder attachment point shown on sheet 1E will have to be relocated in relation to the change of the cylinder close-pin center-distance. NOTE: This attachment point should be added to the frame close to the final construction phase. DIMENSIONS Dimensions are decimal, not fractions. WARNING: To ensure the cylinder rod does not hit the boom pivot, the following process of determining the attachment point of the cylinder must be followed: Complete the frame Complete the boom pivot ; Assemble the boom pivot to the frame Attach the cylinder to the boom pivot cylinder Extend 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 comer of the boom pivot can be ground away to give the prescribed .25 inch clearance. Should the boom pivot strike the cylinder-rod the cylinder will be permanently damaged.
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