Allis-Chalmers G Service Manual Download

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Summary of Contents for G

Page 1: ...T T I _ MODEL G TRACTOR Allis Chalmers Mfg Co d TRACTOR DIVISION MILWAUKEE WISCONSIN U S A CU 279 Xl ...

Page 2: ...te Generator Delco Remy Governor Continental centrifugal Ignition Delco Remy distributor and coil Lamps Guide Lamp Oil Filter Own Radiator Perfex or McCord fin and tube Radiator Cover Spark Plugs Auto Lite AN 7 Starting Delco Remy Data H P Neb Test No not tested Number of plows recommended One 12 in Engine Continental N 62 2 x3 1800 r p m 4 cylinders L head cast en bloc Piston displacement 62 cu i...

Page 3: ...ne may be removed as a unit The engine must be removed to do any repair work on the dutch throwout bearing flywheel or oil pump The engine and clutch housing may be removed as a unit if the differential is to be removed or the transmission dismantled Removal of the complete engine assembly or of the clutch housing must be a e if the belt pulley drive gear or engine intermediate gears need ser vIcI...

Page 4: ...LTER FUI L TANK GF AR SHIFT GF NF RATOR GOVF RNOR GOVERNOR WEIGHT ASSEMBLY HOOD HOOD SUPPORT HYDRAULIC PUMP IGNITION SWITCH INTF R MEDIATE GEARS LIGHTS LIGHT SWITCH LOW GEAR SPECIAL MANIFOLD OIL SEALS FRONT REAR OIL PUMP OILING SYSTEM OIL PRESSURE RELIEF VALVE PISTONS RINGS RING GEAR FLYWHEEL RADIATOR RE I L WHEEL AXLE HOUSING SPF CIFICA TIONS STARTER STEERING GEAR SPARK PLUGS SPECIAL LOW GEAR TIM...

Page 5: ...OB 3Zc OZO 18 to Z3 Microfarad Battery distributo Clockwisl Mark Advance 3 1 Z 1 5 Bottom 1 3765 001 Piston Clearance OOZ Rebore at 010 or mure Ridge Remove if replacing Rings or bearings Needle 8earing Pivot Ball Spring free length Speed Range Gear 8acklash Maximum Cam Angle Point Gap Condensor Type Drive C rank Pulley Timing Advance Auton1atic Hunning Advance GOVERNOR Oil 8ath 1 2 pint 1 3 4 1 1...

Page 6: ...t Iron Oversize Rings 020 040 Not to be used until block is rebored 5433 to 5435 003 and 005 Light push fit Very light push fit 0003 loose or noisy 14 M M 025 A C 45 or autolite AN Size Point Gap Intake Tappet Clearance 01 ZIt cold Roto Exh Tappet Clearance 01 Z cold Timing Marked gear Inlet Opens T D C Inlet Closes 350 after B D C Exhaust opens 40 before B D C Exhaust closes T D C Seat Angle 450 ...

Page 7: ...ximately 13 amp Low Rate approximately 3 amp Starter De1co Remy 6 volt Under Rear Axle Under Drawbar FAN 17 3 8 13 POWER Drawhar Belt Recommended Load RADIATOR Type Operating Pressure Capacity TRANSMISSION 8 00H P 10 5 H P 12 plow Pressure Tubular 7 Ibs 6 1 2 qt Type Size Blades F an Speed at 1800 engine R P M Ratio Crankshaft to fan pulley FRONT AXLE Castor Camber Steering Toe In FUEL SYSTEM Suct...

Page 8: ...The pulley may be removed irom the shc fi with the same tool This wo k naybe done more satisfactorily if a presE is available Inspection Inspection of th fiiIl may b acco l l li d G 7 without removing it from the engine Check the bearings for wear and roughness They should not be rough or worn more than 006 1 Check the fan belt sheave contact surface for wear caused by the fan belt If the wear in ...

Page 9: ...nd will be hottest on the days when the outside tempe rature is hottest This system is automatic and the speed of circulation varies with the difference between temperature of the radiator and the water jacket of the engine The engine will operate at a temperature even in the coldest weather which tends to pre vent the formation of condensation in the crank case 1 the engine should overheat check ...

Page 10: ...om the drawbar pivot pin Remove the four capscrews attaching the drawbar guide to the cylinder block anti re move the guide Remove the cotter pin and G 9 For engine removal remove drawbar guide and swing drawbar to one side ...

Page 11: ...he light switch is n lounted on the instrument panel which is located under the engine hood and is attached to the front fan bracket The light sw h incorporates the generator con trol which is of the two step system having a high and low charging rate The fuse for the lighting system is also mounted on the light switch A fuse of either a 10 or 15 amp capacity can be used The operation of the light...

Page 12: ...ut With this extra extension it is possible to replace the head light wire without any difficulty HEADLIGHT AND TAIL LIGHT Both lights use single contact 6 8 volt bulbs The headlight is 32cclndle power and the tail light is 15 candle power With the single con tact bulbs it is necessary to have all the lamps and tractor parts which are used to complete the circuit clean bright and tight Dull reflec...

Page 13: ...ed ReITX val Remove the carburetor air inlet pipe the choke rod and the fuel line Disconnect the carburetor link rod to the governor Remove the two capscrews attaching the carburetor to the intake manifold Inspection Inspect the choke shaft and throttle shaft for wear in the body Any wear at these points will allow the entrance of dirt to the engine and cause uneven operation at low speeds Check t...

Page 14: ...uld be fiat and smooth and the belt should not bottom in the sheave If the belt is grease soaked deteriorated or broken it should be replaced AssemblY Check the fan belt tension opposite the gen erator pulley on the straight side of the belt The belt should move in or out approximately one half inch from the straight line In sufficient tension causes belt l lippage or excessive tension places an o...

Page 15: ...support Hold the dis tributor with the coil wire terminal pointing toward 1 spark plug and the rotor pointing towards the clip farthest from terminal Enter the distributor into the engine block in this position As the distributor enters the block and the gears mesh the rotor will turn slightly in a counter clockwise direction Clamp the distributor in place partially and turn the distributor body i...

Page 16: ...over Assembly If the needle bearing has been removed it should be replaced with a new part anc pressed into place Install the lever and shaft assembly in the timing gear cover using a newdust seal Be sure pivot ball is in posi tion At any time when the timing gear cover is reznoved a new crankshaft oil seal must be used Tighten the timing gear cover capscre l to 15ft lbs torque To adjust the gover...

Page 17: ...and be sure it is clean and free of any foreign material If this hole becomes plugged the governor wl1lbe inoperative due to the vacu um created behind the thrust cup shaft Check the governor weight for wear on the riser and any wear at the hinge points The assem bly should be replaced if the hinge pins are worn more than 006 CYLINDER HEAD Removal Remove the hood and hood support carbu retor air i...

Page 18: ...e the drawbar guide Remove the starter and choke rods and the battery cable at the starter also disconnect the headlight wire The engine may be supported from the fan shaft bearings however do not hook in such manner as to pull bear ing brackets closer together or to place a strain on shaft It is best to use a solid bar as shown or a spreader must be placed between the chain ends close to the fan ...

Page 19: ... 007 The clearance itmst be checked with all parts in place including the crank jaw which is used to retain the thrust washers in position It is best to check end clearance before dis assembly It will not be necessary to dis mantle the engine to adjust end clearance until such time as it is increased to 011 However if the engine is downfor any other reason the end clearance should be adjusted to t...

Page 20: ...rrespondingly and these marks should face the camshaft side of engine the regular oil sump capscrews are used in the center hole of the rear oil seal retainer If an extra long capscrew is used on this position it will force the seal away fron1 the retainer OIL PUMP Removal Remove the engine from the tractor and remove the clutch and flywheel The pump is mounted at the rear of the engine bloc and i...

Page 21: ...t Drain the oil and remove the oil sump Remove the cylinder head and the valves Remove the crankshaft fan drive pulley and the timlng gear cover Removethe distributor Remove PULLING CAMSHAFT GEAR Check the openingbetween the center of the front cam journal and the oil hole leading to the thrust plate Check the shaft journals cam lobes andcamfollower faces for wear or scoring H scored they shouid b...

Page 22: ...e gauge face is approximately 15 pounds The pressure may be regulated by placing washers between the spring and the retaining plug Removal rHAUSTVAa INTAKE VALVE r _ KEEPERS _ r GUID 1N SPRING INTAKE RETAINER I I EXHAUST 10 RETAINER I fL OJusnNG1 lJ SCREW lOCK V T VALVES der head Remove the distributor the throttle rod and the carburetor and the valve cover Use a valve lifter or spring compressor ...

Page 23: ...arance ls set to 012 WiWpi e engine cold Exhaw i valves with t oto cj ps are set Ol 2 With engine old Thesevalves inust be f ree to rotate The clearance 1 een cap dstemis 004 to 006 C I To set the tappets it is necessary to have a The valve guide is 1 21 32 long and should thin jawed 7 8 tappet wrench that will work be driven into the cylinder block until it is between the adjacent tappets without...

Page 24: ...in which it will 1 The piston pin S fitted ith W light push installed to Jttt surethat it is free fit in the connecting rod and light push fit The lowest pb rtion of the c ylinde I bore 1S in the piston They should be replaced when chamfered 450 to permit installation of the 0003 loose or wnennoisy j f ft _ rings without the need of a ring cr rnpressor Pistons and rods must be installed from the T...

Page 25: ... pump which is mounted at the rear of the camshaft and is driven at camshaft speed The oil from the pump is forced under pressure into the oil gallery which is located in the cylin der block between the camshaft and the crankshaft The oil pressure relief valve is located at the rear end of this gallery The oil pressure relief valve prevents ex cessive pressure from beins developed in the o Uing sy...

Page 26: ...ning for wear It should be replaced if the lining thickness a pproaches the rivet heads Check the lining and the hub for loose rivets Check the hub for worn splines Check the face of the flywheel and the face of the pressure plate for flatness These parts should no tbe warped Check the release lever for wear at the hinge pins and wear at the throwout bearing contact surface Also check the adjustin...

Page 27: ...ck from the idler gear shaft and pull shatt from clutch housing Remove th oil sl4 1ger from the clutch shaft gear end Remove the retainer from the clutch shaft bearing The shaft may then be pulled toward the flywheel and removed from the case The third gear in this assembly will remain on the main transmission shaft where it is retained by two snap rings The idler gear is mounted on two needle bea...

Page 28: ...e the fly wheel ring gear from the flywheel unless the starter teeth are damaged The flywheel is G Z7 balanced and no drilling or machining should be done to the flywheel Check the clutch surface for flatness AssemblY Heat the starter ring gear to 5500F and in stall on flywheel with the beveled end of the teeth toward the flywheel end of engine The starter ring gear has 86 teeth and the starter pi...

Page 29: ...e NC and 5 8 female NF in place of the 930J leg ends To replace oil seal or bearing pull the bearing clamp ring from the axle shaft Inspection Always use a new oil seal Check the brake drum for scoring Assembly Place the oil seal on the axle with the lip towards the bearing Place bearing cn the axle with the shielded side away from the seal Pack the bearing with chassis lubricant Install the bear ...

Page 30: ...seal lip towards axle flange Place the large diameter spacer on axle with the inner curved radius towards the seal Install bearing and bearing retainer Install the axle in the housing being sure the seal is pressed against the counterbore If seal is not seated properly the seal lip will ride up on flange radius damaging the seal Place the smaller drum spacer on axle with square side towards drum H...

Page 31: ... NOTES ...

Page 32: ... iden tified by the cutout section in the cam surface The lining extends to the lower end of shoe There are two holes in the lower end of shoe One of the se the top is used to attach the shoe return springs BRAKE PEDAL ADJUSTMENT When new pedals are installed the pedal stops must be filed to stop the pedal approxi mately four inches below the seat attaching pad and to have the pedals level with ea...

Page 33: ...nds the hazards of such work and has the facilities to reduce the hazards to a minimum FILTER BAIL FUEL FILTER Shut off the fuel cock under tank and remove fuel line carburetor and fuel filter Clean the filter thoroughly The filter is a felt element and is very effective If it plugs rapidly it indicates better methods of fuel handling should be employed Install the felt element with the web side u...

Page 34: ...inions and side gears and thrust washers and thrust washer surface in carrier for scoring Al ways use new oil seals Assembly If a new ring gear is riveted to the carrier it should be cold riveted Place the side gears and pinions in carrier Rivet the pinion shaft keeper pin by distorting end of hole The gears should have about 005 backlash or turned or caused to revolve with a lever not more than o...

Page 35: ...haft bearing adjusting nut to remove gear The shifter rod and detent ball may be removed by removing the main shaft bearing retainer and pulling the assembly from the transmission case Slide the shaft from retainer placing the hand over detent ball and spring to prevent their loss TRANSMISSION BEVEl PINION SHAFT Removal Separate engine and clutch housing assembl from transmission case Separate tor...

Page 36: ...t then the bearing and retaining nut Adjust the bearings to a slightly pre loaded fit 8 ounce ft Lock the nut by driv ing a portion of the thin section into the key way of shaft Tractors without the special low gear will have a spacer to take the place of the gear The main shaft is installed from the front of case placing the gears on shaft as it enters case Install the rear bearing and the low sp...

Page 37: ...er slots in both forks The edges of guide may not be worn excessively 1 either case exists the guide worn excessively or guide not lining up it may be possible to shift into two gears at once Assemblx The third speed shift rail can e identified by the three notches The two front notches are very close together The notches are at right angles to the retaining pin hole The third speed fork has the h...

Page 38: ...ousing Install jacket tube with the notch in lower end up to prevent grease leakage Adjust the length of tube to reach into recess of steering wheel It must not touch wheel or it will cause binding Back out the lever shaft adjusting screw and install lever shaft and cover Count the num ber of turns from full right to full left then turn back half these turns to mid position At mid position adjust ...

Page 39: ... reamed after pressing into place The toe in adjustment of front wheels must be made each time the axle is repaired or wheel spacing changed The toe in is 0 to 1 16 0 FRONT WHEELS Removal Raise the front wheel from floor and block solidly Remove the hub cap key and nut from axle Pull wheel Pull inner bearing and oil seal The bearing cups may be driven from hub Check the bearings for wear chipping ...

Page 40: ... 0 0 37 ...

Page 41: ... I e I rCONTROl A VALVE WI COVER STUD JIll J I 1 DRIVE GEAR PUMP BODY ii PLATE 1 _ THRUST 0 _ J WASHER SHIFTARM r 8USHING LUG G BEVEL DRIVE GEAR _ SEAL RING I GASKET INTAKETUBE Q G I t l vr fl oQ SHIFTER BEARING SHAFT NUT SHIFTER PIN GASKET C I Q HYDRA ULIC PUMP c o I ...

Page 42: ... clutch pedal and move shift lever towards rear of tractor Pwnp Removal Disconnect the ranl hose or hoses remove con trol linkage remove capscrews attaching belt pulley assen bly to tractor Remove the pulley and pinion assembly The surfaces of the pwnp body gedr plate and pulley housing are lap fits and mated together with dowel pins No gaskets are used Use great care when separating the se parts ...

Page 43: ...press bevel gear on shaft having 5 8 holes dnd 1 4 dowel pins Stdrt The idler gear should turn free without exc es the capscrews and tighten evenly to 30 ft lbs sive end play Pldce roller bearing in housing Enter shaft assembly and place shifter and pi ns in position Place ball bearing in position with long side of bearing from snap ring towards the gear Tighten shaft nut securely and 10C k by dep...

Page 44: ... and the oil seal with lip towards pinion end of shaft Adjust bearings to a free rolling fit without end play or binding Lock the bearing adjusting nut by punching a section of the thin flange into the shaft keyway Install the seal cap over nut Place the bevel gear in case and press shaft in against shoulder Install bearings and re INSTALLING SHAFT tainers Adjust bearings to a free rolling fit wit...

Page 45: ...Allis Chalmers GU ...

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