T -~" ,. ..•.... T -.I ! _. MODEL "G" TRACTOR- Allis--Chalmers Mfg. Co. TRACTOR DIVISION d> - MILWAUKEE, WISCONSINU. S. A. .
·. ~. ALLIS-CHALMERS MANUFACTURING CO. Milwaukee, Wisconsin Allis-Chalmers Allis-Chalmers Model "G" HD19H ALLIS-CHALMERS MODEL "G" Allis-Chalmers Mfg. Co., Milwaukee, Wis.- 1948-1958 1948 Air Cleaner: Donaldson, oil bath. Battery: Auto-Lite. Brakes: Two, operated by foot pedals. Carburetor: Marvel-Schebler, % in. Clutch: Rockford, single dry plate. Generator: Delco-Remy. Governor: Continental, centrifugal. Ignition: Delco-Remy, distributor and coil. Lamps: Guide Lamp . . Oil Filter: Own.
" SERVICE MANUAL FOR THE tv«:>DEL ''0'' TRACTOR 1 The {'ngine for the model "c'· tractor is mounted in the rear of the tractor. For purposes of identification, the engine will be referred to as crank end. flywheel end, manifold side and generator side. The No. I cylinder will be at the c rank end of the engine. The design of the model "C'· tractor lends itself to a variety of procedure for following practical repair work.
MODEL "G" TRACTOR INDEX G SECTION ·SUBJI-.CT AIR CLEANER A t-.1t-.tF: Tl:'. R 8 SPECIFICATIONS 3 11 BATTF.RY nf-~l.T PULU-;: Y (' . .~. "" -'~. ~ 40'·; 19 19 lO . BRAK~:S BRAKf>PFDAL AD] USTMENT CAMSHAr'T .f:ARBURETOR CONNF.CTING ROD CLUTCH CI.UTCH HOUSING CLUTCH HOUSING & ENGINE REMOVAL C l.UTe H THROWOUT BEARING 81 FORK CRANKSHAFT CRANKSHAFT OIL SEALS CYLINDFR HEAD DIAGNOSIS OF TRACTOR PROBLEMS DlFFFRFNTlAL DlST HIBUTOR DHAWBAR fo~NGINF. F'.NGINI: OILING SYSTEM 1'~NGINr: RE:.MOVAL I-:l.
SPECIFICAI1Ul"" ENGINF: F:NGINF. CRANKSHAFT Type C>'linders. Bore Stroke Piston Displacement },',nginc Speed Full Load r~ngine Speed High Idle Fngine Speed Low Idle Conlpression Ratio Prior to (....ng. l3988 I·:ff. On Eng.l3988 Firing Order Rotation Conlpression Pressure (Starter Speed) L-Head 4 cycle 4 2-3/8" 3-1/2" 6l Cu. In. 1800 H.P.M. 2100 R.P.M. 500 R.P.M. 5-3/4 to 1 5-5/b to 1 1-3-4-2 Clockwise 90 to 95 lbs. Oil 8ath 1/2 pint Type Capacity CAMSHAFT CONNECTING Adj.
ENGINE SPECIFICATIONS OIL PUMP PISTON Gt>ar Backlash .001" to' .002" fv1axinmnl Gear Backlash .005" .004" Tooth Tip to Body Gear end clearanCE: .004" Drive Shaft Clearance .002" to .
CHASSIS SPECIFICATIONS r fO r 1i BELT PULLEY GENERAL DIMENSIONS Optional Equipment Tires Location Left Side Speed 1950 at 1800 of engine Ratio Pulley to Engine 1.08 to 1 High Idle 2275 R.P.M. ~ize 6" dia. 4" face BRAKES Internal Tire Pressure expanding Diameter 15 lb. 12 lb. Front Rear 7" CLUTCH Type Size Springs 4 :00 x 12 6 x 30 Front Rear Wheel Spacing - free length Thermo ELECTRICAL 13" 6 volt 70 ampere hr. (Delco-Remy) 2 charging rates High Rate approximately 13 amp.
F:':'NGI~~HOOD AND HOODSUPPORT Removal -0 portion of the hood support at the crank end of the engine. Remove the tail light from the hood support. The hood and hood suppc·rt IndY be' removed together if the, capscrcws, attaching the hood to the radiator are removed and the two short capscrews, spal..ers,' the oue long capscrew and spacer are removed from the lower If the"hood alone is to be removed, the bolts Inust be removed from the hood at the top of the hood support • .ELili...
;."jJ::,'i.' -4;"-;; "H}Q :~~)_!.~:i-$ .. 5!1j' lr> '{f--iC ~~ -J l:::~d 16\,<:u.T~~" _-, •....;~~ 'R~moval., . ............--- .•.. .oj;; , L~16<>ien1;Oi'e ~'hos ec onri'ec t-i 0'0 S"'the ,>:: twfivitufst:Jiltt"iCc h"ihg:~the1ai'i4 inlet ~lii:pe't:s'upport io~tn~;:ytirider;·Il~'cid.;' Removeit~e'lW~l%::;ai:lii,~h- ~1::.F;' ~.hp~~. ~tij ~;. qo:! ~ng~~'[arJ!;dE!ane'r'Dodrto~fHe'r'€~f;ra-c ket. , ~'- ..:,;.
DRAWBAR Removal nut from the drawbar pivot pin. Remove the four capscrews attaching the drawbar guide to the cylinder block anti remove the guide. Remove the cotter pin and For engine removal, remove drawbar ·guide and swing drawbar to one side. ~.
EU':CTRICAL SYSTEM ~,"--.j ...• RED TR. CUTOUT RELAY HEAD LIGHT CONNECTOR TAIL LIGHT - } WIRING DIAGRA III - Discharge side of anlmeter to cutout. - Resistor to generator field terminal. 1/3 - Ignition switch to coil to primary distributor lead. #4 - Light switch to headlight & tail light. H5 - Change side of ammeter to starter .• 1/6 - Generator armature terminal to cutout relay. #7 - Discharge side of ammeter to fuse. #8 - Discharge side of ammeter to ignition switch.
r !-n which is cut into or out of the circuit and limits the arnoWlt of electrical current allowed to pass ttnough the field coils of the genera: tor. The generator charging rate is approximately 3 amperes in low position and 13 amperes in high position. IGNITION SWITC H The ignition switch is also mounted on the instrument panel and is used to complete the ignition circuit.
STARTER .;' Removal " lnspectio Ch(~ck the battery terminals for cleanliness and tightness. All connections must be clean :c·_:.:' and tight. lri~cold \,veatner ifthe Marte'i'does nof enga'ge the flywheelprornptly ,''the :starter drive screw threads should be washed out with kerosene. ,Do not lubricate the starter drive threads but the -.'.kerosene ~.. as .-. the only lubricant. . :leave ~ n . . See the general section of the service mimual for details on the starter.
FAN BELT Removal Loosen the generator brace and move the generator closer to the cylinder block. Remove the upper right capscrew and spacer attaching the hood support to the cylinder block. I i Inspection Check the belt and the condition of the sheaves. The sheave side should 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.
DISTRIBUTOR ••..• -.-- ..- ,.. ,.::.. ~.: '. -: '. -.- ,, .-t--- . .~~. .....•... --- .. ',~!.~;~, DISTRIBUTOR CAP ;;~~~;~J :,', ' .. ., j ,/ .__rP,' " t,: .''.., ~.'.~ ~ CONDENSOR - -'-- ---' -_. Removal Remove th~ spark plug wires and coil wire wire from1:he top of the distributor. Disconnect the; primary coil wire from the coil to the side' of the distributor. Loosen the clamp screw at the base of the distributor and pull distributor up out of engine.
TIMING GEAR COVER r rO r Removal Remove the hood and hood support. Disconnect the carburetor link rod and the governor spring. Remove crank jaw. Use twc 3/8" caps crews and pull crankshaft pulley as shown. Do not run cnpscrew throug}; against die cast cover or pry against cover as it may be easily damaged. r Inspection See "governor" and oil seals. Assembly- -- Tighten capscrews "--- to 15 ft. lbs. torque. --~.
the screw should be turned in slowly until surging is overcome. If the surge screw is turned in too deeply, it will increase the r.p.IX1oat which governor action takes place. This increase would be from low idle to a maximum of 700 r.p.m. Governor Weight Assembly Removal Remove the timing gear cover and the governor thrust cup assembly. Remove the governor spider and weight assembly from the timing gear. Inspe-ction The governor thrust .OOZto cult assembly fits the camshaft with from .004" clearance.
OIL SUMP Removal oughly and inspect the screen for broken mesh Remove the drawbar guide and swing the drawbar to one side. Drain the oil sump and remove the small cover over the lower portion of the clutch housing. Remove the capscrews attaching the oil sump to the cylinder block. Assembly. Use a sealer on the one side of the gasket surface only. Tighten the end capscrews which enter the die cast timing gear cover and rear oil seals to 15 foot pounds torque.
CRANKSHAFT . , .,: ;::1 •• PUlLEY SEAL INSERT LOWER ~-.) .'"..~ PULLING CRANKSHAFT GEAR size the undersize bearings should be used for service. Check the end of the crankshaft at point contacted by oil seal and the crankshaft pulley at point contacted by oil seal. If worn excessively at either place, they should be replaced. The end clearance of the shaft should be maintained within .003" to .007".
T T the bronze washer •• 002" and .008" shims are used between the steel thrust washer and the shoulder on the crankshaft to adjust the end clearance. Either the shaft tnust be removed to adjust end play or a special puller used to remove the crankshaft timing gear. When installing the crankshaft, the crankshaft gear must be meshed with the camshaft gear according to the marks. There is one mark on the c rank gear and two on the ~am gear. Place the single mark between the double mark.
per square inch and can be obtained by ad-"_"",; justmentof theoi! press~e reliefvalve-. '00- _ ._ not atter.1pt to adjust low oil pressure·by-use, ':' . < of the pressurereUef valve until all other sources 'of low oU-pressure -are, investigated. - , : ~...> ',. ~ :~ ".:.::1'. ," r:·: .; CAMSHAFT!. :.:. ~t·"'1; ..- the governor spider assembly and pull the camshaft timing 'gear • 'Remove the cam' shaft thrust plafe and pull the camshaft from the.engine.
r OIL PRESSURE RELIEF VALVE I It may be removed by use of a heavy duty screw driver. Beneaththe plug is the spring and plunger asserrbly. Inspection Check the relief valve spring for its free length, which should be 2". The spring is painted red for identification. A neoprene seal is used on the plug to prevent leakage. Assembly Removal T The oil pressure relief valve is located on the flange of the cylinder block near the oil pump.
in order. ·to.pre_v~nt distortion of the guide driven from the cylinder block.is necessary. Always use a suitable driver. ~ Ins~ction .' .', is collapsedrit;wilLbe necessary. to.rearn.,._ .•... ,."':,' the ~~_~ZJ~te"r...:;,t~~ ..guides are in pl~,~"':l;>~.;.: • a 45 cutt~r.!to·~eseat the. valve seat~·,·,Us~, The valve face and seat angles are 450• The seat width should be approximately 3/64" and.. not over 1/16".
marked on the piston top. T he a lWTIinurn piston-";;~d-N62-'jil7:i '~d;b~ve T'he camp'r'es'sio'n 'rings ·6f'the tractor s are tapered and have a small pit mark: on tht' top is cam ground. When fitting ca'ffi ground side. The standard size service ring set will pistons use; a .OOZ" feeler strip I/Z" wide plated top compression between the cam or tight side of cylinder .~~ll •.. .. consist,of·"'.chromium ~'ring ttiat ~ij~;nl?t be tapered and tilt' spcond With feeler strip in place at tightesU)oint,:.
ENGINE-OILING SYSTEM ,l' 0- The Model lti" engine use. regular srade lubricating oil of the followinS specifications: The oil is drawn from the oil sump through the intake screen and pipe to the oil 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 cylinder block between the camshaft and the crankshaft. The oil pressure relief valve . is located at the rear end of this gallery.
.•... journal. This hole lines up with the two notches cut in the camshaft thrust plate allowing two spurts of oil from each revolution to reach the thrust plate, the timing gear and'the.governor mechanism.'· Oil fr·om the front main bearing is fed through the -drilled crankshaft to No. 1 connecting rod jo_urnal and from No. lthrough another drilled passage to No.2 connecting rod journal. Oil from the rear main bearing is fed to No.
_',CLUTCH THROWOUT BEARINGS. FORK-; : - ", mo~~th~-;9d~'~d ;prb)8.-Remo~~_ theh~ge pln frpm,,:the throwoutfork;. Remo,ve the ,pin fromtbe fork ,andremcwethe: bearing assem- . . bly • The bearlng ,may be~pressed~~,romtl:le , ,' carrler~ ,-.;,'-: __,,- 'l'r,' .., .~- ,~'.: -->~. -- ./ .. '- Insp'ection ClUTCH ADJUSTING Check the fork pivot pin and the pin ends of the bearing carrier and the holes in the fork.
FLYWHEEL T AND STARTER RING GEAR Removal Separate the engine from the clutch housing and remove the clutch. Remove the starter ring gear fr'om the flyWheel with a hammer and punch. Remove the four bolts from the flywheel. TO T 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 install on flywheel with the beveled end of the teeth toward the flywheel end of engine.
REAR WHEEL & AXLE HOUSING ' .. :"; . . ; .. Removal Inspection Drain transmission to pre_ve!1!C)ilfrom contacting brake bands. Remove the- rear-whee! to prevent damage to oil seals. When removing the left hand axle housing, the clutch pedal rod must be removed. Remove the bolt from the gas tank support and the four nuts attaching housing to transmission and differential case. 938-1 CROSSBAR with 31/4" CENTERS Always use a new oil seal. -drum for scoring.
l seal 800906, a bearing spacer 800904, ann brake drum spacer 800905. A new Rear Axle Kit 80090Zhas been provided for service. It consists of the axle, a new oil SEAL BEARING BRAKE DRUM SPACER TO INSTALL :1 SPACER 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. Heat drum and pres s into place.
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BRAKES -0 ~~> LOCK NUT ·.l~ OPERATING LEVER Check the lining for wear. It must be replaced when worn down to the rivet heads. Check the brake lever cam for wear. If worn until adjusting brakes is difficult, either in the cam surface or hinge points the parts should be replaced. Assembly. Tighten the support plate capscrews to 55 ft. lbs. torque and the support stud nut to 100 ft. lbs. torque.
•. '" 0·.·· FUEL TANK Removal. Remove the hood,fend~~s' ~d seal'. Shut off fuel valve under tank. Remove the- seat -and the fuel line. R~move tlie-tank brackets f~om the axle'housing~.·:·'/ --.' _.,- Check the tank for leaking and accwnulation of sediment. Clean if necessary. Check the tank cap for vent hole cleanliness. It must be open. Check cap gasket. It should seal tightly.
DIFFERENTIAL. T • PINION T 1HIUS'f WASte C) ~ : T «? ~ ~ SlOfGEAI ~j-~ •..• .--- .~SHAfT T T I IEAlIHG CAIII9 T I /') T TI Removal Assembly- Drain the transmission, remove the clutch housing and engine assembly. Remove the wheel and axle housings. Remove the brakes and brake support plates. Remove the differ('ntial bearing carriers. If a new ring gear is riveted to the carrier it should be cold riveted. Place the side gears and pinions in carrier.
SPECIAL LOW -GEAR Removal chipping. Check the shifter shaft for wear at the detent notches. Drain the transmission I '-.' Assembly' Separate the t.orque tube from the front of the transmission case. Install pinion gear with shift collar forward. Install gear with beveled ends of teeth forward. Adjust main shaft bearings to a free rolling fit without end play or binding. Adjust pinion shaft bearings to a slightly pre loaded fit (8 ounce Ft.).
wear and chipped or rough teeth. Check the shafts for worn splines. loaded fit, 8 ounce ft. Lock the nut by driving a portion of the thin section into the keyway of shaft. Assembly -(j' .. Tractors without the special low gear will have a spacer to take the place of the gear. Place the reverse idle gear, bearings and shaft in the case first. Install the cork in the reverse idler ·shaft to prevent loss of oil.
GEARSHIFT MECHANISM-_ -- 0- . .U,JIV!I-; J 11 rnLEVER GUIDE PINS LEVER GUIDE_ RAIL THIRD SPEED '. :~ WASHERS THIRD SPEED SHIFT RAil ornNT &AU & SPRING ...••. The gear shift is the same as used on the Model "B-C", except, the guide plate is notched for the special low gear and the lever is shaped differently and guide pins are used to control lever. either case exists the guide worn excessively or guide not lining up it may be possible to shift into two gears at once.
STEERING GEAR - -0 ADJUSTING SCREW !(J\ BEARING COVER-_~ RETAINER JACKET TUBE TUBE CLAMP 1\ BALL ARM Removal and housing. 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. Remove the steering gear ball arm and the two screws attaching steering gear to frame. Remove the four cover capscrews, cover and lever shaft.
FRONT AXLE A~D· SPINDLES Removal Raise tractor and block securely. Remove the drag links from the steering arm. Remove the key and n~t f.rom the fronto! radius rod. Slide 'axle assembly back until free of tractor. Check the spindle shafts and radius rod bushings for wear. H worn .020" or more, they should be replaced. Assembly' -- The radius rod bushings are .755" and are pre-fit. The spindle bushings are 1.126" and must be reamed after pressing into --place. .
-0 - - 0-37
~ ,I,' :,', SPRING L ~·r ~.:.'-{\t~;l,.• VALVE COVER~: N~/ .e'" VALVE LEVER"" DETENT SPRING~~ ~. SCREW OIL SEAL I "":rCONTROl A VALVE :! ~ COVER STUD WI . C) I """ Q) ' , --~--~oQ-' "\ DRIVE GEAR 1~ " , .- 1', :"-'. ~ '/" [] "':J I (JIll ' , ' SHIFTARM'r~~ -, - ,':', 0 ~ ii' ~vr'fl!!"'·'''' GASKET • _ ' , , , - - - THRUST {J ~8USHING " ,,', DRIVE GEAR SHIFTER PIN _ WASHER PLATE , , LUG/~~' SHIFTER PUMP BODY " .' ~', BEVEL \ BEARING SHAFT NUT \.
MODEL IIG" HYDRAULIC PUMP / General Pwnp Disassembly The Model "G" Hydraulic Pwnp is a gear type pump and develops approximately 900 P.S.I. It is driven from the belt pulley and is mounted on the side of the belt pulley assembly. 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 to prevent damage to lapped surface.
The relief valve spring should measure 3.131.16";'.~Us_ sealer on outside of needle bearing. Be long - free length. If 3/16" short it should be sure this sealer does not enter bearing. fress pump idle gear on shaft, locating it in center of replaced. Always use new oil seals .and "O!'" rings .-'" ~ "' sh~t. Assembly Clean·the la'ppedisurfaces,of PUJnp body, gear , - section i:Uldhousing throughly and place ,pdrts Place the.i·dler~g~~~·thrust.wa~hero·n th~.ih~it~~:;· together on the.l/4",dowelpins.
BELT PULLEY (OLD STYLE) Removal Remove the four capscrews attaching the pulley assembly to the clutch housing. Remove the cap from pinion shaft and remove the bearing adjusting nut and pull pulley hub. Remove the caps from the bevel gear shaft bearings. Move gear away from pinion as far as possible. Place two solid blocks between gear and case on pinion side of gear. Press shaft from gear. Pull pinion from case. Remove oil seal and bearing cups. It will not be necessary to remove the snap rings.
Allis-Chalmers "GU,.
