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SHOP MANUAL ALLIS-CHAMBERS MODELS 170, 175 Models 170 and 175 tractors are available in single wheel tricycie, duai wlieel tricycie or adjustabie front axie version. iModei 170 and eariy 175 are equipped witli either a 226 cubic inch non-diesel or 236 cubic inch diesel engine. Late Model 175 is equipped with either a 226 cubic inch non-diesel or a 248 cubic inch diesei engine. INDEX BRAKES 165 CARBURETOR Gasoline 80 CLUTCH Engine Clutch. 120 Engine Clutch Shaft 124 "Power Director" Clutch 131 COOLING SYSTEM Radiator 107 Water Pump 109,110 DIESEL FUEL SYSTEM Filters and Bleeding 85 Injection Pump 96 Nozzles 88 ELECTRICAL Alternator 118 Sparkplugs. . 115 Distributor 116 StartingMotor 119 Voltage Regulator 118A ENGINE (DIESEL) Assembly, R&R 26 Cam Followers 37 Camshaft 54 Connecting Rods & Bearings 62 Crankshaft & Bearings 64 Cylinder Head 58 Flywheel 71 Front Oil Seal 41 Main Bearings 64 Oil Pan 73 Oil Pump 76 Piston Pins 60 Piston & Rod Removal 56 ( By Starti ng Para Piston & Rings 58 Rear Oil Seal 69 Rocker Arms 39 Speed Adjustment 96 Timing Gear Cover 41 Timing Gears 45 Valve Guides 33 Valve & Valve Seats 30 Valve Springs 35 ENGINE (NON DIESEL) Assembly R&R 25 Cam Followers 36 CamShaft 52 Connecting Rods & Bearings 61 Crankshaft & Bearings 63 Cylinder Head 27 Cylinder Sleeves 57 Flywheel 70 FrontOilSeal 40 Grovemor 105 Ignition Timing 117 Main Bearings 63 OilPan 72 Oil Pump 74 Piston Pins 59 Piston & Rod Removal 55 Piston & Rings 68 Rocker Arms 38 Sparkplugs . 115 Speed Adjustment 105 Timing Gear Cover 40 TimingGears 42 ValveGuide 32 Valves & Valve Seats 29 Valve Springs 34 graph) FINAL DRIVE AND DIFFERNTIAL Bevel Gears, Adjust 148 Bull Gear, Renew 156 Bull Pinion, Renew 156 Differential, Overhaul 152 Final Drive Units, R&R 159 Wheel Axle Shafts 156 FRONT SYSTEM Adjustable Axle 5 Dual Wheel Tricycle 3 Single Wheel Tricycle 1 GOVERNOR (NON DIESEL) .... 105 IGNITION SYSTEM Distributor 116 Ignition Timing 117 Sparkplugs 115 "POWER-DIRECTOR" Clutch 131 Pump 136 Shafts and Gears 134 POWER LIFT SYSTEM Checks & Adustments 175 ControlValves 190 Pump 185 Three Point Lift System 191 POWER-TAKE OFF 170 STEERING SYSTEM 11 TRANSMISSION Bevel Pinion Shaft 145 Countershaft 146 Input Shaft 144 Reverse Idler 147 Shifter Assembly 141 CONDENSED SERVICE DATA GEHERAL Gasoline Diesel Engine Make Own Perkins Cylinders 4 4 Bore-Inches 4 3.875 Stroke-Inches 4K 5 Displacement-Cubic Inches . . 226 236 Piston Removed From ..... Above Above Main Bearings, Number of. . . 3 5 Main Bearings Adjustable? . . No No Rod Bearings Adjustable? . . . No No Cylinder Sleeves Wet Dry TUNE UP Firing Order 1-2-4-3 1-3-4-2 Valve Tappet Gap (Hot) Intake 0.010-0.012 0.010 Exhaust 0.014-0.016 0.010 45 45 TUNE-UP Cont. Diesel Valve Seat & Face Perkins intake 30 4 Exhaust 45 3-975 Ignition Distributor Make . . . D-R 5 Mark Indicating: 248 Retarding Timing See Above Full Advanced Timing .... Paragraph 5 Mark Location 117 No Breaker Point Gap 0.022 No Spark Plug Gap 0.025 Dry Injection Pump Make Injection Pump Timing .... Compression Pressure 1-3-4-2 at Cranking Speed 160 Low Idle RPM 525 0.010 High Idle RPM 2000 0.010 Full Load RPM 1800 45 45 CAV CAV See Paragraph 98 390-410 390-410 600 600 2000 2000 1800 1800

Allis Chalmers Models 170 Tractor Service Repair Manual

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Page 1: Allis Chalmers Models 170 Tractor Service Repair Manual



Models 170 and 175 tractors are available in single wheel tricycie, duai wlieeltricycie or adjustabie front axie version. iModei 170 and eariy 175 are equipped witlieither a 226 cubic inch non-diesel or 236 cubic inch diesel engine. Late Model 175 isequipped with either a 226 cubic inch non-diesel or a 248 cubic inch diesei engine.


Gasoline 80CLUTCH

Engine Clutch. 120Engine Clutch Shaft 124"Power Director" Clutch 131

COOLING SYSTEMRadiator 107Water Pump 109,110

DIESEL FUEL SYSTEMFilters and Bleeding 85Injection Pump 96Nozzles 88

ELECTRICALAlternator 118Sparkplugs. . 115Distributor 116StartingMotor 119Voltage Regulator 118A

ENGINE (DIESEL)Assembly, R&R 26Cam Followers 37Camshaft 54Connecting Rods & Bearings 62Crankshaft & Bearings 64Cylinder Head 58Flywheel 71Front Oil Seal 41Main Bearings 64Oil Pan 73Oil Pump 76Piston Pins 60Piston & Rod Removal 56

( B y S t a r t i n g P a r aPiston & Rings 58Rear Oil Seal 69Rocker Arms 39Speed Adjustment 96Timing Gear Cover 41Timing Gears 45Valve Guides 33Valve & Valve Seats 30Valve Springs 35

ENGINE (NON DIESEL)Assembly R&R 25Cam Followers 36CamShaft 52Connecting Rods & Bearings 61Crankshaft & Bearings 63Cylinder Head 27Cylinder Sleeves 57Flywheel 70FrontOilSeal 40Grovemor 105Ignition Timing 117Main Bearings 63OilPan 72Oil Pump 74Piston Pins 59Piston & Rod Removal 55Piston & Rings 68Rocker Arms 38Sparkplugs . 115Speed Adjustment 105Timing Gear Cover 40TimingGears 42ValveGuide 32Valves & Valve Seats 29Valve Springs 34


Bevel Gears, Adjust 148Bull Gear, Renew 156Bull Pinion, Renew 156Differential, Overhaul 152Final Drive Units, R&R 159Wheel Axle Shafts 156

FRONT SYSTEMAdjustable Axle 5Dual Wheel Tricycle 3Single Wheel Tricycle 1


Distributor 116Ignition Timing 117Sparkplugs 115

"POWER-DIRECTOR"Clutch 131Pump 136Shafts and Gears 134

POWER LIFT SYSTEMChecks & Adustments 175ControlValves 190Pump 185Three Point Lift System 191


Bevel Pinion Shaft 145Countershaft 146Input Shaft 144Reverse Idler 147Shifter Assembly 141


Gasoline DieselEngine Make Own PerkinsCylinders 4 4Bore-Inches 4 3.875Stroke-Inches 4K 5Displacement-Cubic Inches . . 226 236Piston Removed From . . . . . Above AboveMain Bearings, Number of. . . 3 5Main Bearings Adjustable? . . No NoRod Bearings Adjustable? . . . No NoCylinder Sleeves Wet Dry


Firing Order 1-2-4-3 1-3-4-2Valve Tappet Gap (Hot)

Intake 0.010-0.012 0.010Exhaust 0.014-0.016 0.010


TUNE-UP Cont.Diesel Valve Seat & FacePerkins intake 304 Exhaust 453-975 Ignition Distributor Make . . . D-R —5 Mark Indicating:248 Retarding Timing See —Above Full Advanced Timing . . . . Paragraph —5 Mark Location 117No Breaker Point Gap 0.022 —No Spark Plug Gap 0.025 —Dry Injection Pump Make —

Injection Pump Timing . . . . —Compression Pressure

1-3-4-2 at Cranking Speed 160Low Idle RPM 525

0.010 High Idle RPM 20000.010 Full Load RPM 1800


CAV CAVSee Paragraph 98

390-410 390-410600 6002000 20001800 1800

Page 2: Allis Chalmers Models 170 Tractor Service Repair Manual

MODELS 170 & 175 Paragraphs 1-5


front wheel assembly may be removedafter raising front of tractor and re-moving bolts (3—Fig. 1) at each endof front wheel spindle (1).

To renew bearing and/or seals, firstremove wheel assembly; then, unboltand remove bearing retainer (10—Fig.2), seal (4), seal retainer (5) andshims (9). Drive or press on oppositeend of spindle to remove spindle (8),bearing cones (7) and bearing cupfrom retainer side of hub. Then driveremaining seal and bearing cup out ofhub. Remove bearing cones from spin-dle.

Soak new felt seals in oil prior toinstallation of seals and seal retainers.Drive bearing cup into hub until cupis firmly seated. Drive bearing conestightly against shoulders on spindle.Pack bearings with No. 2 wheel bear-ing grease. Install spindle and bear-ings in hub and drive remaining bear-ing cup in against cone. When install-ing bearing retainer, vary the num-ber of shims (9) to give free rollingfit of bearings with no end play.

Front wheel bearings should be re-packed with No. 2 wheel bearinggrease after each 500 hours of use.

CAUTION: If necessary to renew singlefront wheel hub or repair tire, completely de-flate tire before unbolting tire retaining rings.

3 4

1. Spindle2. Fork3. Bolts (2)

Fig. 1 — Exploded view of single frontwheel fork and associated parts.

1. Nut2. Washer3. Bearing cone4. Bearing cup5. Wheel hub6. Bearing cup7. Bearing cone8. Wear sleeve9. Seal

10. Bearing spacer11. Spax:er shield12. Spindle 1 2 3 4 5 6 7 8 9 11 10 12

Fig. 3 — Views of front wheel hub assembly used on dual front wheel tricycle models.Wide front axle models are similar except spacer (TO) and shield (11) are not used.

2. R&R SINGLE FRONT WHEEL.FORK. Remove wheel assembly asioutlined in paragraph 1. Then unboli,and remove fork (2—Fig. 1) fromsteering sector shaft (14—Fig. 14).

When reinstalling fork, tighten theretaining cap screws to a torque oJ:130-140 Ft.-Lbs.


wheel and bearing construction oridual wheel tricycle models is of con-ventional design. Stamped steel wheeldisc is reversible on hub. Bearing ad-justment is made by tightening retain-ing nut on spindle until bearings arefirmly seated and then backing nutoff one castellation and installing cot-ter pin. Bearings should be repackedwith No. 2 wheel bearing grease aftereach 500 hours of use.

The three lips on outside diameterof seal (9—Fig. 3) contact steel wearsleeve (8) which is pressed into the;front wheel hub. Install spacer shield(11) and spacer (10) on spindle. In-stall seal on spindle with large diam-eter metal flange (with name andnumber) out toward bearing (7). Pack

• 2 3 4 5 6 7 8 7 6 5 4 9 10 1

Fig. 2 — Exploded view of single front wheel assembly.

wheel bearings with No. 2 wheel bear-ing grease and install inner cone incup. Drive wear sleeve into hub withcrimped edge of wear sleeve towardsbearing. Edge of wear sleeve shouldbe 1/4-inch past flush with hub.

4. R&R PEDESTAL. Raise front oftractor, then remove cap screws re-taining pedestal to front support cast-ing. The splined coupling (6—Fig. 4)will be removed with the pedestal as-sembly.

When reinstalling pedestal, holdsteering wheel in the center (straightahead) position and install pedestalwith wheels in straight ahead position(caster to rear).

5. OVERHAUL. To overhaul theremoved unit, remove cap screw (2—Fig. 4), washer (3), shims. (4) andcoupling (6). NOTE: Make certain that

2. Cap screw3. Washer4. Shims5. Snap ling6. Splined coupling7. Cap screw8. Pedestal9. Bearing cup

10. Bearing cone11. Oil seal12. Spindle shaft

n̂ —12

1. Side rings2. Tire

3. Wheel4. Seals

5. Seal retainers6. Bearing cups

7. Bearing cones8. Spindle

9. Shims10. Bearing retainer

Fig. 4—Exploded view of dual wheel frUcycle pedestal and associated parts.

Page 3: Allis Chalmers Models 170 Tractor Service Repair Manual


shims (4) are not lost or damaged asthey provide the proper bearing ad-justment. With splined coupling re-moved, spindle shaft can be with-drawn from pedestal. Pack bearing(10) with No. 2 wheel bearing grease.Oil seal (11) is of the lip type andshould be installed with lip towardsbearing. Coupling should be installedon spindle shaft with end of couplingnearest internal snap ring downward.When reassembling, vary the numberof shims (4) to provide shaft with afree rolling fit and no end play.


wheel and bearing construction onwide front axle models is of conven-tional design. Stamped steel wheeldisc is reversible on hub. Bearing ad-justment is made by tightening re-taining nut on spindle until bearingsare firmly seated; then, backing nutoff one castellation and installing cot-ter pin. Bearings should be repackedwith No. 2 wheel bearing grease aftereach 500 hours of use.

Fiq. 5—Exploded view offypical adjustable axleand associated parts, Ra-dius rod (23) is weldedto axle main member

(29).13. Axle support14. Bushing15. Axle pivot16. Snap ring17. Woodruff key18. Spindle arm19. Spindle support20. Bushlnga21. Thrust washers22. FVont axle spindle23. Radius rod24. Radius rod pivot bolt25. Pivot strap2S. Cap screw27. Center steering arm28. Tie rod29. Axle main m^nber

The three lips on outside diameterof seal (9—Fig. 3) contact a steel wearsleeve (8) that is pressed into thewheel hub. Install the seal over spin-dle with large diameter metal flange(with name and number) out towardbearing (7). Pack wheel bearings withNo. 2 wheel bearing grease and in-stall inner cone in cup. Drive the wearsleeve into hub with crimped edge ofsleeve towards bearing. Edge of wearsleeve should be V4-inch past flushwith hub.

7. ADJUSTMENTS. Front wheeltoe-in should be checked after eachtread width adjustment on adjustablefront axle models. All wide front axlemodels are provided with toe-in align-ment marks; however, it is advisableto measure front wheel toe-in andadjust to 1/16-1/8-inch if necessary.Be sure that the tie rod clamps are se-curely tightened.

8. REMOVE AND REINSTALL.Support tractor, and disconnect tierods from center steering arm (27—Fig. 5). Detach radius rod rear pivotfrom torque tube and lower rear of


radius rod. NOTE: Some rear pivotsmay be different from type shown inFig. 5. Move front axle assembly rear-ward and roll axle assembly awayfrom tractor. Axle support (13) canbe removed from the front support af-ter removing the attaching cap screws.Center steering arm is attached tosteering shaft with a roll pin.

STEERING KNUCKLES (SPINDLES)9. The procedure for removing the

spindle is evident after an examina-tion of the unit and reference to Fig.5. Bushings (20) should be installedflush with spindle support (19). Thesebushings are pre-sized and if carefullyinstalled will need no reaming. Tie-rod length should be varied to providea toe-in of 1/16-1/8-inch.

FRONT SPLITDetaching (splitting) the front

wheels and steering gear assemblyfrom tractor Is a partial job requiredin several other jobs such as remov-ing the timing gear cover.

10. To detach (split) the frontwheels and steering gear assemblyfrom tractor, first remove the grilleand hood. Drain coolant from radiatorand disconnect upper and lower radi-ator hoses. Unbolt and remove the ra-diator and radiator shell as a unit.Disconnect tubes from the steeringcylinder, support tractor under torquetube and unbolt front support fromside rails. On wide front axle models,disconnect the radius rod from itspivot bracket. On all models, roll thecomplete front assembly away fromtractor.


STEERING SYSTEMTractors are equipped with a hydrostatic

steering system that has no mechanical link-age between the steering wheel and tractorfront wheels. The control valve unit (Fig. 8)contains a rotary metering motor, a commu-tator feed valve sleeve and a selector valvespool. In the event of engine or hydraulicpower failure, the metering motor becomes arotary pump to actuate the power steeringcylinder when steering wheel is turned. Acheck valve in the control valve housingallows recirculation of fluid within the con-trol valve and steering cylinder during man-ual operation.

Power for the steering system is suppliedby a gear type pump mounted on right sideof the torque tube. . . r "

TROUBLE SHOOTING11. Before attempting to adjust or

repair the power steering system, thecause of any malfunction should belocated. Refer to the following para-graphs for possible causes of powersteering system malfunction:

Irregrular or "Sticky" steering. If ir-regular or "sticky** feeling is notedwhen turning the steering wheel withforward motion of tractor stopped andwith engine running at rated speed,or if steering wheel continues to ro-tate after being turned and released,foreign material in the power steer-ing fluid is the probable cause of trou-

ble. Renew the throw-away type oilfilter. It may be necessary to alsodrain the hydraulic sump and refillwith clean oil. If trouble is not cor-rected, the power steering valve as-sembly should be removed and ser-viced; refer to paragraphs 15 and 16.

Steering Cylinder "Hesitates". Ifsteering cylinder appears to pause intravel when steering wheel is beingturned steadily, probable cause oftrouble is air trapped in the powersteering cylinder. Bleed the cylinderas outlined in paragraph 12.

Slow Steering. Slow steering maybe caused by low oil flow from pump.Check time required for full stroke

Page 4: Allis Chalmers Models 170 Tractor Service Repair Manual

MODELS 170 & 175 Paragraphs 12-16

Fiq. 6—View of connec-tions for checking powersteerlnq system, inlet poriof the steering controlvalve (CV) must becapped before engine is;


travel of power steering cylinder;first with tractor on the front wheels,then with front end of tractor sup-ported by a jack. If time between thetwo checks varies considerably, over-haul the power steering pump as out-lined in paragraph 186.

Loss of Power. Loss of steeringpower may be caused by system pres-sure too low. Check and adjust reliefvalve setting as outlined in paragraph13.

LUBRICATION AND BLEEDING12. The torque housing compartment

is utilized as a reservoir for the hy-draulic systems including power steer-ing. Capacity is approximately 26quarts and only "AUis-Chalmers Hy-draulic Power Fluid 322" or automatictransmission oil type "A" suffix "A"should be used. The oil level can bechecked at the filler plug which islocated forward and to the left of gearshift lever. Make certain that lift armsare lowered and hydraulic cylindersare retracted.

The power steering system is usu-ally self-bleeding. With engine run-ning at high idle speed, cycle the sys-tem through several full strokes of thecylinder. In some cases, it may benecessary to loosen connections at cyl-inder to bleed trapped air.


Fig. 7 — Exploded view of the relief valveassembly. Refer to B—Fig. 10 for location.

TESTS AND ADJUSTMENTS13. A pressure and volume (flow)

test of the power steering system will,disclose whether the pump or reliefvalve is malfunctioning. To make sucha test proceed as follows:

Remove hood right rear side paneland disconnect steering system inlei:tube from the steering control valv€;and install a cap over inlet port ol:valve. Connect a pressure-volumestester inlet hose to steering system in-let tube as shown in Fig. 6. Connectthe outlet hose from tester to sumfireturn tube or transmission filleropening so that oil will be returnedto the reservoir. Start the engine andadjust speed to 1800 RPM. Close valveon tester until pressure is 1000 PSIand allow oil temperature to reach120-135 degrees F.

Close the valve on tester completelyand check pressure gage. If relief pres-sure is not 1100-1200 PSI, disassemblerelief valve (Fig. 7) and add or deductshims (5) to set pressure.

The addition of one shim shouldraise the relief pressure approximately50 PSI. Open the valve on testerslightly until pressure is 200 PSI be-low the relief pressure and observevolume of flow. With engine operat-ing at 1800 RPM and pressure 200PSI below relief pressure, volumeshould be 6 GPM. If volume of flowis too low, the pump should be ser-viced as outlined in paragraph 186.

POWER STEERING PUMP14. A gear type pump located on

right side of torque tube is used asthe power source for the steering sys-tem. The power steering pump is anintegral part of the hydraulic systempump and the "Traction Booster"pump. For service information on thethree section pump, refer to paragraph185.


Remove cover from below steeringcolumn and disconnect the four tubesfrom control valve. Unbolt and re-move control valve assembly from thesteering shaft housing.

Reinstall the control valve by re-versing the removal procedure. Re-fer to Fig. 9 for proper hose locations.Install new *'O" ring seals on the hosefittings before connecting hoses tocontrol valve and tighten fittings se-curely. Bleed trapped air from thepower steering cylinder as outlined inparagraph 12 after assembly is com-pleted.

16. OVERHAUL. After removingcontrol valve assembly, clean valvethoroughly and remove paint frompoints of separation with wire brush.Note: Make certain that work area isclean and use only lint free papershop towels for cleaning valve parts.

If oil leakage past seal (1—Fig. 8)is the only difficulty, a new seal canbe installed after removing only the

1. Oil seal2. Mounting plate3. Quad ring seal4. "O" ring

5A. Bearing races5B. Thrust bearing5C. Locator bushing

6. " O " ring7. Plug8. Check seat9. Check valve

10. Valve spring

11. Control valve body12. Center springs (fi)13. Centering pin14. Sleeve15. Valve spoollC. Plate17. Drive shaft18. Rotor19. Ring /20. Spacer /21. Cover (cnp)


Fig. 8 — Exploded view of sfeerinq eonfrol valve assembly. Centering springs (12) oreinsfalled in two groups of three springs with arch in each group back-to-back.

Page 5: Allis Chalmers Models 170 Tractor Service Repair Manual


mounting plate (2). Remove plug (7)from valve body using a bent wireinserted through out port (Fig. 9). In-stall new "O" ring (6—Fig. 8) on plug,lubricate plug and "O" ring with oiland reinstall in valve body. Installnew quad seal (3) and "O" ring (4) inmounting plate and tighten retainingcap screws equally to a torque of 250inch-pounds.

To completely disassemble and over-haul the control valve, refer to ex-ploded view in Fig. 8 and proceed asfollows: Clamp valve in vise with endcap (21) up and remove end cap re-taining screws. Remove end cap (21),gerotor set (18 & 19), plate (16) anddrive shaft (17) from valve body as aunit. Remove valve from vise, placea clean wood block in vise throat andset valve assembly on block withmounting plate (2) end up. Lightlyclamp vise against port face of valvebody and remove mounting plate re-taining screws. Hold spool assemblydown against wood block while re-moving mounting plate. Remove valvebody from vise and place on workbench with port face down. Carefullyremove spool and sleeve assemblyfrom 14-hole end of valve body. Usebent wire inserted through outlet portto remove check valve plug (7) anduse i^-inch Allen wrench to removecheck valve seat (8). Then removecheck valve y4-inch steel ball (9) andspring (10) from valve body.

Remove centering pin (13) fromspool and sleeve assembly, and pushspool (splined end first) out of sleeve.Remove the six centering springs (12)from slot in spool.

Separate the end cap and plate fromthe gerotor set and remove the driveshafti rotor and spacer.

Fig. 9—View of steering control valve show-ing port locations. Pressure tube from pumpconnects to **IN'* port; return tube to sumpconnects to "OUT" port; tube to rear endof cylinder connects to "L" (left turn) port,and tube to rod end of cylinder connects

to "R" (right turn) port.

Inspect all moving parts for scoring.Slightly scored parts can be cleanedby hand rubbing with 400 grit abra-sive paper. To recondition gerotor sec-tion surfaces, place a sheet of 600 gritpaper on plate glass, lapping plate orother absolutely flat surface. Strokeeach surface of the gerotor sectionover the abrasive; any small brightareas indicate burrs that must be re-moved. Polish each part, rinse in cleansolvent and air dry; keep these partsabsolutely clean for reassembly.

Renew all parts that are excessivelyworn, scored or otherwise damaged.Install new seal kit when reassem-bling.

To reassemble valve, proceed as fol-lows: Install check valve spring (10)with small end out. Drop check valveball (9) on spring and install valveseat (8) with counterbored side to-wards valve ball. Tighten seat to atorque of 150 inch-pounds. Lubricatevalve spool and carefully insert spool(15) in valve sleeve (14) using atwisting motion. Stand the spool andsleeve assembly on end with springslots up and aligned. Assemble cen-tering springs (12) in two groups withextended edges of springs down. Placethe two groups of springs back-to-back (arched sections together) andinstall the springs into the springslots in sleeve and spool in this posi-tion. Use a small screwdriver to guidesprings through slots in opposite sideof assembly. Center the springs withedges flush with upper surface ofsleeve. Inser t center ing pin (13)through spool and sleeve assembly sothat both ends of pin are below flushwith outside of sleeve (14). Carefullyinsert spool and sleeve assembly,splined end first, in 14-hole end ofvalve body (11). Set body on cleansurface with 14-hole end down. In-stall new "O" ring (6) in check valveplug (7), lubricate plug and insert incheck valve bore. Install locator (5C)in valve bore with chamfered side up.Install thrust bearing assembly (5Aand 5B) over valve spool (15). Installnew quad seal (3) and "O" ring (4)in mounting plate (2), lubricate sealand install mounting plate (2) overvalve spool, thrust bearing and lo-cator. Tighten the mounting plate re-taining screws evenly to a torque of250 inch-pounds. Clamp the mountingplate in a vise with 14-hole end ofvalve body up. Place plate (16) andgerotor outer ring (19) on valve bodyso that bolt holes align. Insert driveshaft (17) in gerotor inner rotor (18)so that slot in upper end of shaft isaligned with valleys in rotor and push

Fiq. 10—- Drawing of the steering systemcomponents and tubes.

A. PumpB. Relief valveC. Control valveD. FilterE. Steering cylinder1. Suction tube

' 2. Pump pressure tube3. Steering pressure tube4. Outlet tube5. Outlet tube6. Return tube7. Left turn tube8. Right turn tube

shaft through rotor so that about ^of length of the splines protrude. Hold-ing the shaft and rotor in this posi-tion, insert them in valve housing sothat notch in shaft engages centeringpin in valve sleeve and spool. Installspacer (20) at end of drive shaft; ifspacer does not drop down flush withrotor, shaft is not properly engagedwith centering pin. Install end cap(21) and tighten the retaining screwsequally to 150 inch-pounds torque.


Remove grille, hood, air cleaner andfront support breather. Drain coolantfrom radiator, then disconnect radiatorhoses. Unbolt radiator shell from frontsupport and side rails, then removethe radiator and shell as a unit. Sup-port front of torque tube and removethe single front wheel fork and wheelassembly, dual wheel tricycle pedestaland wheel assembly or the wide frontaxle and support assembly.

NOTE: On wide front axle models, drivethe pin out of center steering arm and re-move the center steering arm from thesteering shaft. On all models, disconnecttubes from the steering cylinder and coverthe openings. Attach hoist to the front sup-port; then, unbolt and remove front supportfrom side rails. ' > .

Page 6: Allis Chalmers Models 170 Tractor Service Repair Manual

MODELS 170 & 175 Paragraphs 19-20

Fig. 13 — Partial ly ex-pioded view af the powersteering front support.For exploded views of thecontrol vaive unit andram refer to Figs. 8

and 15.

44. Front support48. Rack adjusting block4d. Rack adjusting shims

(0.003 & 0.006)50. Plug52. Breather53. Bearing cup54. Bearing cone55. Sector gear56. Snap ring57. Steering shaft58. Bearing oone59. Bearing cup60. Shims (0.005 & 0.010)61. Oil seal62. Bearing support


Refer to paragraphs 19, 20 and 21for disassembly, adjustment and as-sembly procedures. Refer to paragraph22 for servicing the steering cylinder.

Reverse removal procedure to rein-stall the front support. Tighten thescrews attaching front support to siderails to 310-320 Ft.-Lbs. torque. Re-fill front support with "AUis-ChalmersSpecial Gear Lube". Capacity is ap-proximately 3V4 quarts and oil shouldbe maintained at Vs-inch above gears.

19. DISASSEMBLY. With the frontsupport removed as outlined in para-graph 18, proceed as follows: Unboltbearing support (62—Fig. 13 or 9—Fig.14), then withdraw steering shaft andsector gear from front support cast-ing. CAUTION: Do not lose or dam-age shims (60—Fig. 13) on dual wheeltricycle or wide front axle models. Onall models, unbolt and remove rackadjusting block (48) and steering cyl-inder (67). CAUTION: Do not lose ordamage shims (49). Remove idler shaftlock (65), then pull idler shaft (63)out top of front support casting.NOTE: Top end of idler shaft isthreaded for using a puller screw.Withdraw idler gear through bottomopening. Further disassembly will beevident after examining Figs. 13 and14.

Thoroughly clean the front supportcasting and inspect all gears, bearingsand shafts. Any excessive play be-tween steering unit gears or loosenessof sector gear on steering shaft maycause shimmy of front wheels. Referto paragraph 22 for servicing thesteering cylinder.

20. ADJUSTMENT. Rack mesh posi-tion and steering shaft end play areadjustable. Each adjustment must beaccomplished with only a minimum ofparts installed in the front supportcasting.

On models with single front wheel,adjust steering shaft bearings as fol-lows: Install both bearing cups (7 &11—Fig. 14) in bearing support (9)

63. Idler gear shaft64. Idler gear65. Lock plate67. Steering cylinder68. Rack76. "O" Ting


until firmly seated. Pack the lowerbearing cone (12) with No. 2 wheelbearing grease and position cone inthe lower cup (11). Use sealer on out-side diameter of seal (13) and driveseal into support (9) with lip towardbearing (11 & 12). Install new "O"ring (10) in groove on steering shaft(14). Insert steering shaft throughseal and lower bearing cone untilshoulder on shaft is seated againstbearing cone (12), Install the upperbearing cone (6) on shaft. Install sec-tor gear (5) on shaft splines withmark on top of gear hub aligned withthe marked spline of shaft. Install capscrew (1), lock washer (2), flatwasher (3) and shims (4). Vary thethickness of shims (4) to provide aslight pre-load on bearings whenscrew (1) is tight. It is not necessaryto install the steering shaft, supportand bearings assembly in the frontsupport casting to assemble or adjust.The unit should not be installed untilcorrect rack mesh position is adjusted.

On dual wheel tricycle and widefront axle models, adjust the steeringshaft bearings as follows: Drive thelower bearing cup (59—Fig. 13) intobearing support (62) and upper bear-ing cup (53) into the front supportcasting until cups are firmly seatedagainst shoulders in bores. Applysealer to outside diameter of seal (61)and install seal in bearing supportwith lip towards bearing cup (59).Install snap ring (56) in groove onsteering shaft (57) and drive thelower bearing cone (58) tight againstsnap ring. Install sector gear (55) onsteering shaft with protruding hubdown (against snap ring) and timingmark on top of gear hub aligned with

1. Cap screw2. Lockwasher3. Washer4. Shims5. Sector ge«tr6. Bearing cone7. Bearing cup8. Gaskets9. Bearing support

10. "O" ring11. Bearing cup12. Bearing cone13. Seal14. Steering shaft

Fiq. 1 4 — On sinqle front wKeel tricyclemodels, above ports are used in steeringqeor Instead of items 53 throuqh 62 shownin Fiq. 13. Mark on hub of sector qear (5 )must be aliqned with punch mark on top

of sector shaft ( 1 4 ) .

mark on steering shaft. NOTE: Markon shaft is located in the undercutarea of bearing surface above thesplines. Be sure that hub of gear istight against snap ring (56) and installthe upper bearing cone (54) tightly,against sector gear. Install the steer-ing shaft, gear and bearing supportassembly (parts 54 thru 62 except "O*'ring (60A) using shims (60) that wereremoved. Tighten the two bearing sup-port retaining screws to 90-100 Ft.-Lbs. torque and check steering shaftfor looseness or binding. Vary thenumber and thickness of shims (60) toprovide a free rolling fit with no endplay. After the correct number andthickness of shims (60) is determined,remove the steering shaft assemblyand adjust the rack mesh position.NOTE: Make certain that the correctshims are not lost or damaged. Thesteering sector gear must be removedwhen checking rack mesh position.

To adjust the rack mesh position onall models, position idler gear (64—Fig. 13) through hole in bottom of thefront support casting with oil hole ingear toward top. Install idler shaft(63) and retain in position with plate(65). CAUTION: Do not damage thethreads when installing the idler shaft.Insert rack (68); then, install adjust-ing block (48) using the shims (49)that were removed. NOTE: Whenchecking rack mesh position, rack (68)must be detached from the steeringcylinder piston rod. The rack should

Page 7: Allis Chalmers Models 170 Tractor Service Repair Manual

Paragraphs 21-26 ALLIS-CHALMERS

73A 74 74A 73 74B 69 67


06. Retaining flange- » d) ti7. Ram cylinder

fi8. Ram rackfiO. Snap ring70. Rod guide71. "O" ring72. Back up ring73. Rann piston

73A. Piston rod74. Sealing ring

74A. *'O" ring74B. Wear ring

75. Piston rod"O" ring7fi. Ram-aupport "O" ring

68 76 70 71 72 75

Fig. 15 — Exploded view of the power steering ram (cylinder).

move freely without any backlash.Vary the number of shims (49) ifrack is loose or binding. Paper shims(0.005 thick) and steel shims (0.003thick) should be alternately placedfor proper sealing. When proper ad-justment is obtained, withdraw therack (68), leaving the adjusting block(48) and the correct shims (49) in-stalled. Attach rack (68) to the pistonrod (73A—Fig, 15) with pin (73B).Head of pin (73B) must be on toothedside of rack (68). Rivet the pin se-curely in position taking care not todraw ears of piston rod together.

21, ASSEMBLY. When assembling,refer to paragraph 20 for adjustmentand assembly of the steering cylinderrack, idler gear and sector assembly.The steering cylinder and steeringshaft must be correctly timed (cen-tered) for correct operation as fol-lows:

Pull the rack (68—Fig. 15) out ofthe steering cylinder (67) as far aspossible, then mark the rack 2 1/16-2 3/32 (2.08) inches from front edgeof piston rod guide (70). Push therack back into cylinder until the mark

is aligned with edge of piston rodguide. Loosen the screws attachingthe rack adjusting block (48—Fig,13) and install the steering cylinderusing new *'O" ring (76), CAUTION:With the previously affixed markaligrned with front edge of rod gruide,the steering piston is correctly cen-tered and must not be moved until af-ter the sector gear Is installed.

On models with single front wheel,install the steering shaft assembly(Fig, 14) with mark on edge of steer-ing shaft flange in straight forward(centered) position, CAUTION: Makecertain that idler gear and rack arenot moved while installing steeringshaft assembly. Make certain that in-stallation is correct by turning steer-ing shaft (14) in both directions andobserving the mark on flange. Tightenthe support retaining ^-inch screwsto 90-100 Ft,-Lbs, torque and the %-inch screws to 130-140 Ft,-Lbs, torque.

When installing the steering shaftassembly on dual wheel tricycle andwide front axle models, use the pre-viously selected shims (60—Fig, 13)and new "O" ring (60A). Position the

steering shaft with marks on sectorgear (55) and shaft away from rack(68) and retaining pin hole for thecenter steering arm (27—Fig. 5) ex-actly across (left to right) the frontsupport casting. Check operation byturning steering shaft (57—Fig. 13)in both directions. Tighten the two ^ -inch support retaining screws to 90-100 Ft.-Lbs. torque.

After assembling the front support,refill with approximately 3 ^ quartsof "Allis-Chalmers Special GearLube**. Oil should be maintained Vs-inch above gears.


move the steering cylinder (Fig. 15),it is necessary to remove the frontsupport as outlined in paragraph 18,then disassemble the complete frontsupport as in paragraph 19. With cyl-inder removed, remove rack attachingpin (73B), then withdraw rod guide(70) and piston (73) from cylinder.

Examine all parts and renew anythat are scored or show excessivewear. Lubricate all parts prior to as-sembly and renew all seals. Beforeassembling rack (68) to piston rod(73A), the rack mesh position shouldbe adjusted as outlined in paragraph20,

After rack mesh position is adjusted,attach rack to piston rod with headof pin (73B) toward toothed side ofrack (68). Rivet the pin securely inposition taking care not to draw earsof piston rod together. When assem-bling the front support, steering cyl-inder and steering shaft must be cor-rectly timed. Refer to paragraph 21for assembly and timing procedure.


Non-Diesel25, To remove the engine and clutch

as a unit, first drain cooling systemand, if engine is to be disassembled,drain oil pan. Perform a front splitas outlined in paragraph 10 and pro-ceed as follows: Disconnect the groundstrap from battery; then, disconnectwiring from alternator and ignitioncoil. Remove the muffler, hood sidesheets and air cleaner tube. Disconnectoil pressure gage wire, fuel line, chokecable, speed control cable and tem-perature gage wire from engine. Un-bolt and remove both engine side rails.Support engine in hoist, remove thecap screws retaining engine adapter

plate to torque housing, separate theengine from torque housing and movethe engine to a stand or work bench.

Reinstall engine and clutch unit byreversing removal procedures.

Diesel26, To remove the diesel engine and

clutch as a unit, first drain the cool-ing system and, if engine is to be dis-assembled, drain the oil pan. Performa front split as outlined in paragraph10 and proceed as follows:

Disconnect ground strap from bat-teries; then, disconnect wiring from al-ternator. Disconnect tubes from aircleaner.

Remove the main fuel line runningto the primary filter and the fuelleak-off line from fuel tank to en-gine. Remove the muffler and hoodside sheets. Disconnect throttle andfuel shut-off cables. Disconnect theoil pressure gage wire and the tem-perature wire from engine. Unbolt andremove both engine side rails. Supportengine in hoist, remove the cap screwsretaining engine adapter plate totorque housing, separate engine fromtorque housing and move the engineto a stand or bench.

Reinstall engine and clutch unit inreverse of removal procedure. Bleedthe fuel system as outlined in para-graph 86.


Page 8: Allis Chalmers Models 170 Tractor Service Repair Manual

MODELS 170 & 175 Paragraphs 27-30

10 14 3 13 1

11 7 6 2 5Fiq. 20 — Tighten non-diesel cylinder headcap screws and stud nuts in sequenceshown. Refer to text for torque specifica-




remove the cylinder head, first drainthe cooling system, shut off fuel andremove hood. Remove the air cleanertube and disconnect the carburetorlink, fuel line and choke cable fromcarburetor. Unbolt and remove mani-folds, carburetor and muffler as aunit. Disconnect the temperature gagewire and remove the four nuts fromcylinder head s tuds tha t extendthrough the water manifold (thermo-stat housing) and core hole cover.Disconnect upper hose from radiatorand by-pass hose from water pump;then, remove the thermostat housingand hoses as a unit. Disconnect sparkplug wires and oil line to cylinderhead. Remove the rocker arm cover,rocker arm assembly and push rods.Remove cylinder head retaining capscrews and lift head from engine.

When reinstalling cylinder head, re-verse removal procedures and tightenthe head retaining cap screws andstud nuts in order shown in Fig. 20.Tighten the ^-inch cap screws andthe four stud nuts to a torque of 90-

95 Ft.-Lbs. and the A-inch cap screws;to a torque of 70-75 Ft.-Lbs. Rechecktorque after engine has reached oper-ating temperature.


remove the cylinder head, first draincooling system, remove hood and shut;off the fuel. Disconnect upper radiatorhose and heat indicator sending unit:wire from side of head. Remove mani-folds, injector lines and injectors. Re-move rocker arm cover, rocker arms;and push rods; then unbolt and re-move the cylinder head. NOTE: Tips:of injectors protrude through cylinderhead and may be damaged if not re-moved.

The cylinder block, head and headgasket are internally ported to pro-vide pressure lubrication to rockerarms (see Arrow—Fig. 21). Make surepassages are open and aligned whenhead is reinstalled. Cylinder head maybe milled to remove surface defects:provided no more than 0.012 of metalis removed or total head thickness is;not reduced below 4.0355. If head is:resurfaced, valve height must bechecked as outlined in paragraph 30

Head gasket is marked 'TOPFRONT" for proper installation. Gas-ket is treated and must be installeddry. Tighten cylinder head stud nuts;to a torque of 85 Ft.-Lbs. using the;sequence shown in Fig. 22. Adjust;valve tappet gap as outlined in para-graph 31. Head should be re-torqued.and tappet gap readjusted after en-gine has been warmed to operating;temperature.

Fiq. 21—View of diesel cylinder headshowinq vaives and valve numbers. Arrowindicates oil pressure passage to rocker


Fiq. 22—On diesel mod-els, tighten cylinder headstud nuts to a torque of85 Ft.-Lbs. usinq the se-

quence shown.

Fig. 23 — Use a straight edge and feelei*gage to check valve head height. Refer to

paragraph 10.

Fig. 24—Machining dimensions for installa-tion of service valve seat inserts on diesel



29. Inlet valve for non-diesel en-gines have a face and seat angle of30 degrees. The seat width can benarrowed by using 15 and 70 degreestones to obtain the desired seat widthof i^-inch. Valve stem diameter is0.3723-0.3730.

The exhaust valves for all non-die-sel engines have a face and seat angleof 45 degrees. The seat width can benarrowed by using 30 and 60 degreestones to obtain the desired seat widthof iV to 5/64-inch. The exhaust valvesseat in renewable ring type insertswhich are available for service instandard size and one oversize. Ex-haust valve stem diameter is 0.3713.

The positive type exhaust valve ro-tators require no maintenance, butthe valve should be observed whileengine is running to be sure that itrotates slightly. Renew the rotator onany exhaust valve that fails to turn.

Refer to paragraph 31 for settingtappet gap.

Diesel30. Intake and exhaust valves seat

directly in the cylinder head. Valveheads and seat locations are numberedconsecutively from front to rear. In-take and exhaust valves have a faceand seat angle of 45 degrees and adesired seat width of ^ to ^-inch.Refer to paragraph 33 for valve stemand guide data.

Valve heads should be recessed aspecified amount into the cylinderhead. Clearance can be measured us-

Page 9: Allis Chalmers Models 170 Tractor Service Repair Manual

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Page 10: Allis Chalmers Models 170 Tractor Service Repair Manual

Paragraphs 31-38 ALLIS-CHALMERS


Fig. 2 6 — W i t h number 1 piston at TDC oncompression stroke, valve clearances ( tap-pet qap) can be set on the four valves in-dicated. Refer to text for recommendedclearances. Refer to Fig. 26A and adiust

remainder of valves.

ing a straight edge and feeler gage asshown in Fig. 23. Production clear-ance is 0.029. A maximum clearanceof 0.055 is permissible. Inlet and ex-haust valve seats are available forservice on those units where valverecess exceeds the recommended lim-its. Fig. 24 shows machining dimen-sions for the seats. After a new seatis installed, recess the valve by usinga 30** stone. Inlet and exhaust valvetappet gap should i.a set to 0.010 hotor 0.012 cold.


31. Tappet gap should be set to thefollowing clearances.Non-Diesel—Cold

Inlet 0.012-0.014Exhaust 0.016-0.018

Non-Diesel—HotInlet 0.010-0.012Exhaust 0.014-0.016

Diesel—ColdInlet & Exhaust 0.012

Diesel—HotInlet & Exhaust 0.010Two-posi t ion adjustment of all

valves is possible as shown in Figs.26 and 26A. To make the adjustment,turn crankshaft to No. 1 cylinder TDCmarked on flywheel. If No. 1 pistonis on compression stroke, both frontrocker arms will be loose and bothrear arms will be tight; adjust thevalves indicated in Fig. 26. If rearpiston is on compression stroke, bothfront rocker arms will be tight andboth rear rocker arms will be loose;adjust the valves indicated in Fig.26A. After adjusting four valves, turnthe crankshaft one complete revolu-tion unt i l TDC marks are againaligned and adjust the remainingvalves.


32. Valve guides should be renewedif clearance between stems and guides

FRONT i-Fig. 26A — With niimber 4 piston at TDCon compression stroke, valve clearances(tappet gap) can be set on the four valves

indicated. Refer also to Fig. 26.

exceeds 0.008. In take and exhaustvalve guides are not interchangeable.New exhaust valve guides should bepressed into head until top of guideis flush with the machined rockercover gasket surface of cylinder head.Top of inlet valve guide should beVs-inch below machined rocker covergasket surface. Both intake and ex-haust valve guides should be reamedto an inside diameter of 0.374-0.375.Clearance between valve stems andguides should be 0.001-0.0027 for in-let, 0.002-0.0037 for exhaust.

Diesel33. Intake and exhaust valve guides

are not renewable, and oversize valvestems are provided for service.

Standard guide bore diameter is0.375-0.376 for both the intake andexhaust valves, with a desired stemto bore clearance of 0.0015-0.0035 forintake valves and 0.002-0.004 for ex-haust valves. Valves with standardsize stems (0.373 inlet, 0.3725 exhaust)should be renewed if stem diameteris less than 0.371 inch. Oversizes of0.003, 0.015 and 0.030 are provided forintake and exhaust valve stems.


34. The interchangeable intake andexhaust valve springs should be re-newed if they are rusted, distorted orfail to meet the following test speci-fications:Spring free length 2-^ inches

Renew if less than 2y4 inchesPounds pressure

@ Iff inches 37-43Pounds pressure

@ 1A inches 65-75Diesel

35. Springs, retainers and locks areinterchangeable for intake and ex-haust valves. Umbrella type oil de-flectors are used on intake and ex-haust valve stems. Valve springs haveclose damper coils which should beinstalled next to cylinder head. Re-new valve springs if they are rusted.

discolored or distorted, or fail to meetthe specifications which follow:

Lbs. test @ 1 25/32 inches ..38-42Lbs. test @ 1 23/64 inches ..69-76


36. The mushroom type cam fol-lowers (tappets) ride directly in un-bushed cylinder block bores and canbe removed after removing the cam-shaft as outlined in paragraph 52.Cam followers are available in stan-dard size only and followers and/orblock should be renewed if clearancebetween followers and bores is ex-cessive.

Diesel37. The mushroom type cam follow-

ers (tappets) operate directly in ma-chined bores in engine block and canonly be removed after removing thecamshaft as outlined in paragraph 54.The 0.7475-0.7485 diameter cam fol-lowers are furnished in standard sizeonly and should have a diametralclearance of 0.0015-0.0037 in blockbores. Adjust the tappet gap as out-lined in paragraph 31.


38. R&R AND OVERHAUL. Rockerarms and shaft assembly can be re-moved after removing the hood,rocker arm cover, oil line to rockerarm shaft and the four retaining nuts.

To disassemble the rocker arm as-sembly, remove the cotter pin andwasher from each end of shaft; thenslide rocker arms, shaft supports andsprings from shaft.

The valve stem contact surface ofthe rocker arms can be resurfaced,but the surface must be kept parallelto rocker arm shaft and original ra-dius maintained. Desired clearancebetween rocker arm and shaft is0.0025-0.0055. If c learance exceeds0.008, renew the rocker arm and/orshaft. Rocker arm bushings are notavailable separately from rocker arm.The intake valve rocker arms can beidentified by a milled notch locatedon the arm upper surface betweenthe shaft and valve stem end. Rein-stall rocker arm shaft with the oilingholes toward the cylinder head. Re-new cork plugs in each end of rockerarm shaft if loose or damaged.

Lip of rocker arm baffle should bestraight and contact rocker arm coverfirmly. Before tightening the rockerarm cover retaining nuts, the lip ofbaffle should hold cover up approxi-mately %-inch on the push rod side.

Refer to paragraph 31 for adjustingvalve tappet gap.