IH 3088, 3288, 3488 Hydro & 3688 Tractor Service Repair Shop Manual - IMPROVED -

SHOP MANUAL INTERNATIONAL HARVESTER SERIES 3088·3288·3488 Hydro·3688 Engine serial number is stamped on right side of engine crankcase on Models 3088 and 3288. On Models 3488 Hydro and 3688, engine serial number is stamped on left side of engine crankcase. On a" models, tractor serial number is stamped on name plate attached to right side of rear frame. Cab/ROPS serial and model numbers are stamped on a plate attached on right side. INDEX (BY STARTING PARAGRAPH) BRAKES Adjustment. ................... . Bleeding ...................... . Brake Control Valve ............ . R&R and Overhaul. ............. . CLUTCH, ENGINE Adjustment. ................... . Hydraulic Assist Clutch Cylinder ............... . Overhaul ..................... . Remove and Reinstall ........... . COOLING SYSTEM Coolant Filter-Conditioner ........ . Fan .......................... . Radiator ...................... . Water Pump ................... . DIESEL FUEL SYSTEM Adjustment. ................... . Ether Starting Aid .............. . Filters and Bleeding ............. . Injection Nozzles ............... . Injection Pump ................. . Static Timing .................. . ELECTRICAL SYSTEM Alternator and Regulator ......... . Starting Motor ................. . Starter Solenoid ................ . ENGINE 2 Assembly, R&R ................ . Cam Followers ................. . Camshaft and Bearings .......... . Connecting Rods and Bearings ................. . Cooling Tubes, Coolant Directors and Nozzle Sleeves ............ . Crankshaft and Main Bearings .................... . 3088 179 178 182 181 112 11.9 118 117 106 103 102 104 94 100 89 96 90 92 107 110 111 45 52 68 76 47 78 3288 179 178 182 181 112 119 118 117 106 103 102 104 94 100 89 96 90 92 107 110 111 45 52 68 76 47 78 3488 Hydro 179 178 182 181 106 103 102 105 95 100 89 96 91 93 107 110 III 45 53 70 77 47 79 3688 179 178 182 181 112 119 118 117 106 103 102 105 95 100 89 96 91 93 107 110 111 45 53 70 77 47 79 3688 Hi·Clear 179 178 182 181 112 119 118 117 106 103 102 105 95 100 89 96 91 93 107 110 III 45 53 70 77 47 79

INDEX (CONT.) 3488 3688 3088 3288 Hydro 3688 Hi-Clear ENGINE CONT. Crankshaft Oil Seals .............. 80 80 80 80 80 Cylinder Head .................. 46 46 46 46 46 Flywheel ...................... 82 82 82 82 82 Oil Cooler ...................... 87 87 88 88 88 Oil Pressure Regulator ............ 85 85 86 86 86 OilPump ...................... 83 83 84 84 84 Piston and Rod Units ............. 72 72 72 72 72 Piston Pins ..................... 75 75 75 75 75 Pistons, Sleeves and Rings .................... 73 73 74 74 74 Timing Gear Cover .............. 59 59 59 59 59 Timing Gears ................... 60 60 64 64 64 Valves, Guides and Springs ................... 50 50 51 51 51 Valve Levers ................... 54 54 55 55 55 Valve Rotators .................. 56 56 56 56 56 Valve Timing ................... 57 57 58 58 58 Valves and Seats ................ 48 48 49 49 49 FINAL DRIVE Bearing Adjustment ............ 175 175 175 175 177 R&R and Overhaul ............. 174 174 174 174 176 FRONT SYSTEM All-Wheel Drive ................ 5 5 5 5 Axle Main Member ............. 1 1 1 1 2 Steering Knuckles .............. 4 4 4 4 4 Tie Rods and Toe-in ............. 3 3 3 3 3 HYDRAULIC SYSTEM Auxiliary Control Valve ......... 218 218 218 218 218 Auxiliary Coupler .............. 219 219 219 219 219 Control Linkage Adjustment ........... • ...... 196 196 196 196 196 Hydraulic Lift Housing .......... 205 205 205 205 205 Hydraulic Pump ................ 214 214 215 215 214 Hydraulic Seat ................. 221 221 221 221 221 Test and Adjust ................ 188 188 191 191 188 Troubleshooting ............... 186 186 187 187 186 HYDROSTATIC DRIVE Adjustment ................... 141 Disassembly ................... 152 Lubrication and Filter ........... 140 Pressure Checks ............... 146 Reassemble and Reinstall ........ 162 Removal ...................... 151 System Clean-up ............... 166 Troubleshooting ............... 139 MAIN BEVEL GEAR AND DIFFERENTIAL Adjustment ................... 167 167 167 167 167 Differential Lock ............... 171 171 171 171 171 R&R Bevel Gears .............. 169 169 169 169 169 R&R Differential ............... 1(0 170 170 170 170 POWER STEERING SYSTEM Filter, Lubrication and Bleeding .................... 18 18 18 18 18 Flow Divider .................. 36 36 37 36 36 HandPump ................... 34 34 34 34 34 Multiple Control Valve .......... 39 39 40 39 39 Multi-Valve and Oil Cooler ....... 42 Oil Cooler ..................... 41 41 41 41 Operation ..................... 16 16 17 16 16 Operational Tests .............. 20 20 21 20 20 Pump ............. • .......... 29 29 32 29 29 Steering Cylinder .............. 38 38 38 38 38 3

INDEX (CONT.) 3488 3688 3088 3288 Hydro 3688 Hi-Clear POWER STEERING CONT. Telescoping Steering Column ..................... 44 44 44 44 44 Tilt Steering Wheel ............. 43 43 43 43 43 Troubleshooting ............... 19 19 19 19 19 POWER TAKE-OFF Control Cable Adjustment ....... 185 185 185 185 185 Pressure Check and . Adjustment .................. 183 183 183 183 183 R&R and Overhaul ............. 184 184 184 184 184 RANGE TRANSMISSION Linkage Adjustment ............ 137 137 137 137 137 Overhaul ...................... 126 126 126 126 126 Remove and Reinstall ........... 125 125 125 125 125 TORQUE AMPLIFIER AND SPEED TRANSMISSION Adjustment ................... 120 120 120 120 Overhaul ...................... 124 124 124 124 Remove and Reinstall ........... 123 123 123 123 Torque Amplifier Shift Solenoid ................. 121 121 121 121 Transmission Brake ............ 122 122 122 122 This service manual provides specifications in both the U.S. Customary and Metric (SI) system of measurements. The first specification is given in the measuring system used during manufacture, while the second specification (given in parenthesis) is the converted measurement. For instance, a specification of "0.011 inch (0.279 mm)" would indicate that the equipment was manufactured using the U.S. system of measurement and the metric equivalent of 0.011 inch is 0.279 mm. CONDENSED SERVICE DATA 3488 3088 3288 Hydro 3688, 3688 Hi-Clear GENERAL Engine Make .......................... . IH IH IH IH Engine Model ......................... . D-358 D-358 D-466 D-436 Number of Cylinders .................... . Bore ................................. . 6 6 6 6 3.875 in. 3.875 in. 4.30 in. 4.30 in. Stroke ............................... . (98.4 mm) (98.4 mm) (109.2 mm) (109.2 mm) 5.062 in. 5.062 in. 5.35 in. 5.04 in. (128.6 mm) (128.6 mm) (135.9 mm) (128.0 mm) Displacement .......................... . 358 cu. in. 358 cu. in. 466 cu. in. 436 cu. in. (5.9 L) (5.9 L) (7.6 L) (7.2 L) Cylinder Sleeves ....................... . Wet Wet Wet Wet Alternator and Starter Make . . . . . . . . . . . . . . . Delco-Remy, Motorola or Niehoff Battery Terminal Grounded ................ -----------Negative ----------- CompressionPressure* ................... ----315-340 psi ----385-415 psi (2170-2345 kPA) (2650-2860 kPa) Firing Order ............................ . ----------1-5-3-6-2-4 Valve Clearance- Intake ............................... . -----0.012 in. ----- -----0.025 in. Exhaust ............................. . (0.3 mm) (0.64 mm) -----0.012 in. ----- -----0.025in. ----- (0.3 mm) (0.64 mm) 4

CONDENSED SERVICE DATA (CONT.) GENERAL CaNT. Valve Seat Angle (Degrees)- Intake ............................... . Exhaust.· ............................ . Injection Pump Make .................... . Injection Pump Timing .................. .. Engine Low Idle Rpm .................... . Engine High Idle Rpm, No Load ........... . Engine Full Load Rpm ................... . Rated power (Pto) ...................... .. * Approximate, at sea level, at cranking speed. SIZE-CLEARANCES Crankshaft Main Journal Diameter ......... . Crankpin Diameter ...................... . Camshaft Journal Diameter ............... . Piston Pin Diameter ..................... . Valve Stem Diameter- Intake ............................... . Exhaust ............................. . Main Bearing Diametral Clearance ......... . Rod Bearing Diametral Clearance .......... . Piston Skirt Diametral Clearance .......... . Crankshaft End Play ..................... . Camshaft Bearing Diametral Clearance ..... . Camshaft End Play ...................... . CAPACITIES Cooling System ......................... . Crankcase Oil ........................... . Transmission and Differential ............. . Front Differential Housing . (All-Wheel Drive) ...................... . Front Wheel Hubs (All-Wheel Drive) ...................... . Hi-Clear Rear Axle Housing ............... . 3088 3288 -----45 -----45 ---Robert Bosch --- ---- See Para. 92 3488 Hydro 3688, 3688 Hi·Clear ------30-------- -----45 ----U.T.D.S. ----- -----18°BTDC ----- -----------700 -------------------- ---------------------2MO---------------------- ---------------------2400------------ 80H.P. (59.7 kW) 90 H.P. (67.1 kW) ----3.1484-3.1492 in. -- (79.970-79.990 mm) --~- 2.5185-2.5193 in. -- (63.970-63.990 mm) ---- 2.2813-2.2825 in. -- (57.945-57.975 mm) ---1.4172-1.4173in. -- (35.997-35.999 mm) ---0.3919-0.3923 in. (9.954-9.964 mm) ---0.3911-0.3915 in. (9.934-9.944 mm) ---0.0028-0.0055 in. (0.07-0.14 mm) ---0.0023-0.0048 in. (0.06-0.12 mm) --- 0.0039-0.0047 in. (0.10-0.12 mm) ---0.006-0.009 in. --- (0.15-0.23 mm) --- 0.0010-0.0033 in. (0.025-0.084 mm) ---- 0.004-0.018 in. ---- (0.10-0.46 mm) ----24qts. (22.7 L) -----12 qts. (11.4 L) ----90qts. (85.2 L) 112 H.P. 113 H.P. (83.9 kW) (84.4 kW) --- 3.3742-3.3755 in.--- (85.705-85.738 mm) --- 2.9977-2.9990 in. ---- (76.142-76.175 mm) ----2.2814-2.2825 in. --- (57.948-57.976 mm) ---1.6248-1.6250in. --- (41.270-41.275 mm) --- 0.3718-0.3725 in. (9.444-9.462 mm) ---0.3718-0.3725 in. ----- (9.444-9.462 mm) ---0.0018-0.0051 in. ----- (0.046-0.130 mm) --- 0.0018-0.0051 in. ----- (0.046-0.130 mm) --- 0.0045-0.0065 in. --- (0.114-0.165 mm) --- 0.006-0.012 in. ----- (0.15-0.30 mm) ---0.002-0.0066 in. ----- (0.05-0.167 mm) ----0.005-0.013 in. ---- (0.13-0.33 mm) 30 qts. 27 qts. (28.3 L) (25.6 L) --'----14 qts. (13.2 L) 114 qts. 90 qts. (107.9 L) (85.2 L) --------------llpts. (5.2 L) -------------2.5 pts. ------------ (1.1 L) 4.5 qts. (4.25 L) 5

Paragraphs 1·4 INTERNATIONAL HARVESTER FRONT SYSTEM AXLE TYPE AXLE MAIN MEMBER All Models Except 3688 Hi·Clear 1. REMOVE AND REINSTALL. To remove the axle main member (15-Fig. 1), support front of tractor. Disconnect tie rods (19) from steering arms (7). Remove locating pins from axle exten- sions (9), loosen clamp bolts and remove axle extension, knuckle and wheel assemblies. Disconnect power steering hoses at the front support. Remove center steering arm pivot pin (16) and move steering arm out of front axle. Note any shims on top and bottom of steering arm (3). Position a floor jack under axle main member. Remove lock pins, then drive front and rear pivot pins (6 and 18) in towards steering cylinder. Lower axle main member from tractor. Disconnect and remove steering cylinder and linkage from axle main member. Inspect pivot bushings (5 and 17) and renew as necessary. Bushings (2) in center steering arm (3) can now be renewed if necessary. Reinstall axle main member by reversing removal procedure. Model 3688 Hi·Clear 2. REMOVE AND REINSTALL. Model 3688 high clearance tractors are equipped with a front axle as shown in Fig. 2. Removal procedure for this axle is the same as given in paragraph 1 except that auxiliary stay rods (26-Fig. 2) must be disconnected before removing axle extension and wheel assemblies. TIE RODS AND TOE·IN All Models 3. Removal of tie rods (19-Figs. 1 and 2) on all models is obvious after an examination of the units. Tie rod ends are non-adjustable and faulty units will require renewal. Adjust toe-in on all models to 1/4-inch (6 mm) plus or minus 1I16-inch (1.5 mm). Adjustment is made by varying the length of tie rods. Both rods should be adjusted an equal amount with not more than one turn difference when adjustment is complete. STEERING KNUCKLES All Models 4. Removal of steering knuckles from axle is obvious after an examination of 6 Fig. 1- Exploded view of ad· Justable front axle assembly used on all models except Model 3688 Hi·C/ear tractors. 1. Front axle support 2. Bushings 3. Center steering arm 4. Steering cylinder 5. Bushings 6. Front pivot pin 7. Steering arm 8. Bushings 9. Axle extension 10. Thrust bearing 11. Felt washer 12. Steering knuckle 13. Dust shield 14. Oil seal 15. Axle main member 16. Center arm pivot pin 17. Bushing 18. Rear pivot pin 19. Tie rod (2 used) 20. Tie rod extension 21. Clamp 22. Tube 23. Jam nut 24. Tie rod end the unit and reference to Fig. 3. When renewing steering knuckle bushings (4), be sure to use a suitable piloted driver to prevent damage to bushings. Install bushings so outer ends are below the counterbore on axle extension. Bushings are presized and should not require reaming if carefully installed. Steering knuckle should have an operating Fig. 2-Exploded view of ad· Justable front axle assembly used on Model 3688 HI·C/ear tractors. Except for the following, refer to Fig. 1 for the legend. 25. Stay rod front brackets 26. Auxiliary stay rod (2 used) 27. Ball 28. Rear stay rod bracket 29. Lock plate 30. Cap 31. Shim 32. Ball socket clearance of 0.001-0.006 inch (0.025-0.152 mm) in bushings. Tighten steering arm retaining nut (2) to a torque of 400 ft. -lbs. (540 N' m) and bend locking tab against flat of nut. Tighten wheel hub slotted nut to a torque of 15 ft.-Ibs. (20 N· m) while rotating hub. Then, loosen nut to first slot and install cotter pin.

SERIES 3088·3288·3488 HYDRO·3688 Fig. 3 - Closs·sectlonal view of typical steeling knuckle used on all models. 1. Steering arm 2. Nut 3. Lock plate 4. Bushings 5. Steering knuckle 6. Thrust bearing 7. Felt washer 8. Oil seal 9. Inner bearing 10. Hub 11. Outer bearing FRONT SYSTEM ALL-WHEEL DRIVE All models are available as 4-wheel drive (All-Wheel Drive) units. Elwood front drive axles are used on all models. Elwood front drive axle assembly con- sists of a one-piece center housing hav- ing ball type pivot ends to which steering knuckles are attached. The. steering knuckles and end housings are carried on tapered roller bearings. The axle center housing incorporates a straddle mounted pinion and a four pinion differential gear unit. Drive shafts extend outward from the differential and attach to planetary type end housings. The shafts pivot on universal joints located inside the steering knuckles. The planetary gears are carried on needle bearings. Power for the front drive axle is taken from a transfer case which is bolted to left side of tractor rear frame and driven by an idler gear on reverse idler shaft of the range transmission. The transfer case and front drive axle are connected by a two-piece drive shaft fitted with three conventional universal joints and a slip joint which compensates for oscilla- tion of front axle. The transfer case contains the hydraulically operated clutch which per- mits the front drive axle to be engaged or disengaged while tractor is in motion. This clutch is designed to be torque limiting to prevent damage to front drive axle in overload conditions. Pressurized hydraulic oil is furnished to the clutch through an electric solenoid controlled hydraulic valve. Front and rear tire size combinations are set to match front drive axle gear ratio. Therefore, it is essential that correct front and rear tire sizes be used. If a change in tire sizes is contemplated, con- tact your local dealer for information concerning proper combinations. WHEEL AND PIVOT BEARINGS Models So Equipped 5. WHEEL BEARINGS. Front wheel planetary hubs should be drained and refIlled with IH 135H EP gear lube or equivalent SAE 85W-140 multi- purpose gear lube after the first 50 hours and after every 500 hours of operation thereafter. Removal of wheel bearings requires removal of wheel hub and planetary assembly. To remove wheel bearings, refer to Fig. 4 and proceed as follows: Support tractor front axle assembly and remove front wheels. Using a center punch, index planetary housing flange (43) to wheel hub (31). Drain oil from planetary housing, then remove retaining nuts from planetary housing flange. Using three jackscrews, split planetary assembly from hub. Remove tapered dowels (40), then remove planetary assembly from hub. Remove snap ring (45) from axle shaft end, then remove sun gear (46), spacer (47) and ring gear Paragraphs 5·6 (48). Attach a lifting eye and hoist to wheel hub, remove lockm.zts from spindle shaft flange (3), and remove hub (31) from steering knuckle (8). Loosen cap screw on bearing locknut (25) and remove locknut from shaft. NOTE: Locknut Is pOSitioned with recess holes away from bearing. Recess holes are for tightening purposes using a spanner wrench or punch. See Fig. 6. Support wheel hub across two wood blocks and drive spindle shaft (3 - Fig. 4) out of hub using a wood block. Lift inner bearing (26) out of hub. Remove oil seal (34) and outer bearing (33) from hub. Us- ing a brass drift, drive out inner and outer bearing cups. Inspect spindle shaft oil seal (17) and bushing (4) and renew if necessary. NOTE: Use a blind hole puller to remove spindle from shaft bushing. Clean and inspect all parts and renew as necessary. If renewal of spindle shaft bushing (4) is necessary, bushing must be driven in until it bottoms in the counterbore. Reassemble and adjust spindle and wheel bearings as follows: Install outer wheel hub bearing (33) and oil seal (34). Install spindle shaft (3), oil deflector (1) and spacer (2). See Fig. 7. Install inner wheel hub bearing (26-Fig. 4) and tighten bearing nut (25) to preload bearings to a rolling torque of 8 to 16 pounds (3.6 to 7.3 kg), using a spring scale as shown in Fig. 8. Mount spindle and hub assembly on axle housing flange and seal with gasket material or silicone sealant such as Dow Corning RTV-732 or equivalent. Install nuts and tighten to a torque of 65-70 ft.-Ibs. (90-95 N ·m). Place ring gear, spacer and sun gear in hub housing and install snap ring. Install planetary assembly into hub and use new gasket (28-Fig. 4). Install tapered dowels on studs, then install nuts and tighten to a torque of 65-70 ft.-Ibs (90-95 N ·m). Turn hub until arrow is pointing downward, then fUl housing with lubricant until it runs out of the fIller hole. Install fIller hole plug. 6. PIVOT BEARINGS. To remove the pivot bearings, the planetary wheel hub asse~ly must be removed. Pull axle out of axle housing and remove with hub assembly. Remove cap screwi on steering knuckle and separate retainers, seals and gaskets of steering knuckle as shown in Fig. 9. Disconnect tie rod from steering knuckle and on right side only, disconnect steering cylinder from steering knuckle. Identify and remove upper pivot bearing cap and shims and lower pivot bearing cap and shims. Remove 7

Paragraph 6 Cont. upper and lower pivot bearings (1 and 5-Fig. 10) and lift off steering knuckle (12). Inspect bearing cones and cups for wear and renew as necessary. Lubricate pivot bearings and reinstall steering knuckle. Install upper and lower bearing caps usipg original shim packs. Tighten upper and lower bearing cap retaining nuts to a torque of 60-70 ft.-lbs. (81-95 N· m). Check bearing preload by placing torque wrench on upper bearing cap nut and swinging steering knuckle from side INTERNATIONAL HARVESTER to side. Proper adjustment should require 15-25 ft.-lbs. (20-34 N • m) of torque to pivot steering knuckle. Add or remove upper or lower bearing shims until specified torque is obtained. Shims are available in thicknesses of 0.005 and 0.010 inch. Bearing preload should be checked without ball seals or hub com- ponents installed. Install new axle shaft oil seal until it bottoms in counterbore. Install gasket, felt retainer, felt seal, oil seal with spring, seal retainer and split retaining Fig. 5 - View showing remo"al of snap ring that secures ring gear, sun gear and spacer In wheel hub. 1. Ring gear 2. Snap ring 3. Sun gear Fig. 6 - View showing bearing locknut with recess holes facing away from bearing. Recess holes (1) are for tightening purposes using a punch and hammer or a spanner wrench. 1. Recess holes 2. Cap screw Fig. 4 - Exploded ,,'ew of Elwood "All Wheel DrI"e" axle end housing and steering knuckle assembly. 1. Oil deflector 13. Tension spring 2. Spacer 14. Seal retainer 3. Spindle shaft 15. Split retainer 4. Bushing 5. Pivot bushing 16. Pivot pin 17. Oil seal 6. Top bearing cap 18. Oil seal 7. Shim 19. Shaft 8. Steering knuckle 20. Cage 9. Gasket 21. Snap ring 10. Felt retainer 22. Race 11. Felt seal 23. Ball 12. Oil seal 24. Shaft 8 25. Locknut 26. Bearing cone 27. Bearing cup 28. Gasket 29. Lug nut 30. Wheel stud 31. Hub 32. Bearing cup 33. Bearing cone 34. Oil seal 35. Planet gear 36. Washer 37. Needle bearing 38. Washer 39. Planet gear pin 40. Tapered dowel 41. Plug 42. Lubrication fitting 43. Planetary drive flange 44. Thrust washer 45. Snap ring 46. Sun gear 47. FIat spacer 48. Ring gear Fig. 7 - Use wooden block and hammer to install spindle shaft (1), spacer (2) and 011 deflector (3) into wheel hub. Refer to text.

SERIES 3088·3288·3488 HYDRO·3688 ring halves on rear of steering knuckle. See Fig. 9. Install lockwashers and mounting bolts and torque bolts to 10-15 ft.-lbs. (15-20 N ·m). Pack inside of ball Fig. 8- View showing use of cord and spring scale to measure bearing preload by means of roiling torque. Refer to text Fig. 9- View showing placement order of re· talners, seals and gaskets used on steering knuckle. 1. Outer split retainer 2. Seal retainer 3. Oil seal 1-& 2~ 4. Felt seal 5. Felt retainer 6. Gasket with good grade multi-purpose lithium grease and install axle, spindle anQ. hub assembly. NOTE: When Installing axle shaft, be careful not to damage axle shaft 011 seal. When connecting tie rod to steering knuckle, tighten slotted nut securely until slot in nut aligns with hole in pin, then install cotter pin. Remainder of assembly is reverse· of disassembly procedure. FRONT DRIVE AXLE Models So Equipped 7. R&R AXLE ASSEMBLY. To remove the "All-Wheel Drive" front axle assembly, disconnect hydraulic lines to steering cylinder and plug all hydraulic openings. Remove "U" bolts from drive shaft front universal joint, separate joint and tie front end of drive shaft up out of the way. Using two floor jacks, place one under differential housing and the other under steering cylinder mounting bracket. Support front of tractor with suitable jackstands and remove front wheels. Remove lock pins, then drive out pivot pins (6 and 9-Fig. 10). Lower drive axle assembly and remove assembly from under front of tractor. Reinstall by reversing the removal procedure. 8. OVERHAUL. Overhaul of front drive axle assembly can be accomplished in three separate operations; planetary assembly, drive axle universal joint and differential. The planetary assembly and drive axle operations can be accomplished without removal of complete axle assembly from tractor. The differential overhaul will be easier if front drive axle is removed from tractor. 9. PLANETARY ASSEMBLY. Plan- etary assembly can be overhauled as Fig. 10- Partially exploded view of Elwood front drive axle. 1. Pivot bearing cone (upper) 3 I 12 ~ 2. Bearing cup 3. Steering stops 4. Bearing cup 5. Pivot bearing cone (lower) 6. Front pivot pin 7. Washers 8. Pivot bushings 9. Rear pivot pin 10. Axle housing 11. Breather 12. Steering knuckle assy. 13. Tie rod ends 14. Tie rod Paragraphs 7·9 follows: Remove planetary housing flange (43-Fig. 4) from wheel hub (31) as outlined in paragraph 5: Drive roll pin (I-Fig. 11) from planet gear pin with small punch. Remove planet pin and gear. NOTE: The planet pin serves as the In· ner race for needle bearings; Inside the planet gear. Therefore, the planet pin must be absolutely smooth. See Fig. 12. Remove needle bearings and spacer from planet gear. The spacer is located between two rows of needle bearings inside the planet gear. Remove other two planet gears in same manner. Fig. 11- View showing removal of roll pin from planet gear pin. 1. Roll pin 2. Planetary flange assy. Fig. 12 - Removal of planet gear and planet gear pin. Pin must be absolutely smooth. Note needle bearings Inside planet gear. 1. Planet gear pin 2. Planet gear 9

Paragraphs 10·11 Clean and inspect all parts and renew any showing excessive wear or other damage. Assembly is the reverse of disassembly. Tighten planetary housing flange retaining nuts to a torque of 65-70 ft.~lbs. (90-95 Nom). 10. DRIVE AXLE SHAFT AND "U" JOINT. Overhaul of axle drive shaft and universal joint is as follows: Remove planetary assembly, wheel hub and shaft spindle as outlined in paragraph 5. Pull axle shaft assembly from front drive axle housing. Place inner axle in a soft jawed vise. Hold outer shaft end and strike backside of joint housing with it soft faced hammer as shown in Fig. 13. Remove lock ring from shaft and discard. Use new lock ring when reassembling. See Fig. 14. Tilt inner race as shown in Fig. 15 until one ball bearing can be removed. Repeat this procedure removing all ball bearings. Rotate universal joint cage 180 degrees to the outer race bell. Roll cage until the two elongated slots in cage align with Fig. 13- Tap back face of universal Joint on axle shaft (1) to gain access to letalnlng ling. Fig. 14- View of dll"e axle universal Joint show· Ing retaining ling (1). Renew ling upon leassembly. Refer to text 10 INTERNATIONAL HARVESTER opposite teeth of outer race bell. Refer· to Fig. 16 and lift out ball cage. Turn inner race in the ball cage at a right angle. Align notched tooth of inner race with the elongated slot in ball cage and roll out inner race. See Fig. 17. Clean and inspect all parts. Renew any worn or damaged parts. Repack universal joint with good grade lithium base grease'. Reassemble by reversing the disassembly procedure. 11. DIFFERENTIAL UNIT. To remove differential unit, remove front drive axle as follows: Disconnect hydraulic lines from steering cylinder and plug all hydraulic openings. Remove "U" bolts from front drive shaft universal joint, separate joint and tie front of drive shaft up out of the way. Using two floor jacks, place one under differential housing and the other under steering cylinder mounting bracket. Support front of tractor with suitable jackstands and remove front wheels. Disconnect tie rod ends and remove tie rod. On right side, disconnect steering cylinder from steering knuckle. Identify and remove upper pivot bearing cap and shims and lower pivot bearing cap and shims. Remove upper and lower pivot bearings and lift off planetary and steering knuckle assemblies. Remove lock pins and drive out axle pivot pins. Lower drive axle assembly and remove assembly from under tractor. With axle center unit removed, remove differential hex nuts and tapered dowels. Using a suitable hoist, lift differential assembly from axle housing. Remove thrust screw and bronze thrust pad (2 and 3 - Fig. 18) from side of housing. NOTE: Bronze pad is a separate ser- viceable item. Fig. 15 - Rotate bealing cage in lace bell and remove ball as shown. Repeat rotation fOl removal of all balls. 1. Ball 3. Bearing cage 2. Inner race Using a center punch, index bearing cap and carrier for aid in correct reassembly as shown in Fig. 19. Remove adjusting ring lock clips (25-Fig. 18) from top of bearing caps. Remove bearing cap mounting bolts and lockwashers, then lift off bearing caps. Place a piece of pipe through differential carrier and hoist out assembly as shown in Fig. 20. Place unit on a clean work bench and remove bearing adjusting nuts (4-Fig. 18) and bearing cups (15). Remove differential bearing cones (16) using a suitable puller. Index differential halves to ring gear to assure correct wear pattern on reassembly. Remove mounting bolts securing differential and ring gear, then separate differential halves. Remove pinion gears (20-Fig. 18), side gears (18), thrust washers (19) and spider unit (21). Remove slotted nut (8) and yoke (6). Unbolt and remove bearing retainer (5). Remove and renew oil seal (9). Tap rear side of pinion shaft with Fig. 16- View showing rotation of ball cage In bell fOl removal. Refel to text. 1. Ball cage 2. Outer race bell Fig. 17- View of ball cage showing small tooth of innel lace (2) In elongated slot (1) of ball cage. Refel to text.

IH 3088, 3288, 3488 Hydro & 3688 Tractor Service Repair Shop Manual - IMPROVED -

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