J.I. Case 770, 870, 970, 1070, 1090, 1170, 1175 Tractor Service & Repair Manual

SHOP MANUAL d. I. CASE SERIES 770, 870, 970, 1070, 1090, 1170, 1175 IDENTIFICATION The serial number is stamped on left side of steering support (firewall) and engine serial number on right rear of cylinder block INDEX (By Starting Paragraph) 770 870 970 1070 1090 AXLE, FRONT ........................ BRAKES Master Cylinder (Manual) ...... . .. . ... 157 157 157 157 Master Cylinder (Power) .............. 162 162 162 162 162 Brake Unit .......................... 168 168 168 168 171 Parking Brake ....... . ......... . ..... 173 173 173 173 175 CLUTCH Engine Clutch ......... . .. . ......... 100 100 100 100 100 Power Take-Off Clutch .......... . .... 184 184 184 184 184 Torque Limiting Clutch .......... . ... 117 117 117 117 117 COOLING SYSTEM Radiator ........................ . .. 86 86 86 86 86 Thermostat ................. . ... . .. . 87 87 87 87 87 Water Pump ........................ 88 88 88 88 88 DIESEL FUEL SYSTEM Bleeding .................. . ........ 70 70 70 70 70 Filters and Lines .................... 67 67 67 67 67 Injection Pump ...... . ...... . .. . .... 71 71 71 71 71 Injector Nozzles ..................... 75 75 75 75 75 Timing ............................. 72 72 72 72 72 DIESEL TURBOCHARGER ......... . ... . DIFFERENTIAL ...................... . 141 141 143 143 145 2 1170 1175 157 162 162 171 168, 171 175 173, 175 100 100 184 184 86 86 87 87 88 88 70 70 67 67 71 71 75 75 72 72 61 61 147 143, 147

INDEX (Cont'd) 770 870 970 1070 1090 1170 1175 ELECTRICAL SYSTEM Alternator and Regulator ........ ... .. 94 94 94 94 94 94 94 , 97 Circuit Description .................. 90 90 90 90 90 90 90 Distributor ............ . ...... . ..... 91 91 91 Starting Motor ............... . ...... 99 99 99 99 99 99 99 ENGINE Cam Followers .............. .. ...... 34 34 34 34 34 34 34 Camshaft .................. . ....... 40 40 40 40 40 40 40 Connecting Rods & Bearings ......... 47 47 47 47 47 47 47 Crankshaft & Bearings .. .. ........ .. . 48 48 48 48 48 48 48 Counter-Balancer ..... . ... .. . . . . . . . . . 49 49 Cylinder Heads ...... . .............. 28 28 28 28 28 28 28 Cylinder Sleeves .............. . ..... 44 44 44 44 44 44 44 Flywheel .. .. ....... . ......... 55 55 55 55 55 55 55 Main Bearings ... ... .. .. ..... . ...... 48 48 48 48 48 48 48 Oil Pan .... ................ . ... . ... 56 56 56 56 56 56 56 Oil Pump. . . . . . . . . . . . . . . . . . ••• • • 0 ••• 57 57 58 58 58 58 58 Piston & Rod Removal ............... 42 42 42 42 42 42 42 Piston Pins & Bushings ....... ....... 46 46 46 46 46 46 46 Pistons, Rings & Sleeves ..... . ...... 43 43 43 43 43 43 43 Remove & Reinstall ........ ... ...... 25 25 25 25 25 25 25 Timing Gear Cover ......... • 0 • • • • • • • 35 35 35 35 35 35 35 Timing Gears ................. ... ... 36 36 36 36 36 36 36 Valve Adjustment ............ . ... ... 29 29 29 29 29 29 29 Valve Guides & Springs .. .. .. . ..... .. 31 31 31 31 31 31 31 Valves & Seats ........... . ... . ..... . 30 30 30 30 30 30 30 FINAL DRIVES ................... . .... 155 155 155 155 155 151 151 FRONT SYSTEM Axle & Support ............... .. .... 2 2 2 2 2 2 2 Dual Wheel Tricycle . .. ........ 1 1 1 1 1 1 1 GOVERNOR (NON-DIESEL) ... . .. . ...... 83 83 83 HYDRAULIC SYSTEM Operation .. ... . ....... . .... .. 189 189 189 189 189 189 189 Testing . .... ...... .... .. . ........ .. 190 190 190 190 190 190 190 Pump .. . ............. . .. . ... .. . .... 191 191 191 191 191 191 191 Dual Remote Valve ... .. ... . .. . ...... 193 193 193 193 193 193 193 Draft-0-Matic Valve ........ • • ' • •• 0 ••• 196 196 196 196 196 196 196 Rockshaft & Linkage . .... ... . ....... 198 198 198 198 198 198 198 Work Cylinders & Couplings .. .... ... . 207 207 207 207 207 207 207 POWER SHIFT CLUTCH Adjustment .... .. ... ... . . . . . . . . 113 113 113 113 113 Operation ... • • • ••••• 0 •••• • • ••• • •••• 111 111 111 111 111 Overhaul. ......... . .. .. .. .. .. .. .... 121 121 121 121 121 Remove & Reinstall .......... . ... . .. 116 116 116 116 116 POWER TAKE-OFF Clutch .......... . . . . . . ' . ..... 184 184 184 184 184 184 184 Housing & Gears. ••••••• 0 ••••• • •••• 0 183 183 183 183 183 183 183 STEERING GEAR ..... ... ....... . ..... 5 5 5 5 5 5 5 TRANSMISSION .. ............. . ...... 130 130 130 130 130 130 130 3

CONDENSED SERVICE DATA ---Gasoline Models-- Diesel Models 1070 & Tractor Series 770 870 970 770 870 970 1090 1170 1175 GENERAL Engine Make .............. Own Own Own Own Own Own Own Own Own Engine Model ............. 251 BG 301 BG 377BG 267BD 336BD 401 BD 451 BD 451 BOT 451 BOT Cylinders, Number of ...... 4 4 6 4 4 6 6 6 6 Bore-Inches .............. 4 4-3/8 4 4-1/8 4-5/8 4-1/8 4-3/8 4-3/8 4-3/8 Stroke-Inches ............ 5 5 5 5 5 5 5 5 5 Displacement-Cu. ln ...... 251 301 377 267 336 401 451 451 451 Com pression Ratio ......... 7.5: 1 7.5: 1 7.5: 1 16.5: 1 16.5: 1 16.5: 1 16.5: 1 16.5: 1 15.8: 1 Rated Horsepower ......... 93.5 108.1 Main Bearings, No. of ...... 5 5 7 5 5 7 7 7 7 Cylinder Sleeves- Type ..... Wet Wet Wet Wet Wet Wet Wet Wet Wet Forward Speeds . . ......... 8(12*) 8(12*) 8(12*) 8(12*) 8(12•*) 8(12*) 8(12*) 8 8 *12 Forward Speeds on Power Shift Models. TUNE-UP Firing Order .......... • .... 1-3-4-2 1-3-4-2 1-5-3-6-2-4 1-3-4-2 1-3-4-2 1-5-3-6-2-4 1-5-3-6-2-4 1-5-3-6-2-4 1-5-3-6-2-4 Valve Tappet Gap Intake .......... . ....... 0.015C 0.015C 0.015C 0.015C 0.015C 0.015C 0.015C 0.015C 0.015C Exhaust .......... . ..... 0.025C 0.025C 0.025C 0.025C 0.025C 0.025C 0.025C 0.025C 0.025C Compression at Cranking Speeds PSI ............. 140 140 140 400 400 400 400 400 400 Ignition Distributor Make ............... . ... Prestolite Prestolite Prestolite Breaker Gap ............. 0.020 0.020 0.020 Static Timing ............ 5°ATC 5oATC TDC Running Timing ......... 28°BTC 28° BTC 27°BTC Timing Mark Location ...... Flywheel Spark Plug Gap ............ 0.025 0.025 0.025 Injection Pump Make ............ . ... . .. R. Bosch R. Bosch R. Bosch R. Bosch R. Bosch R. Bosch Model .................. PES PES PES PES PES PES Timing ................. 29 BTC 29 BTC 29 BTC 30 BTC 30 BTC 30 BTC Injection Nozzles Make ................... Roosa Master Orifice Size ............. 0.013 Valve Lift Adj ............ 0.0135 (3;4 turn) Opening Pressure-PSI ... 3150-3250 psi Turbocharger Make ......... Garrett Garrett Engine Governed Speeds Slow Idle ............... 600 600 600 725 725 725 725 725 725 High Idle ....... . ....... 2060 2060 2060 2040 2040 2040 2040 2260 2260 (2160*) Rated Load ............. 1900 1900 1900 1900 1900 1900 1900 2100 2100 (2000*) Battery Terminal Grounded Neg. Neg. Neg. Neg. Neg. Neg. Neg. Neg. Neg. *On Model 1090 LIQUID CAPACITIES Cooling Systems-Qts ...... 28 28 38 28 28 38 38(40*) 40 40 Crankcase-Qts. (WI Filter) . 9 9 13 9 9 13 13 13 17 Transmission & Hyd. System Manual Shift Qts ......... 68 68 64 68 68 64 64 64 64 Power Shift Qts .......... 64 64 64 64 64 64 64 Planetary Final Drive (Qts. Ea.) ............... 8% 10 Fuel Tank-Gallons ........ 50 50 50 50 50 50 50 50 50 *On Model 1090 4

J.l. CASE DUAL WHEEL TRICYCLE Models So Equipped 1. The dual wheel tricycle pedestal attaches to steering motor shaft flange. To remove the unit, support front of tractor and remove the attaching cap screws. Install by reversing the removal procedure. Tighten the retaining cap screws to a torque of 225-250 ft.-lbs. Refer to Fig. 1 for exploded view of dual wheel pedestal and associated parts. Fig. 1-Exploded view of tricycle pedestal and associated parts used on all models so equipped. 1. Pedestal 6. Outer seal 2. Woodruff key 7. Inner bearing 3. Spindle 4. Snap ring 8. Hub 9. Outer bearing 5. Inner seal 10. Nut FRONT SYSTEMS ADJUSTABLE AXLE AND SUPPORT Models So Equipped 2. STEERING KNUCKLES. Steering spindles ride in renewable, presized bushings on 1090 and 1170 Models, and needle roller bearings on all other types. On bushing type refer to Fig. 2. Press upper bushing into axle ex- tension until flush with bushing bore as shown at (A). Press in the seal as shown until it bottoms and distance (B) measures 1/16-inch. Press lower bushing in until flush with bore as shown at (C). Temporarily install steering arm without shims and measure clearance (D), then install shims equal to the measured clearance less 0.040-0.060 to provide the correct spindle end play. Install steering arm with outer end pointing rearward and outward at about an angle of approximately 80° from spindle centerline as shown at (E). Tighten steering arm cap screws to a torque of 250-300 ft.-lbs., which should reduce spindle end play to 0.010-0.030. Shims are available in thicknesses of 0.036, 0.060 and 0.135. Make sure spindle does not bind after retaining cap screw is tightened. On needle bearing type, refer to Fig. 3. Pressing on lettered end, install upper needle bearing until distance (1) from top of bearing to end of bore Paragraphs 1-2 measures 13/32-inch, then install seal until distance (2) measures 5/32-inch. Install lower needle bearing until distance (3) measures 1/32-inch. Tempo- rarily install steering arm without shims and measure clearance (4), then install shims equal to measured clearance minus 0.040-0.060. Steering arm should point to rear and out at about an 80° angle as shown at (E-Fig. 2). Tighten steering arm retaining cap screw to a torque of 250-300 ft.-lbs., which should reduce spindle shaft end Fig. 4-0n tractors with external power steering cylinders, toe-in is correct when spindle is against stop as shown at (A) and distance (8) between lower center arm and cross member measures 1 /8-inch. Adjust anchor nuts (C) if cylinders bottom when fully retracted or extended. Fig. 2-Cross sectional view of bushing type steering knuckle used on Series A. Bushing height (flush) Fig. 3-Cross sectional view of needle bearing type steering knuckle used on Series 770, 870, 970, B. Seal height (1/16 inch) C. Bushing height (flush) D. End clearance (shim to 0.050) 1. Bearing depth (13/32-inch) 2. Seal depth (5/32-inch) 3. Bearing depth (l/32-inch) 1090 anci 1170. E. Installation angle (80°) 1070 and 1175. 4. End clearance (shim to 0.020) 5 I

Paragraphs 3-8 play to 0.010-0.030. Shims are available in thicknesses of 0.036, 0.060 and 0.135. 3. TIE RODS AND TOE-IN (EX- TERNAL). To adjust the tie rods on tractors with external power steering cylinders, refer to Fig. 4. Turn steering wheel to right until left spindle stop contacts axle stop as shown at (A); then adjust left tie rod until clearance (B) between center steering arm and cross member plate is 1/8-inch. Turn steering wheel fully left and repeat the adjustment on right tie rod. NOTE: It may be necessary to adjust steering cylinder anchor nuts (C) if cylinders reach limit of their travel before 1/8-inch clearance (B) is ob- tained. Toe-In should be 1/8-1/2 inch when adjustment is completed. 4. TIE RODS AND TOE-IN (IN- TERNAL). On tractors with internal po'wer steering cylinders, toe-in should be l/4-3/8 inch; adjust as follows: Turn steering wheel in either direction until steering motor limit stops contact as shown at (1--Fig. 5); then adjust the appropriate tie rod until spindle stop clearance (2) is 0.003-0.009. Turn steering wheel fully in opposite direction and adjust the other tie rod. On all models, tighten tie rod jam nuts to a torque of 150 ft.-lbs. and tie rod clamp bolts to 65 ft.-lbs. POWER STEERING SYSTEM All models are equipped with hydrostatic power steering using a Ross steering unit and a section of the main hydraulic system pump as the power source. Model 1175 has the steering control valve built-in to steering unit. Turning power is delivered to the wheels by an actuator (steering motor) Fig. 5-0n tractors with internal power steering cylinders (steering actuator motor), clearance (2) at spindle stop should be 0.003-0.009 when center steering arm is against ,;top as shown at (1). Toe-in should be 1/4-3/8 inch. 6 on Models 770, 870, 970, 1070 and late 1175; and by two double acting cylinders on Models 1090, 1170 and early 1175. LUBRICATION AND BLEEDING All Models 5. The transmission and hydraulic system fluid is used, and sight gages located on left side of transmission indicate fluid level; refer to Fig. 8. Use only CASE TCH fluid or Automatic Transmission Fluid- Type "A". Refer to CONDENSED SERVICE DATA Tables for reservoir capacity and to paragraph 162 for additional hydraulic system information. Steering hydraulic circuit is com- bined with brake circuit and filter unit is located on right side of clutch housing (forward of power shift filter on Power Shift Models). On 770, 870, 970, 1070 and 1175 Models, renew filter element each 240 hours using a 25 micron filter. Models 1090 and 1170 are provided with a dash-mounted warning light, and filter element should be renewed when warning light flashes, using a 10 micron element. To bleed the steering hydraulic system, run engine at half throttle and turn steering wheel from lock to lock several times until steering action is firm and solid. Brake hydraulic system may also need to be bled as outlined in paragraph 164. Do not hold front wheels against steering stops unneces- sarily when bleeding system. Fig. 6-Exploded view of front axle center member and associated parts used on Series 1090, 1170 and early 1175. J.l. CASE TROUBLE SHOOTING All Models 6. LEAKAGE. Internal leakage in the steering system can generally be ignored unless sufficient to cause slow or erratic steering. Leakage at recirculating check valve ball in steering control valve or manual steering pump on Model 1175 will not affect manual steering but can cause loss of power assist. Internal leakage in manual pump will not materially affect power steering but may not allow the tractor to be steered manually. 7. STEERING CONTROL VALVE. On all models except 1175 if unusual initial effort is required to start the turn, a partially sticking control valve may be indicated and valve assembly should be removed and overhauled as outlined in paragraph 18. Because considerable pressure can be exerted by the hand pump, the control valve will rarely completely stick or freeze. 8. FRONT WHEEL SHIMMY. On all models except 1175 if the front wheels shimmy, the trouble is probably caused by a broken or weak control valve centering spring or bent centering Fig. 7-Exploded view of front axle center member and associated parts used on Series 770, 870, 970, 1070, and late 1175. Fig . 8-Sight glasses are used on left side of transmission housing to indicate fluid level.

J.l. CASE spring washers. Another possible cause is worn, broken or damaged steering linkage. 9. HARD STEERING. Hard steering may be caused by a malfunctioning system relief valve or pump, or binding in steering linkage. SYSTEM OPERATING PRESSURE All Models 10. The power steering operating Fig. 9-Schematic view of power steering hydraulic circuit and associated parts used on models with steering actuator. Relief valve housing (3) is used only on models equipped with manual hydraulic brakes; steering relief valve is located in brake valve (4) on models with power brakes. Item 5 is an internal part of the manual pump (6) on Model1175. 1. Pump 5. Control valve 2. Filter 3. Relief valve 6. Manual pump 7. Oil cooler 4. Power brake valve 8. Actuator (motor) pressure is controlled by a relief valve (3-Fig. 9) on models with manual hydraulic brakes; or contained in brake valve housing (4--Fig. 9 or 10) on other models. Relief pressure should be 1800-2000 psi. Recommended test method is by use of a flow meter as outlined in paragraph 190, or by teeing a suitable test gage in pressure line. Adjustment is by adding or removing shims (S-Fig. 11 or 12). Shims are available in thicknesses of 0.015 and 0.033 for models with manual hydraulic brakes; or 0.010, 0.050 and 0.100 for other models. Seal kits are available for the individual relief valve unit or brake valve. HYDRAULIC PUMP All Models The main hydraulic pump is used as the power source. Refer to paragraph 190 for testing, paragraph 191 for re moval and installation and to paragraph 192 for pump overhaul. MANUAL PUMP All Models Except 1175 11. REMOVE AND REINSTALL. To remove the manual steering pump, first disconnect manual pump hydraulic hoses and remove the four cap screws securing manual pump to steering column flange. On Adjustable Steering Shaft Models, loosen lock knob by turning counterclockwise. On Rigid Steering Shaft Models, remove medallion, nut and steering wheel, using a suitable puller. On all models, lower the pump and steering column shaft until retaining Fig. 10-Schematic view of steering hydraulic circuit used on models with external cylinders. Item 5 is an internal part of the manual pump (6) on model 1175. Refer to Fig. 9 for components identification except for: 9. Center steering arm 10. Steering cylinders Paragraphs 9-12 spring pin is exposed, drive out the pin and lift off the pump. Install by reversing the removal procedure. Tighten steering wheel nut to a torque of 30-35 ft.-lbs. and pump flange cap screws to 17-20 ft.-lbs. 12. OVERHAUL. Lightly clamp the manual pump in a protected vise, end plate up. Remove the seven retaining cap screws and lift off end plate (2-Fig. 13), seal retainer (3), seal (4) and rotor assembly (5 through 8). Examine exposed end of shaft (14) for paint, rust or burrs. Remove any 0 0 tj I 0 ~ Fig. 11-Exploded view of steering relief valve housing showing pressure adjusting shims (S). Fig. 12-Power brake valve housing showing steering relief valve. Pressure adjusting shims are (S). 7

Paragraphs 13-14 irregularities, then push shaft (14), drive pins (13), commutator drive pin (12), drive link (11) and commutator (10) up out of body (17). Thrust bearing (15 & 16) may be removed with shaft or may be lifted out at a later time. Remove seal assembly (19) and snap ring (20) from upper end of housing and renew the seal when unit is reassembled. Do not remove needle roller bearing (18) unless renewal is indicated. Press new bearing in, if renewed, until distance (A-Fig. 14) from lower edge of bearing to machined end of housing measures 3-27/32 inches. Bearing should be pressed into housing from lower (rotor) end. Examine machined surfaces of stator, rotor and vanes as shown in Fig. 15. Measure thickness of each part as shown at (A & B). All measurements must be equal within 0.002. Height of vanes should not be less than 0.25. Po- sition springs arch upward on a surface plate as shown at (C); height of arch should measure 0.080-0.100. Maximum clearance (D) between stator and installed rotor should not exceed 0.007. Rotor, stator and vanes are available in Fig. 14-0n all models except 1175, needle bearing is properly installed in housing when distance (A) measures 3-27/32 inches. 8 Fig. 13-Exploded view of ROSS hydrostatic steering manual pump of the type used on all models except 1175. 1. Cap screw 2. End plate 3. Seal retainer 4. Seal 5. Pump rotor 6. Spring 7. Vane 8. Stator 9. Spacer plate 10. Commutator 11. Link 12. Commutator pin 13. Drive pin 14. Drive shaft 15. Thrust bearing 17. Body 18. Needle bearing 19. Seal assembly 20. Snap ring a kit which includes all three items; however, vane springs (6-Fig. 13) are available separately. Renew the kit if any parts are damaged. Clearance between big end of drive shaft (14) and corresponding bore in housing (17) should not exceed 0.006. Drive pins (13) should be a snug fit in link (11). Lubricate all parts in CASE TCH oil and assemble by reversing dis- assembly procedure, omitting shaft seal. Use a small amount of grease to hold commutator pin (12) in commutator (10) and install commutator with a twisting motion, making certain commutator pin (12) enters one of the slots in shaft at end of link pin (13). Commutator will not bottom if commutator pin enters the third (shallow) slot. Commutator is correctly installed when bottom edge is slightly recessed in body bore. Make sure rotor parts and end plates are absolutely clean when they are installed. Tighten all cap screws (1) finger tight then torque evenly to 18-22 ft.-lbs. Rotate pump shaft to test the assembly. Some drag is normal but assembly should not bind. If binding is noted, loosen cap screws and retest, then retighten cap screws. Disassemble and inspect if binding persists. Install a new seal kit and snap ring (20) after pump is assembled. Turn unit on side with hose ports upward, then slowly pour CASE TCH oil in one port (keep port full) while turning shaft, until oil appears at the other port. Plug the ports to prevent dirt entry during installation. Model 1175 13. REMOVE AND REINSTALL. To remove manual steering pump, first disconnect manual pump hydraulic hoses and remove the four cap screws securing manual pump to pump mount- ing brackets. Disconnect steering pump from universal joint by removing "E" J.l. CASE rings and pulling pin. Plug the steering pump ports. Install by reversing the removal procedure. 14. OVERHAUL. To disassemble the removed manual pump and control valve assembly, refer to Fig. 16 and proceed as follows: Install a fitting in one of the four ports in valve body (29), then clamp fitting in a vise so that input shaft (15) is pointing downward. Remove the seven cap screws and end cover (46). NOTE: Lapped surfaces on end cover (46), commutator set (41 and 42), manifold (40), stator and rotor (36 and 39), spacer (34) and valve body (29) must be protected from scratching, burring or any other damage as sealing of these parts depends on their finish and flatness. Remove seal retainer (44) and seal (43), then carefully remove wear washer (45), commutator set (41 and 42) and manifold (40). Grasp spacer (34) and lift off the spacer drive link (35) and stator-rotor set (36, 37, 38 and 39) as an assembly. Separate spacer and drive link from stator-rotor set. Remove unit from vise, then clamp fitting in vise so that input shaft is pointing upward. Remove shield (1). Place a light mark on flange of upper cover (6) and valve body (29) for aid in reassembly. Unbolt upper cover from valve body, then grasp input shaft and remove input shaft, upper cover and valve spool assembly. Remove and Fig. 15-0n all models except 1175, examine rotor, stator and vanes for scoring, nicks and burrs. A. Thickness of stator and rotor must be equal within 0.002. B. Vane thickness must equal rotor thickness within 0.002 and vane height must not be less than 0.250. C. Spring arch should be 0.080-0.100 when measured as shown. D. Rotor to stator clearance should not exceed 0.007 when measured as shown.

J.l. CASE discard seal ring (7). Slide upper cover assembly from input shaft and remove spacer (26). Remove shims (9) from cavity in upper cover or from face of thrust washer (11) and note number of shims for aid in reassembly. Remove snap ring (2), spacer (3), seal (4) and seal (5). Retain spacer (3) and snap ring (2) for reassembly. Do not remove needle bearing (8) unless renewal is required. Remove snap ring (10), thrust washer (11), spring washer (12), thrust bearing (13) and thrust washer (14) from input shaft. Drive out pin (16) and withdraw torsion bar (21) and spacer (20). Place end of valve spool on top of bench and rotate input shaft until drive ring (19) falls free, then rotate input shaft clockwise until actuator ball (17) is disengaged from helical groove in input shaft. Withdraw input shaft and remove actuator ball. Do not remove actuator ball retaining spring (18) unless renewal is required. Remove plug (32) and recirculating ball (30) from valve body. Thoroughly clean all parts in a suitable solvent, visually inspect parts and renew any showing excessive wear, scoring or other damage. If needle bearing (8) must be renewed, press same out toward flanged end of cover. Press new bearing in from flanged end of cover to the dimension shown in Fig. 17. Press only on numbered end of bearing, using a rotor, commutator and vanes. Refer to Fig. 18 for correct measurement. Rotor, stator and vanes are available in a kit which includes all three items; however, vane springs (38-Fig. 16) are available separately. Renew the kit if any parts are damaged. Before reassembling, wash all parts in clean solvent and air dry. All parts, unless otherwise indicated, are installed dry. Install recirculation ball (30-Fig. 16) and plug (32) with new "0" ring (31) in valve body and tighten plug to a torque of 10-14 ft.-lbs. Clamp fitting (installed in valve port) in a vise so that top end of valve body is facing upward. Install thrust washer (14), thrust bearing (13), spring washer (12), thrust washer (11) and snap ring (10) on input shaft (15). If actuator ball retaining ring (18) was removed install BEARING PART NO. INSET A ON THIS SIDE ~~ INSTALL "'-... = BEARING .. IN THIS DIRECTION = T -1 1.2BO" - , 300" piloted mandrel. Fig. 17-Needle bearing properly installed as Examine machined surfaces of stator, shown for Model1175. Fig. 16-Exploded view of ROSS hydrostatic steering pump and control valve used on Model 1175. 1. Shield 2. Snap ring 3. Step washer 4. Seal 5. Seal 6. Cover (upper) 7. Seal ring 8. Needle bearing 9. Shim 10. Snap ring 11. Thrust washer 12. Spring washer 13. Thrust bearing 14. Thrust washer 15. Input shaft 16. Pin 17. Actuator ball 18. Retaining spring 19. Drive ring 20. Spacer 21. Torsion bar 22. Pin 26. Spacer 29. Valve body 30. Recirculating ball 31. "0" ring 32. Plug 33. Valve spool 34. Spacer plate 35. Drive link 36. Stator 37. Vane (6 used) 38. Spring (6 used) 39. Rotor 40. Manifold 41. Commutator ring 44. Seal retainer 42. Commutator 45. Washer 43. Seal 46. End cover Paragraph 14 Cont. new retaining ring. Place actuator ball ( 17) in its seat inside valve spool (33). Insert input shaft into valve spool, engaging the helix and actuator ball with a counterclockwise motion. Use the mid-section of torsion bar (21) as a gage between end of valve spool and thrust washer, then place the assembly in a vertical position with end of input shaft resting on a bench. Insert drive ring ( 19) into valve spool until drive ring is engaged on input shaft spline. Remove torsion bar gage. Install spacer (20) on torsion bar and insert the assembly into valve spool. Align cross- B Fig. 18-Examine rotor, stator and va.1es for scoring, nicks and burrs. A. Replace when thickness difference exceeds 0.0015. B. Rotor to stator clearance should not exceed 0.006 when measured as shown. C. Thickness of stator and rotor must be equal within 0.002. D. Spring arch should be 0.080-0.100 when measured as shown. E. Vane thickness must equal rotor thickness within 0.002 and vane height must not be less than 0.250. 9

Paragraph 15 holes in torsion and input shaft and install pin (16). Pin must be pressed into shaft until end of pin is about l/32- inch below flush. Place spacer (26) over spool and install spool assembly into valve body. Position original shims (9) on thrust washer (11), lubricate new seal ring (7), place seal ring in upper cover (6) and install upper cover assembly. Align the match marks on cover flange and valve body and install cap screws finger tight. Tighten a worm drive type hose clamp around cover flange and valve body to align the outer edges, then tighten cap screws to a torque of 18-22 ft.-lbs. NOTE: If either input shaft (15) or upper cover (6) or both have been renewed, the following procedure for shimming must be used. With upper cover installed (with original shims) as outlined above, invert unit in vise so that input shaft is pointing downward. Grasp input shaft, pull downward and prevent it from rotating: Engage drive link (35) splines in valve spool and rotate drive link until end of spool is flush with end of valve body. Remove drive link and check alignment of drive link slot to torsion bar pin. Install drive link until its slot engages torsion bar pin. Check relationship of spool end to body end. If end of spool is within 0.0025 of being flush with end of body, no additional shimming is required. If not within 0.0025 of being flush, remove cover and Fig. 19-Exploded view of rigid steering column. Latch (25-28 in Fig. 20) is substi- tuted tor bolt (3) in adjustable unit. Installation of pivot studs is shown at (A) and column boot at (B). 1. Spring pin 8. Column 2. Shaft 9. Bushing 3. Lock bolt 10. Dust seal 4. Jam nuts 11. Steering wheel 5. Pivot stud 12. Nut 6. Snubber 13. Retaining ring 7. Bushing 14. Medallion 10 add or remove shims (9) as necessary. Reinstall cover and recheck spool to valve body position. With drive link installed, place spacer plate on valve body with plain side up. Install stator, rotor, vanes and springs over drive link splines and align cap screw holes. Make certain vanes and vane springs are properly installed. Install manifold (40) with circu- lar slotted side up and align cap screw holes with stator, spacer and valve body. Install commutator ring (41) with slotted side up, then install commutator (42) over drive link end making certain that link end is engaged in the smallest elongated hole in commutator. Install seal (43) and retainer (44). Apply a few drops of hydraulic fluid on commutator. Use a small amount of grease to stick wear washer (45) in position over pin on end cover (46). Install end cover making sure that pin engages center hole in commutator. Align holes and install cap screws. Alternately and progressively tighten cap screws while rotating input shaft. Final tightening should be 18-22 ft.-lbs. torque. Relocate the unit in vise so input shaft is up. Lubricate new seal (5) and carefully work seal over shaft and into bore with lip toward inside. Install washer (4) and stepped washer (3) with flat side up. Install snap ring (2) with rounded edge inward. Place shield (1) over input shaft. Remove unit from vise and remove fitting from port. Turn unit on its side 15~ ~d---1 Fig. 20-Exploded view of optional parts used on models (except 1175} with adjustable steering column. Refer to Fig. 19 for remainder of assembly and tor parts identification except for the following: 15. Inner shaft 22. Shaft nut 16. Lock pin 23. Release knob 17. Outer shaft 24. Nut 18. Jam nut 25. Spring 19. Wedges 26. Plunger 20. Retaining ring 27. Support 21. Lock shaft 28. Tilt lever J.l. CASE with hose ports upward. Pour clean hydraulic fluid into inlet port , rotate input shaft until fluid appears at outlet port, then plug all ports. All Models Except 1175 15. STEERING COLUMN. Fig. 19 shows rigid steering column and associated parts; optional adjustable parts are shown in Fig. 20. To remove the steering column after manual pump is removed, proceed as follows: On adjustable models only, remove steering wheel using a suitable puller. On all models, loosen jam nuts (4-Fig. 19) and back out the two pivot studs (5) until clear of housing. On rigid unit, remove cap screw (3). On all models withdraw housing and steering shaft assembly as a unit from bottom of steering support. Some early units were not equipped with dust seal (10). On these units, bushing (9) should be installed flush with upper end of column bore. If seal is installed, bushing must be recessed to bottom of seal counterbore. To renew worn pivot bushings (7), withdraw snubbers (6) and collapse old bushing with a suitable chisel. All bushings are pre-sized. When installing steering column, tighten pivot studs (5) to a torque of 25-30 in.-lbs. and outer jam nuts (4) to 30-35 ft.-lbs. Tighten locking cap screw (3) to 85-95 ft.-lbs. on rigid models. Fig. 21-Exploded view of rigid steering column used on Model 1175. 6. Shaft 15. Joint 20. Snubber 16. Wiper seal 21. Stud 17. Bearing 22. Jam nuts 18. Column 28. Lock link 19. Bushings 29. Bolt

J.I. Case 770, 870, 970, 1070, 1090, 1170, 1175 Tractor Service & Repair Manual

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