920 & 930 WHEEL LOADER VEHICLE SYSTEMS Caterpillar


Steering Control Valve

Usage:

Remove And Install Steering Control Valve

1. Turn the machine all of the way to the left.

------ WARNING! ------

Stop the engine, lower the bucket to the ground, move the control levers backward and forward to release the pressure in the hydraulic system. Slowly loosen the cap to release any pressure in the hydraulic tank. Let the hydraulic oil become cool before any lines are disconnected in the hydraulic system. Put blocks in front and behind the wheels.

--------WARNING!------

2. Drain the oil from the hydraulic tank. The capacity of the system is:

920-17.5 U.S. gal. (66 litre)
930-19.5 U.S. gal. (74 litre)

3. Disconnect hose assemblies (1) and (3) from tube assemblies (2) and (4).

4. Remove tube assemblies (2) and (4) from the machine.

5. Disconnect tube assembly (5) from tube assembly (6). Disconnect tube assemblies (6) and (7) from the control valve.

6. Disconnect the hose assembly and two tube assemblies from the back of the control valve.

7. Remove the three bolts that hold the control valve to the frame and remove the valve. The weight of the valve is 55 lb. (25 kg).

8. Put the control valve in position and install the bolts to hold it.

9. Put clean hydraulic oil on the O-ring seals for the tube assemblies.

10. Connect tube assemblies (6) and (7) to the control valve. Connect tube assembly (5) to tube assembly (6).

11. Connect the two tube assemblies and hose assembly to the back of the control valve.

12. Install tube assemblies (2) and (4) on the machine and connect them to the control valve.

13. Connect hose assemblies (1) and (3) to tube assemblies (2) and (4).

14. Fill the hydraulic system with oil to the correct level.

Disassemble Steering Control Valve

start by:

a) remove steering control valve

1. Remove the right turn neutralizer valve (1) and the O-ring seals from the main valve body.

------ WARNING! ------

Spring (4) is under tension and can push seat (6) out of the valve body with force. Use care when valve (1) is removed so seat (6) does not come out of the valve body and cause bodily injury.

--------WARNING!------

2. Remove seat (6), valve (5), spring (4), shims (3) and plug (2) from the valve body. Remove the O-ring seals from plug (2), seat (6) and the valve body.

3. Remove plug assembly (10), the O-ring seal, spring and ball from the neutralizer valve body.

4. Remove plug (9) and the O-ring seal.

5. Remove boot (8) from the valve stem. Remove plug (7), the O-ring seal and spring. Remove the bolt, lockwasher and washer that hold the valve stem. Remove the valve stem from the neutralizer valve body.

6. Remove seal (11), the five plugs (12) and O-ring seals from the neutralizer valve body.

7. Remove spring (15) and valve (13) from the main valve body. Remove spring (15) and the shims from valve (13).

8. Remove valve stem assembly (16) and pin (14) from the main valve body.

9. To disassemble valve stem assembly (16), remove the bolt, lockwasher, washer, retainer (19), spring (18), spacer (17), the retainer and shims from valve stem (20).

10. Remove left turn neutralizer valve (21) and the O-ring seals from the main valve body.

11. Remove spacer (22) from the main valve body.

12. Remove plug assembly (25), the O-ring seal, spring and ball from the neutralizer valve body.

13. Remove boot (23) from the valve stem. Remove plug (24), the O-ring seal and spring. Remove the bolt, lockwasher and washer that hold the valve stem. Remove the valve stem from the neutralizer valve body.

14. Remove the lip type seal for the valve stem from the neutralizer valve body.

15. Remove plug assembly (27), the O-ring seal, spring and ball from the neutralizer valve body.

16. Remove plugs (26) and (28), fitting (29) and the O-ring seals from the neutralizer valve body.

17. Remove selector valve (30) and the O-ring seals from the main valve body.

18. Remove plug (33), the O-ring seal, spring and valve stem. Remove the plug and O-ring seal from the other end of the selector valve body.

19. Remove fittings (31), plugs (32) and the O-ring seals from the selector valve body.

20. Remove five plugs (34) and the O-ring seals from the main valve body.

21. Remove plug (35), the O-ring seal, seat, ball and seat. Remove the O-ring seals from the seats.

Assemble Steering Control Valve


NOTICE

All parts must be kept clean. Use paper free of lint and clean solvent to clean the parts. Put clean hydraulic oil on all of the parts before they are assembled.


1. Install the five plugs (2) and O-ring seals in the main valve body.

2. Install the O-ring seal on the seat for ball (1) and install it in the main valve body. Put the O-ring seal on seat (3). Install ball (1), seat (3), the O-ring seal and plug (4) in the main valve body.

3. Install the five plugs (10), plug (5), fittings (6) and the O-ring seals in the selector valve body.

4. Install valve stem (7), spring (8), the O-ring seal and plug (9) in the selector valve body as shown.

5. Install the O-ring seals in selector valve (11) and put it in position on the main valve body. Tighten the bolts that hold the selector valve.

6. Install the O-ring seal and plug (12) in the left turn neutralizer valve body. Tighten the plug to a torque of 42 ± 4 lb.ft. (58 ± 5 N·m).

7. Use tool group (A) and install the seal in the left turn neutralizer valve body. Make sure the lip of the seal is toward the inside as shown.

8. Install fitting (13), the five plugs (20) and the O-ring seals in the neutralizer valve body.

9. Install the ball, spring, the O-ring seal and plug assembly (19). Tighten the plug assembly to a torque of 19 ± 2 lb.ft. (25 ± 3 N·m).

10. Install valve stem (14), washer (22), lockwasher (21) and bolt (16). Tighten bolt (16) in the end of valve stem (14) to a torque of 10 ± 2 lb.ft. (14 ± 3 N·m).

11. Install spring (17), the O-ring seal and plug (18). Tighten the plug to a torque of 75 ± 6 lb.ft. (100 ± 8 N·m).

12. Install boot (15) for the valve stem on the neutralizer valve body.

13. Install the O-ring seal and plug (26). Install ball (25), spring (24) and plug assembly (23). Tighten the plug assembly to a torque of 25 ± 3 lb.ft. (35 ± 4 N·m).

14. Install spacer (27) in the main valve body. Install the O-ring seals in the left turn neutralizer valve (28). Put neutralizer valve (28) in position on the main valve body and install the bolts to hold it.

15. Install shims (36), retainer (35), spacer (34), spring (33), retainer (32), washer (31), lockwasher (30) and bolt (29) on valve stem (37). Tighten bolt (29) to a torque of 15 ± 2 lb.ft. (20 ± 3 N·m).

16. Install pin (38), valve spool (39), shims (40), spring (41) and valve stem assembly (42) in the main valve body.

17. Use tool group (A) and install the lip type seal for the valve stem in the right turn neutralizer valve body. Make sure the lip of the seal is toward the inside as shown.

18. Install valve stem (44), washer (48), lockwasher (49) and bolt (45). Tighten bolt (45) in the end of valve stem (44) to a torque of 10 ± 2 lb.ft. (14 ± 3 N·m).

19. Install spring (46), the O-ring seal and plug (47). Install boot (43) for valve stem (44) on the neutralizer valve body.

20. Install the five plugs (52) and the O-ring seals in the neutralizer valve body. Tighten the plugs to a torque of 3 + 2 or - 1 lb.ft. (4 + 3 or - 1 N·m).

21. Install the O-ring seals on seat (55) and plug (50). Install spring (53), valve (54), seat (55), shims (51) and plug (50) in the neutralizer valve body as shown.

22. Install the O-ring seals in the right turn neutralizer valve (56). Put neutralizer valve (56) in position on the main valve body and tighten the bolts to hold it.

23. See Hydraulic Steering System in TESTING AND ADJUSTINNG for shim adjustment.

end by:

a) install steering control valve

Caterpillar Information System:

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920 & 930 WHEEL LOADER VEHICLE SYSTEMS Steering Column
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Steering Wheel
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920 & 930 WHEEL LOADER VEHICLE SYSTEMS Wheel Brake Linings
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920 & 930 WHEEL LOADER VEHICLE SYSTEMS Brake Master Cylinder Actuators
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Steering Cylinders
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Bucket
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Bucket Positioner
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Bucket Positioner Master Cylinder
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Lift Kickout Master Cylinder
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Bucket Positioner Or Lift Kickout Master Cylinder
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Bucket Positioner And Lift Kickout Slave Cylinders
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Bucket Positioner Or Lift Kickout Slave Cylinder
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Lift Cylinders
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Tilt Cylinders
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Lift Arms
920 & 930 WHEEL LOADER VEHICLE SYSTEMS Hydraulic Control Valve
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