Usage:
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At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. Remove the fill plug only when the engine is stopped, and when the fill plug is cool enough to touch with your bare hand. |
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1. Remove cap (1) and cover (2).
2. Remove nut (3).
3. Install tooling (A) and remove the steering wheel.
4. Remove hydraulic lines (5) and bolts (4). Remove the steering valve.
NOTE: To install the steering valve, reverse the removal steps.
Disassemble And Assemble Steering Valve
Start By:
a. remove steering valve
1. Be sure the outside of the steering valve is thoroughly clean and free of dirt and debris prior to disassembly. Make alignment marks on the valve body to aid in proper assembly.
NOTE: When seven cap screws (1) are removed, the components of the gerotor assembly can be separated.
2. Remove seven cap screws (1) and gerotor assembly (2).
NOTE: Gerotor housing (5) and gerotor (8) are not serviced separately.
3. Remove end cap (3) and O-ring seal (4). Check the condition of the O-ring seal. If the seal is worn or damaged, use new parts for replacement.
4. Remove spacer plate (10), drive (9), gerotor (8) and spacer (7) from gerotor housing (5).
5. Remove O-ring seal (6) from the gerotor housing. Check the condition of the seal. If the seal is worn or damaged, use new parts for replacement.
6. Remove two bolts (11), and separate the steering column from the center housing assembly.
7. Remove O-ring seal (12) from the center housing. Check the condition of the seal. If the seal is worn or damaged, use new parts for replacement.
8. Remove retaining ring (14) and gland bushing (13) from the gerotor housing. If the seal is worn or damaged, use new parts for replacement.
9. Disassemble gland bushing (13). Remove dust seal (17) from seal gland bushing (15). Turn the seal gland bushing over, and remove quad ring seal (16) from the seal gland bushing.
10. Remove spool and sleeve assembly (18) from the center housing. Remove two bearing races (19) and needle thrust bearing (20) from the spool and sleeve assembly.
11. Remove pin (21) from the spool and sleeve assembly.
12. Separate control housing sleeve (23) and control spool (22).
NOTE: Centering spring kit (24) consists of six centering springs.
13. Remove centering spring kit (24) from the control spool.
14. Remove set screw (25) from the center housing.
15. Install an 1/8"-24 machine screw into the end of check ball seat (26). Remove check ball seat with a plier.
| NOTICE |
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O-ring seals (29) and (30) are different sizes. Note their location on the check ball seat prior to removal. When the O-ring seals are reinstalled, they must not be mixed. |
16. Remove check ball (28) and check ball retainer (27) from the center housing. Remove O-ring seals (29) and (30) from the check ball seat. Check the condition of the O-ring seals. If the seals are worn or damaged, use new parts for replacement.
NOTE: The following steps are for the assembly of the steering valve.
| NOTICE |
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Be sure all parts of the steering valve are clean and free of dirt and debris. Do not use a cloth or paper towel to dry parts. Lint or other material can get into the hydraulic system and cause damage to components. Replace any parts that have scratches or burrs that could result in leakage. |
17. Install check ball retainer (27) in the center housing. Be sure the retainer is straight and not tilted in the bore. Install check ball (28).
18. Put a thin coat of 1U6396 Assembly Compound on O-ring seals (29) and (30) and check ball seat (26). Install the O-ring seals in their original location on the check ball seat. Install the check ball seat in the center housing, using an 1/8"-24 machine screw.
19. Install set screw (25), and tighten it to a torque of 11 N·m (100 lb in). After installation, the set screw should be slightly below the outside surface of the center housing.
20. Put a thin coat of clean hydraulic oil control spool (22) and control housing sleeve (23). Install the control spool in the control housing sleeve. The spool should turn freely in the sleeve. Put the spring slots in each component in alignment. Some spool and sleeve sets may have alignment marks on them. In this case, align the marks. Install centering spring kit (24). Be sure the springs are centered. Install pin (21) that holds the spool and sleeve together. The pin should be flush on each side of the sleeve after installation.
| NOTICE |
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When spool and sleeve assembly (18) is installed in the center housing, be sure it is not tilted out of position. The assembly should be pushed gently into place with a slight rotating action, keeping pin (21) nearly horizontal. The spool and sleeve assembly should be installed until it is flush with the meter end of the housing (side with fourteen holes in the end). Be sure pin (21) does not drop into the discharge groove in the center housing. Be sure the spool and sleeve assembly turns freely in the center housing. |
21. Put the center housing in a vertical position. Install two bearing races (19) and needle thrust bearing (20).
22. Assemble gland bushing (13). Install dust seal (17) in seal gland bushing (15) with the flat or smooth side of the seal facing the bushing. Turn the seal gland bushing over. Install quad ring seal (16) in the seal gland bushing. Smooth the seal in place with your finger. Do not reuse a seal that falls freely into the pocket in the bushing.
23. Install gland bushing (13) over the spool with a twisting motion. Use a soft faced hammer to seat the gland bushing against bearing race (19). Install retaining ring (14). Be sure the retaining ring is properly seated.
24. Install the steering column on the center housing. Install two bolts (11) that hold it.
25. Put the steering valve in a vertical position with the steering column facing down. Install O-ring seal (12) in the center housing.
26. Install spacer plate (10). Be sure the bolt holes in the spacer plate align with the tapped holes in the center housing. Put pin (21) in a horizontal position in the center housing. Install drive (9). Be sure the slot in drive (9) engages with pin (21).
| NOTICE |
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The steering valve must be timed, this requires the correct relationship between pin (21), gerotor (8) and housing (5). One end of pin (21) will point to the largest clearance between the gerotor and gerotor housing, the other end of the pin points to the least clearance. Pin (21) cannot be seen after drive (9) is installed, so it will be necessary to make a mark on the gear end of the drive for proper alignment. |
27. Install O-ring seal (6) in gerotor housing (5). Install gerotor (8) in gerotor housing (5). Put the gerotor in position on the spacer plate. Align the star valleys. There should be a parallel relationship of the components. Align all the cap screw holes without disengaging the gerotor from the drive.
28. Install spacer (7) in the gerotor housing.
29. Install O-ring seal (4) in end cap (3). Install the end cap in its original position on the gerotor housing. Be sure the cap screw holes in the end cap are in alignment.
30. Install seven cap screws (1). Tighten the cap screws to a torque of 16 N·m (150 lb in). Retighten the cap screw in the number sequence shown to a torque of 32 N·m (275 lb in).
End By:
a. install steering valve