Disassembly
Steering Rack DisassemblyNOTE:
- Before disassembling the gearbox, wash it off with solvent and a brush.
- Do not dip seals and O-rings in solvent.
1. Remove the steering gearbox.
2. Remove the air tube and clips.
3. Remove the tie-rod end and locknut.
4. Remove the boot bands and tie rod clips. Pull the boots away from the ends of the gearbox.
5. Unbend the lock washer.
6. Hold the steering rack with a wrench, and unscrew the rack end with a wrench.
CAUTION: Be careful not to damage the rack surface with the wrench.
7. Loosen the locknut and remove the rack guide screw.
8. Remove the spring and rack guide from the gearbox housing.
9. Remove the cylinder lines A and B from the gearbox.
10. Drain the fluid from the cylinder fittings by slowly moving the steering rack back and forth.
11. Remove the two flange bolts, then remove the valve body unit from the gearbox. )
12. Drill a 3 mm (0.12 inch) diameter hole approximately 2.5 - 3.0 mm (0.10 - 0.12 inch) in depth in the staked-point on the cylinder.
NOTE:
- Do not allow metal shavings to enter the gearbox housing.
- After removing the cylinder end, remove any burrs at the stake point.
13. Install a puller yoke to the gearbox housing. Clamp the puller yoke in a vise with son jaws as shown, then loosen and remove the cylinder end.
CAUTION: Do not clamp the cylinder.
14. Remove the gearbox housing from the vise, and set it the in a press so the gearbox points upward.
15. Assemble a 12 x 1.25 mm flange nut onto a 12 x 170 mm grade 10 flange bolt as shown.
NOTE: Wrap the flange portion of the bolt with vinyl tape to protect the cylinder.
16. Install the flange bolt into the end of the steering rack until it bottoms in the hole, then back the flange bolt out 1/4 turn. Hold the flange bolt and tighten the flange nut against the rack by hand.
17. Press the cylinder end seal and steering rack out of the gearbox housing.
NOTE: Hold the steering rack to keep it from when pressed clear.
CAUTION: Be careful not to damage to inner surface of the cylinder with the flange bolt.
18. Remove the 12 mm bolt and nut from the steering rack.
19. Remove the cylinder end seal from the steering rack.
20. Insert a 24" long, 3/8" drive extension and the special tool into the gearbox housing from the gearbox side.
CAUTION: Be careful not to damage the inside surface of the housing with the tools.
21. Set the gearbox housing in a press, then press out the cylinder end seal and backup ring from the gearbox.
CAUTION:
- Keep the tool straight to avoid damaging the cylinder wall. Check the tool angle, and correct it if necessary, when removing the cylinder end seal.
- Use a press to remove the cylinder end seal. Do not try to remove the seal by striking the tool. It will break the backup ring, and the cylinder end seal will remain in the gearbox.
22. Carefully pry the piston seal ring and O-ring off the piston of the rack.
CAUTION: Be careful not to damage the inside of seal ring groove and piston edges when removing the seal ring.
Valve Body Unit Disassembly
23. Before removing the valve housing, apply vinyl tape to splines of the pinion shaft.
24. Separate the valve housing from the pinion shaft/valve using a press.
25. Check the inner wall of the valve housing where the seal ring slides with your finger. If there is a step in the wall, the valve housing is worn. Replace the valve housing.
NOTE:
- There may be the sliding marks from the seal ring on the wall of the valve housing. Replace the valve housing only if the wall is stepped.
- When the valve housing is replaced, install new 32 mm shim(s) on the bearing surface of the housing to adjust the thickness.
26. Check for wear, burrs and other damage to the edges of the grooves in the sleeve.
NOTE: The pinion shaft and sleeve are a precision matched set. If either the pinion shaft or sleeve must be replaced, replace both parts as a set.
27. Remove the circlip and pinion shaft sleeve from the pinion shaft.
28. Using a cutter or an equivalent tool, cut and remove the four seal rings from the sleeve.
CAUTION: Be careful not to damage the edges of the sleeve grooves and outer surface when removing the seal rings.
29. Using a cutter or an equivalent tool, cut the valve seal ring and O-ring at the groove the pinion shaft. Remove the valve seal ring and O-ring.
CAUTION: Be careful not to damage the edges of the pinion shaft groove and outer surface when removing the valve seal ring and O-ring.
30. Remove the valve oil seal and backup ring from the pinion shaft.
NOTE:
- Inspect the ball bearing by rotating the outer race slowly. If there is any excessive play, replace the pinion shaft and sleeve as an assembly.
- The pinion shaft and sleeve are a precise fit; do not intermix old and new pinion shafts and sleeves.
31. Press the valve oil seal and roller bearing out of the valve housing using a hydraulic press and special tool shown below.