Service Manual

Steering Gear Service
31)
32)
33)
34)
35)
36)
37)
38)
39)
40)
41)
42)
43)
44)
45)
46)
47)
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
16)
17)
18)
19)
20)
21)
22)
23)
24)
25)
26)
27)
28)
29)
30)
11)
12)
13)
14)
15)
39
44)
when installing
pitman arm
Torque to
180 – 210 ft–lb
(244 – 285 Nm)
Figure 30
1. Retaining ring 17. Flange hex bolt 33. Valve body ring
2. Housing end plug 18. Spool valve 34. O–ring
3. Housing end plug seal 19. Spool valve o–ring 35. O–ring
4. Rack piston seal 20. Valve body 36. Stub shaft
5. Rack piston o–ring 21. Needle bearing 37. O–ring
6. Rack piston end plug 22. Stub shaft seal 38. Steering worm
7. Guide ball return 23. Stub shaft dust seal 39. Thrust bearing race
8. Ball return guide clamp 24. Retaining ring 40. Thrust roller bearing
9. Screw/lockwasher ass’y 25. Adjuster plug lock nut 41. Pitman arm nut
10. Chrome alloy ball 26. Adjuster plug 42. Lockwasher
11. Rack piston 27. O–ring 43. Retaining ring
12. Steering gear housing 28. Upper bearing race 44. Seal backup washer
13. Pitman shaft 29. Thrust roller bearing 45. Pitman shaft seal
14. Side Cover seal 30. Thrust bearing race 46. Pitman shaft seal
15. Housing side cover 31. Thrust bearing spacer
16. Lash adjuster nut 32. Bearing retainer
The power steering gear has a recirculating ball system
which acts as a rolling thread between the worm shaft
and the rack piston. The worm shaft is supported by a
thrust bearing preload and two conical thrust races at
the lower end, and a bearing assembly in the adjuster
plug at the upper end.
The control valve in the steering gear directs the power
steering fluid to either side of the rack piston. The rack
piston converts the hydraulic pressure into a mechani-
cal
force. If the steering system loses hydraulic pres-
sure, the vehicle can be controlled manually.
Turning the worm shaft moves the rack piston up or
down. The rack piston teeth mesh with the pitman shaft
sector
. Turning the worm shaft turns the pitman shaft,
which turns the wheels through the steering linkage.
Steering, Brakes and Suspension Page 7
– 26 Workman 3000 Series