Steering Control Valve Service - Toro Greensmaster 3150 Service Manual

Steering Control Valve Service

2
1. Steering valve housing
2. Dust seal
3. O–ring
4. Spool
5. Spring retaining ring
6. Pin
7. Sleeve
8. Centering springs/spacers
9. Cap screw
Disassembly
NOTE: Cleanliness is extremely important when
repairing hydraulic components. Work in a clean area.
Before disassembly, drain the oil, then plug the ports
and thoroughly clean the exterior. During repairs,
always protect machined surfaces.
1. Remove the seven cap screws from the steering
valve assembly.
2. Remove end cap, geroter, spacer, geroter drive,
wear plate, seal ring, and o–rings from housing (Fig. 45).
3. Remove the plug and relief valve.
Hydraulic System
8
3
1
24
23
22
150 in–lb
(17 Nm)
17
18
10. End cap
11. O–ring
12. Seal ring
13. O–ring
14. Geroter
15. O–ring
16. Spacer
17. Geroter drive
5
4
19
19
20 25
21
13
14
15
16
Figure 45
4. Slide the spool and sleeve assembly from the hous-
ing.
5. Remove the thrust bearing and bearing races (2).
6. Remove the quad seal.
7. Use a small blade screwdriver to carefully pry the
dust seal from the housing. Be careful to not damage the
dust seal seat in the housing.
8. Remove the pin that holds the spool and sleeve to-
gether.
9. Carefully slide the spool out of the sleeve. The cen-
tering springs and spring retaining ring will stay with the
spool as it is removed.
Page 4 – 78 Rev. C
6
7
140 to 160 in–lb
(16 to 18 Nm)
10
11
12
18. Wear plate
19. Bearing race
20. Thrust bearing
21. Plug
22. O–ring
23. Relief valve (R5)
24. Quad seal
25. Ring
Greensmaster 3150
9