Toro 30449 - Steering Control Valve Service

Groundsmaster 4100--D/4110--DHydraulic System Page 4 -- 110
Steering Control Valve Service
1. Steering control 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 (7 used)
10. End cap
11. O--ring
12. Seal ring
13. O--ring
14. Geroter assembly
15. O--ring
16. Spacer
17. Geroter drive
18. Wear plate
19. Bearing race
20. Thrust bearing
21. Plug
22. O--ring
23. Relief valve
24. Quad seal
Figure 75
3
5
6
9
10
16
11
12
13
14
15
4
7
1
2
17
18
19
19
20
21
22
23
24
8
140 to 160 in--lb
(16to18N--m)
150 in--lb
(17 N--m)
Disassembly (Fig. 75)
NOTE: Cleanliness is extremely important when
repairing steering control units. Work in a clean area.
Before disconnecting the hydraulic lines, clean the port
area of the steering control valve assembly. Before dis-
assembly, drain the oil, then plug the ports and thor-
oughlycleantheexterior.Duringrepairs,alwaysprotect
machined surfaces.
1. Remove the seven (7) cap screws from the steering
control valve assembly.
2. Remove end cap, geroter, spacer, geroter drive,
wear plate, seal ring and O--rings from housing.
3. Remove the plug and relief valve.
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
dustsealfromthehousing.Becarefultonotdamagethe
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 retainingring will stay with the
spool as it is removed.