Steering Control Valve Service
8
1
3
24
2
6
7
4
5
19
20
19
23
22
1
50 in--lb
21
(17
N--m)
9
10
11
12
13
140
(16
to 160 in--lb
to 18 N--m)
14
15
16
17
18
Figure 85
1.
2.
3.
4.
5.
6.
7.
8.
Steering control valve housing
9.
Cap screw (7 used)
17. Geroter drive
18. Wear plate
Dust seal
10. End cap
11. O--ring
12. Seal ring
13. O--ring
14. Geroter
15. O--ring
16. Spacer
O--ring
Spool
Spring retaining ring
Pin
Sleeve
Centering springs/spacers
19. Bearing race
20. Thrust bearing
21. Plug
22. O--ring
23. Relief valve
24. Quad seal
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.
4. Slide the spool and sleeve assembly from the hous-
ing.
5.
6.
7.
Remove the thrust bearing and bearing races (2).
Remove the quad seal.
Disassembly (Fig. 85)
Use a small blade screwdriver to carefully pry the
dustsealfromthehousing.Becarefultonotdamagethe
dust seal seat in the housing.
1.
control valve assembly.
Remove the seven (7) cap screws from the steering
8.
gether.
Remove the pin that holds the spool and sleeve to-
2.
wear plate, seal ring and O--rings from housing.
Remove end cap, geroter, spacer, geroter drive,
9.
tering springs and spring retaining ring will stay with the
spool as it is removed.
Carefully slide the spool out of the sleeve. The cen-
3.
Remove the plug and relief valve.
Hydraulic System
Page 4 -- 112
Groundsmaster 4000--D/4010--D
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