Steering Control Unit Repair (Models 30580 and 30581)
For service of the steering control unit on Models 30580
and 30581, see the Eaton Char--Lynn Steering Control
Units Repair Information at the end of this chapter.
Steering Control Unit Repair (Model 30582 and 30583)
8
1
3
24
2
6
7
4
5
20 19
19
23
22
1
50 in--lb
21
(17
N--m)
9
10
12 11
13
14
140
(16
to 160 in--lb
to 18 N--m)
15
16
17
18
Figure 49A
1.
2.
3.
4.
5.
6.
7.
8.
Steering valve housing
9.
Cap screw
17. Geroter drive
18. Wear plate
19. Bearing race
20. Thrust bearing
21. Plug
Dust seal
O--ring
Spool
10. End cap
11. O--ring
12. Seal ring
13. O--ring
14. Geroter
15. O--ring
16. Spacer
Spring retaining ring
Pin
Sleeve
Centering springs/spacers
22. O--ring
23. Relief valve
24. Quad seal
Disassembly (Fig. 49A)
3. Remove the plug and relief valve.
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 valve assembly. Before disassem-
bly, 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.
Use a small blade screwdriver to carefully pry the
dustsealfromthehousing.Becarefultonotdamagethe
dust seal seat in the housing.
1.
valve assembly.
Remove the seven 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,
Groundsmaster 580--D
Page 4 -- 54.1 Rev. G
Steering System Repairs
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