Steering Control Unit Repair (Models 30580 And 30581); Steering Control Unit Repair (Model 30582 And 30583); Steering System Repairs - Toro Groundsmaster 580-D Service Manual

Steering Control Unit Repair
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
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
Disassembly (Fig. 49A)
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.
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.
Groundsmaster 580--D
(Models 30580 and 30581)
(Model 30582 and 30583)
8
1
3
24
23
22
150 in- -lb 21
(17 N- -m)
17
18
9. Cap screw
10. End cap
11. O- -ring
12. Seal ring
13. O- -ring
14. Geroter
15. O- -ring
16. Spacer
5
19
20
19
12
13
14
15
16
Figure 49A
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
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.
Page 4 - - 54.1 Rev. G
6
7
4
9
10
11
140 to 160 in- -lb
(16 to 18 N- -m)
17. Geroter drive
18. Wear plate
19. Bearing race
20. Thrust bearing
21. Plug
22. O- -ring
23. Relief valve
24. Quad seal

Steering System Repairs