Toro 4100-D service manual Steering Valve Service, Disassembly Fig

Steering Valve Service

	8
1	3
	24
2						7	6
					5	4
			19	20	19
	23	22
	150 in-lb	21
	(17 N-m)
							9
						10
						11
					13	12
							140 to 160 in--lb
					14
				15			(16 to 18 N-m)
			16
	18	17

Figure 65

1.	Steering valve housing	9.	Cap screw (7 used)	17.	Geroter drive
2.	Dust seal	10.	End cap	18.	Wear plate
3.	O-ring	11.	O-ring	19.	Bearing race
4.	Spool	12.	Seal ring	20.	Thrust bearing
5.	Spring retaining ring	13.	O-ring	21.	Plug
6.	Pin	14.	Geroter	22.	O-ring
7.	Sleeve	15.	O-ring	23.	Relief valve
8.	Centering springs/spacers	16.	Spacer	24.	Quad seal

Disassembly (Fig. 65)

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 (7) cap screws from the steering 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 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.

Hydraulic System Page 4 -- 96 Groundsmaster 4100--D