caution - Toro
caution - Toro
caution - Toro
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CAUTION<br />
The centering springs are under tension. Remove<br />
the retaining ring carefully.<br />
10.Remove the spring retaining ring and centering<br />
springs from the spool.<br />
Reassembly (Fig. 65)<br />
Check all mating surfaces. Replace any parts with<br />
scratches or burrs that could cause leakage. Wash all<br />
metal parts in clean solvent. Blow them dry with pressurized<br />
air. Do not wipe parts dry with paper towels or cloth<br />
as lint in a hydraulic system will cause damage.<br />
NOTE: Always use new seals and O--rings when assembling<br />
the steering valve.<br />
IMPORTANT: During assembly, lubricate the new<br />
seals with petroleum jelly. Also, lubricate machined<br />
surfaces and bearings with clean hydraulic fluid.<br />
1. Install the quad seal (Fig. 66):<br />
A. Put one of the bearing races and sleeve into the<br />
housing.<br />
B. Together, the housing and bearing race create a<br />
groove into which the quad seal will be installed.<br />
C. Hold the bearing race tightly against the input end<br />
of the housing by pushing on the gerotor end of the<br />
sleeve.<br />
D. Fit the quad seal into its seat through the input end<br />
of the housing. Be sure the seal is not twisted.<br />
E. Remove the sleeve and bearing race.<br />
2. Lubricate and install the dust seal.<br />
3. Install the centering springs in the spool. It is best to<br />
install the two flat pieces first. Next, install the curved<br />
pieces, three at a time.<br />
8. Put the thrust bearing and races into the housing.<br />
The thrust bearing goes between the two races<br />
(Fig. 66).<br />
IMPORTANT: Do not damage the dust or quad seals<br />
when installing the spool and sleeve assembly.<br />
9. Apply a light coating of clean hydraulic fluid to the<br />
spool and sleeve assembly and carefully slide the assembly<br />
into the housing.<br />
10.Clamp the housing in a vise. Use only enough clamping<br />
force to hold the housing securely.<br />
11.Lubricate and install a new O-ring seal in the groove<br />
in the housing.<br />
12.Install the wear plate and align screw holes in the<br />
wear plate with threaded holes in the housing.<br />
NOTE: The holes in the wear plate are symmetrical.<br />
13.Install the geroter drive, making sure the slot in the<br />
drive engages the pin.<br />
14.Lubricate and install new O-ring in wear plate<br />
groove.<br />
15.Install the gerotor and align the screw holes.<br />
16.Lubricate and install new O-ring in gerotor ring<br />
groove.<br />
17.Lubricate and install new O-ring and seal ring in gerotor<br />
star groove.<br />
18.Install the spacer.<br />
19.Install the end cap and seven (7) cap screws. Tighten<br />
the cap screws, in a crossing pattern, from 140 to 160<br />
in-lb (16 to 18 N -m).<br />
20.Remove the steering valve from the vise.<br />
21.Install the relief valve and plug. Tighten the plug to<br />
150 in-lb (17 N -m).<br />
Hydraulic<br />
System<br />
4. Fit the retaining ring over the centering springs.<br />
5. Apply a light coating of clean hydraulic fluid to the<br />
spool and slide it into the sleeve. Be sure the centering<br />
springs fit into the notches in the sleeve.<br />
Dust Seal<br />
Thrust Bearing<br />
and Race (2)<br />
6. Install the pin.<br />
7. Apply a light coating of petroleum jelly to the inner<br />
edge of the dust and quad seals.<br />
Quad Seal<br />
Figure 66<br />
Groundsmaster 4100--D<br />
Page 4 - 97<br />
Hydraulic System