Transmission Implement Relief Valve - Toro Groundsmaster 300 Series Service Manual

Transmission Implement Relief Valve (Fig. 18)
1. Place a drain pan below the implement relief valve.
2. Remove the implement relief plug and O-ring from the
side of the pump housing. Slide the shim pack, spring
and cone out of the pump housing. Some oil may flow
out of the transmission.
NOTE:Count the shims when they are removed. The
same number of shims must be installed when assem-
bling the parts. Do not interchange implement relief
shims with charge relief shims.
3. Remove the O-ring from the plug.
4. Inspect the plug and the pump housing for stripped
threads. Replace any part that is damaged. Also, check
the seat inside the pump housing for damage and
foreign material.
5. Inspect the relief valve cone for noticeable damage.
If cone is damaged, replace it.
6. Check the spring for damage and correct specifica-
tions. Replace the spring if its condition is doubtful.
Spring specifications are listed in the table below.
Implement Relief Spring Specifications
Free Length . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.804 in.
Number of Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Outside Diameter . . . . . . . . . . . . . . . . . 0.260 - 0.262 in.
Pounds per Inch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339
7. To install the implement relief valve, slide the new
O-ring onto the implement relief plug.
8. In sequence, install the cone, spring, and shim pack
into the pump housing. Install the plug to retain the parts
in place.
9. Since some oil drained out of the transmission when
the implement relief valve was removed, check the oil
level in the axle housing. Start the engine and let it run
for about one or two minutes.Then turn the engine off
and check the oil level in the axle housing again. Also,
inspect implement relief plug area for oil leaks.
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Groundsmaster 300 Series Page 5 - 29
Figure 18
Repairs