Transmission By-Pass Valve - Toro Groundsmaster 300 Series Service Manual

Transmission By-Pass Valve (Fig. 16)
1. Place a drain pan below the by-pass valve.
2. Remove the by-pass valve assembly from the center
section by turning it counterclockwise. Some oil may
flow into the drain pan.
3. Inspect the threads on the by-pass valve. Replace the
valve if the threads are damaged.
4. Check the O-ring and back-up ring for damage.
If the parts are damaged, replace them.
5. If the O-ring or back up ring was removed
because of damage, slide the new back up ring into the
groove at the center of the valve, then install the O-ring
Figure 16
into the same groove.

1. Transmission by-pass valve

6. To install the by-pass valve, screw it into the center
section. Tighten the valve to 5 - 8 ft-lb.
7. Since some oil drained out of the transmission when
the by-pass 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 the
by-pass valve area for oil leaks.
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Groundsmaster 300 Series Page 5 - 27 (Rev. H) Repairs