Relief Valve - Toro GROUNDSMASTER 325-D Troubleshooting Manual

TORO GM 345 / 325-D
Acceleration valves
1. The drive oil from the hydrostatic pump also flows to the acceleration valves.
2. The oil is allowed to flow through the orifice in the valve, until sufficient pressure is created to close the
acceleration valve.
3. Bleeding away some of this initial oil flow allows for a smoother unit start and direction change.
4. The acceleration valves do not serve as the drive circuit relief valve.
5. The 2 wheel drive unit does not have a relief valve.

Relief Valve

The 4 wheel drive unit has an externally mounted relief valve.
The relief valve only regulates the oil pressure in the forward direction.
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Notes
Hydraulics
43