Toro GROUNDSMASTER 345 - Manual (Page 45)

TORO GM 345 / 325-D Hydraulics
Notes
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43
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.