Toro GROUNDSMASTER 345 - Manual (Page 43)

TORO GM 345 / 325-D Hydraulics
Notes
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41
Drive Circuit
The drive circuit consists of a variable displacement pump and the hydrostatic motor.
Drive circuit operation.
1. When the traction pedal is depressed the swash plate in the pump rotates and the pump begins to pump.
2. The oil from the pump flows to the hydrostatic motor.
3. The oil flows through the hydrostatic motor and returns to the pump. (The oil flows in a closed loop).
There is a bypass valve located in the drive circuit. When the unit is pushed with the engine off, this valve allows
the oil being forced out of the hydrostatic motor to be directed back to the motor, instead of being forced through
the pump.
Note: Use the bypass valve to move the unit a short distance only, excessive travel can damage the
internal components of the hydrostatic transmission.