GZD15, WSM TRANSAXLE
2-M6
(5) Power Trains Operation
(1) Check and Relief Valve (1)-3 Neutral Orifice (4) Pump (7) Paper Filter
(with Neutral Orifice) (2) Motor (5) Hydraulic Pump (8) Regulator Valve
(1)-1 Relief Valve (3) Lubricating Orifice (6) Control Valve (9) PTO Clutch
(1)-2 Check Valve
B NEUTRAL
With the motion control levers in the NEUTRAL position, the piston springs in the pump block in the pumps force
the swash plates to a position that is parallel to the pump body. With the swash plates parallel to the pump body,
the pistons do not reciprocate in the cylinder block, they merely rotate, and no oil is being drawn in or discharged
from the pump. The machine is in a zero displacement position and the machine remains stationary.
Oil returning from the HST housing and hydraulic pump is directed through the regulating valve before returning
to the transmission case.
B Forward
As the motion control levers are pushed forward, the swash plates in the pumps move from the neutral position
(parallel to the pump body) to a forward angle position. Piston springs inside the cylinder bores force the pistons
against the swash plates.
As the cylinder block rotates, the pistons follow the contour of the swash plate, moving outward, drawing oil into
their bores. As the cylinder block continues to rotate, the pistons are forced into their bores, discharging oil under
pressure.
High-pressure oil from the pumps is routed to the motors, driving the machine forward.
B Reverse
Reverse operation is accomplished by reversing the angle applied to the pump swash plates, reversing the flow
of high-pressure oil to the motors.
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