2-M4
ZD18(F) · ZD21(F) · ZD28(F), WSM
TRANSAXLE
(2) Pump and Motor
Pump and motor cylinder, each containing pistons, are connected by lines. Cylinders and lines are filled with oil.
Pistons ride against swashplates located in pump and motor.
In the pump, as the cylinder rotates, pistons move across the sloping face of swashplate and slide in or out of their
cylinder bores. The oil, forced out by the pump pistons, causes the motor pistons to slide out of their cylinder bores.
In the motor, sliding out of the cylinder and moving across the sloping face of swashplate, the pistons rotate the
cylinder.
(3) Check Valve
[Serial No. Affected: below 20000]
The check valves monitor the oil pressure in each line
of the main oil circuit.
In neutral, both check valves are open and charging
oil enters into the main oil circuit through the valves.
At normal operation, the check valve in the high
pressure side is closed and it pushes and opens the
another one.
W1012950
(1) Swashplate
(2) Piston
(3) Cylinder
(4) Oil
(5) Cylinder
(6) Piston
(7) Swashplate (A) Pump
(B) Motor
(1) Check Valve (Ball) (2) Check Spring
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