2-M3
ZD21N-EC, ZD21-EC, ZD28-EC, 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.
(1) Swashplate
(2) Piston
(3) Cylinder
(4) Oil
(5) Cylinder
(6) Piston
(7) Swashplate (A) Pump
(B) Motor
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