4-M1
ZD21N-EC, ZD21-EC, ZD28-EC, WSM
HYDRAULIC SYSTEM
1. HYDRAULIC CIRCUIT
The hydraulic system of this machine is composed of a hydraulic pump (10), control valve (6), hydraulic cylinder
(4) and other components.
This system has the following functions.
Oil is supplied by hydraulic pump (10) which is driven by engine.
Power from the input shaft (pump shaft) is distributed right and left with the bevel gears and drives each hydrostatic
transmission (12).
Moreover, oil from the hydraulic pump (10) is sent to the transmission center case through the control valve. On
the other hand, oil is regulated with the regulator valve (9) to constant pressure and sent to the hydrostatic
transmission (12) and PTO clutch (1).
(1) PTO Clutch
(2) PTO Clutch Valve
(3) Hydraulic Control Valve
Assembly
(4) Hydraulic Cylinder
(5) Relief Valve
(6) Control Valve
(7) Oil Cooler (ZD28)
(8) Oil Filter
(9) Regulator Valve
(10) Hydraulic Pump
(11) Oil Strainer
(12) Hydrostatic Transmission
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