Hydraulic Circuit - Kubota ZD221-48 Workshop Manual

ZD221 , WSM
HYDRAULIC SYSTEM
1. HYDRAULIC CIRCUIT
(1) (2)
(4)
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(5) (3)
(10)
(8)
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(11 ) (12)
3GZAAAD8P001 A
(1) PTO Clutch (4) Relief Valve (7) Regulator Valve (10) Hydraulic Pump
(2) PTO Clutch Valve (5) Control Valve (8) Mower Link (11) Oil Strainer
(3) Mower Lift Cylinder (6) Oil Filter
(9) Mower Deck (12) Hydrostatic Transmission
The hydraulic system of this machine is composed of a hydraulic pump (10), control valve assembly (5), mower lift
cylinder (3) 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 centre case through the control valve. On
the other hand, oil is regulated with the regulator valve (7) to constant pressure and sent to the hydrostatic
transmission (12) and PTa clutch (1)_
4-M1