Kubota WSM ZD331 User Manual

4-M4
ZD321, ZD326, ZD331, WSM
HYDRAULIC SYSTEM
■Neutral
W1012655
The oil sent from the pump passes through a gap between the spool (3) and the valve body (5), through the
regulator valve, and then flows to the PTO valve and HST charge circuit. The oil sent to the mower-lifting cylinder is
interrupted by the spool (3).
■ Lift and Overloaded
W1012795
The oil flowing from the pump flows through a hydraulic circuit, which is switched over by the spool (3), and is sent
to the mower-lifting cylinder (2). When the mower is lifted, the relief valve (6) also operates. As a result, the oil passing
through the relief valve (6) is always sent to the PTO valve and HST charge circuit.
(Reference)
• Relief valve setting pressure : 5.5 to 7.0 MPa (56 to 71 kgf/cm
2
, 800 to 1000 psi)
• Engine speed : 1800 min
-1
(rpm) (ZD321, ZD326)
1600 min
-1
(rpm) (ZD331)
(1) To PTO Clutch and
Hydrostatic Transmission
(2) C (Cylinder) Port
(3) Spool
(4) P (Pump) Port
(5) Valve Body
(6) Relief Valve
(1) To PTO Clutch and
Hydrostatic Transmission
(2) C (Cylinder) Port
(3) Spool
(4) P (Pump) Port
(5) Valve Body
(6) Relief Valve
KiSC issued 04, 2007 A

Kubota WSM ZD331 Specifications

General

Transmission	Hydrostatic
Fuel Type	Diesel
Cylinders	3
Engine Type	Diesel
Cutting Width	72 inches
PTO	Independent
Type	Zero-Turn Mower
Displacement	68.5 cu in
Drive	2WD
Turning Radius	Zero