5-9
DS35-W00 May. 2007
CLUTCHCLUTCH
CLUTCHCLUTCH
CLUTCH
TRANSMISSIONTRANSMISSION
TRANSMISSIONTRANSMISSION
TRANSMISSION
ENGINEENGINE
ENGINEENGINE
ENGINE
HSTHST
HSTHST
HST
FRONT AXLEFRONT AXLE
FRONT AXLEFRONT AXLE
FRONT AXLE
STEERINGSTEERING
STEERINGSTEERING
STEERING
BARKEBARKE
BARKEBARKE
BARKE
ELECTRICELECTRIC
ELECTRICELECTRIC
ELECTRIC
INDEXINDEX
INDEXINDEX
INDEX
HYDRAULICHYDRAULIC
HYDRAULICHYDRAULIC
HYDRAULIC
GENERALGENERAL
GENERALGENERAL
GENERAL
REAR AXLEREAR AXLE
REAR AXLEREAR AXLE
REAR AXLE
CK22/CK22H
2.3.5 NEUTRAL VALVE
Neutral valve is a valve that secures neutral position
during starting.
When the swash plate’s angle and discharge volume
become smaller, the motor does not rotate because
the oil flows into the inner passage of case (passage
B-drain circuit) via orifice.
(Maintaining neutral width)
As the swash plate’s angle increases, the oil volume
passing the orifice also increases causing high pres-
sure drops in fore and aft of the orifice.
According to pressure differences generated at this
moment, the oil pressure overrides spring force, then
the valve moves toward left by blocking contacts be-
tween passages A and B.
Accordingly, the discharged oil from the pump that was
flowing toward the drain circuit (passage B) flows into
motor causing its rotation.
196W4A3A
(1) Neutral valve ass’y (4) O-ring
(2) O-ring (5) Check
(3) Backup ring (6) Check valve spring
HST - OPERATING PRINCIPLE
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