Daedong CK22 - Charge Pump; Check Valve and High-Pressure Relief Valve

5-8
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
2.3.3 CHARGE PUMP
Some internal leaks exist in pump and motor even
though they are connected each other with closed
circuit. The trochoid pump is installed as a charge pump
to compensate the leaks. The oil filter is installed at
outlet side of the pump.
The displaced oil from charge pump flows into main
circuit through the check valve of low-pressure circuit
to compensate the leaks. The pressure of supplied oil
from charge pump to low-pressure circuit is limited by
charge relief valve. The excessive oil returns to oil tank
through charge relief valve, pump and motor case (HST
case).
196W4A2A
(1) Relief valve spring (3) Plug
(2) Relief valve ass’y (4) O-ring
(A) High-pressure line
(B) Low-pressure line
2.3.4 CHECK VALVE AND HIGH-PRES-
SURE RELIEF VALVE
When overloaded to output shaft, to avoid the damage
to machine, this valve operates to return the high-pres-
sure oil to tank.
The check valve is installed against high-pressure re-
lief valve.
196W4B9B
HST - OPERATING PRINCIPLE