Daedong CK22 - Joystick Valve

10-27
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
Symptom
External leakage
control kit or opposite
side.
Excessive internal
leakage on A and B
ports.
Dropping load during
transition while raising.
Inability to build
pressure on A and B
ports.
3.2 JOYSTICK VALVE
Provable Causes
• Worn spool seal due to mechanical actuation or
high back pressure.
• Increase clearance between spools and body due
to high wear
• High leakage of the load check valve.
• Main pressure relief valve blocked open.
• Low pump pressure and flow.
Solution
Locate the leakage and
replace the seal.
Check back pressure level.
Replace the direction
control valve and check the
oil contamination level.
Remove the load check
valve and clean the seat.
Remove and clean or
replace the main relief valve.
Check the pump and circuit.
HYDRAULIC SYSTME - TROUBLESHOOTING