Komatsu PC210LC-6 - Excessive Hydraulic Drift (Boom, Arm, Bucket)

TROUBLESHOOTING
H-l 0, H-l 1
H-IO Work equipment (boom, arm, bucket) does not move (but travel
and swing are normal)
jr When boom, arm, and bucket are each operated independently.
Is output pressure
of PPC’ valve
normal?
l Min. 2.14 MPa
(Min. 28 kg/cm21
l Engine at high
idling
YES
Defective control valve spool
NO
Defective PPC ‘valve
H-II Excessive hydraulic drift (boom, arm, bucket)
YES
1 1
Does speed of
downward
movement become -
faster when lever is
YES
operated?
2
l See TESTING AND
Does condition
ADJUSTING.
become normal
- ~oi~~;;$;ssible No when safetv-
suction valve is
3YEs
interchanged?
Is slipper seal of pree
e GotoA
leakage of
cylinder.
- sure compensation
* Max. 20 cc/min
valve free of damage?
l At relief
N- Or does pressure corn- -
- Engine at high idling
O pensatron valve piston
move smoothly?
* his also possible to NO
interchange with
other compensation valve.
- Note: After inspection, do not forget to
return to the original position.
[ Arm, bucket ]
C
Boom
1
Cause
Iefective hydraulic cylinder
ciston packing
Defective operation of
safety-suction valve
Damaged slipper seal of
pressure compensation
valve, or defective operation
of pressure compensation
valve piston
Defective control valve spool
teplace
Defective operation of boom
holding valve
Remedy
Repair or
replace
Remedy
leplace
lepair or
eplace
iepair or
eplace
20-223
0
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