Speed Or Power Of Arm Is Low - Komatsu PC200-8M0 Shop Manual

SEN06139-00
H-7 Speed or power of arm is low
q
Failure

Speed or power of arm is low

Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
Malfunction of left PPC valve
1
(arm circuit)
Malfunction of merge-divider
2
main EPC valve
Malfunction of merge-divider
3
LS-EPC valve
Malfunction of merge-divider
4
main valve
Malfunction of merge-divider
5
LS valve
Malfunction of arm control
6
valve (spool)
Malfunction of arm control
Probable
7 valve (pressure compensa-
causes and cri-
tion valve)
teria
Malfunction of arm control
8
valve (regeneration valve)
Malfunction of arm control
9
valve (quick return valve)
Malfunction or defective
10 sealing of safety valve for
lock valve
Malfunction or defective
11 sealing of arm control valve
(suction valve)
Malfunction or defective
12 sealing of arm control valve
(safety-suction valve)
Malfunction of each control
13
valve (LS shuttle valve)
14 Defective arm cylinder
16
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
Merge-divider main EPC valve may malfunction. Check it.
Merge-divider LS-EPC valve may malfunction. Check it.
Merge-divider main valve may malfunction. Check it.
Merge-divider LS valve may malfunction. Check it.
Spool of arm control valve may malfunction. Check it.
Pressure compensation valve of boom control valve may malfunc-
tion. Check it.
Regeneration valve of arm control valve may malfunction.
Check it.
Quick return valve of arm control valve may have malfunction.
Check it.
Safety valve for lock valve may malfunction or sealing may be
defective. Check it.
Suction valve of arm control valve may malfunction. Check it.
Safety-suction valve of arm control valve may malfunction or seal-
ing may be deflective. Check it.
LS shuttle valve of right travel control valve, boom control valve,
left travel control valve, bucket control valve, or service control
valve may malfunction. Check it.
a Be ready with engine stopped, then troubleshoot with engine at
full speed.
Left work equipment control
H-7 Speed or power of arm is low
Criteria and troubleshooting procedure
lever
Neutral
Arm IN
Arm OUT
lever
Arm IN relief
PC200, 200LC, 220, 220LC-8M0
PPC valve output pressure
0 MPa
2
{0 kg/cm }
2.84 to 3.43 MPa
2
{29 to 35 kg/cm }
Leakage from arm cylinder
20 cc/min