Speed Or Power Of Arm Is Low - Komatsu PC210-8 Shop Manual

40 Troubleshooting
H-8 Speed or power of arm is low
Trouble

• Speed or power of arm is low

Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
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)
Possible
Malfunction of arm control
causes and
7 valve (pressure compensa-
standard value
tion valve)
in normal state
Malfunction of arm control
8
valve (regeneration valve)
Malfunction of arm control
9
valve (quick return valve)
Malfunction or defective seal
10
of safety valve for lock valve
Malfunction or defective seal
11 of arm control valve (suction
valve)
Malfunction or defective seal
12 of arm control valve (safety-
suction valve)
Malfunction of each control
13
valve (LS shuttle valve)
14 Defective arm cylinder
PC210, 230, 240-8
Cause Standard value in normal state/Remarks on troubleshooting
a
Left work equipment control lever
Merge-divider main EPC valve may have malfunction. Check it
directly.
Merge-divider LS-EPC valve may have malfunction. Check it
directly.
Merge-divider main valve may have malfunction. Check it directly.
Merge-divider LS valve may have malfunction. Check it directly.
Spool of arm control valve may have malfunction. Check it directly.
Pressure compensation valve of arm control valve may have mal-
function. Check it directly.
Regeneration valve of arm control valve may have malfunction.
Check it directly.
Quick return valve of arm control valve may have malfunction.
Check it directly.
Safety valve for lock valve may have malfunction or defective seal.
Check it directly.
Suction valve of arm control valve may have malfunction or defec-
tive seal. Check it directly.
Safety-suction valve of arm control valve may have malfunction or
defective seal. Check it directly.
LS shuttle valve of right travel control valve, boom control valve, left
travel control valve, bucket control valve, or service control valve
may have malfunction. Check it directly.
a
Left work equipment control lever
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Neutral
Arm curl
Arm dump
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Arm curl relief
UEN00245-02
PPC valve output pressure
0 MPa
2
{0 kg/cm }
2.84 – 3.43 MPa
2
{29 – 35 kg/cm }
Leakage from arm cylinder
20 cc/min
1
13