Time Lag Of Work Equipment Is Large - Komatsu PC210-8 Shop Manual

40 Troubleshooting
H-12 Time lag of work equipment is large
Trouble

• Time lag of work equipment is large.

Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
1 Malfunction of LS-EPC valve
Possible
causes and
Malfunction of control valve
standard value
2 (regeneration valve) [Boom
in normal state
and arm only]
Malfunction of control valve
3
(safety-suction valve)
Malfunction of control valve
4 (pressure compensation
valve)
H-13 When part of work equipment is relieved singly, other parts of work
equipment move
Trouble
• When part of work equipment is relieved singly, other parts of work equipment move
Related
information
Possible
causes and
Defective seal of control
standard value
1 valve (pressure compensa-
in normal state
tion valve) on moving side
PC210, 230, 240-8
Cause Standard value in normal state/Remarks on troubleshooting
a
Regeneration valve of control valve may have malfunction. Check it
directly.
Safety-suction valve of control valve may have malfunction. Check
it directly.
a
Pressure compensation valve of control valve may have malfunc-
tion. Check it directly.
Cause Standard value in normal state/Remarks on troubleshooting
Seal of pressure compensation valve of control valve on moving
side may be defective. Check it directly.
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel speed Travel lever
Lo
Hi Operated
This safety-suction valve may be checked by replacing it with
safety-suction valve of normal control valve and seeing
change of condition. (Set pressure of safety-suction valve for
boom head circuit is different, however.)
UEN00245-02
LS-EPC valve output
pressure
Approx. 2.9 MPa
Neutral
{Approx. 30 kg/cm
0 MPa
{0 kg/cm
1
2
}
2
}
1
17