H-12 Excessive time lag (engine at low idling)
compensation valve
normal, or does pres-
sure compensation
1
t l Note:
l See below.
I
After inspection, do not forget to return to the original position.
NO
Defective operation of LS
control EPC valve
3epair or
.eplace
* Output pressure of LS control EPC solenoid
Aoorox. 2.06 MPa (Approx. 21 kg.cmZ) output from the LS control EPC solenoid when the engine is at low
Cause
Defective safety-suction
valve, or defective boom
regeneration valve
Defective safety-suction
valve
Defective operation of
pressure compensation
valve or pressure
compensation valve piston
Remedy
TROUBLESHOOTING
H-l 2, H-l 3, H-l 4
Replace
3epair or
.eplace
. .
idling (approx. 1306 rpm or below) regardless of the working mode.
H-13 Lack of power when pressure rises
Cause
* If condition is normal except when pressure rises.
j, Carry out troubleshooting with the swing priority mode OFF.
F-
switch normal?
l Min. 2.74 MPa
(Min 28 kg/en?)
l L/Omode
/iiEii&HL
NO
Defective LS relief valve
Defective main relief valve
Defective operation of 2-
stage relief solenoid valve
l Operate each
control lever, and if
auto-deceleration is NO
canceled, condition
is normal
1 Defective oil pressure switch
h-rote: if PPC shuttle is normal)
Remedy
3eplaca
Xepair or
peplace
3eplace
H-14 Other equipment moves when single circuit is relieved
Cause
Remedy
Defective operation of
I pressure compensation
valve slipper seal
Replace
* The slipper seal in the pressure compensation valve of the circuit that moved is defective.
20-224
0
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