TROUBLESHOOTING
H-15, H-16
H-15 In L/O, F/O modes, work equipment speed is faster than specified
speed
2 YE-S
Yl
1
Is oil pressure
r-l
normal when
pump is relieved?
* At arm relief
Front pump:
Approx. 34.6 MPa
(Approx. 355 kg/cm’)
Rear pump:
Approx. 5.9 MPa N
(Approx. 60 kg/cm?)
* At bucket relief
Front pump:
Approx. 5.9 MPa
(Approx. 60 kg/cm’)
Raer pump:
Approx. 34.6 MPa
(Approx. 355 kgfcm*)
* Swing priority mode
Is output pressure
i of LS control EPC
solenoid valve
normal?
l See below.
NO
. Min. 2.7 MPa
(Min. 28 kg/cm?
I
* L/O mode
NO
Defective LS valve
Repair or
replace
Defective operation of LS
control EPC solenoid valve
Repair or
replace
Defective operation of LS
merge-divider valve
Repair or
replace
Defective operation of main
merge-divider valve
?epair or
,eplace
Defective operation of pump
merge-divider solenoid valve
qepair or
,eplace
Remedy
* Output pressure of LS control EPC solenoid (travel OFF)
l Approx. 2.06 MPa (Approx. 21 kg/cm? is output from the LS control EPC solenoid when the engine is at low
idling (approx. 1300 rpm or below) regardless of the working mode.
H-16 In compound operations, work equipment with larger load is slow
Cause Remedy
Defective operation of pressure
compensation valve
Replace
(replace pressure compensation valve on side where load is lower)
Combination of compound operation
Side where load is larger
I
I I
1 Boom RAISE + arm IN
I
Boomerang
2
Boom RAISE + arm OUT
Arm OUT
3 Boom RAISE + bucket CURL Boom RAISE
I I
4 Arm OUT + bucket CURL
I
Arm OUT-1
I I
5 Boom LOWER + arm OUT
I
Arm OUT
I
20-225
a
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