TROUBLESHOOTING H-23. H-24
H-23 Travel speed does not switch or is faster than specified speed
*
Carry out troubleshooting in the H/O mode.
Is travel oil
Is pump pressure
sensor normal?
NO
l Using monitoring
code 11 and 12.
* En?;; at high NO
l Measure pump
pressure.
l See JUDGEMENT
TABLE
l Note:
If auto-deceleration
NO
is canceled when
travel is operated,
system is normal.
rable 1 Output pressure of LS control EPC valve
Lo Mi
i
-I
il
Cause
Iefective operation of travel
speed selector servo piston
3efective operation of travel
speed solenoid valve
Defective operation of LS
control EPC valve
Defective pump pressure
sensor
Dek;;;ive travel oil pressure
I
Hi
PC200 2.0 f 0.2 MPa
PC21 0 (20 fi 2 kg/cm?
PC220 1.8 f 0.2 MPa
PC250 (18 f 2 kg/cm?
2.0 f 0.2 MPa
(20 h 2 kg/cm?
1.8 f 0.2 MPa
(18 f 2 kg/cm?
0.2 f 0.2 MPa
(2 + 2 kg/cm?
0.2 f 0.2 MPa
(2 f 2 kg/cm?
Remarks
l Engine at high idling
l Travel lever at fine control position (auto-deceleration canceled)
H-24 Trave
#I does not move (one side only)
1
1
F
Cause
Remedy
?eplace
Repair or
replace
Repair or
replace
Replace
Replace
Es
. Defective final drive
3 YES
Does condition
yEs become normal when
- left and right suction -
2 valves of control valve
- are interchanged?
Is drain amount of
NO
trrzaytor
Defective operation of
suction valve of control valv
Defective counterbalance
valve, or defective operatior
of travel motor safety valve
l Max. : 30 Ilmin
l Engine at high
NO
Defective travel motor
idling
l At travel relief
e
Replace
20-232
0
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