Hydraulic Oil Temperature Gauge Does Not Indicate Normally - Komatsu PC130-8 Shop Manual

40 Troubleshooting
E-10 Hydraulic oil temperature gauge does not indicate normally
(1) While hydraulic oil temperature is rising normally, temperature gauge does not rise from white
Trouble range (C).
(2) While hydraulic oil temperature is stabilized normally, temperature gauge rises to red range (H).
• Signals of hydraulic oil temperature sensor are input to pump controller and then transmitted to
Related machine monitor through communication system.
information • Hydraulic oil temperature can be checked with monitoring function.
(Code: 04401 Hydraulic oil temperature)
Defective hydraulic oil tem-
1 perature sensor (Internal dis-
connection or short circuit)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
Ground fault in wiring har-
and standard
3 ness (Short circuit with GND
value in normal
circuit)
state
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective pump controller
6 Defective machine monitor
Circuit diagram related
PC130-8
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between (2) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CP01 (female) (29)
– P22 (female) (2)
Wiring harness between CP01 (female) (46)
– P22 (female) (1)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CP01 (female) (29)
– P22 (female) (2) and chassis ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between CP01 (female) (29)
– P22 (female) (2) and chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between (29) – chassis ground
If causes 1 – 5 are not detected, machine monitor may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
P22 (male)
Between (1) – (2)
CP01 (female)
Between (29) – (46)
SEN04123-01
1
Resistance
3.5 – 90 kz
Min. 1 Mz
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Voltage Max. 1 V
Resistance
3.5 – 90 kz
Min. 1 Mz
27