14 PC800, 850-8
SEN00790-02 40 Troubleshooting
Failure code [B@HANS] Hydr. Oil Overheat
Action code Failure code
Trouble
Hydr. Oil Overheat
(Machine monitor system)
— B@HANS
Contents of
trouble
• While engine was running, signal of hydraulic oil temperature sensor input 102°C or higher.
Action of
controller
• None in particular.
Problem that
appears on
machine
• If machine is operated as it is, hydraulic components may be seized.
Related
information
• If hydraulic oil temperature monitor on the machine monitor lights up in red while the engine is running,
this failure code will be recorded.
• Input from the hydraulic oil temperature sensor (temperature) can be checked with monitoring func-
tion.
(Code 04401: Hydraulic oil temperature, 04402: Hydraulic oil temperature sensor voltage)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Hydr. Oil Overheat
(when system is normal)
Check the hydraulic oil for overheating. If it has been overheated, find
out the cause and check the hydraulic equipment for damage, then
repair.
2
Defective hydraulic oil tem-
perature sensor
(Internal short circuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
P22 (male)
Hydraulic oil
temperature
Resistance
Between (1) – (2)
10 – 100°C
90 – 3.5 kz
Between (2) –
chassis ground
Min. 1 Mz
3
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between P02 (female) (12) –
P22 (female) (1) and chassis ground
Resis-
tance
Min. 1 Mz
4 Defective machine monitor
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
P02 (female)
Hydraulic oil
temperature
Resistance
Between (12) – (13)
10 – 100°C
90 – 3.5 kz
Between (12) –
chassis ground
Min. 1 Mz
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