Komatsu Galeo PC800-8 User Manual

34 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DW7BKA] Fan Reverse Sol. Disc.
Action code Failure code
Trouble
Fan Reverse Sol. Disc.
(Pump controller system)
— DW7BKA
Contents of
trouble
• When signal is output to hydraulic fan reverse solenoid circuit, no current flows.
Action of
controller
• None in particular (The solenoid does not function as there is no current flowing to it)
• When the failure cause disappears of itself, the machine operation returns to normalcy.
Problem that
appears on
machine
• Fan does not rotate in reverse.
Related
information
• Operating condition (ON/OFF) of fan reverse solenoid can be checked with monitoring function. (Code 02300 :
Solenoid 1)
• Since disconnection of solenoid is detected while output is turned ON, be sure to turn output ON (rotate fan in
reverse) when checking reproduction of failure after repair.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective hydraulic fan
reverse solenoid (Internal
disconnection)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
V17 (male) Resistance
Between (1) – (2) 20 – 60 z
2
Disconnection of wiring har-
ness (Disconnection of
defective contact with con-
nector)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between CP03 (female) (25) –
V17 (female) (1)
Resistance Max. 1 z
Wiring harness between V17 (female) (2) –
CP03 (female) (3), (13), (17)
Resistance Max. 1 z
3
Short-circuiting of wiring
harness (Contact with 24 V
circuit)
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
Between wiring harness between CP03
(female) (25) – V17 (female) (1) and grounding
Voltage Max. 1 V
4
Pump controller
defective
aTurn the engine starting switch OFF for the preparations, and keep the
engine running during the troubleshooting.
CP03 (female) Resistance
Between (25) and grounding 20 – 60 z

Komatsu Galeo PC800-8 Specifications

General

Brand	Komatsu
Model	Galeo PC800-8
Category	Excavators
Language	English