40 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DW7JKB] Bottom Dump Priority Sol. S/C
Action code Failure code
Trouble
Bottom Dump Priority Sol. S/C
(Pump controller system)
— DW7JKB
Contents of
trouble
• When signal is output to bottom dump priority solenoid circuit, abnormal current flows.
Action of
controller
• Stops outputting signal. (Since no current flows, solenoid does not operate.)
Problem that
appears on
machine
• Since bottom dump priority function does not work, bottom dump speed is low when bucket CURL
operation is also performed.
Related
information
• Operating condition (ON/OFF) of bottom dump priority solenoid can be checked with monitoring func-
tion. (Code 02301: Solenoid valve 2)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective bottom dump pri-
ority solenoid (Internal short
circuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
V19 (male) Resistance
Between (2) – (1) 20 – 60 z
Between (2) – ground Min. 1 Mz
2
Ground fault in wiring har-
ness (Contact with GND cir-
cuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP03 (female) (28) –
V19 (female) (2)
Resistance Min. 1 Mz
3 Defective pump controller
aPrepare with starting switch OFF, then turn starting switch ON or keep
it OFF and carry out troubleshooting.
CP03
Bottom dump switch of control lever and left
work equipment control lever
Voltage
(28) –
ground
Switch OFF and left control lever in neutral Max. 1 V
Bottom dump open/close switch ON or arm out
operation
20 – 30 V
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