Komatsu Galeo PC850-8 User Manual

10 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DH26KB] R Jet Sensor S/C
Action code Failure code
Trouble
R Jet Sensor S/C
(Pump controller system)
— DH26KB
Contents of
trouble
• Signal voltage of R jet sensor differential pressure sensor circuit is above 4.5 V.
Action of
controller
• Minimizes deliveries of both F and R pumps if trouble is detected during operation.
Once travel and work equipment levers are returned to neutral after trouble has occurred, deliveries of
both F and R pumps are fixed (50% of capacity).
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on
machine
• Travel speed and work equipment speed do not rise.
• Fine control performance lowers.
Related
information
• Information of R jet sensor differential pressure sensor can be checked with monitoring function.
(Code 13801: Sensor differential pressure, Code 13803: Sensor voltage)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective 5V sensor power
supply system
If failure code [DA25KP] is also displayed, carry out troubleshooting for
it first.
2
Defective R jet sensor dif-
ferential pressure sensor
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
P28 Measurement conditions Voltage
Between (1) – (2) Engine stopped 4.5 – 5.5 V
Between (3) – (2) Engine stopped 0.5 – 1.5 V
Between (4) – (2) Engine stopped 0.5 – 1.5 V
3
Ground fault in wiring har-
ness (Short circuit with
GND circuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP01 (female) (22) –
J24 – P28 (female) (1) and chassis ground
Resistance Min. 1 Mz
Wiring harness between CP01 (female) (20) –
J27 – P28 (female) (3), (4) and chassis ground
Resistance Min. 1 Mz
4 Defective pump controller
If causes 1 – 3 are not detected, pump controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)

Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English