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40 Troubleshooting
Defective adjustment
6
or malfunction of LS
Possible
valve
causes and
standard value
in normal state
Malfunction of servo
7
piston
8 Defective piston pump
Note 1: Disconnect the hydraulic hose and piping (travel main circuit) and install adapters to block the ends.
BR380JG-1E0
Cause
a Prepare with engine stopped, then run engine at high idle and carry out
troubleshooting.
Oil pressure to be
Pump discharge
LS valve output
If the oil pressure does not become normal after adjustment, the LS valve
may have a malfunction or a defect in it. Check the LS valve directly.
The servo piston may have malfunction. Check it directly.
If all the results of the above checks are normal, the cause may be lowering
of performance, malfunction, or internal defect of the piston pump.
Standard value in normal state/Remarks on troubleshooting
Turn all work equipment
measured
switches OFF
pressure
Almost same
pressure
SEN02306-01
Ratio of oil pressure
Turn all work equipment
switches ON
(with no load)
1
Approx. 3/5
9
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Table of Contents
Troubleshooting
