HMP-0567E Rev.7 (18/19)
6. Faults and Corrective Actions
In the event of the problems listed below, stop the motor immediately and perform an inspection,
as described in Table-6.1.
(A) No hydraulic fluid is discharged.
(B) No pressure increase occurs.
(C) The volume of noise is large.
(D) An abnormal increase in fluid temperature occurs.
Table-6.1Typical Causes of Faults in Hydraulic System and Corrective Actions
(A) No hydraulic
fluid is discharged
The direction of rotation of the
motor is incorrect.
Correct the direction. (Refer to Section 3.1.)
Refuel the pump so that the fluid level in the oil gauge
aligns with the oil gauge upper limit line.
The suction pipe or suction
filter is clogged.
Clean the suction pipe and suction filter.
If the suction pipe/filter is heavily clogged, replace the
hydraulic fluid.
Air is drawn in from the suction
pipe.
Using an oil gauge, confirm that there is a suitable
volume of fluid. Repair the gasket at the pipe joint.
Tighten the threaded joint of the suction pipe to an
adequate degree.
The pump shaft does not
rotate.
Inspect the motor and coupling.
Check that the pump shaft can be rotated easily using
a spanner etc. If it does not rotate, the interior of the
pump may be damaged.
(B) No pressure
increase occurs.
The pressure setting of the
relief valve is too low.
Adjust the pressure to the correct setting using an
accurately calibrated pressure gauge.
The relief valve is stuck.
After disassembling and cleaning the pressure
regulating section, adjust or replace parts as required.
There is a large amount of
leakage in the hydraulic circuit
system (leakage from the
cylinder/valve).
Inspect the relevant parts by individually blocking each
section of the hydraulic circuit, and adjust or replace
parts as required.
The pump is operating at an
RPM below the minimum rated
RPM.
Increase the RPM.
(Refer to Section 3.9.)
To Next Page
Loading...