Sharp SH-920 Instruction Manual page 68

Hydraulic-related defects, Causes and Remedy
【III】
No. Defects
3-1 Hydraulic motor
is not working
3-2 Table longitudinal
movement is
slowing down.
Checkup
1) Wire lose of hydraulic
motor switch
2) Magnetic switch/overload
relay of pump motor are not
working properly.
1) Check lubrication oil on
the slideways
a. Lubricant outlet on the
slideways or lubrication
controlled switch is
blocked.
b. Not enough lubrication oil
in the oil tank.
c. Lubrication pump is in
proper pressure of 3-4 bar
(3~5kgf/cm 2 ).
d. Filter inside the lubrication
oil tank is blocked.
2) Move the table to the
extremely end, turn on the
flow control lever at full
speed to see that the
pressure indicator should
stand still.
a. The pressure gauge
indicator 'downward'
movement which means
the leakage inside the
cylinders.
P.68 OF 70
Remedy
Check the wire or change the
motor switch.
Check the connecting wires
or change the whole set of
magnetic switch.
a. Clean up
b. Add Mobil #2 or its
equivalent as
recommended.
c. Adjust to proper pressure
d. Clean the oil tank and add
new oil
a. Replace the O-ring/seals
of the cylinders.