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absorption is
not smooth
2. The tank level is too low
The tank is filled with hydraulic fluid
as required
3. The installation position of the oil
pump is too high; Suction range
exceeds specified
According to the suction range of the
oil pump, it is within 500mm
4, the oil temperature is too low, the
oil viscosity is too high
Change oil or heat oil seasonally
5, suction tubing is too thin or too
long, too much resistance
Change the large diameter tubing,
shorten the length of suction tubing
6. The oil seal of the oil pump is
damaged and the air is inhaled
Replace the new oil seal
7. The rotation of the oil pump is not
correct or the speed is too high
Change the oil pump rotation, make
the speed to the specified value
8, oil suction side leakage
Check the oil absorption part and its
seal, and replace the failed seal
The oil outlet
of the oil
pump
discharges oil
but the
pressure
cannot rise
1. The side plate of the oil pump is
severely worn and the volume
efficiency is too low
Repair or replace the oil pump
2. The cone spool of the relief valve is
severely worn
Replace the new cone spool
3. The overflow valve is stuck by
stolen goods and loosely closed
Filter oil and remove dirt
4. The pressure regulation of relief
valve is too low
Adjust the overflow valve to the
specified value
5, oil suction air
Check whether the sealing ring at the
oil suction port is damaged
Low volume
efficiency of
oil pump
1. The sealing parts in the oil pump
are damaged
Replace seal ring
2, side plate wear
Replace the side panel
3. There are stolen goods or too large
clearance in the oil pump
Remove stolen goods and filter oil;
Replacement of new oil pump
4. The oil pump speed is too low or too
high
Make the oil pump run within the
specified speed range
5. Negative pressure appears in the
tank
Increase the capacity of air filters
