Form No. 102977
Rev. 2 Jun. 02, 2022
9© SPX FLOW, Inc.
• To help prevent personal injury, any repair work or troubleshooting must be done by qualied
personnel familiar with this equipment.
• Use the proper gauges and equipment when troubleshooting.
NOTE:
• It is often best to check for leaks by using a hand pump and applying pressure to the suspect
area without the motor running. Watch for leaking oil and follow it back to its source.
• Plug the outlet ports of the pump when checking for leakage to determine if the leakage is in
the pump or in the cylinder or tool.
• Refer to the Parts List #101990 included with your particular pump when using this
troubleshooting guide.
PROBLEM CAUSE SOLUTION
Pump is not delivering oil
or delivers only enough
oil to advance cylinder(s)
partially or erratically.
1� Oil level too low� 1. Fill reservoir to 1/2” from top of ller hole
with all cylinders retracted�
2. Loose-tting coupler to
cylinder�
2� Check quick-disconnect couplings to
cylinders� Inspect couplers to ensure
that they are completely coupled�
Occasionally couplers have to be
replaced because the ball check does
not stay open due to wear�
3� Air in system� 3� Bleed the system�
4� Air leak in suction line� 4� Check and tighten suction line�
5. Dirt in pump or lter
plugged�
5. Pump lter should be cleaned and, if
necessary, pump should be dismantled
and all parts inspected and cleaned�
6� Oil is bypassing through the
double-acting cylinder�
6� By removing the cylinder and capping
the hoses, the pump and valve can
be checked� Observe if pump holds
pressure�
7� Cold oil or oil too heavy
(Hydraulic oil is of a higher
viscosity than necessary)�
7� Change to a lighter oil�
8� Relief valve or low pressure
unloading valve out of
adjustment�
8� Adjust as needed�
9� Reservoir capacity is too
small for the size of the
cylinder(s) used�
9� Use smaller cylinder(s) or larger
reservoir�
10� Defective directional valve� 10� Inspect all parts carefully and replace if
necessary�
TROUBLESHOOTING GUIDE
