Sheet No.
Issue Date: Rev. C September 19, 2011
© SPX
Parts List & Operating Instructions Form No. 538016
Troubleshooting Guide
The greatest single cause of failure in hydraulic pumps is dirt. Keep the pump and attached equipment clean
to prevent foreign matter from entering the system. Seal unused couplers with thread protectors. Keep hose
connections free of dirt and oil.
Pump reciprocates, but no
uid delivery. (Cylinder does
not extend.)
Low uid delivery. (The
cylinder extends slowly.)
Pump will not build to
maximum pressure, and
there's no visible leakage.
Pump builds pressure, but will
not hold pressure.
Pump continues to run
slowly even after the desired
pressure has been reached.
There is excess oil spray from
the mufer.
Problem Cause Solution
1. Low uid level.
2. Pump is not primed.
3.
Fluid intake lter contaminated.
4. Overload conditions.
1. Air supply not adequate.
2. Contamination on air side of
pump.
3. Contamination on hydraulic
side of pump.
4. Air in hydraulic system.
1. Air supply not adequate to
obtain maximum pressure.
2. Pressure regulator not set
correctly.
1. Leak in hydraulic system.
1. Output pressure equal to, or
higher than, relief valve setting.
1. Air lubricator is set too rich, if
so equipped.
1. Add hydraulic uid to within 19
mm (3/4 inch) of ller / vent hole.
2. Press RELEASE end of pedal
while holding down air intake
valve. Allow pump to cycle for
approx. 15 seconds.
3. Remove pump assembly from
reservoir, and clean intake lter.
4. Use equipment with sufcient
capacity for the job.
1. Verify air input supply is
5–10
CFM @ 7 bar (100 psi) minimum.
2. Clean air inlet screen on air
side of pump.
3. Remove pump assembly from
reservoir, and clean intake lter.
4. Position cylinder at a lower
level than the pump. Run
system through several cycles
of extending and retracting the
cylinder.
1. Verify air input supply is
5–10
CFM @ 7 bar (100 psi) min.
2. Verify air is regulated at 7 bar
(100 psi) at the pump.
1. Check all hydraulic
connections for leakage, and ret
or repair as needed.
1. Normal operation.
1. Regulate air lubricator to one
drop per minute.
3 of 4
Draining and Flushing the Reservoir continued–
7. Position the pump assembly (with gasket) on the reservoir, and install the bolts. Torque the bolts to 2.8–3.4
N•m (25–30 inch pounds).
8. Drain and clean the other hydraulic components (hoses, cylinders, etc.) before reconnecting them to the
pump. This should prevent contaminated uid from entering the pump again.
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