Operating Instructions
NOTE:
•
Use the proper gauges and equipment when troubleshooting.
•
Depending on the pump version, 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
if it is in the cylinder or tool.
•
Refer to Parts List #100716 or #100717 and the hydraulic schematic when using this troubleshooting
guide.
Form No. 102561
PROBLEM
CAUSE
SOLUTION
Pump is not delivering oil or
delivers only enough oil to
advance ram(s) partially or
erratically
(1) Oil level too low
(2) Loose fitting coupler to ram
(3) Air in system
(4) Air leak in suction line
(5) Dirt in pump or filter plugged
(6) Oil is bypassing through the
double-acting cylinder
(7) Cold oil or oil is too heavy
(Hydraulic oil is of a higher viscosity
than necessary)
(8) Relief valve or low pressure
unloading valve out of adjustment
(9) Reservoir capacity is too small
for the size of the cylinder(s) used
(10) Defective directional valve
(11) Sheared drive shaft key(s)
(12) Motor rotating in wrong
direction
(13) Vacuum in reservoir
(14) Low pressure pump worn
(1) Fill reservoir to within 1/2" of filler
plug with all cylinders retracted.
(2) Inspect couplers to insure that
they are completely coupled.
Occassionally couplers have to be
replaced because the ball-check
does not stay open due to wear.
(3) Bleed the system.
(4) Check and tighten the suction
line.
(5) Pump filter should be cleaned
and if necessary, pump should be
dismantled and all parts inspected
and cleaned.
(6) By removing the ram and
capping the hoses, the pump and
valve can be checked. Observe
whether or not the pump will hold
pressure.
(7) Change to lighter oil
(8) Readjust as needed.
(9) Use smaller cylinder(s) or larger
reservoir.
(10) Inspect all parts carefully and
replace if necessary.
(11) Replace
(12) Air line connected into wrong
port.
(13) check for plugged vent in filler
plug.
(14) Clean pump parts, replace worn
gerotor set, repair or replace the
pump housings.
Sheet No.
3 of 4
Rev. 3 Date: 25 May 2012
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