Sheet No.
5 of 6
Rev 3
Date: 25 May 2012
Operating Instructions Form No. 1000090
PROBLEM
CAUSE
SOLUTION
Pump is not delivering oil or
delivers only enough oil to
advance wrench(s) partially or
erratically (continued).
1. Oil level too low.
2. Loose-fitting coupler to wrench.
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 wrench.
7.
Cold oil or oil 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 wrench(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 1/2" from top of
filler hole with wrench retracted.
2. Check quick-disconnect
couplings to wrench. 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. Bleed the system.
4. Check and tighten 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 wrench and
capping the hoses, the pump
and valve can be checked.
Observe if pump holds
pressure.
7.
Change to a lighter oil.
8.
Adjust as needed.
9.
Use smaller wrench(s) or larger
reservoir.
10. Inspect all parts carefully and
replace if necessary.
11. Replace.
12. 3450 RPM motor: Refer to
electrical schematic on motor.
12,000 RPM motor: Reverse
lead wires to brush holders.
Air motor: Air line connected
into wrong port.
13. Check for plugged vent in filler
plug.
14. Remove end cap from low
pressure gear pump. Clean
pump, and replace worn gears,
shifting spool, body or end cap.
