Troubleshooting - Greenlee 980 Instruction Manual

Troubleshooting—Hydraulic Pump (cont'd)
PROBLEM
Motor starts, but stops when
it encounters a load.
Ram will not advance.
Ram advances slowly.
Ram will not advance completely.
Greenlee / A Textron Company
PROBABLE CAUSE
Voltage supplied to motor is too low.
Current rating of extension cord is too
low.
Motor is overheated.
Misalignment of the motor shaft and
low pressure pump drive shaft.
The counterweight needs adjustment.
Motor is damaged or worn out.
Low-pressure system has a partial
or complete failure.
Unvented plug has not been replaced.
Oil level is too low.
Wrong oil viscosity.
Oil is dirty.
Oil is cold.
11
980 Hydraulic Power Pump
POSSIBLE REMEDY
Unplug cord and check power source
with a voltmeter. The voltage should
be 120 VAC (+/– 10%).
See the extension cord specifications
under Electrical Connection in the
Setup section of this manual.
Let motor cool. Do not run motor
continuously in a hot environment.
Replace reservoir cover plate (22).
See Motor Face Seal, Figure A1, for
the correct setting of the counterweight.
Replace motor.
See Hydraulic Schematic (1, 3, 7)
and refer to Figure A4 in the Repairs
section of this manual.
Remove the unvented plug and install
the vented plug.
Add oil per instructions in the
Maintenance section of this manual.
Replace oil with the type recommended
in the Specifications section of this
manual.
Replace oil with the type recommended
in the Specifications section of this
manual.
Preheat oil. Without an accessory
connected to the coupler, run the pump
to build pressure, then release. Repeat
until oil is warm.
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