Greenlee 980 - Troubleshooting

Greenlee / A Textron Company 11 4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
980 Hydraulic Power Pump
Troubleshooting—Hydraulic Pump (cont’d)
Motor starts, but stops when Voltage supplied to motor is too low. Unplug cord and check power source
it encounters a load. with a voltmeter. The voltage should
be 120 VAC (+/– 10%).
Current rating of extension cord is too See the extension cord specifications
low. under Electrical Connection in the
Setup section of this manual.
Motor is overheated. Let motor cool. Do not run motor
continuously in a hot environment.
Misalignment of the motor shaft and Replace reservoir cover plate (22).
low pressure pump drive shaft.
The counterweight needs adjustment. See Motor Face Seal, Figure A1, for
the correct setting of the counterweight.
Motor is damaged or worn out. Replace motor.
Ram will not advance. Low-pressure system has a partial See Hydraulic Schematic (1, 3, 7)
Ram advances slowly. or complete failure. and refer to Figure A4 in the Repairs
Ram will not advance completely. section of this manual.
Unvented plug has not been replaced. Remove the unvented plug and install
the vented plug.
Oil level is too low. Add oil per instructions in the
Maintenance section of this manual.
Wrong oil viscosity. Replace oil with the type recommended
in the Specifications section of this
manual.
Oil is dirty. Replace oil with the type recommended
in the Specifications section of this
manual.
Oil is cold. Preheat oil. Without an accessory
connected to the coupler, run the pump
to build pressure, then release. Repeat
until oil is warm.
PROBLEM PROBABLE CAUSE POSSIBLE REMEDY