Greenlee / A Textron Company 12 4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
980 Hydraulic Power Pump
Troubleshooting—Hydraulic Pump (cont’d)
Ram will not advance. Ram The intake strainer is dirty or clogged. Remove the strainer and clean with
advances slowly. Ram will not kerosene.
advance completely. (cont’d)
Motor rotates in the wrong direction. Correct the motor wiring. See the
Motor Control, Schematic Diagram in
the Motor Control Unit section of this
manual.
Low-pressure relief valve is dirty or is
To clean and adjust this valve,
set
incorrectly. see Low-Pressure Relief Setting,
Figure
A4 in the Repairs section of
this manual.
Broken internal part. Inspect and/or replace drive pin (78),
motor shaft key (34), rollpin (39), or
drive shaft (77).
Worn or damaged internal part. Inspect and/or replace the gerotor (80);
eccentric shaft (38), or bearings
(37 and/or 41).
Pilot-operated valve will not close. See “Troubleshooting—Pilot-Operated
Valve” at the end of this troubleshooting
section.
Internal hydraulic fluid leak. Inspect and replace as necessary:
O-ring Plug (79) & Pump Block Cover (50).
Ram advances erratically Air in the hydraulic fluid. Refer to Purging (Bleeding) Air in the
and retracts erratically. Maintenance section of this manual.
PROBLEM PROBABLE CAUSE POSSIBLE REMEDY
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