Troubleshooting - Greenlee 767 Instruction Manual

Troubleshooting

Problem
Oil leak at coupler.
Pump builds pressure, but ram
does not advance, or ram will not
return.
Oil leak at OPEN/CLOSE release
knob (16).
Oil leak at pump plunger (24).
(Attached to handle.)
Oil leak at reservoir end.
Can't hold load or excessive
pumping is required.
Can't raise load with excessive
pumping but handle is rigid.
Load on system causes handle
to lift.
Pump builds pressure when held
in horizontal position but does not
if release knob is in an up (vertical)
position.
Greenlee / A Textron Company
Possible Cause
Fitting loose or damaged.
O-ring is worn or damaged.
Coupler is not tightened sufficiently, and
check balls are not engaged.
O-ring (18) is worn or damaged.
Release stem (15) is bent.
O-ring (25) and/or backup ring (27) are
worn or damaged.
Bladder plug (14) or rubber bladder (12)
is punctured or worn.
O-ring (13) damaged or out of position.
Ball (10) in release knob (16) leaking.
Discharge ball (11) or intake ball (10)
below discharge ball (11) is leaking.
Intake ball (10) below discharge ball (11)
is leaking.
Discharge ball (11) is leaking.
Air in rubber bladder (12).
6
767 Hydraulic Hand Pump
Probable Remedy
Tighten or replace fitting and/or
coupler.
Replace O-ring.
Hand-tighten coupler completely
so check balls engage. Replace
coupler if necessary.
Replace O-ring (18).
Replace release stem (15) and/or
release knob (16).
Replace O-ring (25) and backup
ring (27).
Replace bladder plug (14) and/or
rubber bladder (12).
Replace or reposition O-ring (13).
Check seat for scratches or
contamination. Reseat ball or return
to an authorized Greenlee service
center for repair.
Check seat for scratches or
contamination. Reseat ball or return
to an authorized Greenlee service
center for repair.
Check seat for scratches or
contamination. Reseat ball or return
to an authorized Greenlee service
center for repair.
Refill pump with oil.
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070