Greenlee 767 - Troubleshooting

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