TM 9-4910-710-14&P
release screw for scratches and damage.
If old release screw is
reinstalled in the jack, it is recommended that new packing be
used.
New release screws are shipped complete with packing.
II.
JACK LOWERS UNDER LOAD
1.
Be sure release valve is closed.
Refer
to
instruction
Release valve
may
need
cleaning
or
replacement.
2.
6, Section I.
3.
Valves may not be closing.
Refer to instruction 4, Section I.
4.
Ram cup may be worn.
If the ram (6) lowers under load, it is an
indication of oil leaking past a worn, damaged, or defective ram
cup (8).
Check the condition of the ram cup by removing the top
nut (4) and extracting the ram (6) from the cylinder (11).
While
the ram is removed from the cylinder, the cylinder should be checked
for scoring or any other damage.
Before reassembly, remove old shellac from top of reservoir tube
(5).
Top of reservoir tube should then be brushed with shellac,
and top nut (4) installed securely.
III.
JACK WILL NOT LIFT FULL CAPACITY
1.
Ram cup may be worn.
Refer to instruction 4, Section II.
Pump valves may not be closing.
2.
Refer to instruction 4, Section I.
IV.
REFILLING
INSTRUCTIONS
Filler
Jack should always be filled with oil to filler hole level.
1.
hole is located on reservoir tube approximately 2/3 the way up the
tube.
Oil level should be checked with the ram fully retracted and
the jack standing in the upright position.
Make sure no dirt or
other foreign matter enters the reservoir while checking oil level
and refilling.
4