TM 9-4910-701-14&P
2.
There may be dirt under the discharge ball in one of the pump
These should be flushed or cleaned as suggested in In-
valves.
struction 4 of Section 1.
When this condition exists, the handle
raises as the saddle lowers.
3.
The ram leather cup may be worn.
This is likely only in jacks
given very heavy service.
To inspect this cup, first remove hydrau-
Place unit in vise
lic unit from chassis (see Instruction 5 ).
so ram end is up and jaws of vise rest on unit casting.
Remove
Remove 18285 End Nut Casting and pull out
18335 Ram Packing Nut.
ram by hand.
Inspect ram cup and install new one if worn.
Dip
new cup in oil before inserting ram into cylinder, taking care
not to damage leather.
When reassembling, place a thin coat of
shellac on end of reservoir tube and firmly tighten down end nut.
Inspect ram packings and replace if worn.
Tighten down packing
nut to medium pressure.
IF JACK WILL NOT LIFT FULL FOUR TON CAPACITY
III.
1.
Release screw may be worn.
See
instruction
6
of
Section
1.
2.
See
Instruction
3
of
Section
II.
Ram cup leather may be worn.
3.
Discharge ball in high pressure pump valve may not be seating
properly.
See Instruction 4 of Section 1.
IV.
SAFETY VALVE SETTING
1.
The Model GH-G is protected by a safety valve against damage through
This valve is carefully set before leaving the factory
overloading.
and no further adjustment should be necessary.
V.
REFILLING
INSTRUCTIONS
If your jack does not raise to full height, it is probably
1.
low on oil. Be sure release valve is open and saddle
down ; then slowly remove the filler screw from unit marked
Refill through filler hole until oil reaches
top of oil level hole.
Use only specified hydraulic fluid
and be sure no dirt enters the unit.
