There may be dirt under the discharge ball in one of the pump
These should be flushed or cleaned as suggested in In-
struction 4 of Section 1.
When this condition exists, the handle
raises as the saddle lowers.
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 18285 End Nut Casting and pull out
18335 Ram Packing Nut.
ram by hand.
Inspect ram cup and install new one if worn.
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
Release screw may be worn.
Ram cup leather may be worn.
Discharge ball in high pressure pump valve may not be seating
See Instruction 4 of Section 1.
SAFETY VALVE SETTING
The Model GH-G is protected by a safety valve against damage through
This valve is carefully set before leaving the factory
and no further adjustment should be necessary.
If your jack does not raise to full height, it is probably
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
Use only specified hydraulic fluid
and be sure no dirt enters the unit.