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OPERATING INSTRUCTIONS
1.- Assemble handle front section to larger sec-
tion using pin provided.
2.- When this jack leaves the factory for ship-
ment, the vent plug on top of the oil chamber
is closed to prevent the oil from being spilled.
Also the oil chamber contains the right amount
of oil before shipment: Before using for the
first time, remove cover plate, unscrew vent
plug util there is 1/16” gap if oil spill is evident,
or if vent plug was found open, it is necessary
to check oil level before pumping.
3.- With release valve open, pump handle
about 6 full strokes to assure complete distri-
bution of oil.
4.- Close release valve, and jack is ready to use.
5.- Always center the load on saddle of jack.
Off - center loads and loads lifted while jack is
not stting level may damage the jack.
GENERAL CARE OF YOUR JACK
1.- When jack is not in use lifting arm and
pump lever should be in full down position.
This will protect precision machined surfaces
of the ram and the piston, from corrosion.
2.- Container is filled with hydraulic jack oil.
3.- Keep your jack clean and well lubricated,
as well as the outside moving parts such as the
lifting arm spindle, wheel bearings and cross
head pin.
HOW TO LOCATE AND REMEDY
TROUBLE
1.- IF JACK WILL NOT RAISE OR LIFT LOAD
a) Before attempting to locate the specific
trouble, inspect oil level in the following man-
ner place jack on level position.
Open release valve correct oil level is at botton
of thread inside oil chamber when lifting arm
is at full down position.
If lacking oil remove vent plug located under
cover plate. Fill with oil to correct level and
install and tighten the plug.
Close release valve and pull lifting arm up to
its full height. Then open release valve and
by stepping on saddle force it to lower as ra-
pidly as possible. Repeat this operation three
or four times. This procedure will thoroughly
flush the valves and assure complete distribu-
tion of oil. It most cases it will restore the jack
to proper working order. Close release valve
tightly. Try jack under load.
b) The jack may have air trapped in the sys-
tem: Open release valve. Pump handle 6 full
strokes. Close release valve and try jack again.
c) O - ring seal for pump may be worn: This
will happen only after months of sevice. a new
O- ring seal or a complete new piston can be
purchased and easily installed.
d) Release valve may be held open by dirt on
seat. Flush by pulling lifting arm up and down
several times while release valve may be remo-
ved for cleaning the valve and valve seat.
2.- IF JACK LEWERS UNDER LOAD
a) The discharge valve may be held open by
dirt on ball seat: When a dirty discharge valve
or ball seat exists, the jack may lower quickly
causing handle to fly back with force. This is
caused by the oil rushing back into the pump
chamber through the open ball seat. When
this happens it is advisable to repeat procedu-
re (1-a) before going throung the partial di-
sassembly of the hydraulic unit. The discharge
valve is located at he bottom of ram cylinder
there is a screen washer. This must be removed
carefully and if damaged a new one must be
fitted. Now remove the discharge valve ball
and clean valve seat. Wipe ball and replace
and reseat. Use 1/4” diameter x 3” long tap
with a small hammer. This will with a small
hammer. Place the punch on top of ball and
give the puch a light have the effect of resea-
ting the ball on its seat.
Install the screen washer. Screw in ram cylin-
der tightly. Replace washers top and botton
of oil chamber, install ram assembly and screw
in top nut.
b) Cup seal for the ram may be worn: This is
likely only in jacks that have given very heavy
service. Follow above procedure (2-a) until ac-
cess to ram assembly is made. Remove worn
seal by pulling away or cutting with a small
knife. Take caution not to damage the new
ram seal when installing.
c) Dirt in the release valve will cause jack to
lower under load. Remove release valve, clean
valve seat replace valve.
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