Craftsman 48112 - Features and Operation; Raising the Jack; Lowering the Jack; How it Works

4
FEATURES & OPERATION
NOTICE: ONLY use the handle provided
with this jack. Handle is specially designed
to properly t into handle socket and engage
release valve.
Raising the Jack
• Place vehicle in park, with emergency brake
on and wheels securely chocked to ensure
lifting stability.
• Refer to the vehicle manufacturer owner’s
manual to locate the approved vehicle lifting
points.
• Position the jack so that the saddle will rmly
contact the vehicle lifting point.
• Place the open end of the handle over the
release valve so that the narrow crosspiece
in the handle tip engages into the slot in the
valve. Close the release valve by turning the
handle clockwise until it stops.
• Remove handle from release valve. Insert
handle into handle socket. Turn handle
slightly to right to engage pin in socket slot.
• Pump handle until lift arm saddle nears
contact with vehicle lifting point. Check to
see that saddle is centered and will contact
lifting point rmly.
• Continue to pump handle to lift vehicle to
desired height.
• After lifting, support the load with
appropriately rated vehicle support stands
before working on vehicle.
WARNING: Never work on, under, or
around a load supported only by a
hydraulic jack.
Lowering the Jack
• Raise load high enough to clear jack stands;
then carefully remove the stands.
• Remove the handle from the handle socket.
Place end of handle over release valve,
ensuring that metal crosspiece inserts into
slot of valve.
• Carefully open the release valve by slowly
turning the handle counterclockwise. , but no
more than 1/2 full turn. Lift arm will lower.
• After removing jack from vehicle, if saddle
has not fully descended, push it all the
way down to reduce lift arm and power unit
exposure to rust and contamination.
How it works
With Release Valve Closed
• An upward stroke of the jack Handle draws
oil from the reservoir tank into the plunger
cavity. Hydraulic pressure holds the valve
closed, which keeps the oil in the plunger
cavity.
• A downward stroke of the jack Handle
releases oil into the lift cylinder, which forces
the power unit ram out. This raises the
saddle.
• When the ram reaches maximum extension,
oil bypasses the lift cylinder through a
patended system back into the oil reservoir,
protecting the jack from damage. This
bypass system also goes into e󰀨ect when
the jack is overloaded (load exceeds 5,000
lbs) to protect the jack from damage and the
user from possible serious injury.
• Opening the release valve allows oil to
ow back into the reservoir. This releases
hydraulic pressure on the ram, which results
in lowering the saddle.
Maintenance
To Add Oil:
• Position jack on the level ground and lower
the saddle.
• Remove the oil ll screw.
• Fill the oil reservoir until oil level is just over
the top surface of the inner cylinder. Replace
oil plug.
• Perform Air Purge Procedure described on
page 2.
To Replace Oil:
• Fully open release valve by turning handle
counterclockwise as far as it will go.
• Remove the oil ll screw. Turn the jack over
so that old oil will drain from the oil ll hole.
• Turn the jack back over after the oil has
drained. Rell through oil ll hole. Keep dirt
and other material clear when pouring. Fill
to just beneath lower rim of hole. Replace oil
ll screw.
• Perform Air Purge Procedure described on
page 2.
Lubrication
• Add lubricating oil (WD-40) to all moving
parts when needed.
• For light duty use, lubricate every six
months.
• For heavy and constant use, lubrication is
recommended every month.
MAINTENANCE