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Operating Principles - Craftsman 50239 Operator's Manual

2 ton capacity floor jack
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KNOW YOUR JACK
Compare
Fig. 3 illustration
with your jack
BEFORE operation
to become familiar with
the location of various jack components.
Jack Handle
Handle Socket
Magnetic Tool Tray
remove to access Air Vent Valve)
Saddle Pad
Air Vent Valve (located
_addie
beneath Tool Tray)
Lifting Arm
-'ront Roller °
Rear Handle
Release Value
(inside Handle
Socket, engage
with Jack
Handle)
Rear Castor
Side Handle
FIG. 3
OPERATING
PRINCIPLES
• 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 cylinder, which
forces the ram out. This raises the
saddle. (NOTE: To avoid damage
to the
cylinder it the load exceeds the rated
capacity of the jack, oil is automatically
released back into the reservoir through
the safety overload
valve.)
When the ram reaches maximum
extension, oil is bypassed
back into the
reservoir to prevent an over-extended
ram stroke and possible damage to the
jack.
Opening the release valve allows oil to
flow back into the reservoir. This releases
hydraulic pressure on the ram, which
results in lowering
the saddle.
HOW TO USE YOUR JACK
RAISING THE JACK
• Chock the vehicle wheels with
appropriate
devices to prevent vehicle
from moving and to ensure lifting stability.
Close the release valve by turning the
jack handle clockwise
until tight. (see Fig.
3)
• Refer to the vehicle manufacturer's
owner's manual to locate approved
lifting
points on the vehicle. Position jack so
that the saddle (see Fig. 3) is centered
under the load at an appropriate
lift point.
• Pump jack handle until saddle ALMOST
contacts the vehicle. Check to see that
the saddle is centered and will contact
the load lifting point firmly.
• Continue to pump the jack handle to lift
the vehicle to the desired height. After
lifting, support the load with appropriately
rated vehicle support stands BEFORE
working on the vehicle.
LOWERING
THE JACK
• SLOWLY open the release valve by
turning the handle counterclockwise.
Never more than 1/2 turns.
CAUTION:
Keep hands and feet clear of
the jack hinge mechanism
and ground
contact area when lowering
the load!
SPECIFICATIONS
Rated Capacity: 2 Ton/4000
Lb
Jack Dimensions:
27-3/4" x 12-1/8" x 6-1/4"
Lifting Range: 3-3/4" - 18-1/2" (Approx.)
Oil Capacity:
150 c.c.
Net Weight: 42.5 Ibs. (Approx.)
4

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