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Operating Principles - Craftsman 950156 Operator's Manual

Floor jack 4 ton capacity
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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 a 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
if 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.
Note:
The release
valve
must be closed
for the handle
to remain
upright.
When
the
release
valve
is opened,
the handle
may
lower to the floor.
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 (Fig. 4).
• Refer to the vehicle manufacturer's
owner's
manual to locate approved
lifting points on
the vehicle. Position jack so that the saddle
(Fig. 4) 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, immediately
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,
but never
more
than
1/2 full turn
at a
time.
,_Warning:
Rated capacity of jack stands
is pet pair, it is NOT the sum of individual
capacities
unless specifically
noted to the
contrary
by the jack stand manufacturer.
Do Not exceed
rated capacity.
Ensure
that the vehicle
support
points are fully
captured
between
the outer lugs of both
jack stands.
Use a matched
pair of jack
stands
per vehicle
to support
one end
only.
Use 1 pair per vehicle only. Failure
to do so may result in sudden loss of load,
which
may cause personal
injury and/or
property
damage.
LOWERING
THE JACK
,_Warning:
To avoid crushing
injuries and
property damage:
Keep hands and feet clear
of work area when lowering
load.
* Raise load high enough
to clear the jack
stands, then carefully
remove jack stands
(always
used in pairs).
SLOWLY open the release valve by turning
the handle
counterclockwise,
but never
more than 1/2 full turn. If the load fails to
lower:
* Use another jack to raise the vehicle high
enough
to reinstall jack stands.
* Remove
the affected jack and then the
stands
* Using the other jack, lower the load by
turning
the operating
handle
counter-
clockwise,
but no more
than
1/2 full
turn.
* After
removing
jack
from
under
the
load,push
saddle
down
to reduce
ram
exposure
to rust and contamination.

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