Operators Manual
FLOOR JACK
9
Model 50156 - 4 Ton Capacity
• Safety
• Assembly
• Operation
• Maintenanc
• Parts
CAUTION: Before using this product, read
this manual and follow all its Safety Rules
and Operating instructions.
Sears, Roebuck and Co., Hoffman Estates, IL 60179
U.S. Patent:
5,755,099,5,946,912,6,199,379B1
Printed in China
rev 04/07
SAFETY INSTRUCTIONS
!
!
WARNING
WARNING
To avoid crushing and
• Study, understand, and follow all
instructions with and on this device
before operating this device.
• Do not exceed rated capacity.
• Use only on hard, level surface.
• This is a lifting device only. Immediately
after lifting, support the vehicle with
appropriately rated vehicle stands.
related injuries:
N E V E R w o r k o n ,
under or around a load
supported only by jack.
ALWAYSuseadequately
rated jack stands.
• Do not move or dolly the vehicle while
on the jack.
• Failure to heed product markings or
warnings may result in personal injury
or property damage.
! SAFETY MESSAGE !
Be sure all tools and personnel are clear
before lowering load. No alterations
shall be made to this product. Only
attachments and/or adapters supplied by
the manufacturer shall be used. Lift only
on areas of the vehicle as specified by the
vehicle manufacturer.
!
ADVERTENCIA
Leer, comprender, y seguir las instrucciones
antes de utilizar el aparato. El manual
de instrucciones y la informacion de
seguridad deben estar comunicado en
lengua del operador antes del uso. No
seguir estas indicaciones puede causar
danos personales o materiales.
NOTE: Jack stands are rated per pair
unless otherwise noted.
Use 1 matched pair per vehicle only.
ASSEMBLY
TO ASSEMBLE THE TWO PIECE
HANDLE
Spring Pin
Spring Pin Receiver
Upper Handle
•
Locate the spring pin on bottom end of upper
handle and the spring pin receiver on the
upper end of lower handle. (Fig. 1).
Lower Handle
FIG. 1
• Align the spring pin with the spring pin
receiver. Connect the two handle pieces
together by pressing the spring pin and
insert until the spring pin is locked in the
spring pin receiver.
1
Handle Socket
TO ASSEMBLE THE HANDLE INTO
THE SOCKET
2
1. Press and hold the handle socket to loosen
the lock pin (Fig. 2).
2. Pull out the lock pin, then release handle
socket slowly.
Lock Pin (to hold the
position of Handle
Socket in packaging)
FIG. 2
!
Caution: Handle socket is spring loaded.
Beware of pinching on fingers during
removal of lock pin.
Assembled
Handle
cket
3. Pull and hold the spring knob (Fig. 3).
4. Insert the assembled handle into the
socket, until it is firmly seated.
Spring Knob
5. Release spring knob to secure the handle
in position.
FIG. 3
3
OPERATION
KNOW YOUR JACK
BEFORE USE
• Read the operator’s manual completely
and familiarize yourself thoroughly with the
product, its components and recognize the
hazards associated with its use.
Compare Fig. 4 illustration with your jack
BEFORE operation to become familiar with
the location of various jack components.
• Occasionally during shipping and handling,
the hydraulic oil in jack may become
unstable or air may trapped in the system,
both of which can interfere with the jacks
lifting performance.
Jack Handle
• To stabilize the hydraulic oil, it is
recommended to cycle the jack a few times
without applying load:
• Close release valve by turning the jack
handle clockwise until tight.
• Pump the handle until the jack saddle
reaches its maximum height.
• Open release valve by turning jack
handle counter-clockwise, but no more
than 1/2 full turn at a time. Allow the
saddle to reach its lowest position.
• Repeat the above procedure a few
times.
• To release air from the hydraulic system:
(inside Handle
• Open the release valve by turning the
jack handle counterclockwise, but never
by more than 1/2 full turn at a time.
Socket, engage
Rear Castor
with Jack Handle)
FIG. 4
• Remove the oil filler screw from the
cylinder (Fig. 4).
• Rapidly pump jack handle through
several full strokes.
•
Reinstall the oil filler screw into the
cylinder again and jack is now ready to
use.
BEFORE EACH USE
SPECIFICATIONS
Make a visual inspection before each use
of the floor jack by checking for abnormal
conditions, such as cracked welds, leaks and
damaged, loose, or missing parts.
Rated Capacity: 4 Ton / 8000 Lbs
Jack Dimensions: 27-1/4” x 13-1/4” x 6-
7/16”
Lifting Range: 5-3/4” ~ 19-13/16” (Approx.)
(145 - 504 mm)
DAMAGE TO JACK
Oil Capacity: 235 c.c.
If you think jack has been subjected to an
abnormal load or shock, have it inspected for
damage at a Sears or other qualified service
center before using it again.
Net Weight: 89.1 Lbs (Approx.)
4
OPERATION
LOWERING THE JACK
OPERATING PRINCIPLES
• SLOWLY open the release valve by
turning the handle counterclockwise,
but never more than 1/2 full turn at a
time.
• 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.)
• Whentheramreachesmaximumextension,
oil is bypassed back into the reservoir to
prevent an over-extended ram stroke and
possible damage to the jack.
!
Warning: Rated capacity of jack stands
is per 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.
• 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.
LOWERING THE JACK
!
Warning: To avoid crushing injuries and
property damage: Keep hands and feet clear
of work area when lowering load.
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.
• 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:
HOW TO USE YOUR JACK
RAISING THE JACK
• 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.
• 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.
5
MAINTENANCE
MAINTAINING OIL LEVEL
ANNUAL INSPECTION
Important: When adding or replacing oil,
ALWAYS use a good grade Hydraulic Jack oil.
DO NOT use Hydraulic Brake Fluid, Alcohol,
Glycerine, Detergent, Motor Oil or dirty oil.
Use of an improper fluid can cause serious
internal damage to your jack. We recommend
Mobil DTE13M or equivalent.
To ensure that it is in optimum condition,
annual inspection of the jack at a Sears
Service Center is recommended.
REPLACING OIL
• To drain oil, remove oil filler screw and open
release valve. Turn jack over and drain old
oil out through the oil filler hole.
Note: Dispose of hydraulic oil in accordance
with local regulations.
• Refill with new oil through the oil filler hole.
DO NOT allow dirt or foreign material to
enter the hydraulic system when filling.
• After refilling, remove any air from the
hydraulic system by opening the release
valve and rapidly pumping the jack handle
several times.
ADDING OIL
• Position the jack on level ground and fully
lower the saddle. (Ram will be all the way
in). Remove oil filler plug from the reservoir
(see Fig. 4 & 5).
• Oil should be filled to the level of about
3/16” above the inner cylinder as seen
from the oil filler hole. If low, add oil as
needed.
• Re-install oil filler plug. The jack is now
ready to use.
• Re-install oil filler screw and the jack is
ready to use.
LUBRICATION
• Add lubricating oil to all moving parts as
needed.
PREVENTING RUST
• Check ram and pump plunger (Fig. 5)
every few months for any signs of rust or
corrosion. Clean as needed by wiping with
an oily cloth.
• When not in use, ALWAYS store jack with
saddle lowered all the way down.
FIG. 5
6
TROUBLESHOOTING
PROBLEM-SOLVING HINTS
Symptom
Possible Causes
Corrective Action
• Ensure release valve is tightly closed
• Overloaded - too much weight on jack • Reduce weight on jack
• Release valve not tightly closed • Ensure release valve is tightly closed
Jack will not lift load
• Release valve not tightly closed
Jack bleeds off
(starts to lower) after lift • Hydraulic unit malfunction
• Replace power unit assembly
Jack will not lower after • Oil reservoir overfilled
• Drain fluid to proper level
unloading
• Linkages binding
• Clean and lubricate moving parts
Poor lift performance
• Fluid level low
• Ensure proper fluid level
• Air trapped in system
• With ram fully retracted, open
release valve and remove oil filler
screw, pump handle several times to
expel trapped air. Re-install oil filler
screw.
Will not lift to full
extension
• Fluid level low
• Ensure proper fluid level
PARTS
MODEL NUMBER: 50156
Not all components of the jack are replacement items, but are illustrated as a convenient
reference of location and position in the assembly sequence. When ordering parts, give
Model number, Serial Number and parts description. The Model Number and Serial Number
are found on the lifting arm and handle socket respectively.
Key Description
1
2
3
4
5
6
7
8
Saddle Assembly
Power Unit Assembly
Handle Assembly
Front Wheel Assembly
Handle Socket Assembly
Rear Castor Assembly
Tool Tray
3
5
Oil Filler Screw
-- Operators Manual
-- Warning Label
6
FIG. 6
For after sale support and assistance:
Call 8:00 AM - 4:45 PM CST., Monday - Friday 1-888-332-6419
7
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or maintenance agreement (Canada) on a product serviced by Sears:
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