Craftsman 50284 User manual

Operator’s Manual
Model 50284 - 12 Ton Capacity
Model 50285 - 20 Ton Capacity
CUSTOMER HELP LINE
Parts and Questions
1-888-332-6419
8:00 AM - 4:45 PM Central Time
Monday- Friday
WARNING: Before using this product,
read this Operator’s Manual and follow
all its Safety Rules and Operating
Instructions.
Sears Brands Management Corporation, Ho󰀨man Estates, IL 60179 U.S.A.
www.craftsman.com
• Safety
• Operation
• Assembly
• Maintenance
• Parts
Printed in China
Hydraulic Bottle Jacks
U.S. Patent: 5,946,912

2
AIR PURGE PROCEDURE
Release
Valve
Cylinder
Saddle
Oil ll plug
(not shown)
Handle
Socket
Handle
NOTE: Repeat this
Air Purge Procedure
whenever the jack
displays reduced
lifting performance.
CUSTOMER HELP LINE
Parts and Questions
1-888-332-6419
8:00 AM - 4:45 PM Central Time
Monday- Friday
NOTE: Repeat this Air Purge Procedure
whenever the jack displays reduced lifting
performance.
IMPORTANT: BEFORE FIRST USE, perform the following Air Purge Procedure to remove any air that may
have been introduced into the hydraulic system as a result of product shipment and handling.
CLOSE RELEASE VALVE
Remove handle from handle socket. Place
handle back onto release valve. Fully close
release valve by turning handle clockwise
until it stops.
READY FOR USE
Remove handle from release valve. Insert
handle into handle socket. Jack is now
ready to use. Check for proper pump action.
OPEN RELEASE VALVE
Place the open end of the handle over
the release valve so that the notches
in the handle align with the protrusions
on the release valve. Turn the handle
counterclockwise 2 full turns to fully open
release valve.
RAPIDLY PUMP
Remove handle from release valve. Insert
handle into handle socket. Turn handle
slightly to right to engage pin in slot. Rapidly
pump the handle 6 - 8 times. Leave handle
in down position.
1
2
4
5
PURGE AIR
With a at blade screwdriver, push the oil ll
plug slightly to the side to purge trapped air
from system. You should hear a hiss.
3

3
SAFETY INSTRUCTIONS CRAFTSMAN LIMITED WARRANTY
DESCRIPTION
Read Operating Instructions
Study, understand and follow all instructions
in this manual before operating the jack.
Failure to heed these warnings may result in
loss of load, damage to the jack and/or jack
failure resulting in personal injury or property
damage.
Position the Jack
This jack is designed only for lifting part of
the total vehicle. Position the jack to only lift
on the areas of the vehicle specied by the
vehicle manufacturer.
Use Support Stands
After lifting the vehicle always support the
load with appropriately rated vehicle support
stands before working on the vehicle.
Do Not Overload Jack
Do not overload this jack beyond its rated
capacity. Overloading this jack beyond its
rated capacity can cause damage to or failure
of the jack.
Use on Hard Level Surface
This jack is designed only for use on hard
level surfaces capable of sustaining the load.
Use on other than hard level surfaces can
result in jack instability and possible loss of
load.
Center Load on Jack Saddle
Center load on jack saddle before lifting
vehicle. O󰀨-center loads and loads lifted
when the jack is not level can cause loss
of load or damage to the jack. Only use on
vehicles whose lift points t well with saddle
of this jack.
Do Not Use Jack as Dolly
Do not move or dolly the vehicle while it is on
the jack. Do not use this jack to lift or move a
building, mobile home or travel trailer of any
type.
KEEP HANDS AND FEET CLEAR OF THE
JACK HINGE MECHANISM AND GROUND
CONTACT AREA WHEN LOWERING THE
LOAD!
CRAFTSMAN LIMITED WARRANTY
FOR ONE YEAR from the date of sale this
product is warranty against defects in material
or workmanship. WITH PROOF OF SALE
a defective product will be replaced free of
charge.
For warranty coverage details to obtain
free replacement, visit the web page: www.
craftsman.com/warranty
This warranty applies for only 90 days from
the date of sale if this product is ever used
while providing commercial services or if
rented to another person.
This warranty gives you specic legal rights,
and you may also have other rights which vary
from state to state.
Sears Brands Management Corporation,
Ho󰀨man Estates, IL 60179
Craftsman model 50284 features a 24,000 lbs.
maximum capacity. Lifting range for this jack is
9-7/16 inches to 18-5/8 inches. Model 50285
features a 40,000 lbs. maximum capacity.
Lifting range for this jack is 9-1/2 inches to
18-11/16 inches.
Specications
50284 Maximum load capacity..12 tons (24,000 lbs.)
50284 Lift range...........9-7/16 to 18-5/8 inches
50284 Weight......................................16.9 lbs.
50285 Maximum load capacity..20 tons (40,000 lbs.)
50285 Lift range..........9-1/2 to 18-11/16 inches
50285 Weight .....................................24.2 lbs.
WARNING: This product contains chemicals
known to the state of California to cause
cancer and birth defects or other reproductive
harm. www.P65Warnings.ca.gov
THIS IS A LIFTING DEVICE ONLY!
DO NOT work on vehicle supported by jack.
Immediately after lifting, support load with
appropriately rated vehicle support stands before
working on vehicle.

4
Spring lock
PICTURE 1
PICTURE 2
ASSEMBLY
FEATURES & OPERATION
Assembly
Handle Assembly
• Assemble the handle sections by lining
up the spring detent in the grip section
with the slot in the other section (Picture
1 & 2).
NOTICE: ONLY use the handle provided
with this jack. Handle is specially designed
to properly t into handle socket and engage
release valve.
Operation
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.
• Close the release valve by turning the
handle clockwise until it stops.
• Pump jack handle until saddle nears contact
with vehicle lifting point. Check to see that
the saddle is centered and will contact lifting
point rmly.
• Continue to pump jack 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.
• Carefully open the release valve by slowly
turning the handle counterclockwise.
• After removing jack from under vehicle, if
saddle has not fully descended, push it all
the way down to reduce ram exposure to
rust and contamination.
PREPARATION
Compare these illustrations with your jack
BEFORE operation and/or oil level maintenance
to become familiar with the location of various
jack components (Picture 3).
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 an
overload valve 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 4,000
lbs) to protect the jack from damage and the
user from possible serious injury.
Jack
2-piece handle

5
MAINTENANCE
Maintenance
To Add Oil:
• Position jack on the level ground and lower
the saddle.
• Remove the oil ll plug.
• 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 plug. 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 plug.
• 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.
Rust Prevention:
• Check ram and pump plunger on the Power
Unit Assembly every two months (or sooner,
based on usage) for any signs of rust or
corrosion. Lift the jack as high as it goes
and look under and behind the lifting arm. If
signs of rust are visible clean as needed and
wipe down with with an oily cloth or cloth
sprayed with WD-40.
• When storing the jack, always have the
saddle and pump plunger in the down
postion.
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 UN-
RECOMMENDED FLUID CAN CAUSE
DAMAGE TO YOUR JACK.
Storage:
Depress the spring lock to separate the
handle pieces.
Air Purge Procedure
During shipment, air may get into the
hydraulic system causing reduced lifting
performance. Perform Air Purge Procedure
described on page 2.
• 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.

6
REPLACEMENT PARTS LIST
TROUBLESHOOTING
Symptom
Jack will
not lift
load
Jack will
not hold
load
Jack will
not lift to
full height
Jack will
not lower
completely
Poor jack
lifting,
pump
feels
spongy
Handle
raises by
itself while
under load
X X X X Oil level is low in jack. Add oil
as required.
Probable Cause and Solution
X X X X X Power unit may have trapped
air. Release air from system.
X X X Release valve may not be
closing properly. Turn the
release valve clockwise tightly.
XOil reservoir is over-lled.
Drain out some oil.
XLubrication of moving parts is
necessary.
X X X Power unit is malfunctioning.
Replace the power unit.
#Description Qty.
1 Handle 1
2Oil ll plug 1
- Owner’s Manual 1
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19
序号 名称 数量
顶帽
矩形密封圈
外套
油塞
梯形密封圈
活塞杆组合
碗型垫
油缸
密封圈
钢球压板
钢球S6
防尘管
泵芯
挡圈
泵体
垫片
揿手连杆组合
开口销
销轴
手柄
回油阀杆
底座
钢球S3
顶块
安全阀弹簧
调压螺钉
O型密封圈
油堵
O型密封圈
O型密封圈
O型密封圈
O型密封圈

7
NOTE

8
For Help Line, Parts and Service:
Call 8:00 am - 4:45 pm, CT, Monday - Friday
1-888-332-6419
Para la linea de ayuda, partes y servicio:
Llame de 8:00 am - 4:45 pm, CT, Lunes-Viernes
1-888-332-6419