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Operating Instructions and Parts Manual
2-1/4 Ton Short Chassis Service Jack
Model JSJ-2-1/4XA
JET
427 New Sanford Road
LaVergne, Tennessee 37086
Part No. M-454226
Ph.: 800-274-6848
Revision A1 05/2014
Copyright © 2014 JET
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2.0 Table of contents
Section
Page
1.0 Warranty and Service.....................................................................................................................................2
2.0 Table of contents............................................................................................................................................3
3.0 Safety warnings..............................................................................................................................................4
4.0 About this manual ..........................................................................................................................................4
5.0 Specifications.................................................................................................................................................5
6.0 Assembly........................................................................................................................................................6
7.0 Lubrication......................................................................................................................................................6
8.0 Operating instructions ....................................................................................................................................6
8.1 Raising the jack..........................................................................................................................................6
8.2 Lowering the jack .......................................................................................................................................6
9.0 Maintenance...................................................................................................................................................6
10.0 Troubleshooting the JSJ-2-1/4XA Service Jack...........................................................................................7
11.0 Replacement Parts.......................................................................................................................................7
11.1.1 Main Body Assembly (2-1/4T Short Chassis Service Jack) – Exploded View.......................................8
11.1.2 Main Body Assembly (2-1/4T Short Chassis Service Jack) – Parts List ...............................................9
11.2.1 Power Unit Assembly (2-1/4T Short Chassis Service Jack) – Exploded View....................................10
11.2.2 Power Unit Assembly (2-1/4T Short Chassis Service Jack) – Parts List.............................................11
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3.0 Safety warnings
1. Read and understand the entire owner's manual before attempting assembly or operation.
2. Read and understand the warnings posted on the jack and in this manual. Failure to comply with all of
these warnings may cause serious injury.
3. Replace warning labels if they become obscured or removed.
4. This is a lifting device only. Do not move or dolly the vehicle while on the jack. The load shall be supported
immediately by jack stands, or other appropriate means.
5. Inspect jack before each use. Do not use jack if it is damaged, has been altered or parts have loosened.
6. Do not exceed rated lift capacity. Overloading can cause damage to, or failure of, the jack.
7. Always center load on saddle.
8. Do not introduce blocks or other items between load and jack saddle.
9. Lift only on areas of the vehicle specified by the vehicle manufacturer.
10. This jack is designed 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.
11. Clear obstructions from around jack area, such as tools, gravel, etc., before lifting.
12. Do not get under vehicle while jack is being used as the only support.
the location of your nearest JET Authorized Service Center.
14. Jack service must be performed by qualified personnel only. Use only genuine JET factory replacement
parts; use of unauthorized parts may cause risk of injury, and may void warranties.
15. Use only approved hydraulic fluid (ISO 32 hydraulic oil, or “jack oil”). Use of other fluids, such as brake fluid
or transmission oil, can damage seals and cause possible jack failure.
16. Do not modify the jack.
17. Failure to comply with all of these warnings may result in loss of load, damage to jack, and/or failure
resulting in personal injury or property damage.
4.0 About this manual
This manual is provided by JET covering the safe operation and maintenance procedures for a JET Model JSJ-
2-1/4XA Short Chassis Service Jack. This manual contains instructions on installation, safety precautions,
general operating procedures, maintenance instructions and parts breakdown. Your jack has been designed
and constructed to provide years of trouble-free operation if used in accordance with the instructions as set
forth in this document.
If there are questions or comments, please contact your local supplier or JET. JET can also be reached at our
Retain this manual for future reference. If the jack transfers ownership, the manual should accompany it.
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5.0 Specifications
Model number .....................................................................................................................................JSJ-2-1/4XA
Stock number..............................................................................................................................................454226
Rated Capacity.........................................................................................................................................2-1/4 Ton
Strokes to reach maximum height without load .............................................................................................2 to 3
Regulating pressure .................................................................................................................................73.5 MPa
Maximum Height – A ...................................................................................................................... 18.7” (475mm)
Minimum Height – B.......................................................................................................................... 5.3” (135mm)
Saddle Diameter – D............................................................................................................................ 4” (100mm)
Overall Length – C .......................................................................................................................... 26.5” (672mm)
Overall Width – E ............................................................................................................................ 13.4” (340mm)
Handle Length (two pieces) – F .................................................................................................... 39.4” (1000mm)
Net Weight .....................................................................................................................................71.6 lb (32.5kg)
Shipping Weight ...................................................................................................................................75 lb (34kg)
Figure 1
The specifications in this manual were current at time of publication, but because of our policy of continuous
improvement, JET reserves the right to change specifications at any time and without prior notice, without incurring
obligations.
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8.0 Operating instructions
6.0 Assembly
Important: During shipment and handling, air
sometimes gets into the hydraulic system causing
poor lifting performance. Before initial operation,
purge any air from system by fully opening pump
release valve (turn handle counter-clockwise).
Then, while holding saddle down, pump handle
rapidly several times.
Numbers in parenthesis (#) refer to parts
breakdown, page 6:
1. Insert Upper Handle (30) into Lower Handle
(29) and fasten with Hex Cap Bolt (28).
2. Remove Handle Bolt (25).
3. Insert handle assembly into Handle Socket
(23). Make sure handle assembly engages
Gear Shaft (27) by turning handle back and
forth and observing movement of Handle
Socket Gear (26).
8.1 Raising the jack
1. Close release valve by turning handle
clockwise until resistance is felt. Do not over
tighten.
4. Install Handle Bolt (25) to secure handle
assembly.
2. Place jack directly under object to be lifted,
and pump handle to raise saddle to contact
point. Make sure saddle accepts weight firmly
and centrally.
7.0 Lubrication
3. Check positioning under slight load to confirm
jack or load will not slip, or move suddenly.
Note:
Lubricate before initial operation, and
periodically to ensure smooth operation. Lubricate
jack at points 1 through 6, as indicated in Figure 1.
4. Raise jack by pumping handle until desired
height is reached.
5. After lifting, secure and transfer load to jack
stands or other appropriate means. Do not
use jack as the only means of support.
8.2 Lowering the jack
Slowly turn handle counter-clockwise. Speed of
descent is controlled by amount release valve is
turned.
9.0 Maintenance
Store jack in a safe and dry environment, away
from children or unauthorized personnel. Always
store jack in fully lowered position, with handle in
upright position.
Figure 1 – Lubrication points
Keep jack clean and properly lubricated.
1. Handle: Use #2 tube grease on release valve
gears below handle and lightly grease handle
at point where it fits into socket.
2. Wheels: Use 30W oil on axles and caster
bearings.
3. Lifting Arm: Inject #2 tube grease into grease
fitting.
4. Saddle and linkage: Use 30W oil on all moving
and pivoting parts.
5. Handle socket pivot bolts: Lubricate with 30W
oil.
6. Plunger and plunger pin: Use #2 tube grease
to lubricate connection between pump plunger
and pin in handle socket.
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10.0 Troubleshooting the JSJ-2-1/4XA Service Jack
Symptom
Possible Cause
Correction
Jack fails to lift load, or
only partially lifts.
Release valve open.
Weight capacity exceeded.
Close valve by rotating handle clockwise.
Use other lifting equipment; load must not
exceed rated capacity of jack.
Low hydraulic fluid.
Low hydraulic fluid.
Release valve open.
With jack on level ground, lower saddle
completely. Remove fill plug and check oil
level. Fill as needed with approved
hydraulic fluid. Reinstall fill plug.
Jack fails to rise to
height limit.
With jack on level ground, lower saddle
completely. Remove fill plug and check oil
level. Fill as needed with approved
hydraulic fluid. Reinstall fill plug.
Jack fails to hold load
in raised position.
Close valve by rotating handle clockwise.
Jack oil leaks
Reservoir overfilled.
Seals are worn.
Drain some oil from reservoir.
Have seals replaced by authorized service
center.
Handle won’t pump full
stroke.
Air in system.
Bleed air from system by opening release
valve and pumping handle several times.
11.0 Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-
Model Number and Serial Number of your machine available when you call will allow us to serve you quickly
and accurately.
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11.1.1 Main Body Assembly (2-1/4T Short Chassis Service Jack) – Exploded View
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11.1.2 Main Body Assembly (2-1/4T Short Chassis Service Jack) – Parts List
Index No Part No
Description
Size
Qty
1 ................JSJ21/4XA-01........... Front Caster............................................................. ......................................2
2 ................JSJ3XA-02................ Washer .................................................................... 18mm............................2
3 ................JSJ3XA-03................ C-Clip....................................................................... 18mm............................2
4 ................JSJ3S-07................... Swivel Caster Assembly .......................................... ......................................2
5 ................JSJ3S-08................... Ball Ring .................................................................. ......................................2
6 ................JSJ3S-09................... Steel Ball.................................................................. 6.35mm.......................38
7 ................JSJ3S-10................... Ball Cover ................................................................ ......................................2
8 ................JSJ3S-05................... Lock Washer............................................................ 16mm............................2
9 ................JSJ3S-06................... Hex Nut.................................................................... M16...............................2
10 ..............JSJ21/4XA-10........... Arm Shaft................................................................. ......................................1
11 ..............JSJ3S-14................... C-Clip....................................................................... 25mm............................4
12 ..............JSJ3S-11................... Lock Washer............................................................ 12mm............................4
13 ..............JSJ3S-12................... Screw....................................................................... M12x25 .........................2
14 ..............JSJ3S-18................... Hex Nut.................................................................... M12...............................2
15 ..............JSJ21/4XA-15........... Shaft ........................................................................ ......................................2
16 ..............JSJ3S-16................... Washer .................................................................... 10mm............................5
17 ..............JSJ21/4XA-17........... Lock Nut................................................................... M10...............................4
18 ..............JSJ3S-19................... Bolt........................................................................... M18...............................1
19 ..............JSJ3S-20................... Lock Washer............................................................ 18mm............................2
20 ..............JSJ3S-26................... Torsion Spring ......................................................... ......................................1
21 ..............JSJ3S-21................... Pin............................................................................ 2x16mm........................1
22 ..............JSJ3S-22................... Washer .................................................................... 8mm..............................4
23 ..............JSJ3S-27................... Handle Socket ......................................................... ......................................1
24 ..............JSJ3S-24................... Pin............................................................................ ......................................1
25 ..............JSJ3S-25................... Bolt........................................................................... ......................................1
26 ..............JSJ3S-23................... Release Valve Gear................................................. ......................................1
27 ..............JSJ3S-29................... Screw....................................................................... ......................................1
28 ..............JSJ3S-31................... Bolt........................................................................... M6x35 ...........................1
29 ..............JSJ3S-32................... Lower Handle........................................................... ......................................1
30 ..............JSJ3S-34................... Upper Handle........................................................... ......................................1
31 ..............JSJ3S-33................... Handle Grip.............................................................. ......................................1
32 ..............JSJ21/4XA-32........... Power Unit Assembly............................................... ......................................1
33 ..............JSJ3XA-33................ Gear......................................................................... ......................................1
34 ..............JSJ3XA-34................ Washer .................................................................... 8mm..............................1
35 ..............JSJ3XA-35................ Nut ........................................................................... M8.................................1
36 ..............JSJ3S-42................... Return Spring........................................................... ......................................1
37 ..............JSJ3S-41................... Pin............................................................................ 4x50mm........................1
38 ..............JSJ21/4XA-38........... Connecting Bar........................................................ ......................................1
39 ..............JSJ3XA-39................ Screw....................................................................... ......................................1
40 ..............JSJ3S-39................... Grease Fitting .......................................................... M6.................................1
41 ..............JSJ21/4XA-41........... Lifting Arm Assembly............................................... ......................................1
42 ..............JSJ21/4XA-42........... Saddle...................................................................... ......................................1
43 ..............JSJ21/4XA-43........... Bolt........................................................................... ......................................3
44 ..............JSJ21/4XA-44........... Side Plate Assembly................................................ ......................................1
45 ..............JSJ3S-15................... Hex Nut.................................................................... M10...............................1
..................JSJ21/4XA-WL.......... I.D./Warning Label (not shown) ............................... ......................................1
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11.2.1 Power Unit Assembly (2-1/4T Short Chassis Service Jack) – Exploded View
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11.2.2 Power Unit Assembly (2-1/4T Short Chassis Service Jack) – Parts List
Index No Part No
Description
Size
Qty
..................JSJ21/4XA-32........... Power Unit Assembly (includes 32-1 thru 32-45) .... ......................................1
32-1...........JSJ21/4XA-321......... Cylinder Cover......................................................... ......................................1
32-2...........JSJ21/4XA-322......... O-Ring *................................................................... ......................................1
32-3...........JSJ21/4XA-323......... Seal Ring *............................................................... ......................................1
32-4...........JSJ21/4XA-324......... Oil Tank ................................................................... ......................................1
32-5...........JSJ21/4X-57.............. Oil Fill Plug * ............................................................ ......................................1
32-6...........JSJ21/4X-54.............. O-Ring *................................................................... ......................................1
32-7...........JSJ21/4XA-327......... Ram......................................................................... ......................................1
32-8...........JSJ21/4XA-328......... Retainer *................................................................. ......................................1
32-9...........JSJ21/4XA-329......... Piston Ring .............................................................. ......................................1
32-10.........JSJ21/4XA-3210....... Washer *.................................................................. ......................................1
32-11.........JSJ21/4XA-3211....... O-Ring *................................................................... ......................................1
32-12.........JSJ21/4XA-3212....... Pin............................................................................ ......................................1
32-13.........JSJ21/4XA-3213....... Spring ...................................................................... ......................................1
32-14.........JSJ21/4XA-3214....... Ram Rod.................................................................. ......................................1
32-15.........SB-4MM.................... Steel Ball.................................................................. 4mm..............................2
32-16.........JSJ21/4XA-3216....... Spring ...................................................................... ......................................1
32-17.........JSJ21/4XA-3217....... Screw....................................................................... ......................................1
32-18.........JSJ21/4XA-3218....... O-Ring *................................................................... ......................................2
32-19.........JSJ21/4XA-3219....... Retainer *................................................................. ......................................1
32-20.........JSJ21/4XA-3220....... Ram......................................................................... ......................................1
32-21.........JSJ21/4XA-3221....... Seal Ring *............................................................... ......................................1
32-22.........JSJ21/4XA-3222....... Cylinder.................................................................... ......................................1
32-23.........JSJ21/4X-88.............. Back Up Ring * ........................................................ Ø50.2 x ø47 x 1.6 .........1
32-24.........JSJ21/4X-89.............. O-Ring *................................................................... Ø46.5 x ø2.4 .................1
32-25.........JSJ21/4X-100............ Filter......................................................................... ......................................2
32-26.........JSJ21/4XA-3226....... Screw....................................................................... M8x16 ...........................3
32-27.........SB-6MM.................... Steel Ball.................................................................. 6mm..............................4
32-28.........JSJ21/4X-83.............. O-Ring *................................................................... Ø14 x ø2.65 ..................2
32-29.........JSJ21/4XA-72........... Back Up Ring * ........................................................ Ø18 x ø14 x 1.5 ............2
32-30.........JSJ21/4X-75.............. Piston Pump ............................................................ Ø14...............................1
32-31.........JSJ21/4X-80.............. Adaptor.................................................................... ......................................1
32-32.........JSJ21/4X-81.............. Spring ...................................................................... ......................................1
32-33.........JSJ21/4X-69.............. Adjustment Screw.................................................... ......................................1
32-34.........JSJ21/4XA-3234....... O-Ring *................................................................... ......................................1
32-35.........JSJ21/4XA-3235....... Screw....................................................................... ......................................1
32-36.........JSJ21/4XA-3236....... Pin............................................................................ 4x16 ..............................1
32-37.........JSJ21/4XA-3237....... O-Ring *................................................................... 12.5 x 1.8......................1
32-38.........JSJ21/4XA-3238....... Release Valve Rod.................................................. ......................................1
32-39.........JSJ21/4XA-3239....... Pin............................................................................ 4x30 mm.......................1
32-40.........JSJ21/4XA-3240....... Steel Ball.................................................................. 5.5mm...........................2
32-41.........SB-8MM.................... Steel Ball.................................................................. 8mm..............................2
32-42.........JSJ21/4XA-3242....... Square Block ........................................................... ......................................2
32-43.........SB-10MM.................. Steel Ball.................................................................. 10mm............................2
32-44.........JSJ21/4XA-3244....... Screw....................................................................... M12x16x3 .....................2
32-45.........JSJ21/4XA-3245....... Valve Assembly....................................................... ......................................1
..................JSJ21/4XA-SK .......... Seal Kit (contains items with asterisk * ).................. ........................................
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427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
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