TRANSMISSION JACK
ONE TON
37481
ASSEMBLY and OPERATING
INSTRUCTIONS
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyright © 1997 by Harbor FreightTools®. All rights reserved. No portion of
this manual or any artwork contained herein may be reproduced in any shape
or form without the express written consent of Harbor Freight Tools.
For technical questions and replacement parts, please call 1-800-444-3353
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6. Avoid moving parts on the jack. Keep fingers, hands, and arms away from moving
parts of the jack at all times.
7. Secure load. Secure the load with a safety chain before lowering or moving.
8. Use jack on hard surfaces only. The jack is designed for use only on hard, level
surfaces capable of sustaining the load. Using the jack on a soft surface can result in
jack instability and possible loss of load.
9. Keep children away. Children must never be allowed in the work area. Do not let
them handle machines, tools, or extension cords.
10. Store idle equipment. When not in use, tools must be stored in a dry location to inhibit
rust. Always lock up tools and keep out of reach of children.
11. Do not force tool. It will do the job better and more safely at the rate for which it was
intended. Do not use inappropriate attachments in an attempt to exceed the tool
capacity.
12. Use the right tool for the job. The use of this jack is limited to the removal,
installation, and transportation (in the lowered position), of transmissions and
differentials.
13. Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically nonconductive clothes and nonskid footwear are
recommended when working. Wear restrictive hair covering to contain long hair.
14. Use eye and ear protection. Always wear ANSI approved impact safety goggles.
Wear a full face shield if you are producing metal filings or wood chips. Wear an ANSI
approved dust mask or respirator when working around metal, wood, and chemical
dusts and mists.
15. Do not overreach. Keep proper footing and balance at all times. Do not reach over or
across running machines.
16. Maintain tools with care. Keep tools sharp and clean for better and safer
performance. Follow instructions for lubricating and changing accessories. Inspect tool
cords periodically and, if damaged, have them repaired by an authorized technician.
The handles must be kept clean, dry, and free from oil and grease at all times.
17. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches
are removed from the tool or machine work surface before plugging it in.
18. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
19. Check for damaged parts. Before using any tool, any part that appears damaged
should be carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment and binding of moving parts; any broken parts
or mounting fixtures; and any other condition that may affect proper operation. Any part
that is damaged should be properly repaired or replaced by a qualified technician. Do
not use the tool if any switch does not turn On and Off properly.
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20. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use accessories
intended for use with this tool. Approved accessories are available from Harbor Freight
Tools.
21. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels on prescriptions to determine if your judgment or reflexes are impaired while
taking drugs. If there is any doubt, do not operate the tool.
22. Comply with safety warnings. Failure to comply with all of these warnings may
cause loss of load, damage or failure of the jack, or personal injury and property
damage.
Unpacking
When unpacking, check to make sure the following parts are included. If any parts are
missing or broken, please call Harbor Freight Tools at the number on the cover of this
manual. If any part of the machine is missing or broken, please call Harbor Freight Tools at
the number on the front cover as soon as possible.
WARNING:
ALWAYS EVALUATE YOUR TASK BEFORE USING THIS JACK. This jack is
designed to support a transmission or a differential as individual components.
Assemblies such as a differential with axle, or a transmission with bell housing, can be
bulky and difficult to balance on the jack’s platform or cradle.
LIFTING OR SUPPORTING SUCH ASSEMBLIES, EVEN WITHIN THE WEIGHT LIMIT,
CAN CREATE AN OFF-BALANCE SITUATION, CAUSING THE JACK TO TIP OVER
AND LEAD TO SERIOUS PERSONAL INJURY OR PROPERTY DAMAGE.
The load should be evenly distributed on the jack, and should not extend beyond the
area of the castor wheelbase. Always use safety straps or chains to secure the load.
If you are working and the load becomes off-balance and/or the jack begins to tip over,
DO NOT ATTEMPT TO CATCH OR LIFT WHEN FALLING. SERIOUS PERSONAL
INJURY CAN BE SUFFERED! In this event, clear the area as quickly and safely as
possible in order to avoid injury from the falling load, including getting hit with flying
fragments.
IF IN DOUBT ABOUT THE SAFETY OFYOUR PROJECT, WE ADVISE YOU TO HAVE
THE WORK DONE BY A PROFESSIONAL FAMILIAR WITH APPLICABLE SAFE
PRACTICES.
Assembly
Before installing the angle brackets (#30), claws (#27), and chain (#26) to the base panel
(#24), refer to parts breakdown illustration on the last page. Verify all necessary parts for
assembly are in the parts bag.
1. Place the Transmission Jack on a clear area on the floor.
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2. Place the angle brackets (#30) on each side of the base panel (#24) as shown below.
3. Insert the bolts (#30A) up through the bottom of the base panel (#24), and then the
washers and nuts onto the bolts as they protrude through the angle brackets (#30).
Adjust to desired width then tighten nuts thoroughly.
Claw (#27 - Typical of 4)
Nut (#48 - Typical of 4)
Bolt, washer, nut (#30A)
Key, Washer, Nut (#28)
Chain (#26)
bolted to claw
Angle Bracket (#30)
Angle Screw (#25)
Bolt (#49 -
Typical of 4)
Base Panel (#24)
Angle Bracket (#30)
4. Mount each claw (#27) on the inside of the angle brackets (#30) using bolts (#48), nuts
(#49), and washers, as shown in the illustrations. Nuts and washers should be on the
inside. Adjust distance to desired cradle width for the transmission, then tighten.
5. Insert the key ( #28 - where chain is temporarily attached) into the upper claw (#27)
hole from the outside.
6. Place the washer and nut on the other end of the key (inside claw) and tighten.
7. Bolt the chain (#26) to the outside of the diagonally opposite claw (top hole).
8. Remove the plastic cap on the Air Valve (#9) before operating the jack. Failure to do so
may cause improper jack operation.
Operation
1. Turn the Pressure Valve Knob (#6) counterclockwise to open, lowering tranmission
saddle. Turn Pressure Valve Knob clockwise to close.
2. With the vehicle properly secured and raised to the correct height to remove the
transmission, move the jack into position under the transmission.
3. Raise the saddle by moving the Pump Handle (#11) up and down until the claws (#27)
are just below the front and rear of the transmission.
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Angle Screw (#25)
Travel Screw
(#29 opposite side)
Pump Handle (#11)
AirValve (#9)
PressureValve Knob (#6)
4. Adjust the saddle Travel Screw (#29) and the slant Angle Screw (#25) to align with the
shape of the transmission. Adjust the claws (#27) if necessary.
5. Continue moving the saddle up until the transmission is resting on the saddle.
6. Carefully move the jack to free the transmission from its location.
7. Slowly turn the Pressure Valve Knob (#6) counterclockwise to open, lowering the
transmission.
8. Pull the Chain tightly over the transmission and hook the nearest link onto the chain
Key (#28) to secure.
9. The transmission can now be safely moved.
10. Reverse this procedure when mounting a transmission.
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Maintenance
The hydraulic cylinder assembly contains hydraulic fluid that must be kept approximately
80% full at all times for proper operation. To check the level and refill, follow these steps.
Note: The hydraulic cylinder has a capacity of 8.4 ounces of hydraulic fluid.
Adding Hydraulic Fluid
1. Turn the Pressure Valve Knob (#6) counterclockwise to allow saddle to lower
completely.
2. Remove the Air Valve (#9) by unscrewing. (Keep screw in a safe place)
3. Visually inspect the inside of the air valve opening. The hydraulic fluid must be 80% of
the capacity of the hydraulic cylinder.
4. Fill with clean hydraulic fluid only.
5. Replace Air Valve.
Bleeding Air from the Hydraulic System
1. Place jack in a clear floor area.
2. Turn the Pressure Valve Knob (#6) counterclockwise to allow saddle to lower
completely and release pressure.
3. Unscrew Air Valve (#9) 1/2 turn counterclockwise.
4. Hold the saddle down while moving the Pump Handle (#11) up and down several
times.
5. Tighten the Air Valve.
Seal Replacement
0-rings and seals can be purchased if you need to have your jack serviced. Take the jack to
a qualified mechanic along with the 0-rings and seals. The Transmission Jack cannot be
user serviced.
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Parts List
Item #
Description
Qty
Item #
Description
Qty
1
Master Clinder Body
1
23
FC Base Assembly
1
24
25
26
27
28
29
30
31
32
33
Base Panel
1
1
1
4
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
5
1
1
1
1
1
1
1
1
2
3
Brass Valve
Plunger
1
1
1
Angle Screw Assembly
Chain
3A
O-ring
4
Pump Piston
1
Claw
4A
5
Pump O-ring
Pump Bracket
Split Pin
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Key w/ Washers and Nuts
Screw Assy w/ Nut and Pin
Angle
5A
6
Pressure Valve Knob
Pin
Cylinder Fixing Pin
Arm Band Pin
Caster Assembly
6A
7
Oil Tank Bolt
Release Packing Washer
Oil Tank
7A
8
33B Thrust Bearing
33C Caster (only)
9
Air Valve
35
Drag Handle (not shown)
9A
10
11
12
13
14
O-ring
35A Piston Assembly CP
35B-A Piston Packing Set
35D FC Hex Nut Set
35RK Packing Set (repair kit)
Pump Band Assembly
Pump Handle
Cylinder (pipe)
FC Piston
37
46
Rod Fixing Bolt
Piston Band Pin
Rod
14A Pin
14C Pin
46A Split Pin
14D Spring Ring
47
48
49
50
51
52
53
54
55
56
57
Oil Stop Nut
15
16
Cylinder Packing
FC Hex Nut
Nut
Bolt
16A O-ring
Lifting Rod
Long Rod
Steel Ball
Valve Housing
Spring
17
18
Copper Nozzle
Pressure Valve O-ring
18B Rod Fixing Pipe
19B Frame
20
21
22
FC Hex Backup Ring
Rubber Packing (S)
Rubber Packing (L)
Bolt
Packing Washer
Bolt
22B Horizontal Bracket
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Parts Illustration
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