Central Hydraulics 39178 User manual

450 Lb. Capacity450 Lb. Capacity
450 Lb. Capacity450 Lb. Capacity
450 Lb. Capacity
TT
TT
Transmission Jackransmission Jack
ransmission Jackransmission Jack
ransmission Jack
ASSEMBLY AND OPERATING INSTRUCTIONS
Note: Thistoolrequresa1/2”DriveRatchetorBreaker
Bar to operate (neither one included).
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit ourWeb site at http://www.harborfreight.com
Copyright©2004 by Harbor Freight Tools®. 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
TO PREVENT SERIOUS INJURY, READ AND UNDERSTAND
ALL WARNINGS AND INSTRUCTIONS BEFORE USE.
39178

SKU39178 Page 2
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Specifications
SaveThis Manual
You will need the manual for the safety warnings and precautions, assembly
instructions,operating andmaintenance procedures,partslist anddiagram. Keep
your invoice with this manual. Write the invoice number on the inside of the front
cover. Keep the manual and invoice in a safe and dry place for future reference.
SafetyWarnings and Precautions
WARNING:Whenusingtool,basic safetyprecautionsshouldalwaysbefollowed
to reduce the risk of personal injury and damage to equipment.
Read all instructions before using this tool!
1. Keep work area clean. Cluttered areas invite injuries.
2. Observe work area conditions. Do not use machines or power tools in
damp or wet locations. Don’t expose to rain. Keep work area well lighted.
3. Keep children away. Children must never be allowed in the work area. Do
not let them handle machines, tools, or extension cords.
4. 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.
5. Use the right tool for the job.Do not attempt to force a small tool or
attachment to do the work of a larger industrial tool. There are certain
applications for which this tool was designed. It will do the job better
and more safely at the rate for which it was intended. Do not modify this
tool and do not use this tool for a purpose for which it was not intended.
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught
inmovingparts. Protective, clothesandnon-skid footwear arerecommended
when working. Wear restrictive hair covering to contain long hair.
Note: This tool requres a 1/2” Drive Ratchet or Breaker Bar to operate
(neither one included).

SKU39178 Page 3
7. Use eye and ear protection. Always wear ANSI approved impact safety
goggles.Wearan ANSIapproveddust mask orrespiratorwhen working
around metal, wood, and chemical dusts and mists.
8. Do not overreach. Keep proper footing and balance at all times.Do not reach
overor acrossrunningmachines.
9. Maintain tools with care. Keep tools sharp and clean for better and safer
performance.Followinstructions forlubricatingand changing accessories.
The handles must be kept clean, dry, and free from oil and grease at all
times.
10. Remove adjusting keys and wrenches. Check that keys and adjusting
wrenchesare removedfrom the toolor machinework surface before
operating.
11. Avoid unintentional lowering. Keep feet and hands away from the pump
pedaland releasepedal when youare notprepared toraise or lowerthe jack.
12. Stay alert. Watch what you are doing, use common sense. Do not operate
any tool when you are tired.
13. 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
beproperlyrepaired orreplacedby a qualifiedtechnician.
14. Replacement parts and accessories. When servicing, use only identical
replacement parts.Use of any other parts will void the warranty.Only use
accessoriesintended foruse withthis tool.Approved accessoriesare
availablefromHarborFreightTools.
15. Do not operate tool if under the influence of alcohol or drugs. Read
warninglabels on prescriptionsto determineifyour judgmentorreflexes are
impaired while taking drugs. If there is any doubt, do not operate the tool.
16. Maintenance. For your safety, service and maintenance should be performed
regularlyby a qualifiedtechnician.
17. Do not exceed the weight limit of this jack. Overloading the jack may result
in unexpected, rapid lowering of the object being held, as well as damage to
the jack itself.Serious injury and property damage may result.
18. Assure that any load being supported by this jack is well balanced.
Unbalanced loads may cause the jack to fall over potentially causing serious
personalinjuryor property damage.

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19. This jack is not to be used for any aircraft purposes.
20. Jack to be used on a flat, level surface capable of supporting the weight of
the jack, the workpiece and related tools
Warning:The warnings,cautions,andinstructionsdiscussed in this instruction
manual cannot cover all possible conditions and situations that may occur. It
must be understood by the operator that common sense and caution are fac-
tors which cannot be built into this product, but must be supplied by the opera-
tor.
Unpacking
When unpacking, check to make sure the following parts are included.
(1) Jack Assembly (4)Caster WheelSetswithhardware
If any parts are missing or broken, please call Harbor FreightTools at the number
onthe coverof this manual.
Assembly
Prepare for assembly by having a clean, well lit location.You will need a small
open-endor adjustablewrench(not included)to complete assembly.
1) Locatethe fourCasters Assemblies (16), fourNuts (14)and fourSpring
Washers (15). Attach a Caster to each of the legs on the Base Assembly (13)
using these as shown in the Assembly Diagram.Tighten securely.
WARNING: Do not overload this jack.The jack may be damaged, and you
mayexperienceunplanned,rapidloweringoftheload.Thismaycause
severepersonalinjury orproperty damage.
WARNING:Donotcarryanunbalancedload,ora load not appropriatetothe
designed use of this jack.The jack may topple over causing serious
personalinjury orpropertydamage.
WARNING: Be aware of dynamic loading! A sudden start or jerk on the jack may
create for a brief instant, an excess load, which may result in damage to
theproductand/or personalinjury.

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Operation
WARNING:Beforestandingorworkingunderneathanyelevatedvehicleorotherobject,
besurethat the vehicleisproperly and safelysecuredfollowing recommendations of
the lift manufacturer.For your safety and the safety of others, use good professional
practice and common sense. Only use on a flat, level surface capable of supporting
the weight of the jack, the workpiece and related tools.
1) The jack may easily be moved by rolling it on its casters. Locate the jack under
thetransmission.Usinga1/2”DriveRatchetorBreakerBar(neitheroneincluded)
engaged in Bushing (35), rotate the Screw Rod (29) clockwise in order to raise
the jack until the Saddle (3) nearly contacts the underside of the transmission.
Adjust the position of the jack so that it is centered directly under the center of
gravity of the transmission.
2) It is important for your safety to get a good contact between the Saddle (3) and
the transmission.This will assure that the transmission is properly supported
andbalanced onceremovedfrom thevehicle andon thejack.LoosentheWing
Nuts (5) and raise the jack again until the Saddle (3) contacts the transmission
and presses slightly against it.
3) Secure the transmission to the Saddle (3) by passing the RatchetTie-down (7)
over the top of the transmission, and securing it using the buckle. Be sure that
itistight.PleasereviewsectiononRatchetTie-downoperationnextpage. Tighten
theWingNuts (5) andraisethejackuntilthe transmission’s weightis supported
by it.
4) Remove the bolts and fittings attaching the transmission to the vehicle, as
recommended by the vehicle’s repair instructions.
5) Lower the transmission slightly by turning the Bushing (35) counterclockwise.
Recheck the transmission to assure that it is securely and safely attached to
theSaddle(3).Make anynecessaryadjustments.Whenit is safe todoso, lower
the transmission all the way by turning the Bushing (35). For safety, 2 people
shouldbeworking togethertoperform these operations.
6) While stabilizing the transmission on the jack, roll the transmission out from
under the vehicle to the work location where it will be repaired. It is a good idea
to have an assistant help you lower and move the transmission.
WARNING: The use of this jack is limited to the removal, installation, and transportation in
the lowest position, of transmissions and differentials. Do not store the transmission or any
other part on the jack,unless the jack is in the lowered position. However, the jack is not
appropriate as a long-term storage device. Never move the jack unless it is in its lowest
position.
Do not overload. Overloading can cause damage to the jack and cause consequential
personal or property injury.This jack is designed to use only on hard, level surfaces capable
of supporting the load. Use on other surfaces may cause instability and possible property
damage or personal injury.

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RatchetTie-down Operation
The Ratchet Tie-down (7) is used to secure the transmission to the jack to
prevent the transmission from falling off during use.
1) To secure the transmission to the jack, first pass the belt over the top of the
transmission.Be sure the belt is not twisted, and is not pressing on any part of
thetransmissionthat might bedamaged,suchas the speedometercablefitting,
etc.
2) Pass the end of the belt through the
ratchet behind the reel, and through
the slot in the reel, as shown in the
photo.
3) Tightenthebeltbypressingtheratchet
handle repeatedly downward, as
showninthe photo.
Maintenance
1) Themechanicalparts of thejack,such as theScrewRod(29) and hingepins of
the Adjustable Frame (10) should occasionally be lubricated with heavy oil or
grease.
2) Maintainandstorethejackinareasonablyprotectedenvironment.Donotexpose
to rain or excess moisture. Protect from salt water or other corrosive materials.
Ifit becomes dirty,clean it promptlywith clean waterora suitabledetergent. Be
awarethatusing apressurewasherto cleanitmayremove somepaintfromthe
outersurface. Besure to lubricate(outlined above)after cleaning.
ReleaseTab BReleaseTab A
Flange 4) When preparing to remove the Tie-
down,have an assistantstabilize the
transmission on the jack to keep it
fromfalling.
5) To removethe belt:Pull releasetabA
away from the spool and swing the
upper handle wide open until it rests
on the raised portion of the flanges,
as shown in the photo to the left.
WARNING:Keepyourfingersclearof
thespool when releasingtheratchet;
it will rotate as the belt is released.
When the belt is loosened, pull it out
of the buckle and remove the belt.

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Parts List
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER
NOR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO
THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE
PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE
PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THat ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN
BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE BUYER.THE BUYER
ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS
OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
NOTE: Some parts are listed and shown for illustration purposes only and are not
available individually as replacement parts.
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Assembly Drawing