Harbor Freight 91939 Users Manual Wheel Balancer

91939 to the manual ae96729a-9f2b-4d5b-b65d-0605506a0e99

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Aluminum
Wheel
Balancer
with Level

91939
ASSEMBLY AND OPERATING INSTRUCTIONS

3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web 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

Specifications

Construction:

Die Cast Aluminum
Steel Ball Bearings
Bullseye Bubble Level

Dimensions:

Balancer Diameter 1-1/4" to 6" taper
Height: 9-1/2"
Base Diameter: 5-1/2"

Hub Size:

2" to 5-1/2" Diameter

Net Weight:

2.30 Lbs.

Leveling:

3 Base Bolts included

Max. Weight Capacity:

1 3 2 L b s.

This tool is very useful for balancing wheels with hub diameters from 2 to 5-1/2”. The
bullseye bubble level will tell you immediately whether a wheel is in balance, and will
guide you in placing the appropriate weights (not included) to achieve balance. This
simple, sturdy tool requires no power, and may be used on any hard, level surface.

Save This Manual
You will need the manual for the safety warnings and precautions, assembly instructions,
operating and maintenance procedures, parts list and diagram. 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.

Safety Warnings and Precautions
WARNING: When using tool, basic safety precautions should always be followed
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 lit. Do not use
electrically powered tools in the presence of flammable gases or liquids.

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.

SKU 91939

Page 2

6.

Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically non-conductive clothes and non-skid
footwear are recommended when working. Wear restrictive hair covering to
contain long hair.

7.

Use eye and ear protection. Always wear ANSI approved impact safety goggles.
Wear an ANSI approved dust mask or respirator when working around metal,
wood, and chemical dusts and mists.

8.

Do not overreach. Keep proper footing and balance at all times. Do not reach
over or across running machines.

9.

Maintain tools with care. Keep tools maintained and clean for better and safer
performance. Follow instructions for lubricating and 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
wrenches are removed from the tool or machine work surface before operating.
11. Stay alert. Watch what you are doing, use common sense. Do not operate any
tool when you are tired.
12. 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.
13. 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.
14. 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.
15. Maintenance. For your safety, service and maintenance should be performed
regularly by a qualified technician.
Warning: The warnings, cautions, and instructions discussed 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 factors
which cannot be built into this product, but must be supplied by the operator.

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Unpacking
When unpacking, please compare with parts list to be sure that all parts are included.
If any parts are missing or broken, please call Harbor Freight Tools at the number
on the cover of this manual.

Assembly
1.
Install all three Base Bolts (F) into the Base
(E) approximately 1/2 way. These bolts will be used
to level the Balancer on your floor. NOTE: For best
results, you should use the Balancer on a hard
level surface, such as a cement garage floor.
2.
Thread one of the Nuts (D) approximately
2” up the Shaft (B). Insert the Shaft (B) through
the hole in the Base (E) as in the assembly diagram.
Thread the second Nut (D) onto the shaft, and
tighten to lock the Shaft (B) onto the Base (E).

3.

Place the Hub Support (C) onto the
Shaft (B).

4.

Place the Bubble Level (A) onto the
top of the Hub Support (C).

5.

Level the Wheel Balancer relative to your
floor by adjusting the Base Bolts (F) up
or down, until the bubble in the Bubble
Level (A) is centered in the bullseye
marked in the center of the level.

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Operation
1.

To operate your Wheel Balancer, first ensure that it is properly assembled and
level with your floor as discussed above.
2.
Remove the Bubble Level (A) from
the top of the Wheel Balancer to protect it
from possible damage when placing the
wheel on the balancer.
NOTE: Before balancing, remove all
weights from the wheel rim, and assure
that the wheel, tire and stem are in finished
condition as they will be installed on the
vehicle.

Bubble Level (A)

3.
Place your wheel horizontally with
the valve stem up on the balancer with the
top of the Hub Support (C) protruding
through the center of the wheel. Be sure
that the wheel is level on the Hub Support
(C) by adjusting the alignment of the wheel
to the concentric circles marked around the
Hub Support (C).

4.

Replace the Bubble Level (A) on top of the Hub Support (C).

5.

The Bubble Level (A) will indicate an out-of-balance wheel by showing the bubble
out of the center of the bullseye. The bubble will move toward the “light” side of
the wheel.

6.

Balance the wheel by placing wheel weights of various sizes (not included) on
the rim side indicated as “light” by the Bubble Level (A). Careful placement of
weights will result in the wheel being balanced. The bubble in the Bubble Level
(A) will be centered in the bullseye when the wheel is balanced.

WARNING: When balancing, only place the weights where they are needed. DO NOT
hammer the weights in place while the wheel is on the Balancer. This will result
in damage to the Balancer. Mark the position of the weights, and hammer them on to
the rim after the wheel has been removed from the Balancer.
7.

Recheck your work after you have installed the weights. Replace the wheel on
the balancer with the valve stem up. Check to ensure that the bubble is centered
in the bullseye. If it is not, remove the wheel from the balancer, remove the
weights from the wheel, and start again from step 3 above. For best results it is
inportant that your wheels are properly balanced before using them on your
vehicle.

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Maintenance
1.

If the Wheel Balancer is to be used only occasionally, you should disassemble
it and store it in a dry, secure place between uses.

2.

If the Wheel Balancer will remain on your shop floor, protect it from damage and
hard use. It is a precision tool which may be easily damaged by being banged
around.

3.

The Bubble Level (A) is especially subject to damage. When not in use, remove
it from the Balancer and store in a safe place. To protect it from accidental
damage, always remove the Bubble Level (A) from the Balancer when placing
the wheel on the Balancer.

Parts List

Part #

D escription

Q'ty.

A

Bubble Level

1

B

Shaft m10 x 155

1

C

Hub Support

1

D

Nut m10

2

E

Bottom

1

F

Base Bolts m6 x 20

3

NOTE: Some parts are listed and shown for illustration purposes only and are not
available individually as replacement parts.

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Page 6

Assembly Drawing

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.

SKU 91939

Page 7



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Create Date                     : 2004:07:13 09:10:12-07:00
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Subject                         : 91939 Wheel Balancer
Page Count                      : 7
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Metadata Date                   : 2004:07:13 16:10:12Z
Creator                         : Steven Miller
Title                           : 91939 Wheel Balancer
Description                     : 91939 Wheel Balancer

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