Astro 78241 User Manual

Model:

78241

Foreseen Use of the Tool

This set is designed to change front wheel bearings on front wheel

drive cars and light trucks. Do not use this tool outside of the

designed intent. Never modify the tool for any other purpose or use.

Product Type:

WHEEL BEARING REPLACEMENT

ADAPTER SET

www.astrotools.com

Safety Precaution

Caution: To help prevent personal injury

• Normal use of this product is likely to expose the user to
dust and/or microscopic particles containing chemicals
known to the State of California to cause cancer, birth
defects or other reproductive harm. Always wear
appropriate safety equipment and clothing when using this
product. Study, understand and follow all instructions
provided with this product. Failure to read and follow all
warnings and operating instructions may result in damages

and serious injury or death.

• Always wear ANSI approved goggles when using this

product. (Users and Bystanders).

• Always select the correct accessories of the correct size
and design for the job that you are attempting to perform.

• Always work in a clean, safe, well-lit, organized and

adequately equipped area.

• Do not begin repairs without assurance that vehicle is in
secure position, and will not move during repair.

PRODUCT INFORMATION

• Change front wheel bearings without the hassle of

removing steering knuckle or strut assembly

• Eliminates the need for front end alignment after service

work is completed

• For use with both domestic and import front wheel drive

cars and light trucks

• Corrosion resistant black oxide finish

IMPORTANT

Read these instructions carefully before
installing, operating, servicing or repairing this
tool. Keep these instructions in a safe
accessible place.

•Astro Pneumatic Tool Co. warrants our products to the original user against

1 YEAR LIMITED WARRANTY

defective material or workmanship for a period of 1 year from the date of 1st use.
Astro reserves the right to determine whether the product failed because of defective
material, workmanship or other causes and to charge back for missing parts. Astro
Pneumatic Tool Co., at its discretion, will repair products covered under this warranty
free of charge. The original user is to return the product (with the exceptions listed
below) with the distributor’s name, address, adequate proof of date of purchase or a
copy of warranty card, and a short note explaining the problem. Failures caused

by accident, alteration, or misuse are not covered by this warranty.

•If one part of this product fails, please do not return the entire product.
Astro will replace free of charge component parts of this product that fail
within 1 year of first use by the original user. Items included in this category
include but are not limited to kits, hand tool kits and any other product where
there are multiple items or components that make up the unit. Please contact
the phone number below in order to obtain the replacement components
covered under warranty.

•Astro Pneumatic Tool Co. or its authorized service representatives must perform all
warranty repairs. Any repair to the product by unauthorized service representatives
voids this warranty. The rights under this warranty are limited to the original user
and may not be transferred to subsequent owners.

•This warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability and fitness for a particular purpose. Some states do
not allow the exclusion of limitations of incidental or consequential damages so the
above limitations may not apply to you. All claims must be sent to:

Astro Pneumatic Tool Company
372 Old US Highway 52 South
Mt. Airy, NC 27030

PLEASE CALL 1-80 0-221- 9705

FOR REPAIR AND RETURN INSTRUCTIONS

Unpacking

When unpacking, check the parts diagram and part number
listing on page 6 to make sure all parts are included. If any
parts are missing or damaged, please call your distributor.

SPECIFICATIONS

• Construction : Low Carbon Steel

• Finish : Black Oxide

• Bushing Hardness : HRC25 to HRC35

• Bushing Range (Outside Diameter) : 2.17", 2.49", 2.62", 2.76", 2.81",

2.32", 2.87", 2.94", 2.91", 3.05",

3.21", 3.29", 3.46"

• Sleeve Sizes :

2.99" O.D. X 2.56" Long, 3.39" O.D. X 2.56" Long

3.58" O.D. X 2.56" Long, 4.02" O.D. X 2.56" Long

• Sleeve Plate Sizes :

3.39" O.D. X 0.71" Step, 4.02" O.D. X 0.70" Step

• Sliding Screw Size/Type : 8.23" Long X 0.75" Diameter / 16 NAT

• Nut Size : 2.66" Long x 0.75" Diameter

• Washer Sizer : 2.01" O.D.

Page 1

Model:

Product Type:

WHEEL BEARING REPLACEMENT

78241

OPERATING INSTRUCTIONS

To Remove A Bearing/Race Assembly:

NOTE: The following instructions apply to most FWD vehicles and are intended to illustrate the process in general
terms, not to be specific to anyone make/model vehicle. A combination of Sleeves (parts #1 thru #4), Sleeve Plates
(parts #5a and 5b), and Bushings (parts #6 thru #19), will be necessary for different vehicles.
Make sure to select the Sleeves deep enough to allow the removal of the bearing from the spindle. Also, make sure
to select the Bushings that contact the inner/outer race of the bearing and not the ball bearings. (See Figure A, and
Assy. Diagram.)

1. It will be necessary to make clear access to the bearing on both sides of the spindle. To do so, remove
the vehicle's front wheel, axle nut, and outer tie rod nut. Disconnect the lie rod. Remove the front brake and brake
rotor. Remove the axle from the hub, and with rope or wire, secure the axle out of the way from the job to be done.

NOTE: On some models it may be necessary to loosen the lower ball joint from the steering knuckle to prevent
damage to the axle from the hubs.

ADAPTER SET

2. Remove the retaining clip and seal (located in the opening in the steering knuckle) from the appropriate side of the
bearing. (See Figure A.)

3. Select a Sleeve (parts #1 thru #4) with a diameter large enough to rest against the outer edge of the steering knuckle.
(See Figure B, and Assy. Diagram.)

4. Select a Sleeve Plate (parts #5a, #5b) that will fit snugly on the Sleeve (parts #1 thru #4) being used.
(See Figure B, and Assy. Diagram.)

5. Place a Washer (part #22) on the Sliding Screw (part #21). (See Figure B, and Assy. Diagram.)

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