Harbor Freight Single Action Strut Spring Compressor Product Manual

Manual for the 43753 Single Action Strut Spring Compressor 43753 Single Action Strut Spring Compressor

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Strut Spring Compressor

Item 43753

Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

When unpacking, make sure that the product is intact and undamaged.
If any parts are missing or broken, please call 1-800-444-3353 as soon as possible.

Visit our website at: http://www.harborfreight.com

Copyright© 2000 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. Diagrams within this manual may not be drawn
proportionally. Due to continuing improvements, actual product may differ slightly from the
product described herein. Tools required for assembly and service may not be included.

For technical questions or replacement parts, please call 1-800-444-3353.

Manual revised 11b

Specifications
Capacity
Maximum Opening
Lead Screw Torque
Compressor Type

7″ Coil Spring Diameter
8″
15 ft-lb minimum
MacPherson Struts Only

Save This Manual

CAUTION, used with the safety
alert symbol, indicates a hazardous
situation which, if not avoided, could
result in minor or moderate injury.

NOTICE is used to address practices
not related to personal injury.

You will need the manual for the
safety warnings and precautions, assembly
instructions, operating and maintenance
CAUTION, without the safety alert
procedures, parts list and diagram.
symbol, is used to address practices
Keep your invoice with this manual.
not related to personal injury.
Write the invoice number on the inside of the
front cover. Keep the manual and invoice in
Safety Warnings
a safe and dry place for future reference.

Important Safety Information
In this manual, on the labeling, and all other
information provided with this product:
	 This is the safety alert symbol.
It is used to alert you to potential
personal injury hazards.
Obey all safety messages that
follow this symbol to avoid
possible injury or death.

DANGER indicates a hazardous
situation which, if not avoided, will
result in death or serious injury.

WARNING indicates a hazardous
situation which, if not avoided, could
result in death or serious injury.

	 WARNING Read all safety
warnings and instructions.
Failure to follow the warnings and
instructions may result in electric
shock, fire and/or serious injury.
Save all warnings and
instructions for future reference.
1.	 Tighten and release evenly and slowly.
Only use hand tools to tighten/release.
Do not use any air, electric, or impact
tools with this tool. Only operate this
tool with a 3/4″ socket and ratchet,
3/4″ combination wrench, or
other applicable hand tools.
Power, air, or electric tools may
compress the spring too
quickly, leading to injury.
2.	 Use provided pins to secure spring
in place before use.
3.	 Set compressed spring in safe area. Be
careful when spring is compressed. Do
not drop or jar spring. Doing so might
result in the spring forcefully flying free,
causing personal injury or damage.
4.	 Do not use on springs larger
than 7″ diameter.

Page 2

For technical questions, please call 1-800-444-3353.

SKU 43753

5.	 Wear ANSI-approved safety goggles
and heavy-duty work gloves during use.
6.	 Inspect before use; do not use
if parts loose or damaged.
7.	 Observe work area conditions.
Keep work area clean and well lit.
8.	 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. Do not modify this tool and
do not use this tool for a purpose
for which it was not intended.
9.	 Stay alert. Watch what you are
doing, use common sense. Do not
operate any tool when you are tired.
10.	 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.
11.	 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.

SKU 43753

12.	 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.
13.	 For your safety, maintenance should
be performed regularly by a qualified
technician. Have qualified service
technician inspect this tool annually.
14.	 Only use this tool with
MacPherson struts. Do not use
with high pitched springs.
15.	 If spring coils do not compress
evenly, loosen the adjusting screw,
reposition the strut spring, and retry.
16.	 Before initial use, apply grease to
the Adjustment Bolt. Also, apply
grease periodically during use.
17.	 When reaching the maximum torque
(15 ft-lb) by tightening the Adjustment
Bolt, discontinue, and loosen the
screw. Reposition and retry.
18.	 Support vehicle on jack stands
before working on it.
19.	 Follow instructions and precautions
in vehicle’s service manual.
20.	 The warnings, precautions, 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.

For technical questions, please call 1-800-444-3353.

Page 3

Assembly

Operation

	 Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of
this document including
all text under subheadings
therein before set up or
use of this product.
1.	 Insert the Adjustment Bolt (6) with
the Hex end up, through the hole in
the center of the Plain Axle (13).
2.	 Slide the Compression Spacer (20)
onto the Adjustment Bolt (6) before
continuing through the center hole
on the Threaded Axle (10).
3.	 Secure Adjustment Bolt (6)
with two Nuts (16).

	 Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of
this document including
all text under subheadings
therein before set up or
use of this product.

Remove MacPherson struts from the
vehicle before attempting repairs. Put the
struts in a MacPherson Strut Vise prior
to using the Strut Spring Compressor.
Only use hand tools with the Strut
Spring Compressor. Do not use any air,
electric, or impact tools with this tool.
Only operate this tool with a 3/4″ socket
and ratchet, 3/4″ combination
wrench, or other applicable hand tool.
Power, air, or electric tools may compress
the spring too rapidly, leading to injury.
1.	 Follow the vehicle service manual’s
instructions to remove the
MacPherson Strut from the vehicle.
2.	 Position the strut into a strut vise.
3.	 Shut the vise and tighten.
4.	 Open the Spring Compressor up to 8″.
Do not open more than 8″ or a long
strut may slip off of the tool.
5.	 Make sure the hex nut on top of the
Adjustment Bolt (6) is facing up.
6.	 Before clamping the spring,
slip the Safety Ring (19) over the
Hooks (5,7) as a safety precaution
should the strut break loose.
The Safety Ring (19) will keep the claws
from springing open and causing injury.

REV 01e, 08l

Page 4

For technical questions, please call 1-800-444-3353.

SKU 43753

7.	 Position the top hooks over the strut
springs and tighten the Adjustment
Bolt (6) so that the lower hooks will
fit over the spring. See Figure A.

9.	 Turn the Adjustment Bolt (6)
clockwise to compress the strut spring.
ONLY COMPRESS THE
SPRING ENOUGH TO
REMOVE THE DRIVE NUT.
WARNING! IF THE SPRING
DOESN’T COMPRESS EVENLY,
LOOSEN AND REPOSITION.

Low Hook

Figure A: Lower Hook
8.	 Make sure the same number of coils
are between the hooks on each of
the spring. Make sure the hooks are
securely fastened and sit in line with the
center axis of the spring. See Figure B.

WARNING! DO NOT OVERTIGHTEN.
Do not allow contact between
spring coils or between the arms
of the Strut Spring Compressor.
10.	 Remove the strut rod nut, mounting
plate, and spring seat.
11.	 Carefully remove the spring with the
strut spring compressor still attached.
12.	 Repair or replace the strut
(See service manual).
13.	 Set the spring over the repaired or
new strut and re-install the rod nut,
mounting plate, and spring seat.

8″ Max.

14.	 Loosen the strut spring
compressor and remove it.
15.	 Remove the strut from the strut vise.

Center
Axis

Figure B: Hook Location

SKU 43753

For technical questions, please call 1-800-444-3353.

Page 5

PLEASE READ THE
FOLLOWING CAREFULLY

Maintenance
	 Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of
this document including
all text under subheadings
therein before set up or
use of this product.

1.	 Grease the Adjustment Bolt (6)
threads regularly.
2.	 An annual Strut Spring Compressor
inspection is recommended.
Only qualified service technicians
should inspect this tool. If the tool
is used extensively, more frequent
inspections are recommended.

THE MANUFACTURER AND/OR DISTRIBUTOR
HAS PROVIDED THE PARTS LIST AND
ASSEMBLY DIAGRAM IN THIS DOCUMENT AS
A REFERENCE TOOL ONLY. NEITHER THE
MANUFACTURER OR 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.

Record Serial Number Here:

Note:	 If product has no serial
number, record month and
year of purchase instead.
Note:	 Some parts are listed and shown
for illustration purposes only,
and are not available individually
as replacement parts.

Page 6

For technical questions, please call 1-800-444-3353.

SKU 43753

Parts List and Assembly Diagram
Part
1
2
3
4
5
6
7
8
9

Description
Bolt
Nut
Retaining Ring
Hinge Axle
Hook
Adjustment Bolt
Hook
Axle Pin
Hook

Qty.
2
2
2
1
1
1
1
6
1

Part
10
11
12
13
16
17
18
19
20

Description
Threaded Axle
Hook
Spring
Plain Axle
Nut
Holding Pin
Pin Ring
Safety Ring
Compression Spacer

Qty.
1
1
2
1
2
4
4
1
1

16

REV 01e, 11b

SKU 43753

For technical questions, please call 1-800-444-3353.

Page 7

3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353



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