HYDRAULIC SPRING
®
COMPRESSOR SET
Model 47890
ASSEMBLY and OPERATING
INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at http://www.harborfreight.com
Copyright © 2002 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
Maximum Compression 1500 Lbs.
Pump Size 5” H x 3” W x 14” L
Cylinder Size 2” Dia. x 12-1/2” L
Retracted Length 17-1/2”
Extended Length 22-1/2”
Ram Travel 5-1/2”
Coil Capacity 6.5” Max. (large), 5” Max. (small)
Pump Hose 5’ L
Weight 47 Lbs.
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 alwa ys be follo wed 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 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 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.
8. Do not overreach. Keep proper footing and balance at all times. Do not reach over or across
running machines.
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9. Maintain tools with care. Keep tools clean for better and saf er performance. Follow
instructions for lubricating and changing accessories. Inspect tool cords periodically and, if
damaged, have them repaired by an authorized technician. The handle must be kept clean,
dry , and free from oil and grease at all times .
10. Stay alert. Watch what you are doing, use common sense. Do not operate any tool when you
are tired.
11. 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 mo ving 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.
12. Guard against electric shock. Prevent body contact with grounded surfaces such as pipes,
radiators, ranges, and refrigerator enclosures.
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, maintenance should be performed regularly by a qualified
technician.
16. Never leave a loaded spring unattended. Whenever a strut spring is compressed, a lot of
force is stored in the spring. This must be controlled and monitored until the spring is relaxed.
17. Keep hands and fingers away from the Spring Compressor when applying or releasing
a load.
18. Release a load from the Spring Compressor before performing any service or
maintenance. Do not mo ve the tool, service the pump, or clean a Strut Assembly while it’s
under a load.
19. Do not allow contact with lubricants. Make sure the Spring Compressor is clean and all
lubricants are washed off prior to use. Lubricants will diminish it’s ability to hold the sping
firmly and safely.
Never exceed the maximum capacity of 1500 Lbs. Personal injury or property damage
may result if you exceed the capacity of the Spring Compressor.
20. Warning: De-grease the strut spring to be compressed. Ne ver attempt to compress a
dirty spring.
21. Warning: The maximum force which can be applied by the Strut Spring Compressor is 1,500
Lbs. Use the Strut Spring Compressor only on passenger cars and pickup trucks. Using the
Struct Spring Compressor at a force greater than 1,500 lbs. may result in personal injury and/or
property damage.
22. Do not allow any lubricants to contact the Coil Brackets (#16) of the Hydraulic Spring
Compressor . Lubricants of any type on the above mentioned parts will diminish the ability of the
Hydraulic Spring Comporessor to firmly and safely grip and hold a Strut Spring in position, which
may result in personal injury and/or property damage.
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Warning: This product contains or produces a chemical known to the State of California to cause cancer and birth defects (or other reproductive harm). (California Health
& Safety Code 25249.5 et seq.)
Warning: The warnings, cautions, and instructions discussed in this instruction manual can-
not 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.
Unpacking
When unpacking, check to mak e sure the parts listed on pages 6 and 7 are included. If any
parts are missing or broken, please call Harbor Freight Tools at the number on the cover of
this manual as soon as possible.
Assembly
The only assembly required is the mounting of the large or small set of Coil
Brackets (#16).
Removing existing Coil Brackets (#16).
1. On the Coil Bracket Base (#15), remove the existing Coil Brackets (#16) by removing
the Bolt (#13), Lock Washer (#12), and Washer (#11). Repeat with other side.
Adding a Coil Bracket (#16 ).
2. Line up the holes on the Coil Bracket (#16) with the holes on the Coil Bracket
Base (#15). Put a Lock Washer (#12), and a Washer (#11) on a Bolt (#13), and thread it
through the Coil Bracket Base (#15), into the Coil Bracket (#16 ). Repeat with other side.
Operation
Refer to both Assembly Drawings on pages 8 and 9.
Note: This product is to be used to remove a strut spring fr om a strut assemb l y pre vi-
ously removed from a vehicle. For the purpose of this manual, it is assumed that this
tool will be used to remove a strut spring from a generic type of strut assembly previously removed from a vehic le. Y ou must f ollow the directions in the vehicle manual (not
included) specific to your strut assembly
1. Attach the hose from the Hand Pump (#17) to the Cylinder Screw (#9) within the
Connection Nut (#10).
2. Tighten (clockwise) the Release Valve (#15a) on the Pump (#17).
3. To move the Coil Brackets (#16) closer together slowly pump the Handle Grip (#38a).
4. T o adjust them aw ay from each other , loosen (countercloc kwise) the Release Valve (#15a)
on the Pump (#17).
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Operation (continued)
5. De-grease the spring to be compressed. Never attempt to compress a dirty spring as it
may slip from the brackets causing injury or damage.
6. Make sure you have the proper size Coil Brackets (#16) for the spring. If not, change
them according to the assembly directions on page 4.
7. Adjust the Coil Brackets (#16) according to the directions under Operation on page 4 so
that the recessed lips (See Assembly Drawing 1) of the Coil Brac kets (#16) fully contact the
furthermost top and bottom spring coils within the strut assembly.
Note: Make sure you tighten (clockwise) the Release Valve (#15a) on the Pump (#17).
8. Check to make sure that the top and bottom of the vehicle’s spring coils are firmly in
contact with the Coil Brackets (#16).
9. Clear the area of all observers.
10. Keep your hands clear of the spring.
11. Slowly pump the Handle Grip (#38a) to compress the spring.
Removing strut assembly from spring.
12. After fully compressing the spring, remove the spring from the strut assembly by follo wing
the manual (not included) specific to your struts. Per the manual’s (not included) instructions,
remove the appropriate hardware (Upper Spring Cap & Piston Rod Nut) that connects the
spring to the strut assembly.
13. Slo wly release (counterclockwise) the Release Valve (#15a) on the pump to release the
load on the Spring Compressor.
14. If necessary (according to the strut manual) loosen nuts that hold spring to the strut
assembly.
15. The vehicle’s str ut assembly may now be removed from the Spring Compressor.
Reassembly
16. Reassemble the strut assembly with the exception of the Spring Cap & Piston Rod Nut.
17. Follow steps five through eleven above to compress the spring.
18. Following the strut manual (not included), replace the strut assembly hardware into the
spring, securing the Piston Rod Nut onto the Piston Rod, and replacing the Upper Spring
Cap.
19. Slo wly release (counterclockwise) the Release Valve (#15a) on the pump to release the
load on the Spring Compressor. Once the Coil Brackets (#16) are clear of the furthermost
top and bottom spring coils, remove the tool.
Maintenance
To keep the pump working properly, air must be bled from the hydraulic system when
performance begins to decline.
1. Tighten (clockwise) the Release Valve (#15a) on the pump while the pump hose is still
attached to the main assembly.
2. Remo ve the Oil Fill Cap (See Assemb ly Dra wing 2). Pump the Handle Grip (#38a) slowly
to bleed air from the system. Repeat until no more air leaves the system.
3. Add clean, high quality h ydraulic oil if necessary and then replace the Oil Fill Cap . Loosen
(counterclockwise) the Release V alve (#15a).
4. Test the pump by tightening the Release V alve (#15a) and pumping the Handle
Grip (#38a) ten times, making sure the Coil Brackets (#16) compress. If the pump is still not
performing properly, repeat the bleeding procedure.
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PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFA CTURER AND/OR DISTRIBUT OR HAS PROVIDED THE PARTS DIAGRAM IN THIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBUTOR MAKES ANY REPRESENTA TION OR W ARRANTY OF ANY KIND TO THE BUYER THAT HE
OR SHE IS QUALIFIED TO MAKE ANY REP AIRS T O THE PRODUCT OR THA T HE OR SHE IS
QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER
AND/OR DISTRIBUTOR EXPRESSLY STATES THA T ALL REP AIRS AND PARTS REPLACEMENTS
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND NO T 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 REPLA CEMENT PARTS THERETO.
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Parts List 1 (Main Assembly)
Pa rt No. Description Qt y.
1 Screw 1
2 Spring 2
3 Nut 1
4 Bushing 1
5 Sealing Ring 1
6 Retaining Ring 1
7 Piston Rod 1
8 Cylinder 1
9 Cylinder Screw 1
10 Connection Nut 1
11 Washer 4
12 Lock Washer 4
13 Bolt 4
14 0-ring 2
15 Coil Bracket Base 1
16 Coil Bracket 4
17 Hand Pump 1
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Parts List 2 (Pump)
Part No. Description Qty. Part No. Description Qty.
1a Valve Block 1 22a Screw 1
2a Oil Filter 1 23a 0-ring 1
3a 0-ring 2 24a Screw 1
4a Reservoir 1 25a Screw Cover 1
5a Tie Rod 2 26a Screw 1
6a NylonRing 1 27a Nylon Ring 1
7a Nut 1 28a Sealing Ring 1
8a Ring 1 29a Screw 1
9a Breather Valve 1 30a 0-ring 1
10a Screw 1 31a Nylon Ring 1
11a 0-ring 3 32a Piston 1
12a Pump Foot 1 33a Pin 1
13a Ball 2 34a Retaining Ring 2
14a 0-ring 1 35a Pin 1
15a Release Valve 1 36a Handle Socket 1
16a Hose 1 37a Handle 1
17a Coupler 1 38a Handle Grip 1
18a Dustproof Cover 1 39a Screw 1
19a Ball 1 40a Screw 1
20a Ball Cap 1 41a Spring 1
21a Spring 1 42a Ball
Note: When ordering pump parts off of Parts List 2 (referring to Assembly Drawing 2 on page
9), make sure you add the suffix “a” to the order number.
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Assembly Drawing 1
Lip of Coil Bracket
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Assembly Drawing 2
Note: When ordering pump parts off of Parts List 2 (referring to Assembly Drawing 2 on page
9), make sure you add the suffix “a” to the order number.
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Oil Fill Plug
Page 9
REV 12/04
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