Central Pneumatic 90114 User manual

3” AIR HIGH
SPEED CUTTER
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit ourWeb site at http://www.harborfreight.com
Copyright © 2003 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
90114
®

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Specifications
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 lighted. 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.
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.
RPM’s 20,000 @ 90 PSI
Air Consumption 17 SCFM @ 90 PSI (5 SCFM Average)
Recommended and Maximum Air Pressure 90 PSI
Air Inlet 1/4” - 18 NPT
Weight 1.65 Lbs.
One cuttingWheel included.
REV 06/04

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8. Do not overreach. Keep proper footing and balance at all times. Do not reach over
or across running machines or air hoses.
9. Maintain tools with care. Keep tools clean for better and safer performance. Follow
instructions for lubricating and changing accessories. Inspect tool cords and air hoses
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. Disconnect air supply. Disconnect air hose when not in use.
11. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches
are removed from the tool or machine work surface before plugging it in.
12. Avoid unintentional starting. Be sure the Trigger is in the Off position when not in
use and before plugging in. Do not carry any tool with your finger on the Trigger when
the tool is connected to the air source.
13. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
14. Take caution as some woods contain preservatives such as copper chromium
arsenate (CCA) which can be toxic.When cutting these materials extra care should
be taken to avoid inhalation and minimize skin contact.
15. 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. Do not use the tool if any Trigger does not turn On and Off properly.
16. Guard against electric shock. Prevent body contact with grounded surfaces such
as pipes, radiators, ranges, and refrigerator enclosures.
17. 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.
18. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels if taking prescription medicine to determine if your judgment or reflexes are
impaired while taking drugs. If there is any doubt, do not operate the tool.
19. Use proper size and type extension cord. If an extension cord is required from the
air compressor being used, it must be of the proper size and type to supply the
correct current to the tool without heating up. Otherwise, the extension cord could
melt and catch fire, or cause electrical damage to the tool. Check your compressor’s
manual for the appropriate size cord.
20. Maintenance. For your safety, service and maintenance should be performed
regularly by a qualified technician.

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21. Pacemaker safety warning. People with pacemakers should consult with their
physician(s) before using this product; operation of equipment in close proximity to a
heart pacemaker could cause interference or failure of the pacemaker.
22. Use tools with both hands when required. Many tools such as chain saws, drills,
routers, and this High Speed Cutter, require the use of both hands when operating.
This helps maintain tool stability and keeps hands away from the working area of the
tool.
23. Compressed air only. Never use combustible gases as a power source.
24. 3”Cutting Disc. Only use a standard 3” cutting disc (rated at 20,000 RPM or greater)
with this Air High Speed Cutter. Never use any other type of disc, blade or cutter on
this air tool.
When unpacking, check to make sure the parts listed on page 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.
Unpacking
Operation
For best service you should incorporate an oiler, regulator, and inline filter, as shown in the
diagram above. Hoses, couplers, oilers, regulators, and filters are all available at Harbor
Freight Tools.
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction
activities, contain chemicals known [to the State of California] to cause cancer, birth defects or other
reproductive harm. Some examples of these chemicals are:
- Lead from lead-based paints
- Crystalline silica from bricks and cement or other masonry products
- Arsenic and chromium from chemically treated lumber
Your risk from these exposures varies, depending on how often you do this type of work. To reduce
your exposure to these chemicals: work in a well ventilated area, and work with approved safety
equipment, such as those dust masks that are specially designed to filter out microscopic particles.
(California Health & Safety Code 25249.5, et seq. )
Warning:The warnings,cautions,and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur. It must be under-
stood by the operator that common sense and caution are factors which cannot be
built into this product, but must be supplied by the operator.
Cutter 1/4” - 18 NPT

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Note: Performance of the compressor (if powered by line voltage) may vary depending
on variations in local line voltage. Extension cord usage may also affect tool perfor-
mance.
1. You will need to prepare a 1/4” air connector (sold separately) to connect to the Air
Inlet (#30) on the Cutter. First, wrap the 1/4” air connector (not included) with pipe thread
seal tape before threading into the Air Inlet (#30). Connect a 3/8” I.D. Air Source Hose to the
Cutter.
Note: If you are not using an automatic oiler system, before operation, add a few drops of
Pneumatic Tool Oil to the airline connection. Add a few drops more after each hour of
continual use.
2. Set the air pressure on your compressor to 90 PSI. Do not exceed the recommended air
pressure of 90 PSI.
3. Check the air connection for leaks.
4. Disconnect the air hose until next instructed to reconnect.
5. After disconnecting the air supply, squeeze the Trigger (#2) to make sure no air remains in
the unit.
Operation (continued)
Assembly
The only assembly required is the mounting of a cutting wheel.
Warning! The Cutter must be disconnected from the air supply when changing the cutting
wheel. After disconnecting the air supply, squeeze the Trigger (#2) to make sure no air
remains in the unit.
1. Place a wrench (not included) on the flats of the Spindle (#24) to hold it in place.
2. Using the Hex Wrench (#35), loosen and remove the Locking Nut (#36) and the
Spacer (#37).
3. Remove and replace the Cutting Wheel (#28).
4. Replace the Locking Nut (#36) and the Spacer (#37). Tighten the Locking Nut (#36)
while holding the Spindle (#24) in place with a wrench.
See FIGURE 1.
Warning! The Guard (#26)
must be in place when using
the High Speed Cutter.
Spindle (#24)
HexWrench (#35)
FIGURE 1
Locking Nut (#36)
Spacer (#37)
CuttingWheel (#28)
Guard (#26)
Trigger (#2)

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Operation (continued)
Warning!! Always check the cutting wheel for possible wear. Do no use a worn, torn, or
defective cutting wheel.
Warning!! Position the High Speed Cutter so that the attached guard is in position between
you and the workpiece to protect you from flying debris.
Warning!! Guard (#26) must always be attached to High Speed Cutter.
1. Check the CuttingWheel (#28) for wear. Replace if necessary.
2. Set the compressor to 90 PSI. Do not exceed 90 PSI.
3. Connect the Cutter to the air hose as explained on the top of page 5.
4. Using both hands to grip the Cutter, gently squeeze down on the Trigger (#2). Allow the
cutter to run for a few seconds before approaching the workpiece.
5. Let the Cutter do the work. Do not apply force on the workpiece.
6. When finished, release the Trigger (#2).
7. Disconnect the air hose.
8. Gently squeeze down on the Trigger (#2) to release any air that might still remain in the
Cutter.
Maintenance
Warning! Always disconnect the air supply before attempting any maintenance.
After disconnecting the air supply, squeeze the Trigger (#2) to make sure no air remains in
the unit.
1. After each use, wipe down the Cutter with a lint free cloth. Do not use solvents or harsh
detergents to clean the Cutter.
2. Make sure the Air Inlet (#30) is clean of dirt, grease, or debis.
3. Check the condition of the Cutting Wheel (#28) before each use. Replace if necessary.

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NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
PLEASE READTHE FOLLOWING CAREFULLY
THEMANUFACTURERAND/OR DISTRIBUTORHASPROVIDEDTHEPARTSDIAGRAMINTHIS
MANUAL AS A REFERENCETOOLONLY. NEITHERTHEMANUFACTURERNORDISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KINDTOTHE BUYERTHAT 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/ORDISTRIBUTOREXPRESSLYSTATESTHATALLREPAIRS ANDPARTSREPLACEMENTS
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSEDTECHNICIANS AND NOT BYTHE
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
OUTOF HIS ORHER INSTALLATIONOF REPLACEMENTPARTSTHERETO.
Parts List
Part No. Description Qty. Part No. Description Qty.
1 Housing 1 20 0-ring 1
2 Trigger* 1 21 Front Plate 1
3 Pin 1 22 Bearing 2
4 Valve Stem 1 23 Ball 1
5 Spring 1 24 Spindle 1
6 Valve Plug 1 25 Retainer 1
7 Air Regulator 1 26 Guard 1
8 Valve Bushing 1 27 Nut 1
9 0-ring 1 28 CuttingWheel ** 1
10 0-ring 1 29 Muffler Cover 1
11 0-ring 1 30 Air Inlet 1
12 0-ring 1 31 Lever* 1
13 Bearing 1 32 Pin* 1
14 End Plate 1 33 Spring* 1
15 Rotor 1 34 Washer 1
16 Rotor Blade 4 35 Hex Wrench 1
17 Cylinder 1 36 Locking Nut 1
18 Washer 1 37 Spacer 1
19 Washer 1
* Note: Numbers2, 31, 32,33 areall included whenordering partnumber2. They cannot beordered
separately.
** Note: Replacementcutting wheelsold in 10pack: Item 1103- 3”Cut-OffWheel (10 pack)
Item 44812 - 3”Cut-OffWheel for Metal Cutting (10 pack)
REV 06/04 REV 02/05

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Assembly Drawing
36
37
#35 Hex Wrench not shown

90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection veries the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specic legal rights and you may also have other rights which vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]