10” COMPOUND SLIDE MITER SAW
Model 90891
Set up And Operating Instructions
Diagrams within this manual may not be drawn proportionally.
Due to continuing improvements, actual product may differ slightly from the product described herein.
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
Read this material before using this product. Failure to do so can result in serious injury. Save this manual.
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 or replacement parts, please call 1-800-444-3353.
Cover revised 07h
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SPECIFICATIONS |
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Electrical |
120 V / 60 Hz / 4600 RPM |
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Requirements |
10.8 A Input Working Amperage (with load) |
E105017 |
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1-3/4 HP Motor / Single Phase |
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2-Prong Power Plug |
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Double Insulated Motor w/ External Access Brushes |
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Arbor Diameter |
5/8” (0.625”) |
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Positive Stops |
0°, 15°, 22.5°, 30°, 45° Miter |
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0°, 45° Compound |
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Blade Diameter |
10”, 60 Tooth, C2 Carbide Tipped Blade |
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Cutting Capacity |
At 90 Degrees: 3-1/2” Deep x 12” Front to Back |
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At 45 Degrees: 1-3/4” Deep x 10” Front to Back |
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Features |
Trigger Safety Button |
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Transparent, Retractable, Blade Guard |
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Accessories |
Workpiece Holders (Qty. 2) |
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Hex Socket Wrench (Qty. 1) |
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Baffle Plate (Qty. 1) |
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Baffle Plate Screw (Qty. 1) |
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Carbon Brushes (Qty. 2) |
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Dust Collect Bag (Qty. 1) |
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SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning procedures, parts list and assembly diagram. Keep your invoice with this manual. Write the invoice number on the inside of the front cover. Keep this manual and invoice in a safe and dry place for future reference.
GENERAL SAFETY RULES
WARNING! Read all instructions
Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury. The term “power tool” in all of the warnings listed below refers to your mains-operated (corded) power tool or battery-operated
(cordless) power tool.
SAVE THESE INSTRUCTIONS
WORK AREA
1.Keep your work area clean and well lit. Cluttered benches and dark areas invite accidents.
REV 05i, 07h
SKU 90891 |
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2.Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks which may ignite the dust or fumes.
3.Keep bystanders, children, and visitors away while operating a power tool.
4.Distractions can cause you to lose control. Protect others in the work area from debris such as chips and sparks. Provide barriers or shields as needed.
ELECTRICAL SAFETY
1.Grounded tools must be plugged into an outlet properly installed and grounded in accordance with all codes and ordinances. Never remove the grounding prong or modify the plug in any way. Do not use any adapter plugs. Check with a qualified electrician if you are in doubt as to whether the outlet is properly grounded. If the tools should electrically malfunction or break down, grounding provides a low resistance path to carry electricity away from the user.
2.Double insulated tools are equipped with a polarized plug (one blade is wider than the other). This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install a polarized outlet. Do not change the plug in any way. Double insulation 
eliminates the need for the three wire grounded power cord and grounded power supply system.
3.Avoid body contact with grounded surfaces such as pipes, radiators, ranges, and refrigerators. There is an increased risk of electric shock if your body is grounded.
4.Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
5.Do not abuse the Power Cord. Never use the Power Cord to carry the tools or pull the Plug from an outlet. Keep the Power Cord away from heat, oil, sharp edges, or moving parts. Replace damaged Power Cords immediately. Damaged Power Cords increase the risk of electric shock.
6.When operating a power tool outside, use an outdoor extension cord marked “W-A” or “W”. These extension cords are rated for outdoor use, and reduce the risk of electric shock.
PERSONAL SAFETY
1.Stay alert. Watch what you are doing, and use common sense when operating a power tool. Do not use a power tool while tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
SKU 90891 |
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2.Dress properly. Do not wear loose clothing or jewelry. Contain long
hair. Keep your hair, clothing, and gloves away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts.
3.Avoid accidental starting. Be sure the Power Switch is off before plugging in. Carrying power tools with your finger on the Power Switch, or plugging in power tools with the Power Switch on, invites accidents.
4.Remove adjusting keys or wrenches before turning the power tool on. A wrench or a key that is left attached to a rotating part of the power tool may result in personal injury.
5.Do not overreach. Keep proper footing and balance at all times. Proper footing and balance enables better control of the power tool in unexpected situations.
6.Use safety equipment. Always wear eye protection. Dust mask, non-skid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.
TOOL USE AND CARE
1.Use clamps (not included) or other practical ways to secure and support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control.
2.Do not force the tool. Use the correct tool for your application. The correct tool will do the job better and safer at the rate for which it is designed.
3.Do not use the power tool if the Power Switch does not turn it on or off.
Any tool that cannot be controlled with the Power Switch is dangerous and must be replaced.
4.Disconnect the Power Cord Plug from the power source before making any adjustments, changing accessories, or storing the tool. Such preventive safety measures reduce the risk of starting the tool accidentally.
5.Store idle tools out of reach of children and other untrained persons. Tools are dangerous in the hands of untrained users.
6.Maintain tools with care. Keep cutting tools sharp and clean. Properly maintained tools with a sharp cutting edge are less likely to bind and are easier to control. Do not use a damaged tool. Tag damaged tools “Do not use” until repaired.
. Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the tool’s operation. If damaged, have the tool serviced before using. Many accidents are caused by poorly maintained tools.
SKU 90891 |
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8.Use only accessories that are recommended by the manufacturer for your model. Accessories that may be suitable for one tool may become hazardous when used on another tool.
SERVICE
1.Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury.
2.When servicing a tool, use only identical replacement parts. Follow instructions in the “Inspection, Maintenance, And Cleaning” section of this manual. Use of unauthorized parts or failure to follow maintenance instructions may create a risk of electric shock or injury.
SPECIFIC SAFETY RULES
1.Maintain a safe working environment. Keep the work area well lit. Make sure there is adequate surrounding workspace. Always keep the work area free of obstructions, grease, oil, trash, and other debris. Do not use the Miter Saw in areas near flammable chemicals, dusts, and vapors. Do not use this product in a damp or wet location.
2.Maintain labels and nameplates on the Miter Saw. These carry important information. If unreadable or missing, contact Harbor Freight Tools for a replacement.
3.Do not force the equipment. This Miter Saw will do the work better and safer at the speed and capacity for which it was designed.
4.Keep all guards in place and in working order.
5.Remove all adjusting wrenches from the Miter Saw before turning it on.
6.Do not abuse the Power Cord. Do not use the Power Cord to pull its Plug from an electrical outlet. Keep the Power Cord away from heat, oil, sharp edges, and moving parts. Route the Power Cord safely. Protect the Power Cord from being damaged by other equipment in the work area. Do not route the Power Cord where it can be walked on or tripped over. Replace a damaged Power Cord immediately.
. Make sure the Power Switch is in the “OFF” position before plugging in the
Power Cord.
8.Do not use this Miter Saw for cutting metals or brittle materials. Do not cut dangerous materials, such as asbestos which can cause harmful dust or vapors.
SKU 90891 |
For technical questions, please call 1-800-444-3353. |
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9.When replacing the Saw Blade, make sure the new Saw Blade has a diameter of 10”, has an RPM rating of at least 4600, and has an arbor hole of 5/8” diameter.
10.To avoid accidental injury, always wear heavy duty work gloves when changing a Saw Blade.
11.Before using the Miter Saw, make sure the Saw Blade is properly mounted on the Saw Spindle. Make sure the Saw Blade is balanced, and is not cracked or bent.
12.The Saw Blade will become hot while cutting. Allow the Saw Blade to completely cool before touching.
13.Allow the Saw Blade to spin up to full speed before feeding it into wood.
When turning off the Miter Saw, allow the Saw Blade to spin down and stop on its own. Do not press against the Saw Blade to stop it.
14.Do not force the material into the Saw Blade when cutting. Apply moderate pressure, allowing the Saw Blade to cut without being forced.
15.Never attempt to remove material stuck in the moving parts of the Miter Saw while the machine is plugged in and running.
16.Whenever possible, use clamps or other safe, practical ways to hold and support the workpiece. Do not attempt to cut material that does not have a flat surface, unless a suitable support is used.
1 . Turn off the Miter Saw and allow the Saw Blade to stop on its own if the
Saw Blade is to be backed out of an uncompleted cut.
18.Always keep hands and fingers away from the spinning Saw Blade.
19.Use eye, hearing, and breathing protection. Always wear ANSI approved safety impact eye goggles, hearing protectors, and dust masks or respirator when working with the Miter Saw.
20.Do not use this product if under the influence of alcohol or drugs. Read warning labels on prescriptions to determine if your judgement or reflexes are impaired while taking drugs. If there is any doubt, do not attempt to use this product.
21.Industrial applications must follow OSHA requirements.
22.Maintain this product with care. Keep the Miter Saw clean and dry for better and safer performance. For your safety, service and maintenance should be performed regularly by a qualified technician.
23.Use the right tool or attachment for the right job. Do not attempt to force a small tool or attachment to do the work of a larger industrial tool or attachment.
There are certain applications for which this product was designed. It will do the
SKU 90891 |
For technical questions, please call 1-800-444-3353. |
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job better and more safely at the rate for which it was intended. Do not modify this product, and do not use this product for a purpose for which it was not intended.
24.Always turn off the Miter Saw and unplug the Power Cord from its electrical outlet before changing accessories or performing any inspection, maintenance, or cleaning procedures.
25.WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities, contains 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.)
26.People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to heart pacemaker could cause pacemaker interference or pacemaker failure.
2 . The warnings, precautions, and instructions discussed in this manual cannot cover all possible conditions and situations that may occur. The operator must understand that common sense and caution are factors which cannot be built into this product, but must be supplied by the operator.
28.Only lock the Motor Housing in the lock down position for carrying or storing the Miter Saw. Never attempt to cut with the Miter Saw when the Motor Housing is in the lock down position.
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Grounding |
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Improperly connecting the grounding wire can result in |
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WARNING |
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electric shock. |
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Check with a qualified electrician if you are in doubt as to whether the outlet is properly grounded. Do not modify the power cord plug provided with the tool. Never remove the grounding prong from the plug. Do not use the tool if the power cord or plug is damaged. If damaged, have it repaired by a service facility before use. If the plug will not fit the outlet, have a proper outlet installed by a qualified electrician.
SKU 90891 |
For technical questions, please call 1-800-444-3353. |
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Grounded Tools: Tools with Three Prong Plugs
1.Tools marked with “Grounding Required” have a three wire cord and three prong grounding plug. The plug must be connected to a properly grounded outlet. If the tool should electrically malfunction or break down, grounding provides a low resistance path to carry electricity away from the user, reducing the risk of electric shock. (See 3-Prong Plug and Outlet.)
2.The grounding prong in the plug is connected through the green wire inside the cord to the grounding system in the tool. The green wire in the cord must be the only wire connected to the tool’s grounding system and must never be attached to an electrically “live” terminal. (See 3-Prong Plug and Outlet.)
3.The tool must be plugged into an appropriate outlet, properly installed and grounded in accordance with all codes and ordinances. The plug and outlet should look like those in the following illustration.
(See 3-Prong Plug and Outlet.)
3-Prong Plug and Outlet |
Outlets for 2-Prong Plug |
Double Insulated Tools: Tools with Two Prong Plugs
1.Tools marked “Double Insulated” do not require grounding. They have a special double insulation system which satisfies OSHA requirements and complies with the applicable standards of Underwriters Laboratories, Inc., the Canadian Standard Association, and the National Electrical Code.
(See Outlets for 2-Prong Plug.)
2.Double insulated tools may be used in either of the 120 volt outlets shown in the preceding illustration. (See Outlets for 2-Prong Plug.)
Extension Cords
1.Grounded tools require a three wire extension cord. Double Insulated tools can use either a two or three wire extension cord.
2.As the distance from the supply outlet increases, you must use a heavier gauge extension cord. Using extension cords with inadequately sized wire causes a serious drop in voltage, resulting in loss of power and possible tool damage.
(See Table A.)
SKU 90891 |
For technical questions, please call 1-800-444-3353. |
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