0” 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.
SPECIFICATIONS Electrical Requirements Arbor Diameter Positive Stops Blade Diameter Cutting Capacity Features Accessories 120 V / 60 Hz / 4600 RPM 10.8 A Input Working Amperage (with load) 1-3/4 HP Motor / Single Phase 2-Prong Power Plug Double Insulated Motor w/ External Access Brushes 5/8” (0.625”) 0°, 15°, 22.
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.
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.
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.
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.
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.
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.
3. The smaller the gauge number of the wire, the greater the capacity of the cord. For example, a 14 gauge cord can carry a higher current than a 16 gauge cord. (See Table A.) 4. When using more than one extension cord to make up the total length, make sure each cord contains at least the minimum wire size required. (See Table A.) 5. If you are using one extension cord for more than one tool, add the nameplate amperes and use the sum to determine the required minimum cord size. (See Table A.) 6.
UNPACKING When unpacking, check to make sure all the parts shown on the Parts Lists on pages 22 and 23 are included. If any parts are missing or broken, please call Harbor Freight Tools at the number shown on the cover of this manual as soon as possible. ASSEMBLY AND Functions Note: For additional references to the parts listed in the following pages, refer to the Assembly Diagrams on pages 24 and 25.
ADJUSTING KNOB (102) WING SCREW (97) GUIDE FENCE (105) BAFFLE PLATE (151) FIGURE E WING SCREW (148) HOLDER (149) 3. A workpiece Clamp Assembly (95, 96, 97, 98, 99, 100, 101, 102) can be installed by inserting the Assembly into the hole located in the Guide Fence (105). Once inserted, lock the Assembly in place with a Wing Screw (97). To clamp the workpiece to the Base (147) of the Miter Saw, turn the Adjusting Knob (102) clockwise. (See Figure E.) 4.
FIGURE F Front Cover with Support Leg (117) 1/4” MOUNTING HOLE 3. 1/4” MOUNTING HOLE Use two C-clamps (not included) to secure the back side of the Miter Saw to the table/workbench. To Remove/Install A Saw Blade: WARNING! Prior to performing this procedure, make sure the Miter Saw is unplugged from its electrical outlet. When replacing a Saw Blade (51), make sure the new Saw Blade has a 10” diameter, rated to at least 4600 RPM, made to fit a 5/8” (0.
SAFETY COVER (58) FLAT HEAD SCREW (60) CENTER COVER (55) FIGURE H 2. Remove the Flat Head Screw (60) and Center Cover (55). (See Figure H.) SAFETY BUTTON (16) SWITCH LEVER (25) SHAFT LOCK (1) HANDLE COVER (40) SAFETY COVER (58) FIGURE I 3. Press in and hold the Shaft Lock (1) to keep the Spindle (35) from turning. (See Figure I.) 4. Use the accessory Hex Socket Wrench (150) to remove the Hex Flange Head Bolt (61). NOTE: To remove the Hex Flange Head Bolt (61), turn the Bolt CLOCKWISE.
FLANGE (52) HEX FLANGE HEAD BOLT (61) HEX SOCKET WRENCH (150) FLANGE (52) HEX FLANGE HEAD BOLT (61) FIGURE J SAW BLADE (51) BLADE CASE (43) ARROW ARROW FIGURE K 6. Remove the old Saw Blade (51). Then mount the new Saw Blade on the Spindle (35), making sure the arrow direction on the Saw Blade matches the arrow on the Blade Case (43). The teeth of the Saw Blade should point toward the rear of the Miter Saw. (See Figure K.) SKU 90891 For technical questions, please call 1-800-444-3353.
HEX FLANGE HEAD BOLT (61) SAW BLADE (51) SPINDLE (35) FLANGE (52) INNER FLANGE (65) FIGURE L . Insert the Flange (52) onto the Spindle (35) and against the Saw Blade (51). NOTE: Make sure the larger diameter side of the Flange is against the Saw Blade. (See Figure L.) 8. Press in and hold the Shaft Lock (1) to keep the Spindle (35) from turning. (See Figure I.) 9. Use the accessory Hex Socket Wrench (150) to tighten the Hex Flange Head Bolt (61) into the Spindle (35).
The Power Switch: Note: The Miter Saw can be disabled for safety purposes by removing the Safety Button (16). Make sure to store the Safety Button in a safe place, and do not lose it. The Miter Saw cannot be started without the Safety Button in place. (See Figure I.) 1. Before plugging in the Miter Saw, check the operation of the Safety Button (16) and the Switch Lever (25). Do not operate the Miter Saw if either the Safety Button or Switch Lever are not operating properly. (See Figure I.) 2.
HEX HEAD BOLT (71) MOTOR HOUSING (26) KERF BOARD (114) SAW BLADE (51) TURN BASE (125) FIGURE M 2. Push the Miter Saw’s Motor Housing (26) forward as far as it will go. Notice whether the edge of the Saw Blade (51) passes completely through the Kerf Board (114). (See Figure M.) 3. If the Saw Blade (51) does not pass completely through the Kerf Board (114), lower the Saw Blade slightly by turning the Hex Head Bolt (71) COUNTERCLOCKWISE. (See Figure M.) 4.
To Adjust The Miter Angle: WARNING! Prior to performing this procedure, make sure the Power Cord of the Miter Saw is unplugged from its electrical outlet. Knob (74) FASTEN KNOB (104) GUIDE FENCE (105) FIGURE N SCALE PLATE (141) TURN BASE (125) 1. The miter angle of a cut may be adjusted 0 - 45 degrees to the right or left. To do so, loosen the Fasten Knob (104) located on the Guide Fence (105). (See Figure N.) 2.
To Adjust The Support Screw: To Adjust The Bevel Angle: WARNING! Prior to performing this procedure, make sure the Power Cord of the Miter Saw is unplugged from its electrical outlet. 1. The Support Screw (138) ca adjusted by turning it clockw lengthen it or by turning it co clockwise to shorten it. 2. It should be adjusted so tha just above the surface of the bench the saw is mounted o FIGURE O ARM HOLDER (82) SCALE PLATE (89) LOCK HANDLE (59) Support Screw (138) 1.
Operation 1. Make sure the Power Cord of the Miter Saw is unplugged from its electrical outlet. Then, if necessary, make adjustments to the workpiece Holder (149), Baffle Plate (151), cutting depth, and miter angle and/or bevel angle. 2. Raise the Motor Housing (26) to its full “UP” position. 3. Check to make sure the Safety Button (16) and the Switch Lever (25) are operating properly. 4. Place the workpiece on the Turn Base (125) and against the Guide Fence (105). 5.
INSPECTION, MAINTENANCE, AND CLEANING WARNING! Always make sure the Switch Lever (25) is in its “OFF” position, and unplug the Power Cord from its 120 volt electrical outlet before performing any inspection, adjustments, maintenance, or cleaning. 1. Before each use, inspect the general condition of the Miter Saw.
PARTS LIST Torsion Spring Assy. * * Includes: #57 Spindle Sleeve and #58 Safety Cover. (Note: Customer must save old brass sleeve from old Safety Cover and use it when installing new #56 Torsion Spring Assembly). REV 05b SKU 90891 For technical questions, please call 1-800-444-3353.
PARTS LIST - CONTINUED REV 04d SKU 90891 For technical questions, please call 1-800-444-3353.
ASSEMBLY DIAGRAM 10 1 3 2 4 5 6 8 7 35 11 15 13 14 12 16 17 18 19 20 9 21 34 32 33 31 29 44 23 27 28 36 24 25 26 30 22 43 42 41 40 39 38 37 46 45 56 55 54 53 52 51 49 50 48 61 57 58 59 83 47 62 64 63 65 66 67 68 69 70 60 71 72 73 82 81 77 80 79 76 75 74 78 Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.
ASSEMBLY DIAGRAM - CONTINUED 84 85 86 87 88 89 90 138 137 136 135 134 91 92 93 94 95 96 97 99 98 100 102 101 109 110 133 103 111 112 132 104 113 105 114 131 130 154 129 106 108 107 115 116 128 127 126 125 124 117 123 122 121 120 119 118 153 152 151 150 149 148 147 146 145 144 143 142 141 Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.