Gas Handheld Cut-Off Saw 66753 Set up, Operating, and Servicing Instructions Using an engine indoors CAN KILL YOU IN MINUTES. Engine exhaust contains carbon monoxide. This is a poison you cannot see or smell. NEVER use inside a home or garage, EVEN IF doors and windows are open. Only use OUTSIDE and far away from windows, doors, and vents. Distributed exclusively by Harbor Freight Tools®. 3491 Mission Oaks Blvd., Camarillo, CA 93011 Visit our website at: http://www.harborfreight.
Contents Important SAFETY Information ���������������������������� 3 Cut-Off Saw Safety Precautions ��������������������������� 5 Vibration Hazard: ������������������ 7 Parts Lists and DIAGRAMS � 21 Drive System Parts List & Diagram �������������������������������������� 21 Blade Guard Assembly Parts List & Diagram ������������� 22 Flange Assembly Parts List & Diagram ����������������������������������� 23 Specifications �������������������������� 9 Clutch Assembly Parts List & Diagram �����������������
Save This Manual NOTICE is used to address practices not related to personal injury. Keep this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the manual near the assembly diagram (or month and year of purchase if product has no number). Keep this manual and the receipt in a safe and dry place for future reference.
5. Wear ANSI-approved safety goggles, heavy-duty work gloves, and dust mask/respirator during set up. 6. Use only oil and fuel recommended in the “Specifications” section of this manual. Operating precautions 1. Carbon Monoxide Hazard Using an engine indoors CAN KILL YOU IN MINUTES. Engine exhaust contains carbon monoxide. This is a poison you cannot see or smell. 5. People with pacemakers should consult their physician(s) before use.
13. Do not cover the engine or equipment during operation. 14. Keep the equipment, engine, and surrounding area clean at all times. 15. Use the equipment, accessories, etc., in accordance with these instructions and in the manner intended for the particular type of equipment, taking into account the working conditions and the work to be performed. Use of the equipment for operations different from those intended could result in a hazardous situation. 21. Use the correct equipment for the application.
press against the Saw Blade to stop it. 9. Do not force the Saw Blade into the workpiece when cutting. Apply moderate pressure, allowing the Saw Blade to cut without being forced. 10. To avoid accidental injury, always wear heavy duty work gloves when changing the Saw Blade. 11. The Saw Blade will become hot while cutting. Allow the Saw Blade to completely cool before handling. 12.
• Do not use a dull or damaged Saw Blade. Unsharpened or improperly installed Saw Blades produce a narrow cut causing excessive friction, Saw Blade binding and kickback. • Push the Saw Blade past the workpiece prior to release. • Make sure to check the Blade Guard for proper operation. Never disable the Guard. Do not use the Cut Off Saw if the Guard assembly does not operate properly. Before each use, make sure the Blade Guard does not touch the Saw Blade.
4. Wear ANSI-approved safety goggles, heavy-duty work gloves, and dust mask/respirator during service. 5. Maintain labels and nameplates on the equipment. These carry important information. If unreadable or missing, contact Harbor Freight Tools for a replacement. 6. Have the equipment serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the equipment is maintained.
Specifications Type Engine Rating Start Bore x Stroke Compression Ratio Displacement Sound Level Type Fuel Spark Plug Speed Blade (not included) Fuel/Oil Ratio Capacity Type Gap Idle No Load Size Arbor Max. Cutting Depth Belt Air Filter 2 Stroke, air cooled 4.7 horsepower Recoil 1.89” x 1.34” 7.5:1 61.5 cc 105 dB @ 3 ft. 90+octane unleaded gasoline/2-cycle oil 40:1 0.7 L (0.18 Gallons) NGK - BPMR7A TORCH - L6RTC 0.02” (0.5mm) 2600 RPM 9500 RPM 14” dia.
Set Up Instructions Assembly Read the entire Important Safety Information section at the beginning of this manual including all text under subheadings therein before set up or use of this product. To prevent serious injury from accidental starting: Turn the Power Switch of the equipment to its “OFF” position, wait for the engine to cool, and disconnect the spark plug wire(s) before assembling or making any adjustments to the equipment.
Abrasive Blade Ring Test Installing the Blade Closely inspect the blade before mounting. Perform a ring-test on the blade as follows: 1. Suspend the blade using a pin or finger through the arbor hole. 45° Hang Wheel from Pin Figure 3 Arbor (13C) (not shown) Figure 4 1. Loosen and remove the Hex Bolt (20C). Then, remove the Outside Flange (5B). 2. The Inner Flange must be oriented so that it matches perfectly with the arbor hole of the blade (one side is 1” and the other side is 20 mm). 3.
Filling the Fuel Tank 3. WARNING! To prevent serious injury from fire: Mix the fuel (see below) and fill the fuel tank in a well-ventilated area away from ignition sources. Do not smoke. WARNING! Your Warranty is voided if: You do not operate the Cut Off Saw with the proper 40:1 fuel mix in its Fuel Tank. Never run the Engine with an improper fuel mix, low or no fuel mix. Running the Engine with an improper fuel mix, low or no fuel mix will permanently damage the unit.
1. Turn ON the ON/OFF Switch (14G). 2. If the engine is cold, pull out the Choke (6H). If the engine is warm, press in the Choke. 3. Hold the Trigger Safety Lever in using your palm, squeeze the Trigger (7F) and then press in the Trigger Locking Button (see Figure 1, page 9 for location of controls). Release the Trigger, then release the Trigger Locking Button and the Trigger Safety Lever. The Trigger should remain locked in the engaged position. 4. Press in the Decompression Valve (13K). 5.
Cutting Technique Cut Figure 7 Supports 7. To avoid kickback, never cut with the upper section of the blade - See Figure 7. Figure 5 1. Support the material being cut so that the cut will open up as the cut is made, rather than pinch together. 8. Abrasive Blades are not intended for use with water. 2. Always cut at full throttle. 9. 3. Start cutting gently, do not force or squeeze the blade into the material or the groove of the cut. When cutting concrete always use the water cooling system.
Servicing To prevent serious injury from accidental starting: Turn the Power Switch of the equipment to its “OFF” position, wait for the engine to cool, and disconnect the spark plug wire(s) before performing any inspection, maintenance, or cleaning procedures. To prevent serious injury from equipment failure: Do not use damaged equipment. If abnormal noise, vibration, or excess smoking occurs, have the problem corrected before further use.
Air Filter Element Maintenance and mild detergent several times. Rinse thoroughly. Squeeze out excess water and allow it to dry completely. Soak the filter in lightweight oil briefly, then squeeze out the excess oil. Air Filter Covers (1G/5G) Paper Filter (12G) 5. Install the new filters or the cleaned filters. Secure the Air Filter Cover before use. Spark Plug Maintenance 0.02” Foam Filter (4G) Figure 9 Filter Screen (13G) 1. Wipe off the Air Filter Covers (1G/5G). 2.
c. If the white insulator is cracked or chipped, the spark plug needs to be replaced. 4. 5. 6. When installing a new spark plug, adjust the plug’s gap to the specification on the Technical specification chart. Do not pry against the electrode or the insulator, the spark plug can be damaged. Install the new spark plug or the cleaned spark plug into the engine. Gasket-style: Finger-tighten until the gasket contacts the cylinder head, then about 1/2-2/3 turn more.
Cleaning, Maintenance, and Lubrication Schedule Note: This maintenance schedule is intended solely as a general guide. If performance decreases or if equipment operates unusually, check systems immediately. The maintenance needs of each piece of equipment will differ depending on factors such as duty cycle, temperature, air quality, fuel quality, and other factors. If you have doubts about your ability to safely service this tool, have a qualified technician service the equipment instead. Storage 1.
Troubleshooting Engine will not start Fuel Related: 1. No fuel in tank or fuel valve closed. 2. Choke not in start position, especially with cold engine. 3. Low quality or deteriorated, old gasoline. 4. Dirty fuel passageways blocking fuel flow. 5. Carburetor needle stuck. Fuel can be smelled in the air. 6. Too much fuel in chamber. This can be caused by the carburetor needle sticking. Ignition (spark) Related: 1. Spark plug wire disconnected or not connected securely. 2. Spark plug electrode wet or dirty.
Troubleshooting (continued) Problem Engine misfires Engine stops suddenly Possible Causes 1. Spark plug wire loose. 2. Incorrect spark plug gap or damaged spark plug. 3. Defective spark plug wire. 4. Old or low quality gasoline. 1. Fuel tank empty or full of impure or low quality gasoline. Engine knocks Engine backfires Saw Blade not rotating up to full speed. Poor quality of cut. Probable Solutions 1. Check wire connections. 2. Re-gap or replace spark plug. 3. Replace spark plug wire. 4.
PLEASE READ THE FOLLOWING CAREFULLY The manufacturer and/or distributor has provided the parts list and assembly diagram in this manual 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.
Blade Guard Assembly Parts List & Diagram Part 1B 2B 3B 4B 5B Description Washer Washer Washer Guard Flange Outside Flange Qty 1 1 2 1 1 Part 6B 7B 8B 9B 10B Description Inside Flange Blade Guard Adjustment Handle Spacer Bolt Qty 1 1 1 2 2 Note: When ordering parts for this component use the suffix “B”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. SKU 66753 For technical questions, please call 1-800-444-3353.
Flange Assembly Parts List & Diagram Part 1C 2C 3C 4C 5C 6C 7C 8C 9C 10C 11C Description Hex Flange Bolt Cutting Arm Clamp Ball Bearing Bushing Belt Tensioner Spacer Screw Bracket Bolt Rubber Washer Qty 3 1 2 2 2 1 1 1 1 1 1 Part 12C 13C 14C 15C 16C 17C 18C 19C 20C Bolt Arbor Spring Spacer Bolt Pulley Washer Nut Hex Bolt Description Qty 1 1 4 4 4 1 1 1 1 Note: When ordering parts for this component use the suffix “C”.
Clutch Assembly Parts List & Diagram Part 1D 2D 3D Description Spacer Bushing Clutch Drum Qty 1 1 1 Part 4D 5D Description Clutch Washer Centrifugal Clutch Assembly Qty 1 1 Note: When ordering parts for this component use the suffix “D”.
Control System Parts List & Diagram Part 1F 2F 3F 4F 5F 6F 7F 8F 9F 10F 11F Description Bolt1 Washer Handle Support Screw Front Vibration Isolator Rear Vibration Isolator Trigger Throttle Spring Piece Trigger Safety Lever Throttle Catch Spring Left Handle Cover Qty 4 4 1 2 4 2 1 1 1 1 1 Part 12F 13F 14F 15F 16F 17F 18F 19F 20F 23F Description Screw Tank Complete Fuel Line Tank Vent Fuel Filter Gas Cap O-Ring Pot Hook Fuel Line Clamp Gas Cap Complete Qty 2 1 1 1 1 1 1 1 1 1 Note: When ordering parts
Air Filter Assembly Parts List & Diagram Part 1G 2G 3G 4G 5G 6G 7G 8G Description Front Air Filter Cover Washer Bolt Foam Filter Air Filter Cover Washer Bolt Seal Qty 1 1 1 1 1 6 3 1 Part 9G 10G 11G 12G 13G 14G 17G Description Air Filter Base Bolt Seal Paper Filter Filter Screen ON/OFF Switch Grommet Qty 1 3 1 1 1 1 1 Note: When ordering parts for this component use the suffix “G”.
Carburetor Assembly Parts List & Diagram Part 1H 2H 3H 4H 5H 6H Description Rubber Seal Intake Manifold Bolt Gasket Breather Hose Choke Qty 1 1 2 1 1 1 Part 7H 8H 9H 10H 11H Description Carburetor Assembly Throttle Linkage Holder Throttle Bushing Throttle Rod Throttle Spring Qty 1 1 1 1 1 Note: When ordering parts for this component use the suffix “H”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.
Recoil Assembly Parts List & Diagram Part 1I 2I 3I 4I 5I 6I 7I 8I Description Washer Bolt Air Conductor Starter Cover Recoil Spring Mount Screw Recoil Spring Starter Pulley Qty 4 4 1 1 1 4 1 1 Part 9I 10I 11I 12I 13I 15I 16I Description Washer Bolt Starter Rope Baffle Starter Handle Starter Assembly Recoil Assembly Qty 1 1 1 1 1 1 1 Note: When ordering parts for this component use the suffix “I”.
Ignition Assembly Parts List & Diagram Part 1J 2J 3J 4J Description Flywheel Assembly Washer Washer Nut Qty 1 1 1 1 Part 5J 6J 7J 8J Description Ignition Assembly Washer Washer Bolt Qty 1 2 2 2 Note: When ordering parts for this component use the suffix “J”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. SKU 66753 For technical questions, please call 1-800-444-3353.
Cylinder Assembly Parts List & Diagram Part 1K 2K 3K 4K 5K 6K 7K Description Cylinder Washer Bolt Spark Plug Intake Manifold Clamp Cylinder Breather Hose Qty 1 4 4 1 1 1 1 Part 8K 9K 10K 11K 12K 13K 14K Description Holder Washer Bolt Bolt Gasket Decompression Valve Spring Qty 1 3 2 1 1 1 1 Note: When ordering parts for this component use the suffix “K”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.
Muffler Assembly Parts List & Diagram Part 1L 2L 3L 4L Holder Washer Washer Bolt Description Qty 1 3 2 3 Part 5L 6L 7L 8L Deflector Muffler Bolt Gasket Description Qty 1 1 2 1 Note: When ordering parts for this component use the suffix “L”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. SKU 66753 For technical questions, please call 1-800-444-3353.
Crankshaft Assembly Parts List & Diagram Part 1M 2M 3M 4M Description Wrist Pin Retaining Ring Woodruff Key Piston Qty 1 2 1 1 Part 5M 6M 7M Description Piston Ring Crankshaft Assembly Needle Bearing Qty 2 1 1 Note: When ordering parts for this component use the suffix “M”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. SKU 66753 For technical questions, please call 1-800-444-3353.
Crankcase Assembly Parts List & Diagram Part 1N 2N 3N 4N 5N 6N 7N Description Gasket Crankcase Left Cover Seal Crankcase Ball Bearing Washer Bolt Qty 1 1 1 1 2 7 2 Part 8N 9N 10N 11N 12N 13N 14N Description Bolt Bolt Guide Pin Crankcase Right Grommet Stud Bolt Seal Qty 4 1 2 1 1 2 1 Note: When ordering parts for this component use the suffix “N”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.
Wet Cutting Kit Parts List & Diagram Part 1O 2O 3O Description Bolt Washer Water Valve Tubing Qty 1 1 1 Part 4O 5O Description Qty Tie Wrap Quick Connect Hose Fitting 1 1 5 Note: When ordering parts for this component use the suffix “O”. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. Record Product’s Serial Number Here: Note: If product has no serial number, record month and year of purchase instead.
LIMITED 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.
completed in a reasonable amount of time, not to exceed 30 days. If you have any questions regarding your warranty rights and responsibilities, you should contact the Harbor Freight Tools Customer Service Department at 1-800-444-3353. Harbor Freight Tools Emission Control Defects Warranty Provisions 1.