73cc Vertical Engine 68122 / 68123 173cc Vertical Engine 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. When unpacking, make sure that the product is intact and undamaged. If any parts are missing or broken, please call 1-800-520-0882 as soon as possible.
Specifications Engine Type Cooling System Type Capacity Fuel Type SAE Engine Oil Capacity Run Time @ 50% Load with full tank Sound Level Bore x Stroke Displacement Compression Ratio Rotation viewed from PTO Vertical Single Cylinder 4 stroke OHV Forced air cooled 87+ octane unleaded gasoline 1.16 Quarts 10W-30 above 32° F 5W30 at 32° F or below 0.6 Quart 40 minutes 104 dB 70 mm x 45 mm 173cc 8.5:1 Counterclockwise (power takeoff - the output shaft) Shaft dia. 7/8” x 3.16” Keyway Shaft 3/16” (4.
Save This Manual Symbol Definitions 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.
Set up Precautions Operating Precautions 1. Gasoline fuel and fumes are flammable, and potentially explosive. Use proper fuel storage and handling procedures. Do not store fuel or other flammable materials nearby. 1. 2. Have multiple ABC class fire extinguishers nearby. 3. Operation of this equipment may create sparks that can start fires around dry vegetation. A spark arrestor may be required.
13. People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to a heart pacemaker could cause pacemaker interference or pacemaker failure. Caution is necessary when near the engine’s magneto or recoil starter. 14. Use only accessories that are recommended by Harbor Freight Tools for your model. Accessories that may be suitable for one piece of equipment may become hazardous when used on another piece of equipment. 15.
Service Precautions 1. Before service, maintenance, or cleaning: a. Release the brake handle, stopping the engine. b. Allow the engine to completely cool. c. Then, remove the spark plug cap from the spark plug. 2. Keep all safety guards in place and in proper working order. Safety guards include muffler, air cleaner, mechanical guards, and heat shields, among other guards. 3. Do not alter or adjust any part of the equipment or its engine that is sealed by the manufacturer or distributor.
Engine Components Fuel Cap Priming Bulb Starter Handle Dipstick Muffler Air Filter Brake Arm Choke XXXXXXXXXX Serial Number Location (Write on front cover of manual.) Vertical Engine For technical questions, please call 1-800-520-0882.
Set Up Model 68123: The emission control system for this engine is warranted for standards set by the U.S. Environmental Protection Agency. For warranty information, refer to the last pages of this manual. Models 68122: The emission control system for this Generator’s Engine is warranted for standards set by the U.S. Environmental Protection Agency and by the California Air Resources Board (also known as CARB). For warranty information, refer to the last pages of this manual.
Checking and Filling Fuel Operation 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. Pre-Start Checks WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Fill the fuel tank in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before adding fuel. Do not smoke. 1. Clean the Fuel Cap and the area around it. 2.
Starting Note: Move the mower to a location that is flat, level, and free from loose objects (such as rocks or sticks). The mower may be difficult to start on grass. 1. Press the Priming Bulb 2-3 times to prime the engine. 2. If the engine is cold, adjust the Mower’s choke control to the CHOKE (START/CLOSED) position. 1 2 Note: Location, operation, and design of the choke control will vary from manufacturer to manufacturer. Adjust the control so that it pulls the choke cable to close the choke. 3 3.
4. Grip the Starter Handle of the Engine loosely and pull it gently until resistance is felt. Allow Cable to retract fully and then pull it quickly. Repeat until the engine starts. Note: Do not let the Starter Handle snap back against the engine. Hold it as it recoils so it doesn't hit the engine. 5. Allow the Engine to run for several seconds. Then, if the Mower’s choke control is in the CHOKE (START/CLOSED) position, move the choke control very slowly to its RUN (OPEN) position.
Service WARNING TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING: Release the brake handle, wait for the engine to cool, and disconnect the spark plug cap 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. Follow all service instructions in this manual.
Checking and Filling Fuel WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Fill the fuel tank in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before adding fuel. Do not smoke. 1. Clean the Fuel Cap and the area around it. 2. Unscrew and remove the Fuel Cap. Full level 3. If needed, fill the Fuel Tank to about 1 inch under the fill neck of the Fuel Tank with 87 octane or higher unleaded gasoline.
Spark Plug Maintenance rust damage. Apply a thin coat of rust preventive oil to all metal parts. 2. FUEL: Spark Plug Cap WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Drain the fuel tank in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before draining fuel. Do not smoke. a. Place a funnel leading to a proper gasoline container below the carburetor. 1. Disconnect spark plug cap from end of plug.
Troubleshooting Problem Engine will not start Possible Causes Probable Solutions MOWER ENGINE SPECIFIC: 1. Brake Handle not held or brake cable not connected properly. 2. Mower on top of grass. MOWER ENGINE SPECIFIC: 1. Make sure brake handle is held down and brake cable is properly adjusted. 2. Start mower atop clear area free of loose objects and grass. FUEL RELATED: 1. No fuel in tank. 2. Low quality or deteriorated, old gasoline. 3. Carburetor not primed. 4. Dirty fuel passageways.
Problem Engine misfires Engine stops suddenly Possible Causes Probable Solutions 1. Spark plug cap loose. 2. Incorrect spark plug gap or damaged spark plug. 3. Defective spark plug cap. 4. Old or low quality gasoline. 5. Incorrect compression. 1. Check wire connections. 2. Re-gap or replace spark plug. 1. Low oil shutdown. 1. Fill engine oil to proper level. Check engine oil before EVERY use. 2. Fill fuel tank with fresh 87+ octane unleaded gasoline. 3. Test/replace fuel tank cap. 2.
Emission Control System Warranty Warranties Limited 1 Year / 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 for a period of ninety days from date of purchase that the engine/motor, the belts (if so equipped), and the blades (if so equipped) are free of defects in materials and workmanship.
• You are responsible for shipping your engine to a HFT warranty station as soon as a problem exists. Contact the HFT Customer Service department at the number below to make shipping arrangements. The warranty repairs should be 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. d) e) f) 5.
Mounting Hole Diagram A-A 2:1 Note: Not to scale. 0.98 in. / 25mm A Ø8mm 1.1 in. / 28mm 6*Ø0.35 in. / 9mm Ø0.24 in. / 6mm Ø8 in. / 203mm 3.27 in. / 83mm A Ø0.34 in. / 8.7mm A Ø1 in. / 25.4mm Ø0.24 in. / 6mm Ø0.34 in. / 8.7mm A 3.94 in. / 100mm Vertical Engine 3.85 in. / 97.7mm For technical questions, please call 1-800-520-0882.
68122 Parts List and Diagram Part 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Page 20 Description Cover, Cylinder Head Gasket, Cylinder Head Cover Head Asm., Cylinder Gasket, Cylinder Head Bolt Plug, Spark Bolt, Cylinder Head Bracket, Muffler Shield Bolt Stud Pin Crankcase Asm. Shield, Crankcase Side Dipstick Asm.
68122 Parts List and Diagram 69 69 69 67 68 70 70 111 10 5 71 66 10 6 110 87 87 89 88 18 96 34 98 97 88 95 99 96 10 0 10 4 93 10 1 10 2 10 1 10 3 94 92 112 26 49 91 90 28 2930 32 31 45 96 34 27 12 46 86 22 23 24 33 25 14 47 87 20 20 21 19 15 17 16 15 13 85 10 9 10 7 10 8 116 113 50 11 4 8 11 49 55 10 6 1 7 5 7 55 10 3 2 5 5 5 54 53 7 72 73 53 74 54 75 76 74 57 57 118 119 115 63 65 62 63 43 62 35 59 36 56 78 37 39 40 36 80 82 38 83
68123 Parts List and Diagram Part 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Page 22 Description Cover, Cylinder Head Gasket, Cylinder Head Cover Head Asm., Cylinder Gasket, Cylinder Head Bolt Plug, Spark Bolt, Cylinder Head Bracket, Muffler Shield Bolt Stud Pin Crankcase Asm. Shield, Crankcase Side Dipstick Asm.
68123 Parts List and Diagram 67 67 67 65 66 68 68 94 10 0 69 64 95 99 98 96 97 20 20 21 19 15 16 15 13 86 86 93 18 92 85 43 10 1 26 8 11 53 6 7 10 3 2 5 52 54 70 71 51 72 52 73 74 72 55 10 8 10 4 61 63 60 61 41 60 33 57 34 54 76 37 38 34 35 78 80 36 81 82 77 42 75 39 40 40 Vertical Engine 10 7 10 3 56 57 59 51 7 5 5 53 55 10 6 10 9 49 46 58 47 10 50 62 9 7 7 10 2 48 11 4 5 10 5 47 87 1 91 28 29 30 32 31 12 44 84 88 89 90
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 520-0882 www.harborfreight.