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173cc 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.
Only use OUTSIDE
NEVER use inside
and far away from
a home or garage,
windows, doors,
EVEN IF doors and
and vents.
windows are open.
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.
Record Product
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Specifications Engine Type Vertical Single Cylinder 4 stroke OHV Cooling System Forced air cooled Type 87+ octane unleaded gasoline Fuel Capacity 1.16 Quarts 10W-30 above 32° F Type SAE 5W30 at 32° F or below Engine Oil Capacity 0.6 Quart Run Time @ 50% Load 40 minutes with full tank Sound Level 104 dB Bore x Stroke 70 mm x 45 mm Displacement 173cc Compression Ratio 8.5:1 Rotation viewed from PTO Counterclockwise (power takeoff - the output shaft) Shaft dia. 7/8” x 3.16” Shaft Keyway 3/16”
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Save This Manual Symbol Definitions Keep this manual for the safety warnings and precautions, Symbol Property or Statement assembly, operating, inspection, maintenance and cleaning procedures. Write the product’s serial Revolutions Per Minute RPM number in the back of the manual near the assembly diagram (or month and year of purchase if product Horsepower HP has no number). Keep this manual and the receipt in a safe and dry place for future reference. WARNING marking concerning Risk of
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Set up Precautions Operating Precautions 1. Gasoline fuel and fumes are flammable, and 1. CARBON MONOXIDE HAZARD potentially explosive. Use proper fuel storage Using an engine indoors CAN KILL and handling procedures. Do not store fuel YOU IN MINUTES. or other flammable materials nearby. Engine exhaust contains carbon monoxide. This is a poison you cannot 2. Have multiple ABC class fire extinguishers nearby. see or smell. 3. Operation of this equipment may create sparks that can start
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13. People with pacemakers should consult their 22. Keep the equipment, engine, and physician(s) before use. Electromagnetic fields surrounding area clean at all times. in close proximity to a heart pacemaker could 23. Use the equipment, accessories, etc., in accordance cause pacemaker interference or pacemaker with these instructions and in the manner intended for failure. Caution is necessary when near the particular type of equipment, taking into account the engine’s magneto or reco
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Do not attempt any service or maintenance procedures Service Precautions not explained in this manual or any procedures 1. Before service, maintenance, or cleaning: that you are uncertain about your ability to perform safely or correctly. THE ENGINE BRAKE IS FOR a. Release the brake handle, stopping the engine. EMERGENCY SHUTOFF; DO NOT REPLACE THE b. Allow the engine to completely cool. BRAKE SPRING WITH A WEAKER SPRING. c. Then, remove the spark plug 7. Store equipment out of the reach
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Engine Components Fuel Cap Priming Bulb Starter Handle Dipstick Muffler Air Filter Brake Arm Choke Serial Number Location (Write on front cover of manual.) Vertical Engine For technical questions, please call 1-800-520-0882. Page 7 XXXXXXXXXX
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4. Use 3/8” diameter, coarse threaded, hardened, Set Up stainless steel Bolts, Lock Washers, and Washers (not included) of appropriate length to secure the Engine to the mower. Model 68123: The emission control system for this Make sure the hardware does not engine is warranted for standards set by the U.S. contact moving parts. Environmental Protection Agency. For warranty information, refer to the last pages of this manual. 5. Insert the mower’s brake cable sheath through the Mode
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Checking and Filling Fuel Operation WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Read the ENTIRE IMPORTANT SAFETY Fill the fuel tank in a well-ventilated area away INFORMATION section at the beginning from ignition sources. If the engine is hot from of this manual including all text use, shut the engine off and wait for it to cool under subheadings therein before before adding fuel. Do not smoke. set up or use of this product. 1. Clean the Fuel Cap and the area around it. 2. Unscrew
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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. 1 2 2. If the engine is cold, adjust the Mower’s choke control to the CHOKE (START/CLOSED) position. 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
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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. 4 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 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. NO
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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. The engine may fail critically if n
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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. 6. Reinsert th
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Spark Plug Maintenance rust damage. Apply a thin coat of rust preventive oil to all metal parts. 2. FUEL: WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Spark Drain the fuel tank in a well-ventilated area Plug away from ignition sources. If the engine is Cap 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. Clean out
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Troubleshooting Problem Possible Causes Probable Solutions Engine will not start MOWER ENGINE SPECIFIC: MOWER ENGINE SPECIFIC: 1. Brake Handle not held or brake 1. Make sure brake handle is held down cable not connected properly. and brake cable is properly adjusted. 2. Mower on top of grass. 2. Start mower atop clear area free of loose objects and grass. FUEL RELATED: FUEL RELATED: 1. No fuel in tank. 1. Fill fuel tank. 2. Low quality or deteriorated, old gasoline. 2. Use fresh 87+ octane unl
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Problem Possible Causes Probable Solutions Engine misfires 1. Spark plug cap loose. 1. Check wire connections. 2. Incorrect spark plug gap or 2. Re-gap or replace spark plug. damaged spark plug. 3. Defective spark plug cap. 3. Replace spark plug cap. 4. Old or low quality gasoline. 4. Use only fresh 87+ octane unleaded gasoline. 5. Incorrect compression. 5. Diagnose and repair compression. (Use Engine will not start: COMPRESSION RELATED section.) Engine stops 1. Low oil shutdown. 1. Fill engi
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Emission Control System Warranties Warranty United States Emission Control Defects Limited 1 Year / 90 Day Warranty Warranty Statement Harbor Freight Tools Co. makes every effort to assure that (for Model 68123) its products meet high quality and durability standards, The United States Environmental Protection Agency (herein EPA) and warrants to the original purchaser that for a period of and Harbor Freight Tools (herein HFT) are pleased to explain the ninety days from date of purchase
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• You are responsible for shipping your engine to a HFT warranty d) Improper or inadequate maintenance of any warranted parts station as soon as a problem exists. Contact the HFT Customer e) Repairs performed outside of the authorized Service department at the number below to make shipping warranty service dealers arrangements. The warranty repairs should be completed f) Alterations by changing, adding to or in a reasonable amount of time, not to exceed 30 days. removing parts from the e
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Mounting Hole Diagram Note: Not to scale. A-A 2:1 1.1 in. / 28mm 0.98 in. / 25mm A 6*Ø0.35 in. / 9mm Ø0.24 in. / 6mm Ø8 in. / 203mm A Ø0.34 in. / 8.7mm A Ø1 in. / 25.4mm Ø0.24 in. / 6mm Ø0.34 in. A / 8.7mm 3.94 in. / 100mm 3.85 in. / 97.7mm Vertical Engine For technical questions, please call 1-800-520-0882. Page 19 Ø8mm 3.27 in. / 83mm
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68122 Parts List and Diagram Part Description Qty. Part Description Qty. 1 Cover, Cylinder Head 1 61 Plate Asm., Lifter Stopper 1 2 Gasket, Cylinder Head Cover 1 62 Lifter, Valve 2 3 Head Asm., Cylinder 1 63 Tappet, Valve 2 4 Gasket, Cylinder Head 1 64 Camshaft Asm. 1 5 Bolt 4 65 Valve, Exhaust 1 6 Plug, Spark 1 66 Starter Asm., Recoil 1 7 Bolt, Cylinder Head 4 67 Housing, Engine 1 8 Bracket, Muffler Shield 1 68 Shroud 1 9 Bolt 1 69 Nut 3 10 Stud 2 70 Stud 2 11 Pin 2 71 Stud 1 12 Crankcase Asm.
