Harbor Freight Tools 68306, 68120 Use Engine will not start Compression Related section

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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.

 

SAFETY

 

4.

Old or low quality gasoline.

4.

Use only fresh 87+ octane

 

 

 

 

 

 

 

 

unleaded gasoline.

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

5.

Incorrect compression.

5.

Diagnose and repair compression.

 

 

 

 

 

 

(Use Engine will not start:

 

 

 

 

 

 

COMPRESSION RELATED section.)

 

 

Engine stops

1.

Low oil shutdown.

1.

Fill engine oil to proper level. Check

 

 

suddenly

 

 

 

engine oil before EVERY use.

 

 

 

 

 

 

 

2.

Fuel tank empty or full of impure or low

2.

Fill fuel tank with fresh 87+ octane

 

 

 

 

 

 

quality gasoline.

 

unleaded gasoline.

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

3.

Defective fuel tank cap creating

3.

Test/replace fuel tank cap.

 

SETUP

 

 

vacuum, preventing proper fuel flow.

 

 

 

 

 

 

 

 

 

 

4.

Faulty magneto.

4.

Have qualified technician service magneto.

 

 

 

5.

Disconnected or improperly

5.

Secure spark plug cap.

 

 

 

 

connected spark plug cap.

 

 

 

 

Engine stops when

1.

Dirty air filter

1.

Clean or replace element.

 

 

under heavy load

2. Engine running cold.

2.

Allow engine to warm up prior

 

 

 

 

 

 

to operating equipment.

 

 

Engine knocks

1.

Old or low quality gasoline.

1.

Fill fuel tank with fresh 87+ octane

 

 

 

 

 

 

unleaded gasoline.

 

 

 

 

 

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

2.

Engine overloaded.

2.

Do not exceed equipment’s load rating.

 

OPERATION

 

3.

Incorrect spark timing, deposit

3.

Have qualified technician

 

 

 

 

 

 

buildup, worn engine, or other

 

diagnose and service engine.

 

 

 

 

mechanical problems.

 

 

 

 

Engine backfires

1.

Impure or low quality gasoline.

1.

Fill fuel tank with fresh 87+ octane

 

 

 

 

 

 

unleaded gasoline.

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

2.

Engine too cold.

2.

Use cold weather fuel and oil

 

 

 

 

 

 

additives to prevent backfiring.

 

 

 

3.

Intake valve stuck or overheated engine.

3.

Have qualified technician

 

 

 

 

 

 

diagnose and service engine.

 

 

 

4.

Incorrect timing.

4.

Check engine timing.

 

 

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

MAINTENANCE

Horizontal Engines

For technical questions, please call 1-800-520-0882.

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Contents Save this Manual Email our technical support at predator@harborfreight.comTable of Contents RPM Symbol DefinitionsYOU in Minutes Set up PrecautionsOperating Precautions Carbon Monoxide Hazard Using an engine indoors can KillRefueling Service PrecautionsDo not Overfill To Prevent Serious Injury Battery Setup InstructionsEngine on a Vehicle Serial Number Location Engine SwitchEngine Controls Starter Handle Muffler DipstickChecking and Filling Engine Oil Pre-Start ChecksChecking and Filling Fuel Starting the EngineInjury from Fire Manual Start Turn the Engine Switch onBreak-in Period Stopping the EngineStart Turn the Engine Switch to StartOFF To Prevent Serious Injury from Accidental Starting Cleaning, Maintenance, and Lubrication ScheduleTo Prevent Serious Injury from Equipment Failure Engine Oil Change Brand Air Filter Element MaintenanceCleaning Spark Plug Maintenance CapStorage Do not use gasoline with more than Troubleshooting10% ethanol E15, E20, E85, etc Use Engine will not start Compression Related section Emission Control System Warranty Limited 90 Day WarrantyManufacturer’s Warranty Coverage Please Read the Following Carefully Record Product’s Serial Number Here 68120 212cc Parts List0882 68120 212cc AssemblyDiagram Call68121 212cc Parts List 68121 212cc Assembly Diagram 68136 346cc Parts List 68136 346cc Assembly Diagram68306 420cc Parts List 68306 420cc AssemblyFor technical questions, please call Horizontal Engines Mounting Hole DiagramsItem 68120 / 68121 212cc Item 68136 346cc and Item 68306 420cc16-24UNF Power Take-Off DiagramsMission Oaks Blvd. PO Box 6009 Camarillo, CA 93011 800

68306, 68120 specifications

Harbor Freight Tools is known for offering a wide range of tools and equipment at competitive prices, making it a favored choice for DIY enthusiasts and professionals alike. Among their extensive catalog, the 68120 and 68306 models stand out for their performance and versatility.

The Harbor Freight Tools 68120 is a 1,000-pound capacity engine hoist designed for lifting heavy engines and machinery with ease. One of its main features is its compact design, which allows for great maneuverability in tight spaces. The hoist operates on a hydraulic system, providing smooth lifting capabilities that ensure safety and reliability. The adjustable boom extends from 45 to 70 inches, enabling users to reach a variety of engine positions without hassle.

Additionally, the 68120 boasts a sturdy steel construction that adds to its durability and longevity. It also includes oversized wheels, making it effortless to move around the garage or shop without damaging floors. A safety latch is integrated into the main boom, which secures loads during operation, providing peace of mind to the user. The hoist is designed with efficiency in mind, enabling users to complete tasks more quickly and effectively.

The 68306 model is a pneumatic tire changer, specifically designed for hassle-free tire changing on various vehicles. This tool features an impressive range of compatibility, accommodating tires from 10 to 21 inches in diameter. The robust construction includes heavy-duty steel components, ensuring that it can withstand the rigorous demands of repeated use in a busy workshop or in mobile situations.

One of the standout features of the 68306 is its pneumatic operation, which allows for quick and effortless tire mounting and demounting. The user-friendly design includes an adjustable arm for varying tire widths, ensuring versatility for different vehicle types. Moreover, the incorporated bead breaker makes it easy to separate tires from their wheels without exerting excessive force.

In summary, both the Harbor Freight Tools 68120 and 68306 provide exceptional value for users seeking reliable, efficient, and robust tools to enhance their automotive repairs. With their advanced features and durable designs, they exemplify the high-quality offerings available from Harbor Freight, catering to both casual and professional users. Whether you need to lift heavy engines or change tires quickly, these tools stand ready to deliver performance and convenience.
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