Harbor Freight Tools 62365 User Manual - Page 22
Troubleshooting
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Safety Setup Troubleshooting Problem Possible Causes 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. Carburetor not primed. 5. Dirty fuel passageways blocking fuel flow. 6. Carburetor needle stuck. Fuel can be smelled in the air. 7. Too much fuel in chamber. This can be caused by the carburetor needle sticking. Trencher loses performance IGNITION (SPARK) RELATED: 1. Spark Plug Cap not connected securely. 2. Spark Plug electrode wet or dirty. 3. Incorrect Spark Plug Gap. 4. Spark Plug Cap broken. 5. Incorrect spark timing or faulty ignition system. COMPRESSION RELATED: 1. Cylinder not lubricated. Problem after long storage periods. 2. Loose or broken Spark Plug. (Hissing noise will occur when trying to start.) 3. Loose Cylinder Head or damaged Head Gasket. (Hissing noise will occur when trying to start.) 4. Engine valves or tappets mis‑adjusted or stuck. 1. Mushy hydraulic operation. 2. Oil Leaks. Probable Solutions FUEL RELATED: 1. Fill fuel tank and open fuel valve. 2. Move choke to start position if engine is cold. 3. Use only fresh 87+ octane unleaded gasoline. 4. Prime Carburetor by pressing priming bulb (if equipped). 5. Clean out passageways using fuel additive. Heavy deposits may require further cleaning. 6. Gently tap side of Carburetor float chamber with screwdriver handle. 7. Turn Fuel Valve to its off position. Turn choke to run position. Remove spark plug and pull the start handle several times to air out the chamber. Reinstall spark plug and set choke to start position. IGNITION (SPARK) RELATED: 1. Connect Spark Plug Cap properly. 2. Clean Spark Plug. 3. Correct Spark Plug Gap. 4. Replace Spark Plug Cap. 5. Have qualified technician diagnose/ repair ignition system. COMPRESSION RELATED: 1. Pour tablespoon of oil into spark plug hole. Crank engine a few times and try to start again. 2. Tighten Spark Plug. If that does not work, replace spark plug. If problem persists, may have head gasket problem, see #3. 3. Tighten head. If that does not remedy problem, replace head gasket. 4. Have qualified technician adjust/ repair valves and tappets. 1. Bleed hydraulic system. Replace hydraulic filter/clean strainer. 2. Tighten/replace hose. Follow all safety precautions whenever diagnosing or servicing the equipment or engine. Operation Maintenance Page 22 For technical questions, please call 1-888-866-5797. Item 62365