1. Maintenance 1.1 Diagnosis and troubleshooting 1.1.1 Start problems 5 1. The starter motor fails to work. Check Causes Remedies Battery The battery terminal post is loose. There is bad connection caused by oxidation or corrosion. Clean and/or tighten the loose terminal post(s) The battery is uncharged or in shortage of charge. Charge the battery or replace the old battery with a new one The belt of fan is loose or broken. Adjust the belt of fan, or replace it Fuse The fuse is short circuited. Replace the fuse with a new one Starter switch The starter switch or relay has failed. Replace the starter switch or relay Starter motor The solenoid switch has failed.
Repair or replace the solenoid switch The starter motor has failed. Repair or replace the starter motor 2. The starter motor works well, but the engine fails to run. Battery The battery terminal post is loose. There is bad connection caused by oxidation or corrosion. Clean and/or tighten the loose battery terminal post(s) The battery is uncharged or in shortage of charge. Charge the battery or replace the old battery with a new one The belt of fan is loose or broken. Adjust the belt of fan, or replace it Starter motor The pinion is broken. Replace the broken pinion The solenoid switch has failed. Repair or replace the solenoid switch The brush is worn or the brush spring is too soft.
Replace the brush and/or the brush spring Engine The piston or crankshaft bearing is jammed or damaged. Repair or replace the damaged part(s) 3. The engine rotates but it cannot be ignited to start. Check Causes Remedies Brake mechanism of engine The fuel cut-off solenoid valve is broken. Replace the fuel cut-off solenoid The fuel fails to flow into the injection pump. Fuel The fuel tank is empty. Fill in the fuel tank Fuel pipe system The fuel pipe is clogged or broken. The fuel tube joint is loose. Repair or replace the fuel pipe Retighten the fuel tube joint Fuel filter The fuel filter overflow valve cannot be closed. Repair or replace the fuel filter overflow valve