TROUBLESHOOTING
F
2
ISSUE CAUSE ACTION
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N
G
I
N
E
The start motor does not rotate when
the key switch is turned
• PTO switch is on「ON」position
• Defective safety switch
• Battery discharged
• Loose terminal
• Faulty key switch
• Defective start motor
• Set PTO switch into「OFF」position
• Have it repaired or replaced by workshop
• Charge battery
• Check for looseness and corrosion
Clean, tighten and apply grease
• Have it repaired or replaced by workshop
• Have it repaired or replaced by workshop
The start motor runs, but its speed
cannot be increased
• Weak battery
• Poor ground
• Incorrect viscosity of engine oil
• Charge battery.
• Clean contact and connect ground firmly
• Change engine oil with proper viscosity
The start motor runs, but engine cannot
be started
• Air in fuel system
• Clogged fuel filter
• No fuel supply
• Defective engine
• Defective key stop unit
• Bleed the system
• Clean or replace the filter
• Open the cock and add fuel
• Have it repaired or replaced by workshop
• Have it repaired or replaced by workshop
Engine runs irregularly
• Air in fuel system
• Clogged fuel filter
• Clogged injection nozzle
• Fuel leak from pipe
• Poor fuel injection
• Bleed the system
• Clean or replace the filter
• Have it repaired or replaced by workshop
• Tighten clamp, replace pipe or machine
surface of copper washer before installation
• Have it repaired or replaced by workshop
Engine stops at low speed
• Defective injection pump
• Incorrect engine valve clearance
• Low idle speed
• Faulty nozzle
• Have it repaired or replaced by workshop
• Have it repaired or replaced by workshop
• Adjust speed to the rated speed
• Have it repaired or replaced by workshop
1. ENGINE TROUBLESHOOTING
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