LS U5020 - Troubleshooting

5-11. Troubleshooting
Warning
▶ To avoid injury due to sudden start, apply parking brake and place the
transmission gear in “Neutral” before checking and repairing.
Classific
ation
Problems Main causes Solutions
The start motor does
not turn when turning
the key switch.
▲ Start safety switch is not
contacted.
▲ PTO switch is not on “OFF”
position.
▲ Discharge of battery
▲
Terminal loosened
▲ Depress the clutch pedal
fully
▲ Place PTO switch on “OFF”
position
▲ Charge or replace
▲
Tighten
Engine
the key switch.
▲
Terminal loosened
▲ Key switch failure
▲ Start motor failure
▲
Tighten
▲ Repair or replace
▲ Repair or replace
The start motor turns
but the engine does
not start.
▲ The battery is weak.
▲ Bad ground
▲ Improper viscosity of engine
oil
▲ Air in fuel system
▲ Fuel filter clogged
▲ Error in engine body
▲ Fuel cock closed
▲ Charge or replace
▲ Tighten the ground
▲ Replace the oil with proper
viscosity.
▲ Bleed the air
▲ Wash or replace the filter
▲ Repair
▲ Open the cock
Engine revolution is
irregular.
▲ Air in fuel system
▲ Fuel filter clogged
▲ Injection nozzle clogged
▲ Fuel leakage
▲ Bleed air
▲ Clean or replace the filter
▲ Repair or replace
▲ Repair
5
5 5
5 - 29
▲ Irregular fuel injection ▲ Repair
Engine turns more
than maximum speed.
▲ Impurities in governor ▲ Repair
Engine stops suddenly
during operation.
▲ Fuel shortage
▲ Fault of nozzle
▲ moving parts failure due to bad
lubrication
▲ Add fuel and bleed air.
▲ Repair or replace
▲ Repair