Kubota L4701, Operator'S Manual

Page: 135 / 142

TROUBLESHOOTING
ENGINE TROUBLESHOOTING
If something is wrong with the engine, refer to the following table for the cause of the trouble and its corrective
measure.
Trouble Cause Countermeasure
Engine is difficult to start or will not start.
• No fuel flow.
• Check the fuel tank and the fuel filter.
Replace the filter if necessary.
• Air or water is in the fuel system.
• Check to see if the bolt and nut of fuel-line-coupler are tight.
• Bleed the fuel system.
(See Bleeding the fuel system on page 125)
• In winter, oil viscosity increases,
and engine revolution is slow.
• Use oils of different viscosity, depending on ambient tem-
peratures.
• Use the engine-block-heater (optional).
• Battery becomes weak and the
engine does not turn over quick
enough.
• Clean the battery cables and terminals.
• Charge the battery.
• In cold weather, always remove the battery from the engine,
charge the battery, and store it indoors.
Install the battery on the tractor only when the tractor is go-
ing to be used.
• Preheat (glow plug) system trou-
ble.
• Check to see if the slow-blow-fuse of the preheat (glow
plug) blows.
• Check to see if the preheat (glow plug) functions in cold
weather.
Insufficient engine power
• Insufficient or dirty fuel • Check the fuel system.
• The air cleaner is clogged. • Clean or replace the air-cleaner-element.
Engine stops suddenly. • Insufficient fuel
• Refuel.
• Bleed the fuel system if necessary.
Exhaust fumes are colored.
Black
• Fuel quality is poor. • Change the fuel and the fuel filter.
• Too much oil • Check the proper amount of oil.
• The air cleaner is clogged. • Clean or replace the air-cleaner-element.
Blue white
• The inside of exhaust muffler is
damped from fuel.
• Check to see if the preheat (glow plug) functions in cold
weather.
• Heat the muffler by applying load to the engine.
• Trouble of injection nozzle • Check the injection nozzle.
• Fuel quality is poor. • Change the fuel and fuel filter.
Engine overheats.
• Engine overloaded. • Shift to lower the gear or reduce the load.
• Low coolant level
• Fill the cooling system to the correct level.
Check the radiator and the hoses for loose connections or
leaks.
• Loose or damaged fan belt • Adjust or replace the fan belt.
• Dirty radiator core or grille
screens
• Remove all trash.
• Coolant flow route corroded. • Flush the cooling system.
If there are any questions about the engine, consult your local KUBOTA Dealer.
ENGINE TROUBLESHOOTING TROUBLESHOOTING
L4701
131