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Kubota D750 Troubleshooting

Engine Model: Kubota D750
Engine Type: 4-cycle 3-cylinder liquid-cooled diesel engine
Total Displacement: 46.5 (0.76 L)
Rated Engine Power: 16.5 Hp (12.7 kW) at 3200 rpm
Aspiration Type: Naturally aspirated


Engine starts hard or doesn't start

Dirty fuel filter - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Clogged injection nozzle - Check injection nozzles and replace if required.
Fuel injection pump damage - Repair or install new pump.

Diesel starts but immediately stops

Clogged fuel filter - Service the filter.
Faulty fuel injection pump - Rebuild or replace pump.
Restricted intake air - Change air filter element.

Diesel shuts off while driving

Improper fuel injection timing - Adjust as recommended.
Dirty fuel filter - Replace filter element.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.

Engine stalls at low idle speed

Low idle speed set incorrectly - Need to adjust idle speed.
Valve out of adjustment - Need to adjust valve clearance.
Fuel injection pump malfunction - Install a new pump or rebuild.

Engine power is too low

Clogged injection nozzle - Clean or replace injection nozzles.
Clogged fuel hoses or lines - Clean fuel system lines and hoses.
Plugged air cleaner - Change air filter element.
Worn cylinder head gasket - Gasket should be replaced.

Engine overheating

Dirty radiator fins or faulty radiator cap - Clean radiator or replace cap.
Low engine coolant - Add coolant and check the components of cooling system.
Damaged or worn fan belt - Install new fan belt.
Insufficient engine oil - Need to add engine oil.

Low oil pressure

Not enough oil in the engine - Fill the crankcase with oil.
Oil pump failure - Replace as required.
Oil filter clogged - Change or clean engine oil filter element.

High engine oil consumption

Oil leakage: Gaskets or seals are excessively worn - Replace to repair leaks.
Incorrect oil viscosity - Use oil of correct viscosity.
Piston rings are seized or worn - Replace piston rings.
Valve stems and guides are worn - Valves replacement required.
Cylinder liners or pistons are scuffed - Inspect pistons and liners, fit new components as necessary.

Engine noise or knocking

Engine not warmed up - Engine is not warmed up to the required temperature.
Engine oil level is low - Need to add engine oil.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Piston wear or scoring - Have pistons replaced.
Connecting rod is not aligned or defective - Need to change or align the connecting rod.

Starter cranks slowly

Low battery voltage - Battery is drained, recharge it.
Battery discharges quickly - Service charging system or replace battery.
Bad battery terminals or disconnected wiring - Connect cables properly or replace terminals.

Starter does not work

Battery is discharged or worn - Charge or replace the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery capacity is low - Battery needs to be recharged.
Faulty starter motor - Starter needs to be replaced.