Kubota Z750 Troubleshooting
| Engine Model: Kubota Z750A |
| Engine Type: 4-cycle 2-cylinder liquid-cooled diesel |
| Total Displacement: 45.3 cu.in (0.74 L) |
| Rated Engine Power: 17 Hp (8.8 kW) at 2800 rpm |
| Aspiration Type: Naturally aspirated |
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| Diesel hard to start or doesn't start |
Clogged fuel filter - Replace the filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are clogged or faulty - If necessary, replace with a new nozzle.
Fuel injection pump is broken - Rebuild or change fuel pump.
Wrong valve timing - Adjust or replace timing gear.
Clogged fuel pipes - Service or change fuel pipes.
Injection timing is wrong - Adjust injection timing as required.
Cylinder or piston rings are worn - Replace faulty parts.
| Engine starts and then shuts off |
Fuel filter plugging - Clean the filter element.
Fuel injection pump is not working correctly - Install a new pump or rebuild.
Air filter element clogged - Clean or change.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stops unexpectedly during operation |
Fuel injection timing is wrong - Set up as recommended.
Clogged fuel filter - Change filter element.
Engine is not warmed up to the required temperature - Warm up engine as required.
Stuck or burnt injection nozzle - Check injection nozzles and replace if required.
| Engine shuts off while idling |
Low idle speed set incorrectly - Test and adjust.
Valve out of adjustment - Check and adjust.
Fuel injection pump is broken - Repair or install new pump.
Fuel injection nozzles are damaged or dirty - If necessary, replace with a new nozzle.
Dirt in the fuel lines or hoses - Fuel lines and hoses need to be cleaned.
Plugged air cleaner - Air filter maintenance required.
Cylinder head gasket is defective - Replace the gasket as required.
Wrong injection timing - Set up as recommended.
Faulty fuel injection pump - Install a new fuel pump or repair.
One of moving engine parts has broken - Replace or repair damaged components.
Radiator core is dirty or radiator cap is damaged - Replace cap or clean radiator.
Low coolant level - Fill the cooling system and check components for leaks or other faults.
Loose or damaged fan belt - Change the fan belt.
Insufficient engine oil - Check and refill engine oil.
Cylinder head gasket is blown - Change cylinder head gasket.
Injection timing is out of adjustment - Adjust as recommended.
| Oil pressure is insufficient |
Engine oil level low - Check oil level and add oil as required.
Oil pump failure - Install a new pump.
Clogged oil filter - Replace or service engine oil filter.
Relief valve is stuck or broken - Change or clean relief valve.
Excessive oil clearance of crankshaft bearing - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Check and replace or repair defective parts.
| Engine consuming too much oil |
Oil leaking: Worn gaskets or seals - New components need to be installed.
Incorrect oil viscosity - Use correct viscosity oil.
Damaged or seized piston rings - Install new piston rings.
Worn valve stems and valve guides - Valves replacement required.
Scored cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Engine oil level is low - Add oil to the engine crankcase.
Incorrect adjustment of fuel injection pump timing - Adjust according to specifications.
Piston wear or scoring - Replace the pistons.
Connecting rod is not aligned or defective - Need to align or replace the connecting rod.
Low battery capacity - Battery needs to be recharged.
Battery discharges quickly - Service battery or change it.
Disconnected battery cables or bad terminals - Connect wiring properly or install new terminals.
Battery is discharged or worn - Charge or replace the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery power - Charge the battery.
Starter motor is damaged - Starter needs to be replaced.
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