John Deere 4045HF120 Troubleshooting
| Engine Model: John Deere PowerTech 4045HF120 |
| Engine Type: 4-stroke in-line 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 275 cu.in (4.5 L) |
| Rated Engine Power: 115 Hp (86 kW) at 2400 rpm |
| Fuel System Type: Direct Injection |
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| Engine starts hard or doesn't start |
Fuel filter plugged - Replace filter element.
Air in the fuel system - Air bleeding.
Defective injection nozzle - Change fuel injection nozzles.
Fuel injection pump damage - Install a new pump or rebuild.
Incorrect valve timing - Adjust or change timing gear.
Clogged fuel pipes - Service fuel pipes.
Injection timing is improper - Set up as recommended.
Worn piston rings and cylinder - Change faulty parts.
| Diesel starts but immediately stops |
Fuel filter plugging - Replace the filter element.
Fuel injection pump is broken - Repair or install new pump.
Restricted intake air - Replace air filter element.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine stops suddenly during operation |
Wrong setting of fuel injection pump timing - Set it up as required.
Dirty fuel filter - Replace the filter element.
Engine has not warmed up to the recommended temperature - Warm up to required temperature.
Injection nozzles are stuck or clogged - Change or repair injection nozzles.
Low idle speed setting is not correct - Correct the settings.
Incorrect valve clearance - Check and adjust as required.
Faulty fuel injection pump - Replace or repair injection pump.
Clogged injection nozzle - Check and replace nozzles if required.
Dirty fuel lines or hoses - Clean fuel hoses and lines.
Plugged air cleaner - Change air filter element.
Cylinder head gasket is defective - Replace the gasket as required.
Wrong injection timing - Check injection timing adjustment.
Faulty fuel injection pump - Repair or install new pump.
Any of moving engine components is faulty - Change or repair damaged parts.
Radiator fins are dirty or radiator cap is defective - Replace cap or clean radiator.
Insufficient coolant - Fill the cooling system and check components for leaks or other faults.
Loose or defective fan belt - Change the fan belt.
Engine oil insufficient - Fill up the oil to required level.
Blown cylinder head gasket - Gasket should be replaced.
Injection timing is out of adjustment - Adjust as recommended.
| Insufficient oil pressure |
Oil level is insufficient - Check and refill the oil.
Oil pump malfunction - Check and replace if necessary.
Oil filter is clogged - Change or service engine oil filter.
Stuck or defective relief valve - Replace or service relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Test and replace or repair worn components.
| Engine consuming too much oil |
External oil leaks: Worn gaskets or seals - Change to repair leaks.
Improper oil viscosity - Use proper viscosity oil.
Worn or broken piston rings - Replace piston rings.
Valve stems or guides are damaged - Change the valves.
Worn pistons or cylinder liners - Check liners and pistons, replace as required.
Engine is not preheated - Warm up the engine.
Insufficient engine oil - Fill the crankcase with engine oil.
Timing of fuel injection pump is incorrect - Adjust the pump as required.
Piston wear or scoring - Replace the pistons as required.
Connecting rod is worn or not aligned - Align or change connecting rod.
Battery voltage is low - Battery is drained, recharge it.
Battery is draining quickly - Battery needs service or replacement.
Disconnected wires or corroded battery terminals - Connect wires correctly or change terminals.
Battery is drained or worn - Need to charge or replace the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery capacity - Battery needs to be recharged.
Starter motor is faulty - Starter should be changed.
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