John Deere 6125HF070 Troubleshooting
| Engine Model: John Deere PowerTech 6125HF070 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 763 cu.in (12.5 L) |
| Rated Engine Power: 350-525 Hp (261-392 kW) at 2100 rpm |
| Fuel System Type: Electronic Unit Injection |
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| Engine starts hard or will not start |
Clogged fuel filter - Change the filter element.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles fault - Change fuel injection nozzles.
Damaged fuel injection pump - Rebuild or change fuel pump.
Valve timing is wrong - Adjust or change timing gear.
Fuel pipes are clogged - Service or change fuel pipes.
Wrong injection timing - Adjust injection timing as required.
Excessive wear of piston rings and cylinder - Change defective components.
| Engine starts but stalls suddenly |
Fuel filter element is clogged - Replace filter element.
Damaged fuel injection pump - Replace injection pump or repair it.
Air filter plugged - Clean or change.
Improper nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly while running |
Fuel injection timing is not adjusted - Adjust as recommended.
Fuel filter element is dirty - Filter maintenance required.
Low coolant temperature - Warm up the engine.
Stuck or clogged injection nozzle - Repair or replace injection nozzles.
Low idle speed setting is incorrect - Correct the settings.
Valve out of adjustment - Check and adjust as required.
Fuel injection pump malfunction - Replace or repair injection pump.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Fuel lines or hoses are clogged - Clean fuel system hoses and lines.
Intake air restriction - Service or replace the air filter.
Cylinder head gasket is worn - Install new cylinder head gasket.
Injection timing is incorrect - Check injection timing adjustment.
Fuel injection pump malfunctioning - Replacement or repair required.
One of moving engine components is worn - Change or repair damaged parts.
Damaged radiator cap or dirty radiator core - Clean radiator or install new cap.
Engine coolant is insufficient - Refill to the correct level and inspect system for leaks.
Fan belt is worn or faulty - Install new fan belt.
Insufficient engine oil - Check and refill engine oil.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Injection timing is incorrect - Adjust as recommended.
Not enough oil in the engine - Check and refill the oil.
Oil pump is damaged - Repair or replace.
Oil filter element clogged - Replace or service engine oil filter.
Relief valve is stuck or worn - Replace or clean relief valve.
Excessive oil clearance of crankshaft bearing - Check and change or repair defective parts.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
| Diesel engine consuming too much oil |
External oil leaks: Worn seals or gaskets - Change worn parts according to specifications.
Incorrect oil viscosity - Use correct viscosity oil.
Damaged or seized piston rings - Install new piston rings.
Valve stems or guides are damaged - Valves need to be changed.
Pistons or cylinder liners are damaged - Check pistons and liners, replace as required.
| Abnormal engine knocking or noise |
Engine is not fully warmed up - Warm up the engine.
Insufficient engine oil - Fill up the engine oil.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Worn or scored pistons - Have pistons replaced.
Connecting rod is misaligned or worn - Replace or align connecting rod.
Battery power is low - Battery needs to be recharged.
Battery does not hold charge - Service charging system or replace battery.
Disconnected battery cables or bad terminals - Connect wiring properly or install new terminals.
Battery is discharged or worn - Change or recharge battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Low battery charging, charge as required.
Starter motor failure - Replace or repair starter.
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