John Deere 6068HF475 Troubleshooting
| Engine Model: John Deere PowerTech 6068HF475 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 173-250 Hp (129-187 kW) at 2400 rpm |
| Fuel System Type: Common Rail Direct Injection |
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| Engine starts up hard or will not start |
Clogged fuel filter - Change filter element.
Air in fuel system - Bleed fuel system.
Dirty or damaged injection nozzles - If necessary, replace with a new nozzle.
Faulty fuel injection pump - Replace injection pump or repair it.
Valve timing is incorrect - Correct or replace timing gear.
Fuel pipes are clogged - Clean or change fuel pipes.
Unadjusted injection timing - Set the injection timing correctly.
Worn cylinder or piston rings - Replace defective components.
Clogged fuel filter - Install new filter element.
Fuel injection pump failure - Install a new pump or rebuild.
Plugged air cleaner - Replace air filter element.
Nozzle opening pressure is incorrect - Set it correctly.
| Engine stops suddenly during operation |
Fuel injection timing is not adjusted - Set the fuel pump timing correctly.
Fuel filter element is clogged - Service or replace the filter.
Engine is not fully warmed up - Warm up the engine.
Injection nozzles are stuck or clogged - Repair or replace injection nozzles.
Improperly adjusted low idle speed - Adjust as required.
Excessive valve clearance - Correct valve clearance.
Fuel injection pump is not operating properly - Replace or rebuild injection pump.
Clogged or burnt injection nozzle - Clean or change injection nozzles.
Dirt in the fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Plugged air cleaner - Clean or change.
Cylinder-head gasket is leaking - Replace cylinder head gasket.
Unadjusted injection timing - Adjust as recommended.
Fuel injection pump failure - Rebuild or replace pump.
Any of moving engine components is faulty - Change or repair damaged parts.
Dirty radiator fins or faulty radiator cap - Clean radiator or change cap.
Lack of engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt slipping or worn - Replace as required.
Low engine oil level - Add oil to the engine crankcase.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Incorrect injection timing - Use correct injection timing adjustment.
Oil level is low - Fill the crankcase with oil.
Worn oil pump - Repair or change.
Oil filter element clogged - Service or change engine oil filter element.
Worn or dirty relief valve - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Check and replace or repair defective parts.
Excessive oil clearance of crankpin bearing - Check and replace or repair defective parts.
| Diesel engine consuming too much oil |
Oil leakage: Seals or gaskets are wearing excessively - To repair leaks, replace worn parts.
Incorrect oil viscosity - Use correct viscosity oil.
Piston rings are stuck or broken - Change the piston rings as required.
Valve guides or stems are damaged - Need to replace the valves.
Cylinder liners or pistons are scored - Check pistons and liners, change as required.
Engine is not fully warmed up - Warm up to required temperature.
Engine oil level low - Fill up the engine oil.
Fuel injection pump timing is wrong - Set up as recommended.
Pistons are scored or worn - Replace the pistons as required.
Faulty or misaligned connecting rod - Align or replace connecting rod.
Battery power is low - Low battery charging, charge as required.
Battery drains quickly - Service charging system or replace battery.
Faulty battery terminals or disconnected cables - Connect wiring correctly or install new terminals.
Battery is drained or defective - Recharge or change battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Charge the battery.
Defective starter motor - Starter should be changed.
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