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Home / Wheel Loaders / John Deere Wheel Loaders / John Deere 344G

John Deere 344G Troubleshooting

The John Deere 344G wheel loader driveline system components: John Deere 4045T 4-cylinder turbocharged liquid-cooled diesel engine with a rated power of 85 hp (63 kW), and 2-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 29.3 gal/min (111 l/min). The system relief pressure is 3130 psi (216 bar). The John Deere 344G is equipped with a power steering system, hydraulic wet disc brakes, and 15.5x25 tires. The wheel loader has a maximum lift height of 133.8" (3400 mm) and breakout force of 14225 lbs (6465 kg). The rated operating capacity is 5570 lbs (2530 kg), and tipping load is 11140 lbs (5060 kg).

Engine Troubleshooting

Engine hard to start or won't start
Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugged - Replace filter element.
Dirty or faulty injection nozzles - Test injection nozzles and change if necessary.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Excessive valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump malfunctioning - Replace injection pump or repair it.

Engine starts but then stops
Clogged air filter - Service or replace the air filter.
Fuel filter element clogging - Install new filter element.
Fuel injection pump has loose connections - Tighten the connections.
Fuel injectors are dirty or defective - Change or clean fuel injectors.
Fuel injection pump is damaged - Repair or change injection pump.

Engine stops unexpectedly during operation
Engine is cold - Warm up engine as required.
Dirty fuel filter - Service or replace the filter.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are damaged - Change fuel injection nozzles.
Fuel injection pump timing is wrong - Adjust according to specifications.

Engine stops while idle
Low idle speed setting is not correct - Adjustment required.
Defective fuel injection pump - Replace injection pump or repair it.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.

Engine power is too low
Clogged air cleaner - Clean or replace element.
Faulty or dirty injection nozzles - Test injection nozzles and change if necessary.
Insufficient fuel injection pressure - Adjust to correct pressure.
Valve clearance is wrong - Check and adjust.
Incorrect low idle speed adjustment - Adjust the low idle speed.
Clogged fuel lines or hoses - Fuel lines and hoses need to be cleaned.
Cylinder head gasket is worn - Change cylinder head gasket.
Defective or worn piston rings - Replace piston rings.

Engine is overheated
Not enough coolant - The cooling system needs to be refilled and checked for faults.
Lack of engine oil - Checking oil level and add if necessary.
Clogged radiator fins or damaged radiator cap - Clean radiator or change cap.
Loose or damaged fan belt - Replace the fan belt.
Diesel engine overloaded - Reduce load on the engine.

Oil pressure too low
Insufficient engine oil - Fill up the engine oil.
Engine oil filter is plugged - Change or clean engine oil filter element.
Incorrect engine oil Fill up with the proper oil viscosity.
Excessive crankshaft bearing oil clearance - Change bearings.
Oil pump is defective - Inspect and change as required.

Engine noise or knocking
Lack of engine oil - Fill up the oil to required level.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Improperly adjusted low idle speed - Correct low idle adjustment.
Clogged or defective injectors - Change or clean fuel injectors.
Connecting rod is defective or misaligned - Connecting rod needs to be replaced or aligned.
Pistons are worn or scored - Install new pistons.

Hydrostatic Transmission Troubleshooting

HST transmission makes excessive noise
Low transmission oil level or contaminated oil - Change transmission oil or top up to proper level.
Speed control linkage is defective or unadjusted - Replace or adjust linkage.
Relief valve failure - Install a new valve.
Transmission overload - The load should be reduced.
Transmission parts are worm or defective - Check internal transmission parts for damage or wear and replace if required.

Loss of power
Insufficient transmission fluid - Add fluid to the transmission housing.
Defective relief valve - Replace the valve.
Worn or out of adjustment speed control linkage - Adjust or install new linkage.

Transmission fluid overheated
Transmission oil insufficient - Need to add transmission oil.
Transmission oil filter is dirty - Service or replace the transmission oil filter.
Clogged or damaged cooling components - Check all cooling components and repair or change if required.
Transmission overloaded - Load needs to be reduced.

Transmission oil leaking
Worn seals or gaskets - Gaskets or seal replacement required.
Internal transmission housing pressure is too high - Change defective parts.
Clogged transmission fluid return pipe - Clean or change return pipe.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure incorrectly adjusted - Adjust it correctly.
Unadjusted or defective main relief valve - Set up or change the relief valve.
Hydraulic oil contamination - Fill up with fresh hydraulic oil.
Lack of hydraulic oil - Add oil to the hydraulic system.
Defective hydraulic pump - Repair or change pump if required.

Boom fails to lift or drop
Defective lift controls - Repair or replace.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Hydraulic control valve is defective - Change or repair hydraulic valve.
Broken hydraulic cylinder - Repair or install a new lift cylinder.
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.

Bucket can't tilt
Bucket controls failure - Change or repair.
Hydraulic pump failure - Install new pump or repair it.
Damaged hydraulic control valve - Repair or change hydraulic valve.
Broken bucket cylinder - Repair or change cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.

Boom or bucket is moving slowly
Worn hydraulic oil pump - Test pump performance and replace pump if necessary.
Hydraulic cylinder oil leakage - Correct leakage by changing the seals.
Insufficient hydraulic fluid - Add fluid as required.
Hydraulic control valve is not set properly or defective - Repair or set properly.
Hydraulic pressure is low - Adjust pressure as required.

Jerky operation of the bucket or boom
Air leaks in hydraulic system - Bleed air from hydraulic system.
Clogged hydraulic oil filter element - Replace or clean the filter.
Dirty hydraulic fluid - Hydraulic fluid change required.
Cylinder tube or rod is scored - Change worn component.

Hydraulic pump makes excessive noise
Hydraulic leakage or lack of oil - Add hydraulic oil or correct system leaks.
Hydraulic filter is clogged - Replace or clean the filter.
Dirty suction line - Clean suction line as required.
Air trapped in hydraulic pump - Bleed air from hydraulics.
Damaged pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery will not charge
Loose or corroded cable connections - Service or tighten connections.
Faulty electrical terminal connectors - Replace terminal connectors.
Battery dead cell - Change the battery.
Loose or defective belt - Replace belt or adjust belt tension.

Starter cranks slow
Battery power is low - Battery needs to be recharged.
Battery will not hold charge - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Check battery wires and service or replace terminals.

Starter will not work
Battery is drained or defective - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Low battery charging, charge as required.
Faulty starter motor - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders