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John Deere 314G Troubleshooting

The John Deere 314G skid steer loader driveline system components: Yanmar 4TNV86CT four-cylinder direct injection turbocharged diesel engine with a rated power of 48 hp (35.8 kW), and single-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 17 gal/min (64.4 l/min). The system relief pressure is 3250 psi (224 bar). The John Deere 314G is equipped with a vertical-lift loader boom, 80HD drive chains, and 10x16.5 tires. The skid steer loader has a maximum lift height of 120" (3050 mm) to hinge pin and dump height of 94.3" (2400 mm). The rated operating capacity is 1760 lbs (800 kg), and tipping load is 3520 lbs (1600 kg).

Engine Troubleshooting

Engine difficult to start or won't start
Air in fuel tank - Bleed fuel tank.
Fuel filter element is dirty - Change filter element.
Faulty or dirty injection nozzles - If necessary, replace with a new nozzle.
Water or dirt in fuel system - Drain, flush, and service the system.
Improper valve clearance - Adjust to proper valve clearance.
Damaged fuel injection pump - Install a new fuel pump or repair.

Engine starts and immediately shuts off
Air filter is dirty - Change or service air filter element.
Fuel filter plugging - Clean or change the filter.
Fuel injection pump has loose connections - Tighten the connections.
Dirty or defective injectors - Change or clean fuel injectors.
Fuel injection pump damage - Install a new fuel pump or repair.

Engine stops suddenly during operation
Engine is not preheated - Engine is not warmed up to the required temperature.
Fuel filter element is clogged - Change the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Damaged or dirty injection nozzles - Service or change injection nozzles.
Improper fuel injection timing - Adjust according to specifications.

Engine stalls while idle
Low idle speed setting is not correct - Correct low idle settings.
Fuel injection pump is not working correctly - Install a new pump or rebuild.
Fuel injectors are dirty or defective - Test and replace fuel injectors if necessary.
Improper valve clearance - Correct valve clearance.

Diesel engine loses power
Clogged air cleaner - Clean or replace element.
Defective injection nozzle - Test injection nozzles and change if necessary.
Incorrect fuel injection pressure - Adjust pressure to proper level.
Excessive valve clearance - Correct valve clearance.
Low idle speed setting is incorrect - Correct low idle settings.
Dirt in the fuel hoses or lines - Clean fuel system lines and hoses.
Leaking cylinder head gasket - Replace the gasket as required.
Damaged or leaking piston rings - Replace the piston rings as required.

Engine is overheated
Not enough coolant - Fill radiator to proper level and check components for faults.
Engine oil level is insufficient - Fill up the oil to required level.
Clogged radiator fins or damaged radiator cap - Clean radiator or replace cap.
Fan belt is broken or worn - If necessary, replace the belt.
Diesel engine is overloaded - Reduce load on the engine.

Oil pressure too low
Lack of oil - Fill the crankcase with oil.
Clogged oil filter - Change or service engine oil filter.
Oil grade or viscosity is wrong - Drain crankcase and refill with correct oil.
Crankshaft bearing oil clearance is incorrect - Bearing replacement required.
Oil pump failure - Repair or replace.

Engine knocks or noises
Insufficient engine oil - Need to add engine oil.
Engine is not preheated - Engine is not warmed up to the required temperature.
Improper fuel injection timing - Adjust according to specifications.
Incorrectly adjusted low idle speed - Adjust low idling as recommended.
Defective fuel injectors - Change or clean fuel injectors.
Connecting rod is not aligned or defective - Need to change or align the connecting rod.
Worn or broken pistons - Pistons replacement required.

Drive System Troubleshooting

Drive system doesn't work in either direction
Hydraulic fluid is insufficient - Check and refill the hydraulic fluid.
Drive chain is worn - Inspect drive chain and replace defective parts.
Relief valve is worn or damaged - Service or change relief valve.
Dirty suction line or hydraulic filter - Clean suction line or replace hydraulic filter.
Foot or hand controls are defective - Repair or change.
Drive motor or pump failure - Inspect and change as required.

Low power
Hydraulic oil filter is clogged - Check, clean, or replace as required.
Relief valve is damaged or open - Replace or close relief valve.
Faulty or damaged transmission components - Inspect and change faulty parts.
Defective input drive shaft - Faulty drive shaft need to be replaced or repair.
Air in the hydraulic system - Air bleeding is required.

Drive system keeps overheating
Hydraulic oil level is low - Checking hydraulic oil level and add if necessary.
Hydraulic fluid filter is plugged - Check, clean, or change as necessary.
Defective or worn relief valve - Repair or change.
Hydraulic motor or drive pump is worn - Check and repair if required.
Oil cooler is clogged - Cooling fins need to be cleaned.
Overloaded drive system - Reduce loading.

Drive system is noisy
Oil viscosity is incorrect - Drain and refill with proper oil.
Air in hydraulic system - Bleed air from system.
Worn hydraulic motor or drive pump - Replace or repair faulty component.
Worn or damaged mechanical parts of drive system - Check drive system and change faulty components.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is incorrect - Set pressure correctly.
Main relief valve failure or improper setting - Adjust the valve or replace if necessary.
Contaminated hydraulic oil - Change hydraulic oil.
Hydraulic oil level is low - Fill up the hydraulic oil.
Worn hydraulic oil pump - Install new pump or repair it.

Boom fails to lift or drop
Faulty lift controls - Repair or change.
Damaged hydraulic oil pump - Change or repair hydraulic pump if required.
Hydraulic control valve is faulty - Repair or change the valve.
Hydraulic cylinder is faulty - Install a new boom cylinder or repair it.
Insufficient hydraulic oil - Need to add oil.

Bucket can't tilt
Defective bucket controls - Inspect and repair if necessary.
Damaged hydraulic oil pump - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Bucket cylinder failure - Install a new cylinder or repair it.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Boom or bucket is working slowly
Worn hydraulic oil pump - Check pump capacity and change if necessary.
Hydraulic cylinder oil leakage - Correct leakage by changing the seals.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Hydraulic control valve is defective or set improper - Adjust correctly or repair.
Hydraulic pressure loss - Adjust pressure as required.

Lift arm or bucket is moving jerkily
Air in hydraulic system - Bleed hydraulic system.
Hydraulic oil filter element clogging - Replace or clean the filter.
Hydraulic oil contamination - Fill up with fresh hydraulic oil.
Cylinder rod or tube is scuffed - Replace worn component.

Hydraulic pump is excessively noisy
Lack of oil or hydraulic leakage - Add hydraulic oil or correct system leaks.
Hydraulic filter is dirty - Clean or replace the filter.
Dirty suction line - Clean suction line as required.
Pump sucks air - Remove air from hydraulics.
Worn pump components - Replace or rebuild the pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are loose or corroded - Clean or tighten wiring connections.
Defective battery terminal clamps - Install new terminal clamps.
Worn-out battery - Replace the battery.
Belt is worn or loose - Adjust belt tension or install a new belt.

Starter turns slow
Battery power is low - Battery is drained, charge it.
Battery runs out quickly - Battery needs service or replacement.
Faulty battery terminals or disconnected cables - Connect wires correctly or change terminals.

Starter is not cranking
Battery is discharged or defective - Charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output voltage - Battery needs to be recharged.
Damaged starter motor - Repair or install a new starter.