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John Deere 333G Troubleshooting

The John Deere 333G compact track loader is powered by 186.3 cu.in (3.1L) Yanmar 4TNV94FHT vertical inline four-cylinder turbocharged intercooled diesel engine with a rated power of 100 hp (74.6 kW) at 2500 rpm. The John Deere 333G is equipped with a two-speed transmission, hydraulic wet disc brakes, and rubber tracks with steel inserts. The hydraulic system has a pump with fluid flow rate of 25 gpm (95 lpm). The hydraulic pressure is 3450 psi (238 bar). The track loader has a rated operating capacity of 3700 lbs (1680 kg) and tipping load of 10570 lbs (4800 kg). The boom lifting force is 8520 lbs (3865 kg), and bucket breakout force is 13905 lbs (6307 kg).

Engine Troubleshooting

Engine starts hard or will not start
Air trapped in fuel system - Bleed air.
Dirty fuel filter - Replace filter element.
Fuel injection nozzles are damaged - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve out of adjustment - Adjust valve clearance.
Defective fuel injection pump - Replace or rebuild injection pump.

Engine starts but then stops
Clogged air cleaner - Clean or replace element.
Fuel filter plugging - Replace filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Dirty or defective injectors - Clean fuel injectors or change it.
Fuel injection pump is damaged - Repair or change injection pump.

Engine stops suddenly during operation
Engine is not preheated - Warm up to required temperature.
Clogged fuel filter - Install new filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are clogged or faulty - Check injection nozzles and replace if required.
Wrong setting of fuel injection pump timing - Adjust as recommended.

Engine stalling at idle
Improperly adjusted low idle speed - Adjust the low idle speed.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
Clogged or defective injectors - Clean fuel injectors or change it.
Valve clearance is out of adjustment - Check and adjust as required.

Loss of engine power
Air filter is plugged - Clean or change.
Clogged or burnt injection nozzle - Replace injection nozzles.
Uneven fuel injection pressure - Adjust to correct pressure.
Excessive valve clearance - Correct valve clearance needs to be set.
Incorrectly adjusted low idle speed - Test and adjust.
Fuel lines or hoses clogging - Fuel hoses and lines must be clean.
Cylinder-head gasket is broken - Install new cylinder head gasket.
Piston rings are broken or leaking - Piston rings need to be replaced.

Engine is overheated
Engine has a lack of coolant - Add coolant fluid and inspect the cooling system for leaks.
Engine oil level is insufficient - Fill up the oil to required level.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or change cap.
Fan belt is loose or defective - Replace the fan belt.
Engine overload - Reduce load on the engine.

Low oil pressure
Low crankcase oil level - Need to add oil.
Oil filter clogged - Clean or replace engine oil filter element.
Incorrect oil viscosity - Fill up with the correct oil viscosity.
Crankshaft bearing has incorrect oil clearance - Bearing replacement required.
Defective oil pump - Install a new pump.

Engine knocking or noise
Low engine oil level - Check and refill engine oil.
Engine is not warmed up to the required temperature - Warm up to required temperature.
Incorrect adjustment of fuel injection pump timing - Set the fuel pump timing correctly.
Wrong adjustment of low idle speed - Need to adjust idle speed.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Connecting rod is misaligned or worn - Align or replace connecting rod.
Pistons are broken or worn - Install new pistons.

Drive System Troubleshooting

Drive system won't work in one direction or either direction
Low hydraulic fluid level - Fill up the hydraulic fluid.
Track mechanism is defective or jammed - Remedy jamming or repair tracks.
Worn or defective relief valve - Rebuild or install a new relief valve.
Hydraulic filter or suction line is clogged - Service suction line or change hydraulic filter.
Defective foot or hand controls - Inspect and repair if necessary.
Worn drive motor or pump - Repair or change faulty component.

Machine won't drive straight or drives jerkily
Damaged or jammed track mechanism - Fix jamming or repair tracks.
Tracks are faulty or improperly tensioned - Replace tracks or adjust track tension.
Track frame is clogged with debris or dirt - Remove debris or clean track frame.

Loss of power
Hydraulic oil filter is clogged - Change or service hydraulic filter.
Relief valve is open or worn - Close or change relief valve.
Transmission parts are damaged or faulty - Inspect and change faulty parts.
Defective input drive shaft - Repair or replace faulty drive shaft.
Air in the hydraulic system - Air bleeding is required.

Drive system overheats
Hydraulic fluid level low - Fill up the hydraulic fluid.
Plugged hydraulic fluid filter - Replace hydraulic filter.
Relief valve worn or defective - Rebuild or install a new relief valve.
Worn hydraulic motor or drive pump - Repair or replace faulty component.
Plugged hydraulic oil cooler - Clean cooling fins as required.
Drive system overload - Load should be reduced.

Drive system is excessively noisy
Improper oil viscosity - Use correct oil viscosity.
Hydraulic system is leaking air - Bleed air from system.
Worn hydraulic motor or drive pump - Inspect and replace as necessary.
Defective or worn mechanical components of drive system - Check the components and change if necessary.

Hydraulics Troubleshooting

Hydraulic system overheats
Incorrect hydraulic pressure setting - Adjust pressure correctly.
Main relief valve failure or improper setting - Set up or change the relief valve.
Hydraulic fluid contamination - Hydraulic fluid change required.
Hydraulic fluid level is insufficient - Fill the hydraulic system with oil.
Defective hydraulic pump - Repair or install new hydraulic pump.

Boom fails to lift or drop
Lift controls are defective - Repair or replace.
Damaged hydraulic oil pump - Repair or install new hydraulic pump.
Defective hydraulic control valve - Repair or replace hydraulic valve.
Defective hydraulic cylinder - Repair or install a new lift cylinder.
Hydraulic fluid level low - Fill up the hydraulic fluid.

Bucket is not working
Bucket controls are faulty - Repair or change.
Hydraulic pump not working - Repair or replace pump if necessary.
Damaged hydraulic control valve - Change or repair hydraulic valve.
Damaged bucket cylinder - Change or repair cylinder.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.

Boom or bucket runs slowly
Defective hydraulic pump - Check the pump capacity and replace pump if required.
Hydraulic cylinder oil leakage - Cylinder seals need to be replaced.
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.
Hydraulic control valve is defective or set improper - Repair or set properly.
Low hydraulic pressure - Adjust pressure correctly.

Bucket or boom is jerky
Air trapped in hydraulic system - Need to bleed air.
Clogged hydraulic oil filter element - Service or replace the hydraulic filter.
Hydraulic oil contamination - Change hydraulic oil.
Cylinder rod or tube is scratched - Change worn component.

Excessive hydraulic pump noise
Leaking hydraulic system or insufficient oil level - Repair hydraulic leaks or add oil as required.
Hydraulic filter clogging - Service or change hydraulic filter.
Dirty suction line - Need to clean the suction line.
Pump sucks air - Need to bleed air.
Damaged pump components - Change or rebuild pump.

Electrical Troubleshooting

Battery is not charging
Electrical cable connections are corroded or loose - Clean or tighten wiring connections.
Electrical terminal connectors are faulty - Install new terminal connectors.
Bad cell in battery - Replace the battery.
Belt is damaged or loose - Replace belt or adjust belt tension.

Starter turning slow
Low battery output voltage - Charge the battery.
Battery discharges quickly - Service charging system or change battery.
Disconnected cables or faulty battery terminals - Connect cables properly or replace terminals.

Starter will not crank
Battery is discharged or defective - Recharge or change battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Battery voltage is low - Battery is drained, charge it.
Defective starter motor - Starter should be replaced.