John Deere 330G Skid Steer Troubleshooting

The John Deere 330G skid steer 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 91.2 hp (68 kW) at 2500 rpm. The John Deere 330G is equipped with a two-speed transmission, hydraulic wet disc brakes, and 14x17.5 standard tires. The hydraulic system has a pump with fluid flow rate of 23.5 gpm (89 lpm). The hydraulic pressure is 3450 psi (238 bar). The skid steer loader has a rated operating capacity of 3000 lbs (1362 kg) and tipping load of 6000 lbs (2724 kg). The boom lifting force is 7000 lbs (3175 kg), and bucket breakout force is 9350 lbs (4241 kg).

Engine Troubleshooting

Engine difficult to start or will not start

Air in fuel tank - Bleed fuel tank.
Fuel filter element is clogged - Clean or change the filter.
Fuel injection nozzles are damaged or dirty - Replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Excessive valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump is damaged - Replace or repair injection pump.

Diesel starts and stops

Dirty air filter - Clean or change filter.
Clogged fuel filter - Change the filter element.
Fuel injection pump has loose connections - Tighten the connections.
Damaged or clogged injectors - Inspect fuel injectors and change as required.
Fuel injection pump is faulty - Install a new pump or rebuild.

Engine stalls during operation

Engine has not warmed up to required temperature - Normalize the engine temperature.
Dirty fuel filter - Replace the filter element.
Air in the fuel system - Air bleeding.
Dirty or faulty injection nozzles - If necessary, replace with a new nozzle.
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.

Engine stalls while idling

Low idle speed set incorrectly - Normalize low idle speed.
Fuel injection pump is defective - Rebuild or replace pump.
Defective fuel injectors - Clean fuel injectors or change it.
The valve clearance is not adjusted - Need to adjust valve clearance.

Engine loses power

Clogged air cleaner - Clean or change.
Clogged injection nozzle - Test injection nozzles and change if necessary.
Fuel injection pressure is wrong - Adjust pressure to proper level.
Valve clearance is not correct - Adjust valve clearance according to specifications.
Incorrect low idle speed adjustment - Adjust the low idle speed.
Fuel hoses or lines are clogged - Clean fuel lines and hoses.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Piston rings are worn or damaged - Replace piston rings.

Engine overheated

Low coolant level - Fill radiator to proper level and check components for faults.
Low engine oil level - Add oil to the engine crankcase.
Damaged radiator cap or dirty radiator core - Change cap or clean radiator.
Damaged or worn fan belt - Install new fan belt.
Diesel engine is overloaded - Reduce engine load.

Low oil pressure

Lack of oil - Checking oil level and add if necessary.
Oil filter clogging - Replace or service engine oil filter.
Incorrect engine oil Use the specified type of engine oil.
Main bearing oil clearance is excessive - Change bearings.
Oil pump is damaged - Inspect and change as required.

Engine knocking or noise

Not enough engine oil - Need to add engine oil.
Engine not warmed up - Warm up the engine.
Wrong setting of fuel injection pump timing - Set it up as required.
Incorrect low idle setting - Adjust as required.
Damaged or clogged injectors - Clean or replace fuel injectors.
Connecting rod is worn or misaligned - Need to change or align the connecting rod.
Pistons are worn or scored - Replace the pistons as required.

Drive System Troubleshooting

Machine does not move forward or backward

Insufficient hydraulic fluid - Check and refill the hydraulic fluid.
Damaged drive chain - Inspect drive chain and replace defective components.
Defective input drive shaft - Rebuild or change.
Faulty relief valve - Change or repair defective relief valve.
Clogged suction line or hydraulic filter - Clean suction line or change hydraulic filter.
Foot or hand controls are faulty - Repair or change.
Drive pump or motor malfunction - Repair or change faulty component.

Loss of power

Clogged hydraulic oil filter - Check, clean, or replace as required.
Relief valve is worn or opened - Close or change relief valve.
Transmission components are worn or defective - Check and replace faulty components.
Input drive shaft is worn - Replace drive shaft.
Hydraulic system is leaking air - Bleed air from system.

Drive system overheating

Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Hydraulic fluid filter is plugged - Change or service hydraulic filter.
Relief valve failure - Repair or replace.
Hydraulic motor or drive pump is worn - Replace or repair faulty component.
Oil cooler is clogged - Cooling fins need to be cleaned.
Drive system overload - Reduce loading.

Drive system is excessively noisy

Oil viscosity is wrong - Use correct oil viscosity.
Air leaks in hydraulic system - Bleed air from system.
Hydraulic motor or drive pump is worn - Check and repair if required.
Worn or defective mechanical parts of drive system - Inspect the parts and repair as required.

Hydraulics Troubleshooting

Hydraulic system has overheating

Hydraulic pressure is incorrect - Adjust it correctly.
Misadjusted or defective main relief valve - Adjust or change relief valve.
Contaminated hydraulic fluid - Change hydraulic fluid.
Hydraulic fluid level is low - Need to add fluid.
Hydraulic pump is faulty - Install new pump or repair it.

Lift arm can't drop or lift

Lift controls malfunction - Inspect and repair if necessary.
Hydraulic pump is broken - Replace or repair pump if necessary.
Hydraulic control valve failure - Repair or change hydraulic valve.
Hydraulic cylinder malfunction - Repair or change hydraulic cylinder.
Low hydraulic fluid level - Add fluid as required.

Bucket fails to tilt

Bucket tilt controls are defective - Inspect and repair if necessary.
Hydraulic pump malfunction - Change or repair hydraulic pump if required.
Faulty hydraulic control valve - Repair or change hydraulic valve.
Bucket cylinder malfunction - Change or repair cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Boom or bucket is working slowly

Hydraulic pump is worn - Check pump flow and install new pump if necessary.
Leaking hydraulic cylinder - Replace cylinder piston seals.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.
Hydraulic control valve is not set properly or defective - Repair or set correctly.
Hydraulic pressure loss - Hydraulic pressure must be set correctly.

Lift arm or bucket is moving jerkily

Air in the hydraulic system - Bleed hydraulic system.
Hydraulic oil filter element is clogged - Clean or change the filter.
Hydraulic fluid contamination - The fluid must be changed.
Cylinder rod or tube is scuffed - Replace worn component.

Hydraulic pump makes excessive noise

Low oil level or hydraulic leaks - Correct hydraulic leaks or top up oil as needed.
Clogged hydraulic filter - Clean or install new filter.
Plugged suction line - Need to clean the suction line.
Pump is sucking air - Bleed air from hydraulics.
Pump components are faulty - Rebuild or change hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged

Corroded or loose cable connections - Clean or tighten connections.
Faulty electrical terminal connectors - Terminal connectors need to be changed.
Dead cell in battery - Battery change required.
Belt is defective or loose - Change belt or adjust belt tension.

Starter turning slow

Low battery output - Charge the battery.
Battery does not hold charge - Battery needs to be serviced or replaced.
Bad battery terminals or disconnected wiring - Connect cables correctly or replace terminals.

Starter does not work

Battery is low or faulty - Charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery voltage - Charge the battery.
Starter motor is faulty - Change or repair starter.