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John Deere 320G Troubleshooting
The
John Deere 320G skid steer loader is powered by 202.5 cu.in (3.3L) Yanmar
4TNV98C four-cylinder direct injection liquid-cooled diesel engine with a rated
power of 66 hp (49.5 kW) at 2500 rpm. The John Deere 320G is equipped with a
two-speed hydrostatic transmission, vertical-lift loader boom, 80HD drive
chains, and 12.00x16.5 standard tires. The hydraulic system has a pump with
fluid flow rate of 21 gpm (79.6 lpm) or 30 gpm (113.7 lpm). The skid steer
loader has a rated operating capacity of 2190 lbs (995 kg) and tipping load of
4380 lbs (1990 kg). The boom breakout force is 3725 lbs (1690 kg), and bucket
breakout force is 6000 lbs (2725 kg).
| Engine Troubleshooting |
Engine difficult to start or will not start
There is air in the fuel system - Bleed the system.
Dirty fuel filter - Change filter element.
Burnt or defective injection nozzle - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
The valve clearance is not adjusted - Adjust valve clearance according to specifications.
Fuel injection pump malfunctioning - Replacement or repair required.
Engine stalls after starting
Plugged air filter - Clean or change filter.
Dirty fuel filter - Replace filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Fuel injectors are dirty or defective - Replace or clean fuel injectors.
Fuel injection pump is not operating properly - Change pump or rebuild it.
Diesel shuts off while driving
Engine is cold - Warm up to required temperature.
Clogged fuel filter - Change the filter element.
There is air in the fuel system - Bleed the system.
Dirty or faulty injection nozzles - Clean or replace injection nozzles.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Engine stalls when idling
Low idle speed adjustment is incorrect - Adjust as required.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Excessive valve clearance - Correct valve clearance needs to be set.
Diesel engine is losing power
Dirty air cleaner - Service or replace air cleaner.
Fuel injection nozzles are clogged or faulty - Clean or change injection nozzles.
Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly.
Valve out of adjustment - Have it adjusted.
Incorrectly adjusted low idle speed - Adjust low idling as recommended.
Dirty fuel hoses or lines - Clean fuel hoses and lines.
Damaged cylinder-head gasket - Replace the gasket as required.
Leaking or damaged piston rings - Replace the piston rings as required.
Engine is overheated
Engine coolant is insufficient - Top up coolant fluid and check system for leaks.
Engine oil level is insufficient - Add oil to the engine crankcase.
Faulty radiator cap or dirty radiator fins - Clean radiator or replace cap.
Fan belt is loose or defective - Belt replacement is recommended.
Diesel engine overloaded - Load reducing is recommended.
Oil pressure too low
Insufficient engine oil - Add oil as required.
Oil filter element clogged - Replace or service engine oil filter.
Different type of engine oil - Fill up with the correct oil viscosity.
Incorrect oil clearance in main bearing - Bearing needs to be changed.
Worn oil pump - Check and replace if necessary.
Engine knocking sound or abnormal noise
Engine oil level is insufficient - Fill up the engine oil.
Engine is not fully warmed up - Warm up to required temperature.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Incorrectly adjusted low idle speed - Correct low idle settings.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Faulty or misaligned connecting rod - Connecting rod must be aligned or replaced.
Broken or worn pistons - Install new pistons.
| Drive System Troubleshooting |
Machine will not move forward or backward
Hydraulic fluid level low - Add fluid as required.
Drive chain is damaged - Check drive chain and change faulty parts.
Worn or defective relief valve - Repair or replace relief valve.
Suction line or hydraulic filter is clogged - Service suction line or replace hydraulic filter.
Worn or defective hand or foot controls - Change or repair.
Damaged drive pump or motor - Repair or change faulty component.
Power is too low
Hydraulic oil filter is plugged - Check, clean, or change as necessary.
Relief valve is open or worn - Change or close relief valve.
Transmission components are faulty or damaged - Inspect and change faulty parts.
Damaged input drive shaft - Replace or service the drive shaft.
Air in hydraulic system - Need to bleed air.
Drive system keeps overheating
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Plugged hydraulic fluid filter - Replace or service hydraulic filter.
Defective relief valve - Rebuild or install a new relief valve.
Drive pump or hydraulic motor is damaged - Change or repair faulty component.
Hydraulic oil cooler is dirty - Clean the cooling fins.
Transmission overloading - Reduce the load.
Drive system is noisy
Oil viscosity is incorrect - Use oil of proper viscosity.
Air trapped in hydraulic system - Need to bleed air.
Damaged drive pump or hydraulic motor - Replace or repair faulty component.
Worn or damaged mechanical parts of drive system - Check drive system and change faulty components.
| Hydraulics Troubleshooting |
Hydraulic system overheats
Hydraulic pressure is not adjusted correctly - Correct setting is required.
Faulty or improperly adjusted main relief valve - Adjust or replace the relief valve.
Dirty hydraulic fluid - The fluid must be changed.
Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid.
Defective hydraulic pump - Install new pump or repair it.
Boom cannot be lowered or raised
Lift controls are damaged - Repair or replace.
Hydraulic pump not working - Install new pump or repair it.
Damaged hydraulic control valve - Repair or change hydraulic valve.
Hydraulic cylinder is defective - Repair or change hydraulic cylinder.
Hydraulic oil level low - Check and refill the hydraulic oil.
Bucket can't tilt
Damaged bucket controls - Change or repair.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Hydraulic control valve failure - Install a new hydraulic valve or repair it.
Bucket cylinder malfunction - Install a new cylinder or repair it.
Low hydraulic oil level - Fill the system to proper hydraulic oil level.
Boom or bucket functions slowly
Hydraulic pump is worn - Check pump flow and install new pump if necessary.
Oil leaks from hydraulic cylinder - Replace cylinder piston seals.
Low hydraulic oil level - Need to add oil.
Worn or unadjusted hydraulic control valve - Repair or adjust properly.
Hydraulic pressure loss - Adjust pressure as required.
Jerky operation of the bucket or boom
Air in the hydraulic system - Need to bleed air.
Hydraulic oil filter clogging - Clean or install new filter.
Dirty hydraulic fluid - Change hydraulic fluid.
Scratched cylinder rod or tube - Replace damaged component.
Excessive hydraulic pump noise
Lack of oil or hydraulic leakage - Top up hydraulic oil or remedy leakage in system.
Hydraulic filter clogging - Clean or replace the filter.
Suction line is clogged - Clean suction line as required.
Pump sucks air - Bleed air from hydraulics.
Pump parts are faulty - Rebuild or install new pump.
| Electrical Troubleshooting |
Battery does not charge
Corroded or loose electrical wire connections - Tighten or clean connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Battery failing - Use a new battery.
Damaged or loose belt - Belt needs to be adjusted or replaced.
Starter turns slowly
Battery voltage is low - Low battery charging, charge as required.
Battery will not hold charge - Service or change the battery.
Faulty battery terminals or disconnected cables - Connect wiring correctly or install new terminals.
Starter does not work
Battery is drained or worn - Change or recharge battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Low battery power - Battery needs to be recharged.
Starter motor failing - Replace or repair starter.
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| SKID STEER LOADERS SPECIFICATIONS |