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John Deere 325G Troubleshooting

The John Deere 325G compact track loader is powered by 202.5 cu.in (3.3L) Yanmar 4TNV98CT 4-cylinder turbocharged diesel engine with a rated power of 70 hp (52.5 kW) at 2500 rpm. The John Deere 325G is equipped with 1-speed or 2-speed hydro transmission, vertical-lift loader boom, and 12.6" (320 mm) or 15.8" (400 mm) rubber tracks with steel inserts. The hydraulic system has a pump with fluid flow rate of 21 gpm (78 lpm). The hydraulic pressure is 3450 psi (238 bar). The track loader has a rated operating capacity of 2590 lbs (1176 kg) and tipping load of 7400 lbs (3360 kg). The lift height is 126" (3200 mm) to hinge pin, and dump height is 102" (2590 mm).

Engine Troubleshooting

Engine starts up hard or will not start
Air trapped in fuel system - Bleed air.
Fuel filter element is dirty - Service the filter.
Defective or clogged 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 incorrect - Adjust valve clearance according to specifications.
Damaged fuel injection pump - Repair or change injection pump.

Engine starts but immediately stalls
Clogged air cleaner - Clean or change.
Fuel filter element is dirty - Change filter element.
Fuel injection pump is leaking - Repair any leaks.
Damaged or clogged injectors - Replace fuel injectors.
Fuel injection pump is broken - Repair or replace injection pump.

Engine stops unexpectedly during operation
Engine not warmed up - Warm up engine as required.
Clogged fuel filter - Replace filter element.
There is air in the fuel system - Bleed the system.
Clogged injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pump timing is not adjusted - Check the fuel injection pump timing adjustment.

Engine stops when idling
Low idle speed setting is incorrect - Correct low idle adjustment.
Damaged fuel injection pump - Repair or change injection pump.
Defective fuel injectors - Test and replace fuel injectors if necessary.
Incorrect valve clearance - Adjust valve clearance according to specifications.

Engine power loss
Air filter is dirty - Clean or change.
Faulty or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Improper fuel injection pressure - Test fuel injection pressure and adjust it correctly.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.
Incorrect low idle speed adjustment - Adjustment required.
Fuel hoses or lines are dirty - Clean fuel hoses and lines.
Blown cylinder head gasket - Gasket should be replaced.
Worn or broken piston rings - Piston rings replacement required.

Engine overheating
Low coolant level - Add coolant fluid and inspect the cooling system for leaks.
Engine oil level is low - Fill up the engine oil.
Radiator fins are dirty or radiator cap is defective - Install new cap or clean radiator.
Loose or damaged fan belt - Change the fan belt.
Engine overloaded - Reduce engine load.

Oil pressure is insufficient
Oil level is insufficient - Add oil to the engine crankcase.
Oil filter element is dirty - Service or replace engine oil filter.
Incorrect engine oil Use proper viscosity oil.
Incorrect oil clearance in main bearing - Change bearings.
Oil pump is defective - Repair or change.

Abnormal engine noise or knocking
Not enough engine oil - Fill up the engine oil.
Engine is not fully warmed up - Warm up the engine.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Low idle speed setting is incorrect - Test and adjust.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Misaligned or defective connecting rod - Align or replace connecting rod.
Worn or scored pistons - Have pistons replaced.

Drive System Troubleshooting

Drive system will not operate in either direction
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Blocked or defective undercarriage tracks - Correct blockage or repair tracks.
Relief valve is defective - Change or repair relief valve.
Suction line or hydraulic filter is dirty - Service suction line or replace hydraulic filter.
Worn or damaged foot or hand controls - Repair or replace.
Drive motor or pump failure - Repair or replace faulty component.

Machine will not move straight or moves jerkily
Damaged or jammed undercarriage tracks - Repair or remove jamming.
Tracks are sagging or worn - Replace tracks or adjust track sag with tension.
Debris, dirt, or foreign objects stuck in undercarriage track frame - Clean undercarriage track frame, remove foreign objects and debris.

Loss of power
Plugged hydraulic oil filter - Replace hydraulic filter.
Open or faulty relief valve - Close or replace relief valve.
Faulty or damaged transmission components - Inspect and replace faulty parts.
Input drive shaft is stuck - Repair or replace faulty drive shaft.
Air trapped in hydraulic system - Need to bleed air.

Drive system overheating
Insufficient hydraulic oil - Check and refill the hydraulic oil.
Clogged hydraulic fluid filter - Change hydraulic filter.
Worn or damaged relief valve - Service or change relief valve.
Defective drive pump or hydraulic motor - Inspect and replace as necessary.
Oil cooler is clogged - Clean the cooling fins.
Drive system overloaded continuously - Load needs to be reduced.

Excessive noise
Wrong oil viscosity - Use proper oil viscosity.
Air in hydraulic system - Bleed air from system.
Hydraulic motor or drive pump is defective - Change or repair faulty component.
Mechanical parts of drive system are worn or damaged - Inspect drive system and replace faulty parts.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure is not adjusted correctly - Hydraulic pressure must be set correctly.
Faulty or improperly adjusted main relief valve - Replace or set up the relief valve.
Hydraulic oil is dirty - The oil must be changed.
Hydraulic fluid level is low - Need to add fluid.
Faulty hydraulic oil pump - Repair or install new hydraulic pump.

Boom fails to lift or drop
Lift controls failure - Repair or replace.
Hydraulic pump not working - Repair or replace pump if necessary.
Hydraulic control valve malfunction - Repair or replace the valve.
Hydraulic cylinder not working - Install a new boom cylinder or repair it.
Hydraulic oil is insufficient - Need to add oil.

Bucket tilt does not work
Faulty bucket tilt controls - Change or repair.
Hydraulic pump is broken - Repair or change pump if required.
Hydraulic control valve is defective - Install a new valve or repair it.
Hydraulic bucket cylinder not working - Change or repair cylinder.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.

Bucket or lift arm is working slowly
Hydraulic pump is worn - Check pump flow and change pump if necessary.
Hydraulic cylinder oil leakage - Install new cylinder seals.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is unadjusted or worn - Repair or adjust correctly.
Hydraulic system loosing pressure - Correct adjustment is required.

Bucket or boom is jerky
Air trapped in hydraulic system - Bleed hydraulic system.
Hydraulic oil filter element clogging - Clean or install new filter.
Contaminated hydraulic oil - Hydraulic oil change required.
Cylinder rod or tube is scratched - Change failed component.

Hydraulic pump is excessively noisy
Hydraulic leaks or low oil level - Add hydraulic oil or correct system leaks.
Clogged hydraulic filter - Clean or change the filter.
Suction line is clogged - Suction line must be serviced.
Air enters the pump - Air bleeding is required.
Damaged pump parts - Rebuild or change hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged
Wiring connections are loose or corroded - Service or tighten connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Battery is worn - Install a new battery.
Belt is damaged or loose - Belt needs to be adjusted or changed.

Starter cranks slowly
Low battery capacity - Battery needs to be recharged.
Battery won’t hold charge - Service battery or replace it.
Bad battery terminals or disconnected wiring - Check cable connections and change or clean terminals.

Starter does not work
Battery is low or faulty - Charge or change the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery power - Battery needs to be recharged.
Starter motor failing - Repair or change starter.