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John Deere 326E Troubleshooting

The John Deere 326E skid steer loader is powered by 202.5 cu.in (3.3L) Yanmar 4TNV98CT 4-cylinder turbocharged intercooled diesel engine with a rated power of 70 hp (52.5 kW) at 2500 rpm. The John Deere 326E is equipped with a vertical-lift loader boom, one-speed or two-speed hydrostatic transmission, 100HD 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 29 gpm (109.9 lpm). The skid steer loader has a rated operating capacity of 2690 lbs (1220 kg) and tipping load of 5380 lbs (2445 kg). The lift height is 125.4" (3185 mm) to hinge pin, and dump height is 99.9" (2535 mm).

Engine Troubleshooting

Engine starts up hard or won't start
Air in fuel tank - Bleed fuel tank.
Clogged fuel filter - Filter maintenance required.
Fuel injection nozzles are clogged or faulty - If necessary, replace with a new nozzle.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is not correct - Need to adjust valve clearance.
Faulty fuel injection pump - Replacement or repair required.

Diesel starts and then shuts off
Plugged air filter - Clean or replace element.
Dirty fuel filter - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Fuel injectors are dirty or defective - Change or clean fuel injectors.
Fuel injection pump malfunction - Rebuild or install a new injection pump.

Diesel shuts off while driving
Low coolant temperature - Warm up the engine.
Clogged fuel filter - Change the filter element.
Air in fuel system - Bleed fuel system.
Clogged or defective injection nozzles - Service or change injection nozzles.
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.

Engine stops at low idle speed
Incorrect low idle speed adjustment - Adjustment required.
Fuel injection pump malfunctioning - Repair or install a new fuel pump.
Fuel injectors are dirty or defective - Clean fuel injectors or change it.
Valve clearance is not correct - Adjustment procedure required.

Diesel engine loses power
Air filter is dirty - Change or service air filter element.
Damaged or dirty injection nozzles - Replace injection nozzles.
Improper fuel injection pressure - Correct the pressure settings.
Valve clearance is wrong - Adjust to proper valve clearance.
Incorrect low idle speed adjustment - Correct low idle settings.
Fuel lines or hoses are clogged - Clean fuel system lines and hoses.
Blown cylinder head gasket - Install new cylinder head gasket.
Piston rings are broken or leaking - Replace piston rings.

Engine is overheated
Insufficient coolant fluid - Refill to the correct level and inspect system for leaks.
Engine oil level low - Need to add engine oil.
Radiator fins are dirty or radiator cap is defective - Clean radiator or change cap.
Fan belt is worn or faulty - Replace the fan belt.
Engine overloaded - Load reducing is recommended.

Oil pressure is insufficient
Not enough oil in the engine - Add oil as required.
Dirty oil filter - Service or replace engine oil filter.
Incorrect engine oil Drain crankcase and refill with correct oil.
Crankshaft bearing oil clearance is incorrect - Change bearings.
Oil pump failure - Repair or replace.

Abnormal engine noise or knocking
Low engine oil level - Check and refill engine oil.
Low coolant temperature - Warm up engine as required.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Low idle speed setting is not correct - Test and adjust.
Fuel injectors are faulty or clogged - Inspect fuel injectors and change as required.
Connecting rod is not aligned or worn - Need to align or replace the connecting rod.
Scored or worn pistons - Install new pistons.

Drive System Troubleshooting

Drive system does not work in either direction
Hydraulic oil level is low - Fill the system to proper hydraulic oil level.
Drive chain is worn - Inspect drive chain and replace faulty components.
Relief valve is stuck - Repair or install a new relief valve.
Plugged suction line or hydraulic filter - Change hydraulic filter or service suction line.
Defective hand or foot controls - Repair or replace.
Drive motor or pump is worn - Inspect and replace as necessary.

Power is too low
Dirty hydraulic oil filter - Replace hydraulic filter.
Faulty or opened relief valve - Replace or close relief valve.
Faulty or worn transmission components - Check and replace defective components.
Worn input drive shaft - Service or change faulty drive shaft.
Hydraulic system is leaking air - Bleed hydraulic system.

Drive system keeps overheating
Low hydraulic fluid level - Check and refill the hydraulic fluid.
Hydraulic fluid filter is plugged - Replace hydraulic filter.
Relief valve is damaged - Repair or install a new relief valve.
Drive pump or hydraulic motor is damaged - Repair or replace faulty component.
Clogged hydraulic oil cooler - Clean the cooling fins.
Drive system overload - Reduce the load.

Excessive noise
Incorrect oil viscosity - Drain and refill with correct oil.
Air leaks in hydraulic system - Bleed hydraulic system.
Defective drive pump or hydraulic motor - Repair or change faulty component.
Worn or damaged mechanical components of drive system - Inspect drive system and replace faulty components.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Adjust pressure as required.
Faulty or improperly adjusted main relief valve - Adjust relief valve or change if required.
Dirty hydraulic oil - Hydraulic oil change required.
Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid.
Hydraulic pump is faulty - Repair or change pump if required.

Lift arm cannot be raised or lowered
Faulty lift controls - Check and repair as required.
Damaged hydraulic oil pump - Change or repair hydraulic pump if required.
Hydraulic control valve failure - Install a new hydraulic valve or repair it.
Hydraulic cylinder not working - Replace or repair boom cylinder.
Hydraulic oil level low - Need to add oil.

Bucket fails to tilt
Bucket tilt controls are defective - Inspect and repair if necessary.
Hydraulic pump not working - Repair or change pump if required.
Hydraulic control valve failure - Repair or replace the valve.
Broken bucket cylinder - Repair or change cylinder.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.

Boom or bucket is working slowly
Defective hydraulic pump - Test pump flow rate and replace pump if required.
Oil leaks from hydraulic cylinder - Install new cylinder seals.
Hydraulic oil level low - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is faulty or out of adjustment - Set correctly or repair.
Hydraulic pressure has dropped - Set pressure correctly.

Lift arm or bucket is jerky
Air in hydraulic system - Bleed hydraulic system.
Dirty hydraulic oil filter element - Service or replace the hydraulic filter.
Hydraulic fluid is contaminated - Change hydraulic fluid.
Scratched cylinder rod or tube - Change defective component.

Hydraulic pump makes excessive noise
Low oil level or hydraulic leaks - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter is clogged - Clean or install new filter.
Suction line is clogged - Clean suction line as required.
Pump sucks air - Remove air from hydraulics.
Damaged pump parts - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Loose or corroded cable connections - Tighten or service connections.
Electrical terminal connectors are faulty - Replace terminal connectors.
Battery bad cell - Change the battery.
Loose or damaged belt - Adjust belt tension or replace belt.

Starter turning slow
Low battery output voltage - Battery needs to be recharged.
Battery will not hold charge - Service or change the battery.
Disconnected wiring or bad battery terminals - Check cable connections and replace or service terminals.

Starter doesn't crank
Battery is drained or worn - Change or recharge battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery capacity - Charge the battery.
Starter motor is faulty - Repair or replace starter.