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New Holland L320 Troubleshooting

The New Holland L320 skid steer loader is powered by 133.8 cu.in (2.2L) Shibaura N844LT 4-cylinder turbocharged diesel engine with a rated power of 57 hp (42.4 kW) at 2900 rpm. The New Holland L320 is equipped with a vertical-lift loader boom, one-speed or two-speed hydrostatic transmission, ASA 80 drive chains, and 12x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 19 gpm (72 lpm) or 28.8 gpm (109 lpm). The skid steer loader has a rated operating capacity of 2000 lbs (905 kg) and tipping load of 4000 lbs (1810 kg). The lift height is 121 inches (3075 mm) to hinge pin, and dump height is 94.6 inches (2405 mm).

Engine Troubleshooting

Engine starts up hard or won't start
Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugging - Clean the filter element.
Defective or clogged injection nozzle - If necessary, replace with a new nozzle.
Water or dirt in fuel system - Drain, flush, and service the system.
Excessive valve clearance - Check and adjust.
Faulty fuel injection pump - Replace or repair injection pump.

Engine starts but stalls immediately
Dirty air cleaner - Clean or replace element.
Fuel filter element is dirty - Change filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Defective or clogged fuel injectors - Replace or clean fuel injectors.
Fuel injection pump is faulty - Replace or repair injection pump.

Engine shuts off while running
Engine is cold -Warm up the engine as required.
Fuel filter element is dirty - Replace filter element.
Air in the fuel system - Air bleeding.
Defective injection nozzle - Inspect nozzles and replace if necessary.
Improper setting of fuel injection pump timing - Set up as recommended.

Engine stalls while idle
Incorrect low idle setting - Normalize low idle speed.
Fuel injection pump is not operating properly - Replace or repair injection pump.
Defective fuel injectors - Test and replace fuel injectors if necessary.
Valve out of adjustment - Have it adjusted.

Engine lacks power
Clogged air cleaner - Clean or change.
Fuel injection nozzles are damaged - Service or change injection nozzles.
Insufficient fuel injection pressure - Test fuel injection pressure and adjust it correctly.
Valve clearance is not correct - Correct valve clearance.
Incorrect low idle speed adjustment - Need to adjust idle speed.
Fuel hoses or lines are dirty - Clean fuel lines and hoses.
Cylinder head gasket is worn - Install a new gasket.
Defective or worn piston rings - Replace piston rings.

Engine is overheated
Engine has a lack of coolant - Refill to the correct level and inspect system for leaks.
Engine oil level is insufficient - Check oil level and add oil as required.
Clogged radiator core or leaking radiator cap - Replace cap or clean radiator.
Fan belt is broken or worn - Fan belt must be replaced.
Engine is under excessive load - Load reducing required.

Low oil pressure
Not enough oil in the engine - Check oil level and add oil as required.
Dirty oil filter element - Clean or replace engine oil filter element.
Different type of engine oil - Fill up with the proper oil viscosity.
Crankshaft bearing oil clearance is excessive - Bearings need to be reinstalled.
Oil pump is worn or damaged - Repair or change.

Engine knocking sound or abnormal noise
Low engine oil level - Checking oil level and add if necessary.
Engine has not warmed up to the recommended temperature - Warm up to required temperature.
Timing of fuel injection pump is incorrect - Set the fuel pump timing correctly.
Incorrect low idle speed adjustment - Adjustment required.
Fuel injector fault - Change or clean fuel injectors.
Connecting rod is not aligned or worn - Align or change connecting rod.
Pistons are scored or worn - Replace the pistons as required.

Drive System Troubleshooting

Drive system сan't work in either direction
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.
Faulty drive chain - Inspect drive chain and replace faulty components.
Worn or defective relief valve - Change or repair relief valve.
Clogged hydraulic filter or suction line - Check, clean, or replace if required.
Foot or hand controls are defective - Check and repair as required.
Drive motor or pump is defective - Repair or replace faulty component.

Power is too low
Plugged hydraulic oil filter - Replace or clean hydraulic filter.
Open or damaged relief valve - Close or replace relief valve.
Transmission components are damaged or faulty - Inspect and change faulty parts.
Damaged input drive shaft - Change or repair faulty drive shaft.
Hydraulic system is leaking air - Bleed air from system.

Drive system overheats
Hydraulic fluid level low - Check and refill the hydraulic fluid.
Plugged hydraulic fluid filter - Change or service hydraulic filter.
Relief valve is stuck - Repair or change.
Hydraulic motor or drive pump is defective - Check and repair if required.
Dirty oil cooler - Cooling fins should be cleaned.
Drive system overload - Reduce the load.

Drive system is noisy
Oil viscosity is incorrect - Drain and refill with correct oil.
Hydraulic system is leaking air - Air bleeding is required.
Hydraulic motor or drive pump is worn - Check and repair if required.
Mechanical parts of drive system are worn or damaged - Inspect the components for defect or damage and repair as needed.

Hydraulics Troubleshooting

Hydraulic system overheats
Hydraulic pressure is not correct - Adjust pressure correctly.
Faulty or improperly adjusted main relief valve - Adjust relief valve or change if required.
Dirty hydraulic fluid - Fill up with fresh hydraulic fluid.
Lack of hydraulic oil - Check oil level and add hydraulic oil as required.
Faulty hydraulic oil pump - Install new pump or repair it.

Boom fails to lift or drop
Lift controls malfunction - Change or repair.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Hydraulic cylinder failure - Install a new boom cylinder or repair it.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.

Bucket can't tilt
Defective bucket controls - Repair or replace.
Defective hydraulic pump - Replace or repair pump if necessary.
Hydraulic control valve malfunction - Install a new hydraulic valve or repair it.
Bucket cylinder failure - Change or repair cylinder.
Insufficient hydraulic oil - Check and refill the hydraulic oil.

Slow bucket or lift arm operation
Faulty hydraulic oil pump - Check pump flow and change pump if necessary.
Hydraulic cylinder leaking - Cylinder seals need to be replaced.
Hydraulic fluid level low - Add fluid as required.
Worn or unadjusted hydraulic control valve - Set properly or repair.
Low hydraulic pressure - Adjust it correctly.

Bucket or boom jerks when working
Air in the hydraulic system - Bleed air from system.
Hydraulic oil filter is clogged - Service or change the hydraulic filter.
Hydraulic fluid is dirty - Change hydraulic fluid.
Cylinder rod or tube is scuffed - Replace failed component.

Excessive hydraulic pump noise
Leaking hydraulic system or insufficient oil level - Refill hydraulic oil or repair leaks in system.
Clogged hydraulic filter - Service or change hydraulic filter.
Suction line clogging - Need to service the suction line.
Pump sucks air - Need to bleed air.
Pump components are damaged - Rebuild or change hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Wiring connections are corroded or loose - Tighten or clean connections.
Battery terminal connectors are defective - Replace terminal connectors.
Worn-out battery - Change the battery.
Worn or loose belt - Adjust belt tension or replace belt.

Starter cranks slowly
Low battery power - Recharge the battery.
Battery runs out quickly - Service or replace the battery.
Wires are disconnected or battery terminals are corroded - Check cables and clean or change terminals.

Starter is not working
Battery is drained or defective - Replace or charge as required.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output - Battery is drained, charge it.
Defective starter motor - Starter should be replaced.