New Holland L150 Skid Steer Troubleshooting

The New Holland L150 skid steer loader is powered by 91.3 cubic inches (1.5 L) Shibaura N843H three-cylinder indirect injection liquid-cooled diesel engine with a rated power of 38 hp (28.3 kW) at 3200 rpm. The New Holland L150 is equipped with a single-speed hydrostatic transmission, 50/80 HD roller chains, and 10x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 11.6 gpm (44 lpm). The hydraulic pressure is 2500 psi (172 bar). The skid steer loader has a rated operating capacity of 1350 lbs (612 kg) and tipping load of 2700 lbs (1225 kg). The lift height is 115.8 inches (2940 mm) to hinge pin, and dump height is 92.2 inches (2340 mm).

Engine Troubleshooting

Engine starts hard or will not start

Air in fuel system - Bleed fuel system.
Dirty fuel filter - Change filter element.
Damaged or dirty injection nozzles - Check injection nozzles and replace if required.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is not correct - Have it adjusted.
Faulty fuel injection pump - Rebuild or replace pump.

Diesel starts and stops

Plugged air cleaner - Service or replace air cleaner.
Fuel filter element is clogged - Change filter element.
Fuel injection pump has loose connections - Tighten the connections.
Dirty or defective injectors - Clean or replace fuel injectors.
Defective fuel injection pump - Install a new fuel pump or repair.

Engine stops suddenly during operation

Coolant temperature is low - Warm up the engine.
Fuel filter element is dirty - Clean or change the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Check injection nozzles and replace if required.
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.

Engine shuts off while idling

Incorrect low idle setting - Adjust low idle speed.
Fuel injection pump failure - Repair or install new pump.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
The valve clearance is incorrect - Adjustment procedure required.

Diesel engine loses power

Air filter is dirty - Service or replace the air filter.
Faulty or dirty injection nozzles - Service or change injection nozzles.
Uneven fuel injection pressure - Correct the pressure settings.
Valve out of adjustment - Have it adjusted.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Clogged fuel lines or hoses - Service fuel lines and hoses.
Blown cylinder head gasket - Cylinder-head gasket replacement required.
Damaged or leaking piston rings - Replace piston rings.

Engine overheated

Engine has a lack of coolant - Add coolant fluid and inspect the cooling system for leaks.
Not enough engine oil - Check and refill engine oil.
Defective radiator cap or clogged radiator fins - Clean radiator or change cap.
Fan belt is loose or defective - The fan belt needs to be replaced.
Engine is overloaded - Load reducing is recommended.

Oil pressure is low

Engine oil level low - Check and refill the oil.
Oil filter clogging - Replace or clean engine oil filter element.
Oil grade or viscosity is wrong - Use proper viscosity oil.
Incorrect oil clearance in crankshaft bearing - Install new bearings.
Oil pump is defective - Repair or replace.

Abnormal engine knocking or noise

Engine oil level low - Checking oil level and add if necessary.
Low coolant temperature - Warm up the engine.
Fuel injection pump timing is not adjusted - Use the correct fuel injection pump timing adjustment.
Low idle speed setting is not correct - Correct low idle adjustment.
Clogged or defective injectors - Inspect fuel injectors and change as required.
Connecting rod is defective or not aligned - Alignment procedure or replacement is required.
Pistons are broken or worn - Replace the pistons as required.

Drive System Troubleshooting

Drive system won't operate in either direction

Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.
Faulty drive chain - Inspect drive chain and replace defective parts.
Input drive shaft is damaged - Change or repair.
Relief valve is damaged or worn - Change or repair defective relief valve.
Hydraulic filter or suction line is plugged - Clean suction line or change hydraulic filter.
Faulty hand or foot controls - Repair or change.
Defective drive pump or motor - Inspect and change as required.

Power is too low

Clogged hydraulic oil filter - Check, clean, or change as necessary.
Relief valve is worn or opened - Close or change relief valve.
Transmission parts are damaged or faulty - Inspect and change defective parts.
Input drive shaft malfunction - Service or change faulty drive shaft.
There is air in the hydraulic system - Bleed air from hydraulic system.

Drive system overheats

Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Plugged hydraulic fluid filter - Replace or service hydraulic filter.
Relief valver is broken - Rebuild or install a new relief valve.
Drive pump or hydraulic motor malfunction - Repair or change faulty component.
Hydraulic oil cooler is dirty - Cooling fins should be cleaned.
Overloaded drive system - Reduce loading.

Excessive noise

Oil viscosity is incorrect - Use proper oil viscosity.
Air in the hydraulic system - Bleed hydraulic system.
Hydraulic motor or drive pump is defective - Repair or replace faulty component.
Mechanical parts of drive system are damaged or worn - Inspect drive system and replace faulty components.

Hydraulics Troubleshooting

Hydraulic system overheats

Hydraulic pressure incorrectly adjusted - Set pressure correctly.
Faulty or improperly adjusted main relief valve - Adjust or change relief valve.
Hydraulic oil is contaminated - Hydraulic oil change required.
Hydraulic fluid level is low - Need to add fluid.
Hydraulic pump is defective - Install new pump or repair it.

Boom fails to lift or drop

Lift controls are defective - Repair or change.
Defective hydraulic pump - Repair or change pump if required.
Hydraulic control valve failure - Install a new valve or repair it.
Damaged hydraulic cylinder - Install a new boom cylinder or repair it.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.

Bucket can't tilt

Bucket controls are faulty - Repair or replace.
Defective hydraulic pump - Repair or replace pump if necessary.
Faulty hydraulic control valve - Install a new valve or repair it.
Bucket cylinder malfunction - Repair or install a new cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Bucket or lift arm moves slowly

Worn hydraulic oil pump - Check pump performance and change it if necessary.
Leaking hydraulic cylinder - Install new cylinder seals.
Insufficient hydraulic oil - Check and refill the hydraulic oil.
Damaged or incorrect adjusted hydraulic control valve - Repair or adjust correctly.
Hydraulic system loosing pressure - Hydraulic pressure must be set correctly.

Bucket or boom is moving jerkily

Air trapped in hydraulic system - Bleed air from system.
Hydraulic oil filter element is clogged - Clean or install new filter.
Contaminated hydraulic oil - Hydraulic oil change required.
Cylinder tube or rod scoring - Change damaged component.

Hydraulic pump is excessively noisy

Hydraulic leaks or low oil level - Repair hydraulic leaks or add oil as required.
Hydraulic filter is dirty - Service or replace hydraulic filter.
Clogged suction line - Need to clean the suction line.
Air trapped in hydraulic pump - Air bleeding is required.
Pump parts are damaged - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery will not charge

Corroded or loose wire connections - Service or tighten cable connections.
Faulty electrical terminal connectors - Change terminal connectors.
Faulty cell in battery - Use a new battery.
Belt is defective or loose - Replace belt or adjust belt tension.

Starter turning slow

Low battery capacity - Recharge the battery.
Battery is draining quickly - Service charging system or replace battery.
Corroded battery terminals or disconnected wires - Check battery wires and service terminals.

Starter doesn't crank

Battery is low or faulty - Replace or charge as required.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery voltage - Battery needs to be recharged.
Defective starter motor - Starter should be replaced.