New Holland LS150 Skid Steer Troubleshooting

The New Holland LS150 skid steer loader driveline system components: a 91.3 cu.in (1.5L) Shibaura N843H 3-cylinder naturally aspirated liquid-cooled diesel engine with a rated power of 38 hp (28.3 kW), and 1-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 12 gal/min (45.4 l/min). The system relief pressure is 2600 psi (177 bar). The New Holland LS150 is equipped with 50/80 HD roller chains and 10x16.5 tires. The skid steer loader has a boom lifting force of 2400 lbs (1090 kg) and bucket breakout force of 3500 lbs (1590 kg). The rated operating capacity is 1400 lbs (635 kg), and tipping load is 2850 lbs (1295 kg).

Engine Troubleshooting

Diesel engine hard to start or doesn't start

Air in fuel tank - Bleed fuel tank.
Fuel filter element is clogged - Change filter element.
Fuel injection nozzles are faulty or clogged - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
Valve out of adjustment - Adjust valve clearance according to specifications.
Fuel injection pump malfunction - Change or repair the pump.

Engine starts and then shuts off

Air filter is plugged - Clean or change filter.
Fuel filter element is dirty - Replace the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Damaged or clogged injectors - Clean or replace fuel injectors.
Fuel injection pump is defective - Repair or install new pump.

Engine shuts off suddenly while running

Engine is not preheated - Warm up engine as required.
Fuel filter element is dirty - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Clogged or defective injection nozzles - Check and replace nozzles if required.
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.

Engine stops while idling

Incorrectly set low idle speed - Adjust low idling as recommended.
Fuel injection pump is defective - Change pump or rebuild it.
Fuel injector fault - Change or clean fuel injectors.
The valve clearance is not adjusted - Adjust valve clearance according to specifications.

Diesel engine is losing power

Clogged air cleaner - Clean or replace element.
Fuel injection nozzles are clogged or faulty - Clean or replace injection nozzles.
Incorrect fuel injection pressure - Test fuel injection pressure and adjust it correctly.
The valve clearance is not adjusted - Adjust valve clearance according to specifications.
Low idle speed adjustment is incorrect - Adjust low idle speed.
Restricted fuel lines or hoses - Service fuel hoses and lines.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Piston rings are defective or leaking - Piston rings need to be replaced.

Engine overheated

Not enough coolant - Add coolant fluid and inspect the cooling system for leaks.
Low engine oil level - Check oil level and add oil as required.
Clogged radiator fins or leaking radiator cap - Replace cap or clean radiator.
Loose or damaged fan belt - Replace as required.
Engine overloaded - Reduce load on the engine.

Insufficient oil pressure

Oil level is insufficient - Checking oil level and add if necessary.
Dirty oil filter element - Clean or change engine oil filter.
Wrong oil viscosity - Use oil of proper viscosity.
Crankshaft bearing has incorrect oil clearance - Bearing replacement required.
Oil pump failure - Repair or replace.

Engine noise or knocking

Insufficient engine oil - Check oil level and add oil as required.
Engine is cold - Warm up the engine as required.
Timing of fuel injection pump is incorrect - Set up as recommended.
Low idle speed adjustment is incorrect - Test and adjust.
Clogged or defective injectors - Inspect fuel injectors and change as required.
Connecting rod is worn or misaligned - Align or replace connecting rod.
Pistons are worn or broken - Replace the pistons.

Drive System Troubleshooting

Drive system сan't work in either direction

Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Drive chain malfunction - Check drive chain and change defective components.
Worn input drive shaft - Replace or service the drive shaft.
Worn or damaged relief valve - Rebuild or install a new relief valve.
Hydraulic filter or suction line is plugged - Clean suction line or change hydraulic filter.
Faulty foot or hand controls - Repair or replace.
Drive motor or pump is defective - Repair or replace faulty component.

Lack of power

Plugged hydraulic oil filter - Check, clean, or replace as required.
Relief valve is damaged or open - Replace or close relief valve.
Worn or faulty transmission components - Check and change defective components.
Input drive shaft is stuck - Repair or install a new drive shaft.
Air trapped in hydraulic system - Bleed air from hydraulic system.

Drive system is overheated

Hydraulic oil level is low - Check and refill the hydraulic oil.
Hydraulic fluid filter is clogged - Check, clean, or change as necessary.
Relief valve is damaged or worn - Rebuild or install a new relief valve.
Damaged drive pump or hydraulic motor - Check and repair if required.
Hydraulic oil cooler is dirty - Cooling fins need to be cleaned.
Transmission overloading - Load needs to be reduced.

Excessive noise

Oil viscosity is wrong - Use proper oil viscosity.
Hydraulic system is leaking air - Bleed air from system.
Damaged drive pump or hydraulic motor - Check and repair if required.
Defective mechanical components of drive system - Check the components and replace if necessary.

Hydraulics Troubleshooting

Hydraulic system overheated

Hydraulic pressure is incorrect - Correct adjustment is required.
Main relief valve is defective or unadjusted - Adjust or change relief valve.
Hydraulic oil is contaminated - The oil must be changed.
Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required.
Hydraulic pump is worn - Repair or install new hydraulic pump.

Lift arm cannot be raised or lowered

Damaged lift controls - Change or repair.
Hydraulic pump not working - Replace or repair pump if necessary.
Hydraulic control valve malfunction - Repair or change hydraulic valve.
Damaged hydraulic cylinder - Change or repair lift cylinder.
Insufficient hydraulic oil - Need to add oil.

Bucket fails to tilt

Damaged bucket controls - Replace or repair.
Defective hydraulic pump - Repair or replace pump if necessary.
Hydraulic control valve is defective - Repair or replace hydraulic valve.
Hydraulic bucket cylinder is defective - Replace or repair cylinder.
Hydraulic oil is insufficient - Need to add oil.

Slow bucket or lift arm action

Hydraulic pump is defective - Flow-rate pump and change pump if necessary.
Hydraulic cylinder leaking - Change cylinder piston seals.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.
Hydraulic control valve is not set properly or defective - Adjust properly or repair.
Hydraulic system loosing pressure - Adjust pressure as required.

Bucket or boom is jerky

Air trapped in hydraulic system - Air bleeding is required.
Dirty hydraulic oil filter element - Replace or clean the filter.
Dirty hydraulic oil - Hydraulic oil change required.
Cylinder tube or rod scoring - Change damaged component.

Hydraulic pump is noisy

Hydraulic leakage or low oil level - Refill hydraulic oil or repair leaks in system.
Hydraulic filter is clogged - Clean or replace the filter.
Plugged suction line - Clean suction line as required.
Pump sucks air - Bleed air.
Damaged pump parts - Rebuild or install new pump.

Electrical Troubleshooting

Battery won’t charge

Wiring connections are loose or corroded - Tighten or service cable connections.
Electrical terminal connectors are defective - Terminal connectors need to be changed.
Battery is worn - Change the battery.
Worn or loose belt - Change belt or adjust belt tension.

Starter motor turns slow

Battery capacity is low - Battery needs to be recharged.
Battery will not hold charge - Battery needs service or replacement.
Battery terminals are corroded or wires are disconnected - Check wiring and clean or replace terminals.

Starter motor won't turn

Battery is discharged or worn - Replace or charge as required.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Low battery voltage - Battery needs to be recharged.
Starter motor is damaged - Repair or replace starter.