New Holland L190 Skid Steer Troubleshooting

The New Holland L190 skid steer loader is powered by 274 cu.in (4.5L) FPT F4G E9454 4-cycle 4-cylinder direct injection turbocharged liquid-cooled diesel engine with a rated power of 83 hp (62 kW) at 2300 rpm. The New Holland L190 is equipped with two-speed hydrostatic transmission, 100 HD roller chains, and 14x17.5 standard tires. The hydraulic system has a pump with fluid flow rate of 21.9 gpm (83 lpm). The hydraulic pressure is 3050 psi (210 bar). The skid steer loader has a rated operating capacity of 2800 lbs (1270 kg) and tipping load of 5600 lbs (2450 kg). The boom lifting force is 6230 lbs (2825 kg), and bucket breakout force is 7670 lbs (3480 kg).

Engine Troubleshooting

Engine starts up hard or will not start

Air in the fuel system - Air bleeding.
Fuel filter element is clogged - Service the filter.
Fuel injection nozzles are faulty or clogged - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump is defective - Rebuild or change fuel pump.

Diesel starts but immediately stops

Plugged air filter - Change or service air filter element.
Clogged fuel filter - Change filter element.
Fuel injection pump has loose connections - Tighten the connections.
Defective or clogged fuel injectors - Inspect fuel injectors and change as required.
Fuel injection pump damage - Install a new fuel pump or repair.

Engine shuts off while running

Engine is not warmed up to required temperature - Warm up to required temperature.
Fuel filter element is clogged - Replace filter element.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Wrong setting of fuel injection pump timing - Adjust according to specifications.

Engine stalls while idle

Incorrect low idle speed adjustment - Correct low idle adjustment.
Fuel injection pump is not operating properly - Rebuild or install a new injection pump.
Defective fuel injectors - Change or clean fuel injectors.
Valve clearance is not correct - Check and adjust as required.

Lack of engine power

Dirty air cleaner - Clean or replace air cleaner element.
Fuel injection nozzles are clogged or faulty - Replace injection nozzles.
Fuel injection pressure is wrong - Correct the pressure settings.
Valve clearance is not correct - Need to adjust valve clearance.
Improperly adjusted low idle speed - Correct the settings.
Fuel lines or hoses clogging - Service fuel lines and hoses.
Damaged cylinder-head gasket - Gasket should be replaced.
Piston rings are damaged or leaking - Piston rings need to be replaced.

Engine overheats

Coolant level is low - Add coolant and check the components of cooling system.
Engine oil insufficient - Check and refill engine oil.
Clogged radiator core or damaged radiator cap - Change cap or clean radiator.
Fan belt slipping or worn - Change as required.
Engine overloaded - Load reducing is recommended.

Low oil pressure

Not enough oil in the engine - Fill the crankcase with oil.
Clogged oil filter element - Change or service engine oil filter.
Improper type of engine oil - Fill up with the proper oil viscosity.
Crankshaft bearing has excessive oil clearance - Bearings need to be reinstalled.
Oil pump failure - Check and replace if necessary.

Engine knocking sound or abnormal noise

Engine oil level is low - Check oil level and add oil as required.
Engine is cold - Warm up the engine.
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Damaged or clogged injectors - Clean fuel injectors or change it.
Connecting rod is defective or misaligned - Need to change or align the connecting rod.
Worn or scored pistons - Replace the pistons.

Drive System Troubleshooting

Drive system does not work in either direction

Hydraulic oil level is low - Check and refill the hydraulic oil.
Faulty drive chain - Inspect drive chain and replace defective parts.
Damaged input drive shaft - Rebuild or change.
Relief valve worn or defective - Change or repair relief valve.
Clogged suction line or hydraulic filter - Clean suction line or replace hydraulic filter.
Defective foot or hand controls - Inspect and repair if necessary.
Defective drive pump or motor - Change or repair faulty component.

Power is too low

Hydraulic oil filter is dirty - Change hydraulic filter.
Defective or open relief valve - Change or close relief valve.
Transmission parts are damaged or faulty - Inspect and change defective parts.
Input drive shaft is damaged - Replace or service the drive shaft.
Hydraulic system is leaking air - Bleed air from hydraulic system.

Drive system keeps overheating

Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Dirty hydraulic fluid filter - Replace or service hydraulic filter.
Relief valve is damaged - Service or change relief valve.
Hydraulic motor or drive pump is worn - Inspect and change as required.
Dirty oil cooler - Clean the cooling fins.
Drive system overload - Reduce the load.

Excessive noise

Oil viscosity is wrong - Use oil of correct viscosity.
Air in the hydraulic system - Need to bleed air.
Hydraulic motor or drive pump is defective - Inspect and replace as necessary.
Defective or worn mechanical parts of drive system - Inspect the components and repair as required.

Hydraulics Troubleshooting

Hydraulic system overheated

Hydraulic pressure is not correct - Hydraulic pressure must be set correctly.
Main relief valve improper adjustment or failure - Adjust or replace the relief valve.
Hydraulic oil is dirty - Fill up with fresh hydraulic oil.
Not enough hydraulic fluid in the system - Add fluid to the hydraulic system.
Worn hydraulic oil pump - Change or repair hydraulic pump if required.

Boom does not raise or lower

Lift controls are damaged - Change or repair.
Damaged hydraulic oil pump - Repair or change pump if required.
Hydraulic control valve is faulty - Replace or repair the valve.
Hydraulic cylinder failure - Repair or change hydraulic cylinder.
Hydraulic fluid is insufficient - Fill the system to proper hydraulic fluid level.

Bucket won't move

Damaged bucket controls - Repair or change.
Hydraulic pump failure - Change or repair hydraulic pump if required.
Defective hydraulic control valve - Replace or repair the valve.
Faulty hydraulic bucket cylinder - Repair or replace cylinder.
Insufficient hydraulic oil - Check and refill the hydraulic oil.

Slow boom or bucket operation

Worn hydraulic oil pump - Check the pump capacity and replace pump if required.
Hydraulic cylinder leaking - Correct leakage by changing the seals.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Defective or not adjusted hydraulic control valve - Adjust correctly or repair.
Low hydraulic pressure - Hydraulic pressure must be set correctly.

Bucket or boom is moving jerkily

Air in hydraulic system - Bleed air from hydraulic system.
Dirty hydraulic oil filter - Replace or clean the filter.
Hydraulic fluid contamination - Fill up with fresh hydraulic fluid.
Cylinder rod or tube is scratched - Replace damaged component.

Hydraulic pump is excessively noisy

Hydraulic leakage or lack of oil - Top up hydraulic oil or remedy leakage in system.
Dirty hydraulic filter - Change or clean oil filter.
Suction line is dirty - Need to service the suction line.
Air in hydraulic pump - Need to bleed air.
Pump parts are worn out - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery cannot be charged

Electrical cable connections are corroded or loose - Clean or tighten wiring connections.
Battery terminal clamps are defective - Install new terminal clamps.
Battery is worn - Battery change required.
Belt is worn or loose - Adjust belt tension or change the belt.

Starter turns slowly

Low battery voltage - Charge the battery.
Battery runs out quickly - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.

Starter is not working

Battery is discharged or worn - Charge or replace the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery power is low - Battery is drained, recharge it.
Starter motor is faulty - Starter should be changed.