New Holland L175 Skid Steer Troubleshooting

The New Holland L175 skid steer loader driveline system components: a 135 cu.in (2.2L) Shibaura N844LT 4-cycle 4-cylinder turbocharged liquid-cooled diesel engine with a rated power of 60 hp (45 kW), and 1-speed or 2-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 17.2 gal/min (65.2 l/min). The system pressure is 2500 psi (172 bar). The New Holland L175 is equipped with 80 HD roller chains and 12x16.5 tires. The skid steer loader has a boom lifting force of 3000 lbs (1360 kg) and bucket breakout force of 4312 lbs (1955 kg). The rated operating capacity is 2000 lbs (907 kg), and tipping load is 4000 lbs (1814 kg).

Engine Troubleshooting

Engine starts up hard or won't start

Air in fuel system - Bleed fuel system.
Fuel filter plugging - Clean the filter or install new filter element.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Incorrect valve clearance - Adjust valve clearance.
Fuel injection pump is not operating properly - Repair or replace injection pump.

Diesel starts and then shuts off

Air cleaner is clogged - Install new air cleaner element.
Fuel filter plugging - Change or clean the filter element.
Fuel injection pump has loose connections - Tighten the connections.
Clogged or defective injectors - Replace or clean fuel injectors.
Fuel injection pump is damaged - Rebuild or install a new injection pump.

Engine stalls after running

Engine not warmed up - Warm up engine as required.
Clogged fuel filter - Clean the filter or install new filter element.
Air in the fuel system - Air bleeding.
Faulty or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel injection pump timing is wrong - Adjust according to specifications.

Engine stalls at low idle speed

Too low idle RPM - Correct low idle adjustment.
Defective fuel injection pump - Repair or install a new fuel pump.
Clogged or defective injectors - Clean or replace fuel injectors.
Improper valve clearance - Check and adjust as required.

Engine power is too low

Air filter is clogged - Clean or change filter.
Fuel injection nozzles are damaged - Test injection nozzles and change if necessary.
Insufficient fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
The valve clearance is incorrect - Check and adjust as required.
Incorrectly set low idle speed - Correct low idle settings.
Clogged fuel lines or hoses - Service fuel lines and hoses.
Cylinder-head gasket is leaking - Install new cylinder head gasket.
Piston rings are leaking or defective - Piston rings need to be replaced.

Engine overheats

Not enough coolant - Add coolant fluid and inspect the cooling system for leaks.
Lack of engine oil - Fill up the oil to required level.
Radiator fins are clogged or radiator cap is faulty - Change cap or clean radiator.
Fan belt slipping or worn - Fan belt must be replaced.
Engine overload - Load reducing is recommended.

Insufficient oil pressure

Oil level is insufficient - Fill up the engine oil.
Oil filter clogged - Clean or change engine oil filter.
Different type of engine oil - Use correct viscosity oil.
Excessive oil clearance of crankshaft bearing - Bearing replacement required.
Oil pump is worn or damaged - Repair or change.

Abnormal engine knocking or noise

Not enough engine oil - Need to add engine oil.
Engine has not warmed up to required temperature - Warm up to required temperature.
Fuel injection pump timing is not adjusted - Set the fuel pump timing correctly.
Too low idle RPM - Correct the settings.
Fuel injector fault - Change or clean fuel injectors.
Connecting rod misalignment or failure - Connecting rod needs to be replaced or aligned.
Piston wear or scoring - Install new pistons.

Drive System Troubleshooting

Machine will not move forward or backward

Hydraulic oil level is low - Check and refill the hydraulic oil.
Worn drive chain - Inspect drive chain and replace defective parts.
Input drive shaft is not working properly - Drive shaft need to be replaced or repair.
Faulty relief valve - Relief valve need to be replaced or repair.
Suction line or hydraulic filter is plugged - Replace hydraulic filter or clean suction line.
Faulty foot or hand controls - Repair or replace.
Drive pump or motor is damaged - Check and repair if required.

Power is too low

Dirty hydraulic oil filter - Change or clean hydraulic filter.
Opened or worn relief valve - Close or change relief valve.
Faulty or damaged transmission components - Inspect and replace defective parts.
Input drive shaft is stuck - Repair or install a new drive shaft.
Hydraulic system is leaking air - Air bleeding is required.

Drive system overheats

Low hydraulic fluid level - Add fluid as required.
Clogged hydraulic fluid filter - Check, clean, or change as necessary.
Worn or damaged relief valve - Service or change relief valve.
Hydraulic motor or drive pump failure - Check and repair if required.
Hydraulic oil cooler is plugged - Cooling fins need to be cleaned.
Drive system is overloaded - Load needs to be reduced.

Drive system makes excessive noise

Incorrect oil viscosity - Use correct oil viscosity.
Air leaks in hydraulic system - Bleed air from hydraulic system.
Drive pump or hydraulic motor is damaged - Repair or replace faulty component.
Mechanical parts of drive system are worn or damaged - Check the parts and replace if required.

Hydraulics Troubleshooting

Hydraulic system has overheating

Incorrect hydraulic pressure setting - Correct setting is required.
Main relief valve failure or improper setting - Adjust relief valve or change if required.
Dirty hydraulic fluid - The fluid must be changed.
Lack of hydraulic fluid - Add fluid to the hydraulic system.
Hydraulic pump is faulty - Repair or replace pump if necessary.

Lift arm can't drop or lift

Faulty lift controls - Inspect and repair if necessary.
Hydraulic pump not working - Change or repair hydraulic pump if required.
Hydraulic control valve failure - Install a new hydraulic valve or repair it.
Hydraulic cylinder malfunction - Change or repair lift cylinder.
Low hydraulic oil level - Need to add oil.

Bucket does not function

Bucket tilt controls are damaged - Change or repair.
Hydraulic pump is broken - Install new pump or repair it.
Faulty hydraulic control valve - Repair or replace the valve.
Hydraulic bucket cylinder is defective - Replace or repair cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Slow boom or bucket action

Hydraulic pump is faulty - Flow-rate hydraulic pump and replace pump if necessary.
Hydraulic cylinder leaking - Cylinder seals need to be replaced.
Low hydraulic oil level - Check and refill the hydraulic oil.
Worn or unadjusted hydraulic control valve - Repair or set correctly.
Hydraulic pressure has dropped - Correct setting is required.

Jerky operation of the bucket or boom

There is air in the hydraulic system - Bleed hydraulic system.
Hydraulic oil filter element is dirty - Clean or install new filter.
Hydraulic fluid is dirty - Change hydraulic fluid.
Scratched cylinder rod or tube - Replace failed component.

Hydraulic pump is excessively noisy

Insufficient oil level or leaking hydraulic system - Add hydraulic oil or correct system leaks.
Hydraulic filter is dirty - Service or change hydraulic filter.
Dirty suction line - Service the suction line.
Air trapped in hydraulic pump - Bleed air.
Faulty pump components - Rebuild or change hydraulic pump.

Electrical Troubleshooting

Battery is not charging

Loose or corroded wire connections - Tighten or service connections.
Faulty battery terminal clamps - Terminal clamps should be changed.
Battery is defective - Replace the battery.
Defective or loose belt - Belt needs to be adjusted or replaced.

Starter cranks slow

Battery capacity is low - Battery is drained, recharge it.
Battery drains quickly - Battery needs to be serviced or replaced.
Battery terminals are corroded or wires are disconnected - Connect wiring properly or install new terminals.

Starter doesn't crank

Battery is discharged or worn - Recharge or replace battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output voltage - Battery needs to be recharged.
Starter motor is faulty - Change or repair starter.