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New Holland Powerstar 120 Troubleshooting

Powerstar 120 Diesel Engine Troubleshooting

Diesel engine hard to start or doesn't start: Fuel filter plugging. Install new filter element. Air in the fuel pipes. Bleed the fuel pipes. Fuel injection nozzles are damaged. Test injection nozzles and change if necessary. Faulty fuel injection pump. Replacement or repair required.

Engine stops unexpectedly during operation: Fuel injection pump timing is not adjusted. Set it up as required. Fuel filter plugging. Filter maintenance required. Coolant temperature is low. Warm up the engine.

Engine stalls after starting: Clogged fuel filter. Clean or change the filter. Fuel injection pump failure. Replace injection pump or repair it. Dirty air filter element. Carry out maintenance on air filter.

Engine is overheated: Dirty radiator core or faulty radiator cap. Clean radiator or replace cap. Insufficient coolant. Add coolant fluid to cooling system and also check it for leaks. Fan belt is loose or defective. Belt change is required. Engine oil level low. Fill the crankcase with engine oil.

Low engine power: Fuel injection nozzles are damaged. Replace injection nozzles. Restricted fuel lines or hoses. Clean fuel system hoses and lines. Plugged air cleaner. Service air cleaner. Blown cylinder head gasket. Install new cylinder head gasket.

Abnormal engine knocking or noise: Engine is not preheated. Warm up to required temperature. Engine oil insufficient. Fill the crankcase with engine oil. Fuel injection pump timing is not adjusted. Set the fuel pump timing correctly. Pistons are scored or worn. Replace the pistons as required. Connecting rod is defective or not aligned. Connecting rod needs to be aligned or changed.

Engine stalls at idle: Low idle speed adjustment is incorrect. Adjust low idle speed. Valve clearance is wrong. Adjust valve clearance. Fuel injection pump malfunction. Replace or rebuild injection pump.

Low oil pressure: Low crankcase oil level. Add oil to the engine crankcase. Oil pump is worn or damaged. Repair or change. Oil filter clogged. Replace or clean engine oil filter element.

Powerstar 120 Transmission Troubleshooting

Transmission makes excessive noise: Incorrect backlash or gears are worn. Change the gears or set backlash properly. Worn or bent shift forks. Change the shift forks. Stuck or worn shaft splines. Replace the shaft. Insufficient transmission fluid. Add fluid to the transmission housing. Bearings are cracked or worn. Replace faulty bearings. Transmission oil contamination. Fill up with fresh transmission oil.

Hard shifts: Corroded or worn gear shift linkage. Change or lubricate shift linkage. Clutch is faulty or misadjusted. Change or adjust clutch. Worn or bent shift forks. Replace the shift forks. Worn out parts of the gearshift mechanism. Replace worn parts.

Low transmission pressure: Lack of transmission fluid. Need to add transmission fluid. Plugged transmission oil filter (if equipped). Clean or change transmission oil filter. Relief valve is damaged. Change the valve.

Transmission fluid leakage: Damaged gaskets or seals. Install new components. High transmission fluid level. Drain the excess fluid.

Powerstar 120 Hydraulics Troubleshooting

Hydraulic system is overheated: Incorrect hydraulic fluid type. Fill up with the proper type of fluid. Dirty hydraulic oil. The oil must be changed. Air in hydraulic lines. Bleed hydraulic lines. Damaged main relief valve. Change relief valve.

Hydraulic fluid pressure too low: Hydraulic fluid is insufficient. Fill the system to proper hydraulic fluid level. Dirty hydraulic fluid filter. Change hydraulic filter element or clean if necessary. Leaks in hydraulic pipes. Inspect hydraulic system for leaks and repair it. Hydraulic control valve block is not set properly. Use the proper setting. Hydraulic pump failure. Replace or repair hydraulic fluid pump. Faulty hydraulic cylinder. Install a new hydraulic cylinder or repair it.

Hitch not raising or hitch raises slowly: Hydraulic pump malfunction. Replace or repair hydraulic fluid pump. Main relief valve is damaged. Relief valve replacement required. Hydraulic control valve block is faulty. Change or repair hydraulic valve. Hydraulic cylinder is broken. Change or repair hydraulic cylinder. Low hydraulic fluid level. Fill the system to proper hydraulic fluid level. Clogged hydraulic oil filter element. Clean or change hydraulic filter. Excessive hitch loading. Reduce hitch load.

Hitch cannot be dropped or dropping is too slow: Damaged hydraulic cylinder. Install a new hydraulic cylinder or repair it. Incorrect adjusted hydraulic spool valve. Adjust the spool valve correctly. Worn hitch cross shaft. Install a new shaft. Three-point hitch has not been adjusted. The 3-point hitch must be adjusted.

3-point hitch jerks when lower or lift: Hydraulic fluid is dirty. Hydraulic fluid change required. Defective hydraulic pump. Change or repair hydraulic oil pump. There is air in the hydraulic system. Bleed hydraulic system. Hydraulic control valve block is faulty. Repair or replace the valve. Broken hydraulic cylinder. Change or repair hydraulic cylinder.

Powerstar 120 Steering System Troubleshooting

Excessive free play of steering wheel: Steering column coupling or shaft has maximum wear. Replace defective part. Defective hydraulic steering pump. Repair or change steering pump. Worn or loose steering linkage assembly. Check and replace as required. Power steering control valve has damage or wear. Repair or replace control valve.

Steering wheel is very heavy to turn: Air in steering system. Air-bleed steering system. Steering filter element is clogged. Service or replace the steering filter. Low steering oil level. Fill up the steering oil. Power steering control valve has damage or wear. Check and replace as required. Hydraulic steering pump is defective. Repair or replace steering pump. Pump flow control valve is stuck or damaged. Install a new flow control valve or clean it. Improperly installed or damaged steering column. Install the steering column as required or replace it. Tire pressure uneven. Inflate the tires correctly. Incorrect toe-in. Check toe-in and correct. Steering cylinder leakage. Replace scratched piston rod or worn cylinder seals.

Front wheels wander to right or left: Faulty or worn power steering control valve. Repair or change the steering control valve. Faulty steering cylinder. Replace or repair steering cylinder. Incorrect toe-in. Check toe-in and correct. Steering linkage parts are loose or worn. Inspect and replace as required. Incorrectly adjusted or worn front wheel bearings. Install new bearings or adjust it correctly. Front tires wear unevenly. Change the tires.

Powerstar 120 Electrical System Troubleshooting

Battery won’t charge: Corroded or loose wire connections. Clean or tighten connections. Battery terminal clamps are defective. Change terminal clamps. Battery is worn. Replace the battery. Belt is damaged or loose. Adjust belt tension or install a new belt.

Starter motor turns slow: Low battery output voltage. Battery is drained, charge it. Battery is draining quickly. Battery needs to be serviced or replaced. Bad battery terminals or disconnected wiring. Check wiring and clean or replace terminals.

Starter is not cranking: Battery is drained or worn. Charge or change the battery. Wiring harness is disconnected or improperly connected. Check wiring harness and connect as required. Low battery output voltage. Battery is drained, charge it. Defective starter motor. Starter needs to be changed.