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New Holland TL90A Troubleshooting

New Holland TL90A Engine Troubleshooting

Engine starts hard or doesn't start: Fuel filter element clogging. Clean or replace the filter. Air in the fuel pipes. Bleed the fuel pipes. Clogged or defective injection nozzles. Clean or change injection nozzles. Fuel injection pump malfunctioning. Install a new pump or rebuild.

Engine stops unexpectedly during operation: Wrong setting of fuel injection pump timing. Check the fuel injection pump timing adjustment. Fuel filter plugged. Change filter element. Engine is not fully warmed up. Warm up to required temperature.

Engine starts but stops suddenly: Fuel filter element is dirty. Clean the filter element. Fuel injection pump is broken. Rebuild or replace pump. Plugged air cleaner. Replace air filter element.

Engine overheated: Radiator core is dirty or radiator cap is damaged. Clean radiator or install new cap. Engine has a lack of coolant. Add coolant and check the components of cooling system. Fan belt slipping or worn. Replace as required. Engine oil level is low. Check oil level and add oil as required.

Lack of engine power: Fuel injection nozzles are dirty or defective. Clean or change injection nozzles. Fuel hoses or lines are dirty. Fuel hoses and lines must be clean. Air filter is dirty. Clean or change. Cylinder-head gasket is broken. Gasket should be replaced.

Engine knocking sound or abnormal noise: Low coolant temperature. Warm up engine as required. Low engine oil level. Fill up the oil to required level. Fuel injection pump timing is not adjusted. Check the fuel injection pump timing adjustment. Scored or worn pistons. Pistons need to be replaced. Connecting rod is defective or not aligned. Connecting rod needs to be aligned or changed.

Engine stops at idle: Low idle speed setting is incorrect. Correct the settings. The valve clearance is incorrect. Correct valve clearance needs to be set. Fuel injection pump malfunction. Install a new pump or rebuild.

Oil pressure is insufficient: Lack of oil. Fill the crankcase with oil. Worn oil pump. Install a new pump. Oil filter is dirty. Change or clean engine oil filter element.

New Holland TL90A Transmission Troubleshooting

Transmission noises: Defective gears or improper backlash. Adjust backlash properly or replace the gears. Worn or damaged gear shift forks. Install new shift forks. Worn or damaged shaft splines. Change defective shaft. Low fluid level. Fill the transmission housing to proper fluid level. Bearings are damaged or worn. Replace faulty bearings. Transmission oil is dirty. Transmission oil change required.

Hard shifts: Rusty or worn gear shift linkage. Shift linkage need to be replaced. Clutch is out of adjustment or defective. Clutch needs to be replaced or adjusted. Damaged or worn gear shift forks. Install new shift forks. Gearshift mechanism is damaged. Replace or repair the mechanism.

Low transmission pressure: Transmission oil level is low. Need to add transmission oil. Clogged transmission fluid filter (if equipped). Clean or change transmission fluid filter. Relief valve is damaged. Replace the valve.

Transmission fluid leaks: Damaged seals or gaskets. Change defective gaskets or seal. High transmission fluid level. Drain the excess fluid.

New Holland TL90A Hydraulic System Troubleshooting

Hydraulics overheating: Hydraulic fluid type is incorrect. Pour the correct type of fluid. Hydraulic oil is contaminated. Fill up with fresh hydraulic oil. Air in the hydraulic system. Air bleeding. Damaged main relief valve. Replace relief valve.

Hydraulic fluid pressure is low: Hydraulic oil level low. Fill the system to proper hydraulic oil level. Clogged hydraulic oil filter element. Replace hydraulic filter element or service if necessary. Leaking hydraulic lines. Find leaks in the system and fix it. Hydraulic spool valve block is not adjusted properly. The spool valve should be properly adjusted. Hydraulic pump malfunction. Install a new hydraulic oil pump. Hydraulic cylinder is defective. Repair or change hydraulic cylinder.

3-point hitch fails to lift or lifts slowly: Hydraulic pump failure. Repair or replace hydraulic oil pump. Main relief valve is defective. Replace relief valve. Damaged hydraulic control valve. Repair or change hydraulic valve. Hydraulic cylinder malfunction. Repair or install a new hydraulic cylinder. Low hydraulic oil level. Check and refill the hydraulic oil. Clogged hydraulic fluid filter element. Replace filter element or clean if required. Excessive hitch loading. Reduce the load is required.

3-point hitch cannot be lowered or lowering is too slowly: Hydraulic cylinder is defective. Repair or replace hydraulic cylinder. Incorrect setting hydraulic control valve block. Set correctly. Damaged hitch cross shaft. Install a new shaft. The three-point hitch is not adjusted. The 3-point hitch must be adjusted.

3-point hitch jerks when lower or lift: Contaminated hydraulic oil. Change hydraulic oil. Defective hydraulic pump. Repair or replace hydraulic fluid pump. Air in the hydraulic system. Air bleeding. Defective hydraulic spool valve block. Replace or repair the valve. Hydraulic cylinder is faulty. Repair or change hydraulic cylinder.

New Holland TL90A Steering System Troubleshooting

Excessive steering wheel play: Steering column coupling or shaft is extremely worn out. Replace defective part. Steering pump stopped working. Steering pump needs to be replaced or repaired. Loose or worn steering linkage components. Inspect and change as required. Steering control unit is damaged or worn. Check and replace as required.

Steering wheel turns hard: Air in the hydraulic steering system. Air-bleed steering system. Steering filter is clogged. Change steering filter element. Steering oil insufficient. Check and refill steering oil. Steering control unit has malfunction or wear. Check and replace as required. Steering pump is worn. Check the steering pump and replace if necessary. Pump flow control valve is stuck or worn. Clean or install new control valve. Worn or incorrectly fitted steering column. Replace the steering column or refit it correctly. Front tyres are worn unevenly. Install new tyres. Incorrect toe-in. Adjust toe-in properly. Steering cylinder leaks. Change worn piston rod or damaged cylinder seals.

Front wheels wander to left or right: Steering control unit is defective or worn. Repair or replace the steering control unit. Defective steering cylinder. Repair or change hydraulic steering cylinder. Incorrect toe-in. Adjust toe-in wheels. Worn or loose steering linkage joints. Check and change as required. Front wheel bearings are worn or incorrectly adjusted. Change or adjust bearings correctly. Front tyres are worn unevenly. Install new tyres.

New Holland TL90A Electrical System Troubleshooting

Battery is not charging: Loose or corroded wire connections. Service or tighten cable connections. Defective battery terminal connectors. Install new terminal connectors. Defective battery. Battery change required. Belt is worn or loose. Install a new belt or adjust belt tension.

Starter turns slowly: Low battery voltage. Charge the battery. Battery will not hold charge. Service or change the battery. Battery cables are disconnected or terminals are faulty. Connect wiring correctly or install new terminals.

Starter motor is not working: Battery is discharged or defective. Charge or change the battery. Disconnected or improperly connected wiring harness. Inspect battery wiring harness and connect as required. Battery voltage is low. Recharge the battery. Faulty starter motor. Repair or install a new starter.