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New Holland 7635 Troubleshooting

New Holland 7635 Diesel Engine Troubleshooting

Engine starts hard or doesn't start: Fuel filter plugged. Change filter element. Air in the fuel pipes. Bleed the fuel pipes. Clogged or defective injection nozzles. Inspect nozzles and replace if necessary. Faulty fuel injection pump. Rebuild or change fuel pump.

Engine stalls after running: Timing of fuel injection pump is incorrect. Adjust fuel injection pump as required. Fuel filter plugging. Change the filter element. Engine is not preheated. Warm up engine as required.

Engine starts and then shuts off: Fuel filter element is clogged. Filter maintenance required. Fuel injection pump is damaged. Rebuild or change fuel pump. Air filter is clogged. Change air filter element.

Engine overheating: Dirty radiator core or defective radiator cap. Change cap or clean radiator. Lack of engine coolant. The cooling system needs to be refilled and checked for faults. Fan belt is broken or worn. Belt replacement is recommended. Low engine oil level. Fill up the engine oil.

Loss of engine power: Fuel injection nozzles fault. Inspect nozzles and replace if necessary. Dirt in the fuel hoses or lines. Clean fuel system lines and hoses. Clogged air cleaner. Service air cleaner. Cylinder head gasket is defective. Cylinder-head gasket replacement required.

Abnormal engine knocking or noise: Engine is not warmed up to the required temperature. Warm up to required temperature. Lack of engine oil. Checking oil level and add if necessary. Timing of fuel injection pump is incorrect. Adjust the pump as required. Worn or broken pistons. Have pistons replaced. Connecting rod is misaligned or worn. Need to align or replace the connecting rod.

Engine stalls while idle: Low idle speed adjustment is incorrect. Test and adjust. Incorrect valve clearance. Check and adjust as required. Defective fuel injection pump. Replacement or repair required.

Oil pressure is insufficient: Not enough oil in the engine. Check oil level and add oil as required. Oil pump is worn or damaged. Install a new pump. Oil filter element clogged. Change or clean engine oil filter element.

New Holland 7635 Transmission Troubleshooting

Transmission is excessively noisy: Damaged gears or incorrect backlash. Change worn gears or adjust backlash correctly. Shift forks are bent or worn out. Replace the shift forks. Worn or damaged shaft splines. Change defective shaft. Transmission fluid insufficient. Fill the transmission housing to proper fluid level. Bearings are cracked or worn. Faulty bearings should be replaced. Transmission fluid is dirty. Fill up with fresh transmission fluid.

Gear shift is hard: Stuck or worn gear shift linkage. Lubricate or replace shift linkage. Unadjusted or worn clutch. Adjust clutch or change if necessary. Shift forks are worn or bent. Change the shift forks. Defective parts in the gearshift mechanism. Replace defective parts.

Transmission oil pressure is low: Insufficient transmission oil. Add oil to the transmission housing. Transmission oil filter is dirty (if equipped). Service or replace the transmission oil filter. Relief valve is stuck. Change the valve.

Transmission oil leaking: Damaged seals or gaskets. Change defective seal or gaskets. High transmission oil level. Correct the oil level.

New Holland 7635 Hydraulics Troubleshooting

Hydraulic system overheating: Hydraulic fluid type is incorrect. Pour the correct type of fluid. Contaminated hydraulic fluid. Change hydraulic fluid. Air in hydraulic system. Bleed air from hydraulic system. Main relief valve is faulty. Relief valve replacement required.

Low hydraulic oil pressure: Insufficient hydraulic oil. Checking hydraulic oil level and add if necessary. Dirty hydraulic fluid filter. Clean or replace the hydraulic filter. Leaking hydraulic pipes. Check the hydraulic system and fix leaks. Incorrect adjusted hydraulic control valve. Adjust correctly. Hydraulic pump not working. Replace or repair hydraulic fluid pump. Hydraulic cylinder is faulty. Install a new hydraulic cylinder or repair it.

3-point hitch won't lift or lifts slowly: Defective hydraulic pump. Install a new hydraulic oil pump. Main relief valve is faulty. Change relief valve. Faulty hydraulic control valve. Install a new hydraulic valve or repair it. Broken hydraulic cylinder. Install a new hydraulic cylinder or repair it. Insufficient hydraulic fluid. Fill the system to proper hydraulic fluid level. Dirty hydraulic fluid filter element. Service the hydraulic filter or change if required. Heavy load on the hitch. Reduce the load is required.

Hitch won't drop or drops slowly: Hydraulic cylinder is broken. Repair or install a new hydraulic cylinder. Hydraulic spool valve is not set properly. Set the spool valve properly. Damaged hitch cross shaft. Install a new shaft. The 3-point hitch is not adjusted. The hitch must be adjusted.

Hitch lift or lower is jerky: Hydraulic oil is dirty. Hydraulic oil change required. Hydraulic pump is faulty. Repair or replace hydraulic oil pump. Air in hydraulic system. Bleed air from hydraulic system. Hydraulic spool valve is damaged. Install a new hydraulic valve or repair it. Hydraulic cylinder not working. Repair or install a new hydraulic cylinder.

New Holland 7635 Steering Troubleshooting

Excessive play in steering: Steering column coupling or shaft is extremely worn out. Change faulty part. Steering pump is faulty. Steering pump needs to be repaired or replaced. Loose or worn steering linkage components. Inspect and change as required. Power steering control valve is damaged or worn. Inspect and change as required.

Steering is stiff: Air lock in hydraulic steering system. Bleed air from system. Dirty steering filter. Clean steering filter element. Insufficient steering oil. Need to add steering oil. Power steering control valve has wear or malfunction. Change or repair control valve if required. Hydraulic steering pump is defective. Steering pump needs to be repaired or replaced. Steering pump control valve is stuck or faulty. Clean or replace control valve. Incorrectly assembled or damaged steering column. Reassemble the steering column correctly or change it. Uneven tire pressure. Inflate the tires properly. Incorrect toe-in. Check and adjust toe-in. Steering cylinder leaks. Replace worn seal sleeves or damaged piston rod.

Front wheels wander to left or right: Power steering control valve is worn or defective. Change or repair steering control valve if required. Defective steering cylinder. Repair or replace steering cylinder. Improper toe-in. Check and adjust toe-in. Steering linkage assembly is worn or loose. Repair or replace steering linkage. Improperly adjusted or worn front wheel bearings. Adjust properly or change bearings. Uneven tire pressure. Inflate the tires properly.

New Holland 7635 Electrical System Troubleshooting

Battery won’t charge: Electrical wire connections are corroded or loose. Service or tighten cable connections. Battery terminal clamps are faulty. Replace terminal clamps. Dead cell in battery. Use a new battery. Belt is worn or loose. Adjust belt tension or change the belt.

Starter turning slow: Low battery power. Recharge the battery. Battery won’t hold charge. Service battery or change it. Wires are disconnected or battery terminals are corroded. Check cable connections and replace or service terminals.

Starter will not work: Battery is low or faulty. Need to charge or replace the battery. Disconnected or improperly connected wiring harness. Inspect battery wiring harness and connect as required. Low battery capacity. Recharge the battery. Defective starter motor. Starter should be replaced.