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Kubota M4072 Troubleshooting

Kubota M4072 Diesel Engine Troubleshooting

Engine starts hard or won't start: Fuel filter plugging. Replace filter element. Air trapped in fuel system. Bleed air. Fuel injection nozzles fault. Clean or change injection nozzles. Fuel injection pump damage. Rebuild or change fuel pump.

Engine stops suddenly during operation: Improper fuel injection timing. Set up as recommended. Fuel filter element is clogged. Change filter element. Engine has not warmed up to the recommended temperature. Warm up engine as required.

Diesel starts and stops: Clogged fuel filter. Clean the filter or install new filter element. Fuel injection pump malfunction. Rebuild or replace pump. Intake air restriction. Carry out maintenance on air filter.

Engine overheated: Dirty radiator core or defective radiator cap. Install new cap or clean radiator. Lack of engine coolant. Add coolant fluid and inspect the cooling system for leaks. Fan belt is worn or faulty. Change the fan belt. Not enough engine oil. Check and refill engine oil.

Engine lacks power: Fuel injection nozzles are damaged. Test injection nozzles and change if necessary. Restricted fuel lines or hoses. Clean fuel system hoses and lines. Dirty air filter. Clean or replace the element. Blown cylinder head gasket. Install a new gasket.

Engine noises or knocks: Engine is not warmed up to the required temperature. Warm up to required temperature. Engine oil insufficient. Check and refill engine oil. Incorrect adjustment of fuel injection pump timing. Adjust as recommended. Broken or worn pistons. Have pistons replaced. Faulty or misaligned connecting rod. Alignment procedure or replacement is required.

Engine stops when idling: Improperly adjusted low idle speed. Adjustment required. Improper valve clearance. Adjust valve clearance. Fuel injection pump damage. Replace or repair injection pump.

Oil pressure too low: Oil level is low. Fill the crankcase with oil. Oil pump failure. Repair or change. Oil filter clogging. Replace or service engine oil filter.

Kubota M4072 Transmission Troubleshooting

Transmission noise: Backlash is incorrect or gears are damaged. Adjust backlash correctly or replace the gears. Shift forks are worn or bent. Replace defective shift forks. Shaft splines are damaged or worn. Replace defective shaft. Insufficient transmission fluid. Check and refill the transmission fluid. Bearings are damaged or worn. Replace the bearings. Transmission fluid is dirty. Transmission fluid change required.

Difficult to shift gears: Stuck or worn gear shift linkage. Lubricate or replace the shift linkage. Unadjusted or worn clutch. Adjust clutch or change if necessary. Damaged or worn gear shift forks. Change the shift forks. Worn parts of the gear shifting mechanism. Change worn parts.

Low transmission fluid pressure: Transmission fluid level is low. Need to add transmission fluid. Transmission oil filter is clogged (if fitted). Clean or replace the transmission filter. Defective relief valve. Install a new valve.

Transmission oil leaking: Seals or gaskets are broken. Gaskets or seal need to be replaced. Transmission fluid level is high. Correct the fluid level.

Kubota M4072 Hydraulic System Troubleshooting

Hydraulic system overheated: Hydraulic fluid type is improper. The proper type of fluid must be used. Hydraulic oil is dirty. Hydraulic oil change required. Air in hydraulic pipes. Bleed hydraulic pipes. Main relief valve failure. Relief valve replacement required.

Hydraulic oil pressure is insufficient: Hydraulic fluid is insufficient. Checking hydraulic fluid level and add if necessary. Hydraulic fluid filter element is clogged. Replace filter element or clean if required. Leaks in hydraulic pipes. Check the hydraulic system and fix leaks. Hydraulic control valve is not set properly. Adjust properly. Hydraulic pump is faulty. Install a new hydraulic fluid pump. Hydraulic cylinder not working. Repair or replace hydraulic cylinder.

3-point hitch can't lift or lifts too slowly: Hydraulic pump failure. Repair or replace hydraulic fluid pump. Main relief valve is faulty. Change relief valve. Defective hydraulic control valve block. Install a new valve or repair it. Hydraulic cylinder is broken. Change or repair hydraulic cylinder. Hydraulic fluid is insufficient. Fill up the hydraulic fluid. Dirty hydraulic fluid filter. Replace filter element or clean if required. Excessive loading on the hitch. Reduce loading.

3-point hitch can't drop or drops too slowly: Hydraulic cylinder is faulty. Repair or replace hydraulic cylinder. Incorrect setting hydraulic spool valve. Use the correct setting. Worn lift arm shaft. Install a new shaft. The hitch has not been adjusted. Adjust three-point hitch as required.

Hitch lower or lift is jerky: Dirty hydraulic fluid. The fluid must be changed. Faulty hydraulic pump. Change or repair hydraulic fluid pump. There is air in the hydraulic system. Bleed hydraulic system. Defective hydraulic control valve. Change or repair hydraulic valve. Hydraulic cylinder is faulty. Repair or install a new hydraulic cylinder.

Kubota M4072 Steering Troubleshooting

Excessive steering wheel free play: Worn steering column shaft or coupling. Replace defective component. Hydraulic steering pump is defective. Check the steering pump and replace if necessary. Steering linkage components are loose or worn. Change or repair steering linkage. Power steering control valve has damage or wear. Repair or change the steering control valve.

Steering wheel is very heavy to turn: Air trapped inside steering system. Air-bleed steering system. Dirty steering filter element. Clean or change steering filter. Steering fluid level is low. Check fluid level and add steering fluid as required. Power steering control valve has damage or wear. Inspect and change as required. Faulty steering pump. Install a new hydraulic steering pump. Stuck or worn pump flow control valve. Replace or service control valve. Incorrectly fitted or worn steering column. Refit or replace the steering column. Tire pressure is uneven. Adjust the tire pressure. Improper toe-in. Check toe-in and correct. Leaking steering cylinder. Damaged cylinder seals or worn piston rod.

Tractor pulls to right or left: Defective or worn power steering control valve. Repair or replace the steering control valve. Defective steering cylinder. Change or repair steering cylinder. Not adjusted toe-in. Adjust toe-in properly. Steering linkage joints are worn or loose. Check and replace as required. Front wheel bearings are damaged or incorrectly adjusted. Replace or adjust the bearings correctly. Uneven wear on front tyres. Replace the tyres.

Kubota M4072 Electrical Troubleshooting

Battery will not charge: Loose or corroded cable connections. Clean or tighten connections. Battery terminal connectors are defective. Replace terminal connectors. Bad cell in battery. Use a new battery. Belt is defective or loose. Replace belt or adjust belt tension.

Starter cranks slow: Battery power is low. Low battery charging, charge as required. Battery is not holding charge. Service battery or replace it. Disconnected battery cables or bad terminals. Connect wiring properly or install new terminals.

Starter does not work: Battery is low or faulty. Replace or charge as required. Wiring is incorrectly connected or disconnected. Inspect wiring and connect correctly. Low battery voltage. Battery needs to be recharged. Starter motor is faulty. Repair or install a new starter.