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Kubota M4-071 Troubleshooting

Kubota M4-071 Engine Troubleshooting

Engine starts hard or will not start: Fuel filter plugging. Change filter element. Air in the fuel lines. Bleed the fuel lines. Fuel injection nozzles fault. Replace injection nozzles. Fuel injection pump malfunction. Repair or replace injection pump.

Engine stops suddenly during operation: Fuel injection pump timing is wrong. Adjust according to specifications. Fuel filter plugging. Replace the filter element. Engine not warmed up. Normalize the temperature by warming up the engine.

Engine starts but then stops: Clogged fuel filter. Clean or change the filter. Fuel injection pump damage. Replacement or repair required. Dirty air filter. Clean or replace the element.

Engine overheats: Radiator core is clogged or radiator cap is leaking. Clean radiator or change cap. Engine coolant is insufficient. Add coolant and check the components of cooling system. Fan belt is loose or defective. Change as required. Engine oil insufficient. Fill the crankcase with engine oil.

Engine power is reduced: Clogged or burnt injection nozzle. Check and replace nozzles if required. Fuel lines or hoses clogging. Clean fuel hoses and lines. Air filter is dirty. Service air cleaner. Worn cylinder head gasket. Replace the gasket as required.

Engine knocks or noises: Engine is not fully warmed up. Normalize the temperature by warming up the engine. Not enough engine oil. Check oil level and add oil as required. Improper fuel injection timing. Set up as recommended. Worn or broken pistons. Pistons replacement required. Misaligned or defective connecting rod. Align or change connecting rod.

Engine stops when idling: Wrong adjustment of low idle speed. Test and adjust. Valve clearance is not correct. Adjustment procedure required. Fuel injection pump is damaged. Install a new pump or rebuild.

Oil pressure is low: Low oil level. Fill crankcase to proper oil level. Oil pump is worn or damaged. Replace as required. Oil filter clogging. Replace or service engine oil filter.

Kubota M4-071 Transmission Troubleshooting

Transmission noise: Worn gears or incorrect backlash. Replace gears or adjust backlash correctly. Worn or damaged gear shift forks. Shift forks need to be changed. Shaft splines are stuck or worn out. Change defective shaft. Transmission oil level is low. Fill the transmission housing to proper oil level. Bearings are cracked or worn. Bearings replacement required. Transmission oil contamination. Change the oil.

Difficulty shifting gears: Stuck or worn gear shift linkage. Lubricate or replace shift linkage. Worn or unadjusted clutch. Adjust or replace the clutch. Worn or damaged gear shift forks. Change the shift forks. Worn out parts of the gearshift mechanism. Replace worn parts.

Lack of transmission oil pressure: Low oil level. Check and refill the transmission oil. Dirty transmission fluid filter element (if equipped). Service or replace the transmission fluid filter. Defective relief valve. Change relief valve.

Transmission oil leaks: Damaged seals or gaskets. Replace worn seal or gaskets. Too much oil in transmission. Drain the excess oil.

Kubota M4-071 Hydraulic System Troubleshooting

Hydraulic system overheats: Hydraulic fluid type is wrong. Use correct type of hydraulic fluid. Dirty hydraulic oil. The oil must be changed. Air in hydraulic system. Bleed air from hydraulic system. Defective main relief valve. Replace relief valve.

Low hydraulic oil pressure: Insufficient hydraulic fluid. Fill up the hydraulic fluid. Hydraulic fluid filter element is clogged. Clean or replace the hydraulic filter. Hydraulic piping is leaking. Check the system and repair leaks. Not adjusted hydraulic control valve. Need to adjust. Hydraulic pump malfunction. Change or repair hydraulic fluid pump. Hydraulic cylinder failure. Replace or repair hydraulic cylinder.

Hitch won't raise or raises slowly: Defective hydraulic pump. Replace or repair hydraulic oil pump. Main relief valve malfunction. Relief valve need to be replaced. Hydraulic spool valve block is defective. Install a new hydraulic valve or repair it. Hydraulic cylinder is defective. Change or repair hydraulic cylinder. Hydraulic fluid is insufficient. Add fluid as required. Clogged hydraulic oil filter element. Clean the hydraulic filter element or replace if necessary. Excessive hitch loading. Reduce loading.

Hitch won't drop or drops slowly: Hydraulic cylinder failure. Install a new hydraulic cylinder or repair it. Incorrect adjusted hydraulic control valve. Adjust correctly. Hitch cross shaft is worn. Change the shaft. Hitch is out of adjustment. The three-point hitch must be adjusted.

3-point hitch jerks when lower or lift: Dirty hydraulic oil. The oil must be changed. Hydraulic pump not working. Change or repair hydraulic fluid pump. Air in hydraulic lines. Bleed hydraulic lines. Hydraulic control valve block is defective. Repair or replace hydraulic valve. Hydraulic cylinder malfunction. Repair or replace hydraulic cylinder.

Kubota M4-071 Steering Troubleshooting

Steering wheel has too much free-play: Steering column coupling or shaft is worn. Change defective part. Steering pump not working. Steering pump needs to be repaired or replaced. Worn or loose steering linkage joints. Repair or change steering linkage. Power steering control valve has damage or wear. Replace or repair steering control valve as required.

Steering is difficult: Air in steering system. Bleed the system of air. Steering filter element is clogged. Steering filter maintenance required. Steering fluid level is low. Check fluid level and add steering fluid as required. Faulty or worn power steering control valve. Inspect and change as required. Steering pump is worn. Check the hydraulic steering pump and change if necessary. Pump flow control valve is stuck or worn. Service or change control valve. Improperly fitted or damaged steering column. Refit or change the steering column. Front tyres wear unevenly. Change the tyres. Incorrect toe-in. Check toe-in and correct. Steering cylinder is leaking. Change damaged piston rod or worn seal sleeves.

Tractor pulls to right or left: Power steering control valve has malfunction or wear. Inspect and change as required. Steering cylinder is damaged. Repair or replace hydraulic steering cylinder. Improper toe-in. Check toe-in and correct. Steering linkage components are loose or worn. Replace or repair steering linkage. Defective or improperly adjusted front wheel bearings. Replace or adjust the bearings correctly. Uneven wear on front tyres. Replace the tyres.

Kubota M4-071 Electrical Troubleshooting

Battery will not charge: Electrical cable connections are loose or corroded. Service or tighten connections. Electrical terminal connectors are defective. Change terminal connectors. Battery is worn. Change the battery. Loose or defective belt. Adjust belt tension or change the belt.

Starter turning slow: Low battery power. Recharge the battery. Battery will not hold charge. Service or replace the battery. Battery terminals are corroded or wires are disconnected. Check cables and service or change terminals.

Starter motor is not working: Battery is low or faulty. Replace or charge as required. Battery wiring is disconnected or improperly connected. Inspect wiring and connect as required. Battery power is low. Recharge the battery. Starter motor failing. Replace or repair starter.