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Kubota MX4700 Troubleshooting

Kubota MX4700 Engine Troubleshooting

Engine hard to start or won't start: Dirty fuel filter. Clean the filter or install new filter element. Air in fuel tank. Bleed fuel tank. Fuel injection nozzles are faulty or clogged. Clean or change injection nozzles. Fuel injection pump malfunction. Install a new pump or rebuild.

Engine stops running suddenly: Improper fuel injection timing. Adjust fuel injection pump as required. Fuel filter plugged. Change filter element. Engine is not preheated. Normalize the temperature by warming up the engine.

Engine starts but stalls suddenly: Fuel filter plugging. Service or replace the filter. Fuel injection pump is not operating properly. Repair or install new pump. Plugged air cleaner. Clean or replace the element.

Engine is overheated: Defective radiator cap or clogged radiator core. Install new cap or clean radiator. Insufficient coolant fluid. Add coolant fluid and inspect the cooling system for leaks. Fan belt is loose or defective. Change the fan belt. Engine oil level low. Fill up the engine oil.

Engine power loss: Fuel injection nozzles are faulty or clogged. Change fuel injection nozzles. Dirt in the fuel hoses or lines. Service fuel hoses and lines. Plugged air cleaner. Clean or replace the element. Cylinder-head gasket is broken. Change cylinder head gasket.

Engine knocks or noises: Engine has not warmed up to the recommended temperature. Warm up to required temperature. Not enough engine oil. Add oil to the engine crankcase. Fuel injection pump timing is wrong. Check the fuel injection pump timing adjustment. Pistons are scored or worn. Have pistons replaced. Connecting rod is worn or not aligned. Connecting rod must be aligned or replaced.

Engine shuts off while idling: Low idle speed set incorrectly. Adjustment required. Valve out of adjustment. Check and adjust as required. Fuel injection pump failure. Repair or install a new fuel pump.

Oil pressure too low: Low oil level. Check and refill the oil. Oil pump malfunction. Install a new pump. Dirty oil filter element. Service or replace engine oil filter.

Kubota MX4700 Transmission Troubleshooting

Transmission makes noise: Incorrect backlash or gears are worn. Change worn gears or adjust backlash correctly. Damaged or worn gear shift forks. Change the shift forks. Shaft splines are damaged or worn. Shaft need to be replaced. Transmission fluid insufficient. Add fluid to the transmission housing. Worn or broken bearings. Change faulty bearings. Transmission fluid is dirty. Change the fluid.

Hard shifts: Stuck or worn gear shift linkage. Install a new gear shift linkage. Clutch is faulty or misadjusted. Adjust or change the clutch. Shift forks are worn or bent. Replace defective shift forks. Worn gear shifting mechanism. Repair or change worn components if necessary.

Transmission oil pressure is insufficient: Transmission fluid insufficient. Check and refill the transmission fluid. Transmission oil filter element clogging (if equipped). Clean or replace the transmission filter. Relief valve failure. Install a new relief valve.

Transmission oil leaks: Damaged gaskets or seals. Change defective seal or gaskets. Too much fluid in transmission. Excess fluid must be drained.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission makes noise: Speed control pedal linkage is damaged or out of adjustment. Adjust or change linkage. Transmission overload. The load should be reduced. Transmission fluid is dirty or fluid level is too low. Fill to required level or change the fluid. Defective relief valve. Change relief valve. Damaged or worn components of hydrostatic transmission. Change or repair defective parts.

Hot transmission oil: Transmission is under excessive load. Reduce loading. Clogged or damaged cooling components. Check all cooling components and change or repair if required. Transmission oil level is low. Check and refill the transmission oil. Transmission oil filter is dirty. Clean or change transmission oil filter.

Lack of power: Insufficient transmission fluid. Check and refill the transmission fluid. Stuck relief valve. Replace relief valve. Speed control linkage is worn or unadjusted. Adjust or replace linkage.

Transmission oil leaks: Oil drain line is clogged. Clean or change the line. Damaged gaskets or seals. Replace worn gaskets or seal. Internal transmission housing pressure is too high. Change defective parts.

Kubota MX4700 Hydraulics Troubleshooting

Hydraulic system is too hot: Hydraulic oil type is incorrect. Pour the correct type of oil. Hydraulic fluid is contaminated. Fill up with new hydraulic fluid. Air in the hydraulic system. Air bleeding. Faulty main relief valve. Relief valve need to be replaced.

Hydraulic fluid pressure is low: Hydraulic fluid level low. Fill the system to proper hydraulic fluid level. Hydraulic oil filter is clogged. Hydraulic filter maintenance required. Leaks in hydraulic lines. Check the hydraulic system and fix leaks. Hydraulic control valve is set improperly. The control valve must be set correctly. Hydraulic pump not working. Replace or repair hydraulic oil pump. Hydraulic cylinder is defective. Install a new hydraulic cylinder or repair it.

Hitch won't raise or raises slowly: Hydraulic pump malfunction. Replace or repair hydraulic oil pump. Damaged main relief valve. Change relief valve. Hydraulic control valve is faulty. Change or repair hydraulic valve. Hydraulic cylinder failure. Repair or install a new hydraulic cylinder. Insufficient hydraulic oil. Fill the system to proper hydraulic oil level. Dirty hydraulic fluid filter element. Clean the hydraulic filter element or replace if necessary. Excessive load on hitch. Reduce hitch load.

Hitch cannot be lowered or lowering is too slowly: Broken hydraulic cylinder. Repair or replace hydraulic cylinder. Incorrect adjusted hydraulic control valve. Adjust correctly. Worn hitch cross shaft. Change the shaft. 3-point hitch is out of adjustment. The hitch must be adjusted.

Hitch jerks when drop or lift: Hydraulic fluid contamination. Change hydraulic fluid. Hydraulic pump is defective. Change or repair hydraulic oil pump. Air in the hydraulic system. Air bleeding. Faulty hydraulic spool valve. Replace or repair the valve. Hydraulic cylinder is defective. Change or repair hydraulic cylinder.

Kubota MX4700 Steering System Troubleshooting

Steering wheel has too much free-play: Steering column shaft or coupling has maximum wear. Replace defective part. Steering pump is faulty. Steering pump needs to be repaired or replaced. Steering linkage assembly is worn or loose. Check and replace as required. Hydrostatic steering unit has malfunction or wear. Check and replace as required.

Steering wheel is very heavy to turn: Air lock in hydraulic steering system. Bleed air. Clogged steering filter. Clean or replace filter element. Insufficient steering oil. Need to add steering oil. Hydrostatic steering unit is damaged or worn. Replace or repair steering unit as required. Steering pump stopped working. Steering pump needs to be repaired or replaced. Pump flow control valve is damaged or stuck. Flush or change flow control valve. Improperly assembled or defective steering column. Reassemble or change the steering column. Front tyres wear unevenly. Change the tyres. Incorrect toe-in. Adjust toe-in wheels. Steering cylinder leaks. Change damaged piston rod or worn seal sleeves.

Tractor pulls to left or right: Hydrostatic steering unit has malfunction or wear. Replace or repair steering unit as required. Steering cylinder malfunction. Change or repair hydraulic steering cylinder. Improper toe-in. Check toe-in and correct. Loose or worn steering linkage components. Replace or repair steering linkage. Improperly adjusted or defective front wheel bearings. Adjust properly or replace bearings. Tire pressure uneven. Inflate the tires correctly.

Kubota MX4700 Electrical Troubleshooting

Battery won’t charge: Loose or corroded cable connections. Tighten or service connections. Electrical terminal connectors are faulty. Replace terminal connectors. Battery dead cell. Install a new battery. Loose or worn belt. Change belt or adjust belt tension.

Starter cranks slowly: Low battery voltage. Battery needs to be recharged. Battery is draining quickly. Battery needs to be serviced or replaced. Battery terminals are corroded or wires are disconnected. Check cable connections and replace or service terminals.

Starter will not work: Battery is drained or worn. Need to charge or replace the battery. Wire harness is disconnected or incorrectly connected. Check wire harness and connect as required. Low battery capacity. Low battery charging, charge as required. Starter motor failure. Repair or replace starter.