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Kubota M128X Troubleshooting

Kubota M128X Engine Troubleshooting

Diesel engine hard to start or doesn't start: Dirty fuel filter. Filter maintenance required. Air trapped in fuel system. Bleed air. Fuel injection nozzles fault. Clean or change injection nozzles. Damaged fuel injection pump. Change pump or rebuild it.

Engine shuts off while running: Wrong setting of fuel injection pump timing. Adjust fuel injection pump as required. Fuel filter plugged. Clean the filter element. Low coolant temperature. Warm up the engine.

Engine starts but stops suddenly: Fuel filter plugging. Service or replace the filter. Fuel injection pump failure. Rebuild or replace pump. Clogged air filter element. Air filter maintenance required.

Engine overheats: Clogged radiator core or damaged radiator cap. Replace cap or clean radiator. Lack of engine coolant. Refill to the correct level and inspect system for leaks. Damaged or worn fan belt. The fan belt needs to be replaced. Engine oil level is low. Add oil to the engine crankcase.

Engine power is too low: Clogged or burnt injection nozzle. Clean or replace injection nozzles. Fuel lines or hoses are clogged. Clean fuel system hoses and lines. Plugged air filter. Replace air filter element. Leaking cylinder head gasket. Install a new gasket.

Engine knocking sound or abnormal noise: Coolant temperature is low. Warm up to required temperature. Engine oil insufficient. Check oil level and add oil as required. Incorrect adjustment of fuel injection pump timing. Adjust according to specifications. Worn or broken pistons. Have pistons replaced. Connecting rod is not aligned or worn. Align or replace connecting rod.

Engine stalls while idling: Too low idle RPM. Adjust as required. Incorrect valve clearance. Adjust valve clearance according to specifications. Fuel injection pump is broken. Replacement or repair required.

Low oil pressure: Engine oil insufficient. Checking oil level and add if necessary. Defective oil pump. Repair or replace. Oil filter element is dirty. Replace or service engine oil filter.

Kubota M128X Transmission Troubleshooting

Transmission makes excessive noise: Gears are damaged or backlash is incorrect. Change the gears or set backlash properly. Shift forks are bent or worn out. Install new shift forks. Shaft splines are worn or damaged. Replace the shaft. Transmission oil insufficient. Add oil to the transmission housing. Worn or damaged bearings. Replace faulty bearings. Transmission fluid is dirty. Change the fluid.

Gears are hard to shift: Rusty or worn gear shift linkage. Install new shift linkage. Unadjusted or worn clutch. Adjust or install new clutch. Damaged or worn gear shift forks. Change defective shift forks. Gearshift mechanism malfunction. Identify and replace failed parts.

Low transmission pressure: Low fluid level. Checking transmission fluid level and add if necessary. Transmission oil filter element clogging (if equipped). Clean or change transmission oil filter. Relief valve failure. Install a new relief valve.

Transmission fluid leakage: Damaged seals or gaskets. Install new components. Transmission oil level is exceeded. Correct the oil volume.

Kubota M128X Hydraulics Troubleshooting

Hydraulic system overheating: Wrong hydraulic oil type. Fill up with the correct type of oil. Contaminated hydraulic fluid. Change hydraulic fluid. Air in the hydraulic system. Air bleeding. Faulty main relief valve. Replace relief valve.

Insufficient hydraulic fluid pressure: Low hydraulic fluid level. Fill up the hydraulic fluid. Dirty hydraulic oil filter element. Install a new hydraulic filter element. Leaking hydraulic pipes. Check the hydraulic system and fix leaks. Incorrect setting hydraulic control valve block. Set correctly. Faulty hydraulic pump. Repair or replace hydraulic oil pump. Hydraulic cylinder is broken. Repair or replace hydraulic cylinder.

Hitch not lifting or hitch lifts slowly: Hydraulic pump failure. Replace or repair hydraulic fluid pump. Damaged main relief valve. Install a new relief valve. Hydraulic control valve block is defective. Repair or replace the valve. Faulty hydraulic cylinder. Install a new hydraulic cylinder or repair it. Hydraulic fluid is insufficient. Fill up the hydraulic fluid. Hydraulic fluid filter element is clogged. Service or replace the hydraulic filter. Excessive hitch loading. Reduce hitch load.

3-point hitch does not lower or lowers very slowly: Damaged hydraulic cylinder. Install a new hydraulic cylinder or repair it. Hydraulic control valve is set improperly. The control valve must be set correctly. Damaged hitch rock shaft. Change the shaft. Hitch is out of adjustment. The three-point hitch must be adjusted.

Hitch lifting or lowering is jerky: Contaminated hydraulic oil. Change hydraulic oil. Hydraulic pump failure. Replace or repair hydraulic fluid pump. There is air in the hydraulic system. Bleed hydraulic system. Hydraulic spool valve is damaged. Replace or repair the valve. Hydraulic cylinder not working. Install a new hydraulic cylinder or repair it.

Kubota M128X Steering Troubleshooting

Steering wheel free play is excessive: Steering column shaft or coupling is worn out. Change faulty component. Worn steering pump. Replace or repair steering pump. Steering linkage joints are worn or loose. Repair or change steering linkage. Faulty or worn hydrostatic steering unit. Replace or repair steering unit as required.

Stiff steering: Air trapped inside steering system. Need to bleed air. Steering filter is clogged. Replace steering filter element. Steering oil level is insufficient. Checking steering oil level and add it if necessary. Hydrostatic steering unit is damaged or worn. Inspect and replace as required. Damaged hydraulic steering pump. Install a new steering pump. Worn or stuck pump flow control valve. Replace or service control valve. Incorrectly mounted or defective steering column. Mount the steering column correctly or replace it. Tires have uneven wear. Replace the tires. Not adjusted toe-in. Check and adjust toe-in. Steering cylinder leakage. Damaged cylinder seals or worn piston rod.

Front wheels wander to right or left: Defective or worn hydrostatic steering unit. Inspect and change as required. Steering cylinder is worn. Change or repair hydraulic steering cylinder. Improper toe-in. Adjust toe-in wheels. Loose or worn steering linkage components. Replace or repair steering linkage. Front wheel bearings are defective or improperly adjusted. Change or adjust bearings correctly. Tire pressure is uneven. Adjust the tire pressure.

Kubota M128X Electrical System Troubleshooting

Battery cannot be charged: Loose or corroded wire connections. Tighten or clean electrical wiring connections. Battery terminal clamps are faulty. Replace terminal clamps. Dead cell in battery. Replace the battery. Damaged or loose belt. Replace belt or adjust belt tension.

Starter turns slowly: Low battery output. Battery needs to be recharged. Battery discharges quickly. Service battery or change it. Disconnected wiring or bad battery terminals. Connect wires properly or change terminals.

Starter is not cranking: Battery is discharged or worn. Charge or replace the battery. Battery cables are disconnected or improperly connected. Inspect cables and connect properly. Low battery output. Low battery charging, charge as required. Starter motor is defective. Starter should be changed.