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Kubota MX5400 Troubleshooting

Kubota MX5400 Diesel Engine Troubleshooting

Diesel engine hard to start or doesn't start: Fuel filter element is dirty. Clean the filter or install new filter element. Air in the fuel lines. Bleed the fuel lines. Fuel injection nozzles are damaged or dirty. Replace injection nozzles. Fuel injection pump is not operating properly. Rebuild or install a new injection pump.

Engine stops unexpectedly during operation: Incorrect adjustment of fuel injection pump timing. Adjust according to specifications. Dirty fuel filter. Change filter element. Engine not warmed up. Warm up engine as required.

Engine starts but then stalls: Fuel filter element is clogged. Replace filter element. Fuel injection pump is faulty. Rebuild or install a new injection pump. Plugged air filter. Change air filter element.

Engine overheating: Faulty radiator cap or dirty radiator fins. Install new cap or clean radiator. Low coolant level. Add coolant fluid to cooling system and also check it for leaks. Loose or defective fan belt. Belt change is required. Engine oil level low. Add oil to the engine crankcase.

Engine power loss: Clogged or defective injection nozzles. Install a new kit of correctly balanced nozzles. Dirt in the fuel hoses or lines. Service fuel hoses and lines. Dirty air filter element. Replace air filter element. Cylinder-head gasket is broken. Gasket should be replaced.

Engine noise or knocking: Engine has not warmed up to the recommended temperature. Warm up to required temperature. Insufficient engine oil. Fill the crankcase with engine oil. Wrong setting of fuel injection pump timing. Adjust according to specifications. Broken or worn pistons. Install new pistons. Connecting rod is worn or misaligned. Align or replace connecting rod.

Engine stops while idling: Incorrect low idle setting. Normalize low idle speed. Valve clearance is wrong. Adjust to proper valve clearance. Damaged fuel injection pump. Change or repair the pump.

Low oil pressure: Engine oil insufficient. Fill crankcase to proper oil level. Defective oil pump. Remove and inspect oil pump. Oil filter element is dirty. Change or clean engine oil filter element.

Kubota MX5400 Transmission Troubleshooting

Transmission makes excessive noise: Damaged gears or incorrect backlash. Install new gears and set backlash correctly. Worn or bent gear shift forks. Change the shift forks. Shaft splines are worn or damaged. Replace defective shaft. Transmission fluid insufficient. Check and refill the transmission fluid. Bearings are cracked or worn. Replace faulty bearings. Transmission fluid is dirty. Change the fluid.

Gear hard to shift: Worn or rusty gear shift linkage. Shift linkage need to be replaced. Malfunction or incorrect clutch adjustment. Clutch adjustment or replacement required. Shift forks are worn or bent. Replace the shift forks. Worn parts of the gear shifting mechanism. Change worn parts.

Insufficient transmission fluid pressure: Insufficient transmission fluid. Fill the transmission housing to proper fluid level. Transmission oil filter is clogged (if fitted). Clean or change transmission oil filter. Relief valve malfunction. Replace the valve.

Transmission oil leaking: Seals or gaskets are worn. Seals and gaskets replacement required. Too much oil in transmission. Drain the excess oil.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission is making noise: Defective or not adjusted speed control pedal linkage. Adjust or change linkage. Excessive transmission load. The load should be reduced. Dirty transmission fluid or insufficient fluid level. Pour fresh fluid or add transmission fluid to proper level. Stuck relief valve. Replace relief valve. Worn or defective transmission components. Change or repair defective parts.

Transmission oil over heats: Excessive transmission load. Reduce transmission load. Cooling components are clogged or damaged. Check all cooling components and change or repair if required. Insufficient transmission oil. Fill the transmission housing with oil. Transmission oil filter element clogging. Clean or change transmission oil filter.

Power is too low: Transmission fluid insufficient. Check and refill the transmission fluid. Relief valve malfunction. Install a new relief valve. Defective or not adjusted speed control pedal linkage. Adjust or repair linkage.

Transmission oil leaking: Plugged transmission fluid return tube. Service or replace return tube. Worn seals or gaskets. Gaskets or seal need to be replaced. High internal transmission housing pressure. Change defective components.

Kubota MX5400 Hydraulic System Troubleshooting

Hydraulics overheating: Incorrect hydraulic oil type. Use the correct type of hydraulic oil. Contaminated hydraulic oil. Change hydraulic oil. Air in the hydraulic system. Air bleeding. Faulty main relief valve. Relief valve need to be replaced.

Hydraulic oil pressure is insufficient: Low hydraulic fluid level. Checking hydraulic fluid level and add if necessary. Hydraulic oil filter element is clogged. Install a new hydraulic filter element. Leaks in hydraulic pipes. Find leaks in the system and fix it. Hydraulic spool valve block is not adjusted properly. The spool valve should be properly adjusted. Faulty hydraulic pump. Repair or replace hydraulic fluid pump. Hydraulic cylinder is broken. Install a new hydraulic cylinder or repair it.

Three-point hitch cannot be lifted or lifting is too slow: Hydraulic pump not working. Repair or replace hydraulic fluid pump. Defective main relief valve. Change relief valve. Defective hydraulic spool valve. Repair or replace hydraulic valve. Hydraulic cylinder is defective. Repair or install a new hydraulic cylinder. Hydraulic fluid level low. Fill up the hydraulic fluid. Clogged hydraulic fluid filter. Replace hydraulic filter element or service if necessary. Heavy load on the hitch. Load needs to be reduced.

3-point hitch does not lower or lowers very slowly: Hydraulic cylinder not working. Repair or change hydraulic cylinder. Hydraulic control valve is not set properly. Adjust properly. Lift arm shaft is worn. Replace the shaft. The hitch has not been adjusted. Need to make adjustments.

Hitch lifting or lowering is jerky: Dirty hydraulic fluid. The fluid must be changed. Hydraulic pump is defective. Install a new hydraulic fluid pump. Air in hydraulic lines. Bleed hydraulic lines. Hydraulic spool valve block is defective. Repair or replace the valve. Hydraulic cylinder malfunction. Change or repair hydraulic cylinder.

Kubota MX5400 Steering Troubleshooting

Excessive free play of steering wheel: Worn steering column shaft or coupling. Change faulty component. Steering pump is faulty. Replace or repair steering pump. Worn or loose steering linkage joints. Inspect and change as required. Hydrostatic steering unit has wear or damage. Check and replace as required.

Steering is stiff: Air trapped inside steering system. Bleed air from system. Steering filter clogging. Service steering filter. Insufficient steering fluid. Fill up the steering fluid. Worn or damaged hydrostatic steering unit. Inspect and change as required. Steering pump is faulty. Check the hydraulic steering pump and change if necessary. Steering pump control valve is worn or stuck. Change or flush control valve. Damaged or incorrectly assembled steering column. Replace steering column or assemble correctly. Uneven wear on front tyres. Replace the tyres. Not adjusted toe-in. Adjust toe-in properly. Leaking steering cylinder. Replace scratched piston rod or worn cylinder seals.

Front wheels wander to left or right: Worn or damaged hydrostatic steering unit. Check and replace as required. Steering cylinder is defective. Repair or replace hydraulic steering cylinder. Improper toe-in. Check and adjust toe-in. Steering linkage joints are worn or loose. Change or repair steering linkage. Worn or incorrectly adjusted or worn front wheel bearings. Adjust correctly or change bearings. Front tyres wear unevenly. Change the tyres.

Kubota MX5400 Electrical Troubleshooting

Battery won’t charge: Loose or corroded cable connections. Clean or tighten connections. Faulty battery terminal connectors. Replace terminal connectors. Battery is defective. Battery replacement required. Damaged or loose belt. Adjust belt tension or install a new belt.

Starter turns slowly: Low battery capacity. Recharge the battery. Battery won’t hold charge. Battery needs to be serviced or replaced. Disconnected wiring or bad battery terminals. Check wiring and clean or replace terminals.

Starter will not work: Battery is drained or worn. Recharge or change battery. Wiring is improperly connected or disconnected. Check wiring and connect properly. Low battery output voltage. Battery is drained, recharge it. Starter motor failing. Repair or replace starter.