________________________________________________________________________________

Kubota MX5800 Troubleshooting

Kubota MX5800 Engine Troubleshooting

Engine starts up hard or doesn't start: Fuel filter element is dirty. Filter maintenance required. Air in the fuel lines. Bleed the fuel lines. Clogged or defective injection nozzles. Test injection nozzles and change if necessary. Fuel injection pump is not working correctly. Change or repair the pump.

Engine stops unexpectedly during operation: Timing of fuel injection pump is incorrect. Adjust according to specifications. Fuel filter plugged. Change the filter element. Engine not warmed up. Normalize the temperature by warming up the engine.

Engine starts but then stalls: Fuel filter plugged. Clean or replace the filter. Fuel injection pump is defective. Replacement or repair required. Intake air restriction. Clean or change the filter.

Engine overheated: Clogged radiator fins or damaged radiator cap. Clean radiator or change cap. Engine coolant is insufficient. Fill the cooling system and check components for leaks or other faults. Damaged or worn fan belt. Change as required. Engine oil level is low. Check and refill engine oil.

Engine lacks power: Fuel injection nozzles are dirty or defective. Replace injection nozzles. Dirt in the fuel hoses or lines. Clean fuel hoses and lines. Air filter element clogged. Clean or change. Defective cylinder head gasket. Replace cylinder head gasket.

Engine knocks or noises: Engine is not preheated. Normalize the temperature by warming up the engine. Insufficient engine oil. Check and refill engine oil. Fuel injection pump timing is wrong. Set it up as required. Scored or worn pistons. Have pistons replaced. Connecting rod is misaligned or defective. Need to change or align the connecting rod.

Engine stalls when idling: Low idle speed setting is not correct. Correct the settings. The valve clearance is incorrect. Check and adjust. Faulty fuel injection pump. Rebuild or change fuel pump.

Oil pressure is insufficient: Not enough oil in the engine. Fill up the engine oil. Oil pump malfunction. Replace as required. Dirty oil filter. Clean or replace engine oil filter element.

Kubota MX5800 Hydrostatic Transmission Troubleshooting

HST transmission noises: Worn or out of adjustment speed control linkage. Adjust or change linkage. Transmission is under excessive load. Reduce transmission load. Contaminated transmission fluid or low fluid level. Add fluid to the correct level or fill the transmission with fresh fluid. Relief valve is stuck. Replace the valve. Defective or worn transmission parts. Replace or repair defective components.

Transmission fluid overheated: Excessive transmission load. The load should be reduced. Defective or plugged cooling components. Check all cooling components and repair or change if required. Transmission oil insufficient. Fill up the transmission oil. Transmission oil filter element clogging. Service or replace the transmission oil filter.

Low power: Lack of transmission oil supply. Fill up the transmission oil. Relief valve failure. Change the valve. Bent or unadjusted speed control pedal linkage. Repair or adjust linkage.

Transmission oil leaks: Clogged oil return pipe. Clean or change return pipe. Worn seals or gaskets. Seals and gaskets need to be replaced. Transmission case internal pressure is too high. Check transmission parts for damage or wear and replace if required.

Kubota MX5800 Hydraulic System Troubleshooting

Hydraulic system overheated: Hydraulic oil type is incorrect. Pour the correct type of oil. Hydraulic fluid contamination. Change hydraulic fluid. Air in hydraulic pipes. Bleed hydraulic pipes. Main relief valve is faulty. Change relief valve.

Low hydraulic system pressure: Low hydraulic fluid level. Fill up the hydraulic fluid. Clogged hydraulic oil filter element. Install a new hydraulic filter element. Leaking hydraulic lines. Inspect hydraulic system for leaks and repair it. Hydraulic control valve is out of adjustment. Need to make adjustment. Defective hydraulic pump. Repair or replace hydraulic fluid pump. Defective hydraulic cylinder. Repair or change hydraulic cylinder.

Hitch won't raise or raises slowly: Defective hydraulic pump. Change or repair hydraulic fluid pump. Main relief valve malfunction. Change relief valve. Hydraulic control valve block is faulty. Repair or change hydraulic valve. Hydraulic cylinder malfunction. Change or repair hydraulic cylinder. Hydraulic fluid is insufficient. Add fluid as required. Hydraulic oil filter element is clogged. Change hydraulic filter element or clean if necessary. Excessive hitch loading. Reduce the load is required.

Three-point hitch cannot be dropped or dropping is too slow: Defective hydraulic cylinder. Install a new hydraulic cylinder or repair it. Hydraulic control valve block is not set properly. Use the proper setting. Hitch rock shaft is damaged. Change the shaft. 3-point hitch is out of adjustment. The hitch must be adjusted.

3-point hitch jerks when lower or lift: Contaminated hydraulic oil. Change hydraulic oil. Hydraulic pump not working. Repair or replace hydraulic fluid pump. There is air in the hydraulic system. Bleed hydraulic system. Hydraulic spool valve block is faulty. Repair or replace the valve. Hydraulic cylinder is faulty. Repair or change hydraulic cylinder.

Kubota MX5800 Steering System Troubleshooting

Excessive steering wheel free play: Worn steering column shaft or coupling. Change defective part. Hydraulic steering pump is defective. Steering pump needs to be replaced or repaired. Steering linkage assembly is worn or loose. Inspect and change as required. Hydrostatic steering unit is damaged or worn. Check and replace as required.

Steering wheel is very heavy to turn: Air in steering system. Air-bleed steering system. Clogged steering filter element. Clean or change it. Steering oil insufficient. Check and refill steering oil. Hydrostatic steering unit is damaged or worn. Inspect and replace as required. Faulty steering pump. Repair or change steering pump. Worn or stuck pump flow control valve. Clean or replace control valve. Defective or incorrectly mounted steering column. Change steering column or mount correctly. Tires have uneven wear. Replace the tires. Not adjusted toe-in. Check and adjust toe-in. Leaking steering cylinder. Change damaged piston rod or worn seal sleeves.

Tractor pulls to right or left: Hydrostatic steering unit has malfunction or wear. Change or repair steering unit if required. Steering cylinder is worn. Replace or repair hydraulic steering cylinder. Improper toe-in. Adjust toe-in wheels. Loose or worn steering linkage components. Inspect and replace as required. Improperly adjusted or defective front hub bearings. Adjust correctly or install new bearings. Uneven wear on front tyres. Replace the tyres.

Kubota MX5800 Electrical Troubleshooting

Battery cannot be charged: Corroded or loose electrical wire connections. Clean or tighten connections. Battery terminal connectors are defective. Terminal connectors should be replaced. Defective battery. Battery replacement required. Loose or worn belt. Change belt or adjust belt tension.

Starter cranks slowly: Battery capacity is low. Recharge the battery. Battery does not hold charge. Battery needs to be serviced or replaced. Faulty battery terminals or disconnected cables. Check wire connections and change or service terminals.

Starter does not work: Battery is discharged or worn. Recharge or replace battery. Battery cables are disconnected or incorrectly connected. Check cables and connect as needed. Low battery output. Charge the battery. Faulty starter motor. Repair or replace starter.