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Kubota B2650 Troubleshooting

Kubota B2650 Diesel Engine Troubleshooting

Engine starts hard or will not start: Clogged fuel filter. Filter maintenance required. Air in the fuel system. Air bleeding. Fuel injection nozzles are damaged. Install a new kit of correctly balanced nozzles. Faulty fuel injection pump. Rebuild or change fuel pump.

Engine shuts off while running: Incorrect adjustment of fuel injection pump timing. Use the correct fuel injection pump timing adjustment. Clogged fuel filter. Clean or replace the filter. Low coolant temperature. Warm up to required temperature.

Diesel starts and stalls immediately: Fuel filter element clogging. Install new filter element. Fuel injection pump damage. Repair or replace injection pump. Air filter element clogged. Carry out maintenance on air filter.

Engine overheats: Defective radiator cap or clogged radiator core. Change cap or clean radiator. Coolant level is low. The cooling system needs to be refilled and checked for faults. Fan belt slipping or worn. Change the fan belt. Insufficient engine oil. Fill up the engine oil.

Reduced engine power: Dirty or damaged injection nozzles. Install a new kit of correctly balanced nozzles. Restricted fuel lines or hoses. Clean fuel lines and hoses. Air filter element clogged. Change air filter element. Leaking cylinder head gasket. Cylinder-head gasket replacement required.

Engine knocking or noise: Engine has not warmed up to the recommended temperature. Normalize the temperature by warming up the engine. Engine oil level low. Fill up the engine oil. Fuel injection pump timing is not adjusted. Set the fuel pump timing correctly. Piston wear or scoring. Pistons need to be replaced. Connecting rod is worn or misaligned. Replace or align connecting rod.

Engine stalls when idle: Incorrectly set low idle speed. Correct low idle adjustment. Valve clearance is out of adjustment. Adjustment procedure required. Faulty fuel injection pump. Repair or install a new fuel pump.

Oil pressure is low: Low oil level. Fill the crankcase with oil. Oil pump is worn or damaged. Replace as required. Plugged engine oil filter. Service or replace engine oil filter.

Kubota B2650 Transmission Troubleshooting

Excessive transmission noise: Incorrect backlash or gears are worn. Install new gears and adjust backlash properly. Damaged or worn gear shift forks. Replace defective shift forks. Shaft splines are worn or stuck. Replace the shaft. Transmission fluid level is low. Add fluid to the transmission housing. Worn or broken bearings. Faulty bearings should be replaced. Transmission fluid contamination. Change the fluid.

Gears are hard to shift: Corroded or worn gear shift linkage. Replace or lubricate the shift linkage. Clutch is worn or not adjusted. Adjust or change the clutch. Shift forks are worn or bent. Shift forks need to be replaced. Gearshift mechanism malfunction. Identify and replace failed parts.

Transmission fluid pressure is insufficient: Lack of transmission fluid. Need to add transmission fluid. Clogged transmission oil filter element (if fitted). Clean or change transmission oil filter. Defective relief valve. Replace relief valve.

Transmission fluid leaks: Seals or gaskets are worn. Gaskets or seal replacement required. Transmission oil level is high. Correct the oil volume.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission noises: Defective or not adjusted speed control pedal linkage. Adjust or replace linkage. Excessive transmission load. Reduce the load is required. Dirty transmission fluid or insufficient fluid level. Add fluid to the correct level or fill the transmission with fresh fluid. Defective relief valve. Replace the valve. Damaged or worn components of hydrostatic transmission. Check internal transmission parts for damage or wear and replace if required.

Transmission oil overheated: Excessive loading. Reduce the load is required. Clogged or damaged cooling components. Check all cooling components and clean or replace if required. Insufficient transmission fluid. Add fluid to the transmission housing. Transmission oil filter is dirty. Clean or replace the transmission filter.

Power is insufficient: Transmission oil insufficient. Need to add transmission oil. Stuck relief valve. Replace relief valve. Worn or out of adjustment speed control linkage. Adjust or repair linkage.

Transmission fluid leakage: Clogged oil return pipe. Clean or change return pipe. Damaged gaskets or seals. Change defective gaskets or seal. Transmission case internal pressure is too high. Replace worn components.

Kubota B2650 Hydraulic System Troubleshooting

Hydraulic system overheating: Hydraulic oil type is wrong. Correct type of oil must be used. Dirty hydraulic fluid. The fluid must be changed. Air in hydraulic pipes. Bleed hydraulic pipes. Main relief valve malfunction. Relief valve must be changed.

Hydraulic oil pressure is low: Hydraulic oil is insufficient. Need to add oil. Clogged hydraulic oil filter element. Clean or change hydraulic filter. Leaks in hydraulic pipes. Check the system and repair leaks. Not adjusted hydraulic control valve. Need to adjust. Hydraulic pump not working. Install a new hydraulic fluid pump. Broken hydraulic cylinder. Repair or install a new hydraulic cylinder.

Hitch not raising or hitch raises slowly: Damaged hydraulic pump. Replace or repair hydraulic fluid pump. Main relief valve malfunction. Replace relief valve. Hydraulic control valve block is defective. Replace or repair the valve. Hydraulic cylinder not working. Repair or install a new hydraulic cylinder. Low hydraulic oil level. Checking hydraulic oil level and add if necessary. Clogged hydraulic oil filter. Clean the hydraulic filter or install new filter element. Excessive load on hitch. Reduce loading.

3-point hitch does not lower or lowers very slowly: Defective hydraulic cylinder. Install a new hydraulic cylinder or repair it. Not adjusted hydraulic control valve. Need to adjust. Hitch cross shaft is damaged. Install a new shaft. Unadjusted hitch. Adjust 3-point hitch as required.

Hitch lower or lift is jerky: Contaminated hydraulic fluid. Change hydraulic fluid. Defective hydraulic pump. Change or repair hydraulic fluid pump. There is air in the hydraulic system. Bleed hydraulic system. Defective hydraulic control valve. Replace or repair the valve. Hydraulic cylinder is faulty. Repair or install a new hydraulic cylinder.

Kubota B2650 Steering System Troubleshooting

Steering wheel free play is excessive: Steering column shaft or coupling is worn out. Change faulty part. Worn steering pump. Replace or repair steering pump. Worn or loose steering linkage joints. Replace or repair steering linkage. Defective or worn steering control valve. Change or repair control valve if required.

Steering is hard: Air in steering hydraulic system. Bleed air from system. Dirty steering filter element. Clean or change it. Low steering oil level. Fill up the steering oil. Steering control valve has wear or malfunction. Repair or change the control valve. Steering pump is faulty. Replace or repair steering pump. Stuck or faulty steering pump control valve. Clean or replace control valve. Incorrectly assembled or damaged steering column. Reassemble the steering column correctly or change it. Uneven tire pressure. Inflate the tires properly. Incorrect toe-in. Check and adjust toe-in. Leaking steering cylinder. Damaged cylinder seals or worn piston rod.

Front wheels wander to left or right: Steering control valve has damage or wear. Replace or repair steering control valve as required. Steering cylinder is worn. Repair or replace hydraulic steering cylinder. Incorrect toe-in. Adjust toe-in wheels. 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. Tire pressure uneven. Inflate the tires correctly.

Kubota B2650 Electrical System Troubleshooting

Battery cannot be charged: Electrical cable connections are corroded or loose. Tighten or clean connections. Defective battery terminal clamps. Replace terminal clamps. Bad cell in battery. Change the battery. Belt is defective or loose. Replace belt or adjust belt tension.

Starter turning slow: Low battery output voltage. Charge the battery. Battery discharges quickly. Service charging system or install new battery. Corroded battery terminals or disconnected wires. Check battery wires and service or replace terminals.

Starter is not working: Battery is discharged or defective. Charge or change the battery. Wire harness is disconnected or incorrectly connected. Check wire harness and connect as required. Battery voltage is low. Battery is drained, charge it. Starter motor is faulty. Replace or repair starter.