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Kubota B7510 Troubleshooting

Kubota B7510 Diesel Engine Troubleshooting

Engine starts up hard or won't start: Fuel filter element is dirty. Service or replace the filter. Air in fuel system. Bleed fuel system. Fuel injection nozzles are damaged or dirty. Change fuel injection nozzles. Fuel injection pump malfunctioning. Rebuild or replace pump.

Engine shuts off suddenly while running: Wrong setting of fuel injection pump timing. Adjust according to specifications. Fuel filter element clogging. Replace the filter element. Engine is not fully warmed up. Warm up the engine.

Engine starts and stops suddenly: Fuel filter plugging. Replace the filter element. Fuel injection pump malfunctioning. Install a new pump or rebuild. Air filter plugged. Clean or change the filter.

Engine overheating: Dirty radiator fins or defective radiator cap. Change cap or clean radiator. Coolant level is low. Add coolant and check the components of cooling system. Fan belt is loose or defective. Install new fan belt. Engine oil level is insufficient. Fill up the oil to required level.

Engine power is too low: Fuel injection nozzles are dirty or defective. If necessary, replace with a new nozzle. Restricted fuel lines or hoses. Service fuel lines and hoses. Air filter element clogged. Clean air cleaner element. Damaged cylinder-head gasket. Cylinder-head gasket replacement required.

Engine knocking sound or abnormal noise: Engine is cold. Warm up the engine. Engine oil insufficient. Add oil to the engine crankcase. Fuel injection pump timing is not adjusted. Adjust as recommended. Worn or broken pistons. Have pistons replaced. Connecting rod is worn or not aligned. Connecting rod needs to be replaced or aligned.

Engine stops at idle: Incorrectly set low idle speed. Correct the settings. Improper valve clearance. Need to adjust valve clearance. Faulty fuel injection pump. Repair or install new pump.

Oil pressure is low: Engine oil level low. Fill up the engine oil. Defective oil pump. Check and replace if necessary. Oil filter element is dirty. Service or change engine oil filter element.

Kubota B7510 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. Shift forks need to be replaced. Worn or stuck shaft splines. Replace defective shaft. Low fluid level. Need to add transmission fluid. Worn or cracked bearings. Replace the bearings. Transmission oil contamination. Change the oil.

Gear hard to shift: Corroded or worn gear shift linkage. Install a new gear shift linkage. Malfunction or incorrect clutch adjustment. Replace or adjust clutch. Shift forks are worn or bent. Replace defective shift forks. Defective parts in the gearshift mechanism. Replace defective parts.

Transmission oil pressure is insufficient: Transmission oil insufficient. Need to add transmission oil. Clogged transmission oil filter element (if fitted). Service or replace the transmission oil filter. Relief valve malfunction. Replace valve as required.

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

Hydrostatic Transmission Troubleshooting

Excessive HST transmission noise: Worn or out of adjustment speed control linkage. Change or adjust linkage. Excessive loading. The load should be reduced. Low transmission oil level or contaminated oil. Change transmission oil or top up to proper level. Relief valve is damaged. Replace relief valve. Transmission parts are worm or defective. Replace or repair defective components.

Transmission fluid is too hot: Excessive loading. Load needs to be reduced. Damaged or clogged cooling components. Check all cooling components and clean or replace if required. Insufficient transmission fluid. Add fluid to the transmission housing. Transmission oil filter element clogging. Service or replace the transmission oil filter.

Lack of power: Low fluid level. Add fluid to the transmission housing. Defective relief valve. Replace relief valve as required. Defective or not adjusted speed control pedal linkage. Adjust or install new linkage.

Transmission oil leakage: Clogged oil drain line. Clean or replace drain line. Broken seals or gaskets. Change defective seal or gaskets. Transmission case internal pressure is too high. Repair or replace damaged components.

Kubota B7510 Hydraulics Troubleshooting

Hydraulic system is overheated: Incorrect type of hydraulic oil. The correct type of oil must be used. Contaminated hydraulic fluid. Change hydraulic fluid. Air in hydraulic pipes. Bleed hydraulic pipes. Main relief valve is faulty. Change relief valve.

Hydraulic fluid pressure too low: Hydraulic oil is insufficient. Check and refill the hydraulic oil. Clogged hydraulic oil filter element. Clean the hydraulic filter or install new filter element. Leaks in hydraulic lines. Identify leaks in the system and repair it. Incorrect adjusted hydraulic spool valve. Adjust the spool valve correctly. Damaged hydraulic pump. Repair or replace hydraulic oil pump. Hydraulic cylinder is faulty. Change or repair hydraulic cylinder.

Three-point hitch cannot be lifted or lifting is too slow: Defective hydraulic pump. Replace or repair hydraulic oil pump. Main relief valve failure. Relief valve must be changed. Defective hydraulic spool valve block. Repair or replace the valve. Hydraulic cylinder is faulty. Replace or repair hydraulic cylinder. Hydraulic oil is insufficient. Check and refill the hydraulic oil. Dirty hydraulic fluid filter. Change the hydraulic filter element or service if required. Excessive hitch loading. Reduce the load is required.

3-point hitch does not lower or lowers very slowly: Damaged hydraulic cylinder. Repair or change hydraulic cylinder. Hydraulic spool valve is out of adjustment. Spool valve adjustment required. Damaged lift arm shaft. Replace the shaft. The 3-point hitch is not adjusted. Adjust the hitch.

Hitch lift or drop is jerky: Dirty hydraulic oil. The oil must be changed. Hydraulic pump malfunction. Change or repair hydraulic fluid pump. Air in hydraulic pipes. Bleed hydraulic pipes. Hydraulic spool valve is damaged. Change or repair hydraulic valve. Hydraulic cylinder malfunction. Repair or change hydraulic cylinder.

Kubota B7510 Steering System Troubleshooting

Excessive steering wheel free play: Steering column shaft or coupling is worn out. Replace faulty part. Faulty steering pump. Repair or replace steering pump. Steering linkage assembly is worn or loose. Repair or replace steering linkage. Power steering control valve assembly has malfunction or wear. Repair or change the steering valve.

Steering is difficult: Air lock in hydraulic steering system. Need to bleed air. Steering filter is plugged. Service or replace the steering filter. Steering fluid level is low. Check fluid level and add steering fluid as required. Power steering control valve assembly is worn or defective. Inspect and replace as required. Steering pump not working. Check the steering pump and replace if necessary. Pump flow control valve is worn or stuck. Replace or service control valve. Incorrectly installed or worn steering column. Install the steering column correctly or replace it. Tire pressure uneven. Inflate the tires correctly. Improper toe-in. Check and adjust toe-in.

Tractor is pulling to left or right: Power steering control valve assembly has malfunction or wear. Repair or change the steering control valve. Incorrect toe-in. Check toe-in and correct. Loose or worn steering linkage parts. Inspect and replace as required. Front wheel bearings are damaged or incorrectly adjusted. Adjust properly or change bearings. Tires have uneven wear. Replace the tires.

Kubota B7510 Electrical Troubleshooting

Battery will not charge: Electrical wire connections are corroded or loose. Tighten or service connections. Faulty battery terminal connectors. Install new terminal connectors. Faulty cell in battery. Battery replacement required. Damaged or loose belt. Adjust belt tension or install a new belt.

Starter cranks slow: Low battery power. Battery needs to be recharged. Battery is not holding charge. Service battery or replace it. Disconnected cables or faulty battery terminals. Check cable connections and replace or service terminals.

Starter doesn't crank: Battery is discharged or defective. Recharge or change battery. Disconnected or incorrectly connected wires. Inspect battery wires and connect correctly. Low battery power. Battery is drained, charge it. Defective starter motor. Repair or replace starter.