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Kubota B7500 Troubleshooting

Kubota B7500 Engine Troubleshooting

Engine starts hard or won't start: Fuel filter element is dirty. Service or replace the filter. Air in the fuel lines. Bleed the fuel lines. Dirty or faulty injection nozzles. If necessary, replace with a new nozzle. Fuel injection pump is defective. Replace or repair injection pump.

Engine shuts off suddenly during operation: Improper setting of fuel injection pump timing. Set the fuel pump timing correctly. Fuel filter element is dirty. Replace filter element. Engine is not fully warmed up. Warm up the engine.

Engine starts but stops suddenly: Fuel filter plugging. Install new filter element. Fuel injection pump is damaged. Repair or install new pump. Dirty air filter element. Service or replace the air filter.

Engine overheats: Radiator core is clogged or radiator cap is leaking. Clean radiator or replace cap. Insufficient coolant. The cooling system needs to be refilled and checked for faults. Fan belt is worn or faulty. If necessary, replace the belt. Not enough engine oil. Add oil to the engine crankcase.

Engine power is reduced: Clogged or burnt injection nozzle. Clean or change injection nozzles. Restricted fuel hoses or lines. Clean fuel system hoses and lines. Clogged air filter element. Install new air filter element. Cylinder head gasket is damaged. Replace the gasket as required.

Engine noises or knocks: Engine is not preheated. Engine is not warmed up to the required temperature. Lack of engine oil. Add oil to the engine crankcase. Improper setting of fuel injection pump timing. Adjust according to specifications. Broken or worn pistons. Install new pistons. Connecting rod is defective or misaligned. Align or replace connecting rod.

Engine stalls while idling: Too low idle RPM. Adjust the low idle speed. The valve clearance is incorrect. Adjust to proper valve clearance. Fuel injection pump malfunctioning. Replacement or repair required.

Low oil pressure: Engine oil insufficient. Need to add oil. Oil pump is damaged. Remove and inspect oil pump. Dirty oil filter element. Clean or change engine oil filter.

Kubota B7500 Transmission Troubleshooting

Transmission is excessively noisy: Gears are defective or backlash is improper. Change worn gears or adjust backlash correctly. Worn or bent gear shift forks. Shift forks need to be replaced. Worn or stuck shaft splines. Shaft need to be changed. Low oil level. Fill the transmission housing with oil. Bearings are cracked or worn. Install new bearings. Transmission fluid is dirty. Fill up with fresh transmission fluid.

Hard shifts: Stuck or worn gear shift linkage. Lubricate or replace shift linkage. Clutch is worn or not adjusted. Clutch adjustment or replacement required. Worn or bent gear shift forks. Change defective shift forks. Gear shifting mechanism is defective. Defective parts must be replaced.

Low transmission pressure: Low fluid level. Need to add transmission fluid. Transmission oil filter element clogging (if equipped). Service or replace the transmission oil filter. Defective relief valve. Install a new relief valve.

Transmission fluid leakage: Seals or gaskets are worn. Install new gaskets or seal. Transmission oil level is exceeded. Correct the oil volume.

Hydrostatic Transmission Troubleshooting

HST transmission noise: Speed control linkage is defective or unadjusted. Replace or adjust linkage. Transmission overload. Reduce the load is required. Insufficient oil level or contaminated oil. Change transmission oil or top up to proper level. Relief valve is damaged. Replace the valve. Defective or worn transmission parts. Replace or repair defective components.

Transmission fluid overheats: Transmission overload. The load should be reduced. Cooling components are clogged or damaged. Inspect all cooling components and replace or clean if necessary. Insufficient transmission fluid. Need to add transmission fluid. Plugged transmission oil filter. Clean or replace the transmission filter.

Loss of power: Low fluid level. Add fluid to the transmission housing. Relief valve failure. Replace the valve. Speed control linkage is worn or unadjusted. Change or adjust linkage.

External fluid leaks: Oil drain pipe is plugged. Check pipe and service if necessary. Seals or gaskets are worn. Install new seal or gaskets. Internal transmission housing pressure is too high. Replace worn components.

Kubota B7500 Hydraulics Troubleshooting

Hydraulic system overheated: Wrong hydraulic fluid type. Pour the proper type of fluid. Hydraulic oil is dirty. Hydraulic oil change required. Air trapped in hydraulic system. Bleed air from system. Main relief valve is damaged. Replace relief valve.

Hydraulic oil pressure is low: Hydraulic oil level low. Check and refill the hydraulic oil. Clogged hydraulic fluid filter. Hydraulic filter maintenance required. Leaks in hydraulic lines. Check the hydraulic system and fix leaks. Hydraulic control valve block is not set properly. Use the proper setting. Hydraulic pump failure. Change or repair hydraulic oil pump. Defective hydraulic cylinder. Repair or change hydraulic cylinder.

Hitch can't lift or lifts too slowly: Faulty hydraulic pump. Replace or repair hydraulic fluid pump. Faulty main relief valve. Install a new relief valve. Hydraulic spool valve is damaged. Replace or repair the valve. Defective hydraulic cylinder. Repair or replace hydraulic cylinder. Hydraulic fluid is insufficient. Fill up the hydraulic fluid. Hydraulic oil filter is clogged. Clean or change hydraulic filter. Excessive load on hitch. Reduce loading.

Hitch not lowering or hitch lowers slowly: Broken hydraulic cylinder. Change or repair hydraulic cylinder. Hydraulic control valve block is out of adjustment. Control valve needs to be adjusted. Hitch rock shaft is damaged. Install a new shaft. Misadjusted hitch. Adjustment is required.

3-point hitch jerks when lower or lift: Contaminated hydraulic fluid. Change hydraulic fluid. Faulty hydraulic pump. Install a new hydraulic oil pump. Air in the hydraulic system. Air bleeding. Hydraulic spool valve is damaged. Repair or change the valve. Hydraulic cylinder malfunction. Repair or change hydraulic cylinder.

Kubota B7500 Steering System Troubleshooting

Steering wheel has too much free-play: Steering column shaft or coupling has maximum wear. Replace faulty part. Damaged hydraulic steering pump. Repair or change steering pump. Steering linkage joints are worn or loose. Check and replace as required. Worn or damaged power steering control valve assembly. Change or repair steering control valve if required.

Steering is stiff: Air trapped inside steering system. Bleed air from system. Dirty steering filter. Clean or replace the element. Insufficient steering fluid. Fill up the steering fluid. Power steering control valve assembly has wear or malfunction. Replace or repair control valve assembly as required. Damaged hydraulic steering pump. Steering pump needs to be repaired or replaced. Stuck or damaged steering pump control valve. Clean or replace control valve. Improperly fitted or damaged steering column. Refit or change the steering column. Uneven tyre pressure. Inflate the tyres properly. Incorrect toe-in. Check toe-in and correct.

Front wheels wander to left or right: Worn or damaged power steering control valve assembly. Inspect and change as required. Incorrect toe-in. Check and adjust toe-in. Steering linkage components are loose or worn. Inspect and replace as required. Improperly adjusted or worn front wheel bearings. Replace or adjust the bearings correctly. Front tyres wear unevenly. Change the tyres.

Kubota B7500 Electrical Troubleshooting

Battery does not charge: Loose or corroded cable connections. Clean or tighten wiring connections. Faulty electrical terminal connectors. Terminal connectors need to be changed. Battery faulty cell. Use a new battery. Loose or worn belt. Adjust belt tension or change the belt.

Starter motor cranks slow: Low battery output voltage. Battery is drained, charge it. Battery is draining quickly. Service charging system or install new battery. Bad terminals or disconnected battery cables. Check wiring and clean or replace terminals.

Starter doesn't crank: Battery is discharged or worn. Recharge or replace battery. Wire harness is disconnected or incorrectly connected. Check wire harness and connect as required. Low battery voltage. Recharge the battery. Starter motor is defective. Change or repair starter.