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Kubota L3250 Troubleshooting

The Kubota L3250 is a two-wheel drive or two-wheel drive compact utility tractor. This model was manufactured from 1989 to 1990. The tractor was designed in 2 versions: L3250F (2WD) and L3250DT (4WD).

The Kubota L3250 is equipped with a 113.6 cubic inches (1.9L) Kubota V1902-DI 4-cycle vertical 4-cylinder direct injection naturally aspirated water-cooled diesel engine with a rated power of 40 hp (29.8 kW). The transmission includes a dry clutch and mechanical shuttle gearbox with 8 forward and 7 reverse gears.

The maximum travel speed (forward and reverse): 13.5 mph (21.7 km/h) / 13.5 mph (21.7 km/h). The open center hydraulic system includes a gear pump with a flow of 7.8 gal/min (29.5 l/min). The hydraulic pressure is 172 bar (2500 psi). The Kubota L3250 is equipped with a power assist steering system, mechanical wet disc brakes, 6.00x16 (AG) or 29x12.50-15 (Turf) front tires, and 13.6x26 (AG) or 21.5x16.1 (Turf) rear tires. The wheelbase is 68.3" (1730 mm). The tractor is compatible with a Kubota BF550 front-end loader with lift capacity to full height of 1213 lbs (550 kg) and breakout force of 2094 lbs (950 kg).

Engine Troubleshooting
Engine won't start or hard to start
Fuel filter is clogged - Filter maintenance required
Fuel is not supplied from the tank to the system - Check the fuel shut-off valve
Air in fuel pipes - Bleed fuel pipes
Fuel injectors are clogged or faulty - Service or change fuel injectors
Fuel injection pump damage - Repair or install new pump
Engine has bad compression - Inspect and replace faulty parts
Engine stalls during operation
Low coolant temperature - Warm up to required temperature
There is air in the fuel system - Bleed the system
Fuel injection failed - Use correct settings
Fuel filter plugging - Clean or replace the filter
Dirty or faulty injectors - Service or change fuel injectors
Engine starts and immediately stalls
Timing of fuel injection pump is not adjusted - Repair or replace fuel injection pump
Fuel filter clogging - Install new filter element
Fuel injector nozzles are dirty or defective - Service or replace injector nozzles
Fuel injection pump is not working correctly - Rebuild or change fuel pump
Air cleaner clogging - Service or change air cleaner
Engine stops at idle
Low idle speed set incorrectly - Normalize low idle speed
Fuel injection pump failure - Repair or install a new fuel pump
Fuel injector nozzles are damaged or dirty - Replace fuel injector nozzles
The valve clearance is incorrect - Correct valve clearance
Engine overheated
Insufficient coolant - Coolant needs to be refilled. Check and repair damage to the cooling system if required
Cooling system is clogged or cooling parts are defective - Replace faulty parts or flush the cooling system
Engine oil insufficient - Fill up the oil to required level
Worn fan belt or improper belt tension - Adjust properly or replace the belt
Defective or wrong type of thermostat - Thermostat needs to be replaced
Engine power is reduced
Fuel injectors are clogged or faulty - Service or change fuel injectors
Uneven fuel injection pressure - Correct the pressure settings
Clogged air filter element - Replace filter or install new filter element
Plugged engine oil filter - Clean or change engine oil filter
Diesel engine is overloaded - Load reducing required
Valve out of adjustment - Check and adjust
Incorrect low idle speed adjustment - Normalize low idle speed
Restricted fuel pipes or hoses - Fuel pipes and hoses need to be cleaned
Engine compression is low: Inlet or outlet valves are defective - Valves need to be replaced
Engine noises or knocks
Fuel injection pump timing is incorrect - Correct injection timing
Fuel injector nozzles are faulty - Replace fuel injector nozzles
Engine oil level low - Fill the crankcase with engine oil
Engine is not warmed up to the required temperature - Warm up the engine
Worn main bearings or crankshaft - Replace crankshaft or bearings
Stuck or worn piston rings - Have piston rings replaced
Loose flywheel bolts - Inspect flywheel bolts and tighten properly
Diesel engine using too much oil
External oil leaks: Gaskets or seals are excessively worn - Change to repair leaks
Crankcase oil too light - Use correct viscosity oil
Worn or stuck piston rings - Replace piston rings
Damaged valve stems or valve guides - Valves must be replaced
Worn pistons or cylinder liners - Inspect pistons and liners, replace as required

Electrical System Troubleshooting
Battery cannot be charged
Worn-out battery - Battery replacement required
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Loose or corroded terminals and cables - Terminals and cables need to be tightened or cleaned
Belt wear or improper belt tension adjustment - Adjust belt tension as required or replace belt
Starter motor cranks slow
Battery power is low - Battery needs to be recharged
Battery won’t hold charge - Service charging system or replace battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose battery cables and terminals - Terminals and cables need to be tightened or cleaned
Starter motor won't turn
Low battery voltage - Charge the battery
Discharged or worn battery - Battery needs to be recharged or replaced
Damaged starter motor - Starter needs to be changed
Improperly connected or disconnected wiring harness - Inspect wiring harness and connect properly

Transmission Troubleshooting
Difficult to shift gears
Clutch is unadjusted or worn - Adjust or replace the clutch
Gear shift linkage is loose or broken - Repair or change shift linkage
Worn or damaged shift forks - Change the shift forks
Gearshift mechanism failure - Change or repair failed components
Lack of transmission oil pressure
Oil level is low - Check transmission oil level and add oil as required
Plugged transmission fluid filter (if equipped) - Change or service the transmission fluid filter
Relief valve is defective - Change the valve
Transmission noise
Cracked or worn bearings - Faulty bearings should be replaced
Not enough oil in transmission - Add transmission oil as required
Dirty transmission oil - Transmission oil must be changed
Backlash is incorrect or gears are worn - Change the gears or adjust backlash correctly
Shift forks are damaged or worn - Shift forks need to be replaced
External fluid leaks
Gaskets or seals are damaged - Change defective seal or gaskets
Transmission case is cracked - Replace case or transmission assembly

Hydraulics Troubleshooting
Excessive hydraulic system heat
Incorrect hydraulic system pressure setting - Change the pressure settings
Main relief valve is damaged or adjusted improperly - Adjust or replace the relief valve
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Aeration in hydraulic system - Inspect the suction line, pump seals, and fittings
Hydraulic oil pressure is low
Lack of hydraulic oil - Fill the hydraulic system with oil
Dirty hydraulic oil filter - Install a new hydraulic filter element
Hydraulic pump is faulty - Test pump performance and replace pump if necessary
Defective or not adjusted hydraulic control valve - Adjust properly or replace
Hydraulic cylinder is broken - Inspect cylinder components for wear or damage and change if required
Leakage in hydraulic lines - Inspect hydraulic system for leaks and repair it
Hitch cannot be lifted or lifting is too slow
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required
Hydraulic fluid is too cold - Allow fluid to warm
Dirty hydraulic oil filter - Service the hydraulic filter or change if required
Hydraulic pump not working - Test the pump flow rate and change pump if required
Unadjusted or defective main relief valve - Set up or change the relief valve
Hydraulic spool valve is faulty or out of adjustment - Set properly or replace
Hydraulic cylinder is broken - Inspect cylinder components for damage or wear and change if required
Broken or disconnected suction line - Connect or replace
Hitch can't drop or drops too slowly
Hydraulic spool valve is not set properly or defective - Replace or set properly
Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required
Damaged hitch rock shaft - Install a new shaft
Hitch has mechanical defects - Replace worn or damaged hitch parts
Jerky lifting or lowering of 3-point hitch
Hydraulic system sucks air - Check the suction line, pump seals, and fittings
Dirty hydraulic oil - The oil must be changed
Faulty hydraulic oil pump - Check the pump capacity and replace pump if required
Hydraulic spool valve is defective or set improper - Replace or adjust properly
Broken hydraulic cylinder - Inspect cylinder components for wear or damage and change if required

Steering System Troubleshooting
Difficult steering
Steering column is broken or improperly installed - Steering column must be installed properly or replaced
Air leaks in steering system - Bleed air
Incorrect toe-in - Adjust toe-in wheels properly
Tire pressure is not correct - Check tire pressure and inflate as required
Worn steering pump - Repair or change steering pump
Worn or defective steering valve assembly - Inspect and replace as required
Faulty power steering box components - Replace defective parts of power steering box
Low steering fluid level - Fill the steering system with fluid
Oil leaks in the steering system - Retighten joints of the hydraulic steering pipes and hoses
Steering wheel free play is excessive
Steering column coupling or shaft is extremely worn out - Change faulty part
Defective or worn steering valve assembly - Inspect and change as required
Faulty power steering box components - Repair power steering box
Steering pump failure - Repair or replace steering pump
Steering linkage or tie-rod ends are worn - Replace damaged component
Tractor is pulling to right or left
Tires are not properly inflated - Inflate tires as required
Incorrect toe-in adjustment - Adjust toe-in wheels properly
Steering tie-rod ends or linkage are defective - Replace failed component
Damaged power steering box parts - Repair power steering box
Damaged or worn steering valve assembly - Check and replace as required
Front hub bearings are defective or improperly adjusted - Change or adjust the bearings properly



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