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Kubota L2250 Troubleshooting

The Kubota L2250 is a 2WD or 4WD compact utility tractor. This model was manufactured from 1985 to 1990. The Kubota L2250 driveline includes a Kubota D1302-DI-A 4-cycle vertical 3-cylinder naturally aspirated diesel engine and mechanical shuttle transmission with 8 forward and 7 reverse gears.

A 79.3 cu.in (1.3 L) engine has a cylinder bore of 3.23" (82 mm), piston stroke of 3.23" (82 mm), and rated power of 26.5 hp (19.8 kW). Max. forward speed - 12.9 mph (20.8 km/h), max. reverse speed - 8.2 mph (13.5 km/h). The open center hydraulic system used a gear pump with fluid flow rate of 6.7 gal/min (25.4 l/min).

The hydraulic fluid capacity is 8.2 gal (31 L). The 2WD models (L2250F) are equipped with 4.00x15 front tires and 9.5x24 rear tires. The 6.00x14 front tires and 9.5x24 rear tires are used for 4WD tractors (L2250DT). The wheel base is 64.6" (1640 mm). The Kubota L2250 is compatible with the following attachments: 60" and 72" mid-mount 3-blade mower decks, Kubota BF400G front end loader with lift capacity to max height of 882 lbs (400 kg), and Kubota BL4530 backhoe with maximum digging depth of 90" (2280 mm).

Engine Troubleshooting
Engine doesn't start or difficult to start
Fuel filter is dirty - Install new filter element
No fuel injection - Open fuel cock to inject fuel
There is air in the fuel system - Bleed the system
Fuel injectors are damaged or dirty - Change fuel injectors
Fuel injection pump malfunctioning - Repair or change injection pump
Engine has bad compression - Check and replace worn parts
Diesel stalls while running
Engine is cold - Warm up the engine as required
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Bad fuel injection - Check and adjust
Clogged fuel filter element - Clean or change the filter
Fuel injectors are damaged or dirty - Inspect fuel injectors and replace if necessary
Engine starts and immediately stops
Fuel injection pump timing is incorrect - Adjust the fuel injection pump timing correctly
Fuel filter is clogged - Clean or change the filter
Fuel injector nozzles are damaged - Change or clean injector nozzles
Damaged fuel injection pump - Repair or change injection pump
Clogged air cleaner element - Install new cleaner element or replace it
Engine stalls when idle
Incorrectly adjusted low idle speed - Adjust the low idle speed
Fuel injection pump is damaged - Rebuild or change fuel pump
Fuel injector nozzles are damaged - Inspect injector nozzles and change if required
Valve out of adjustment - Adjustment procedure required
Engine overheats
Not enough coolant - Top up coolant. Repair any leaks if necessary
Cooling system parts are damaged or system is dirty - Replace faulty parts or service cooling system
Engine oil level is insufficient - Fill the crankcase with engine oil
Damaged fan belt or unadjusted belt tension - Change or adjust belt tension correctly
Thermostat failure - Install new thermostat
Engine power loss
Dirty or faulty injectors - Check fuel injectors and replace if required
Fuel injection pressure is incorrect - Test fuel injection pressure and adjust it correctly
Air filter clogging - Service or change air filter
Oil filter element is dirty - Replace or clean engine oil filter element
Engine overloaded - Load reducing required
Excessive valve clearance - Check and adjust
Low idle speed adjustment is incorrect - Adjustment required
Dirt in the fuel pipes or hoses - Service fuel hoses and pipes
Engine compression too low: Leaking or broken valves - Replace the valves as required
Engine knocking sound or abnormal noise
Timing of fuel injection pump is wrong - Check and correct adjustments
Faulty fuel injector nozzles - Test injector nozzles and replace as required
Low engine oil level - Fill up the engine oil
Coolant temperature is low - Normalize the temperature by warming up the engine
Worn crankshaft or main bearings - Worn parts replacement required
Broken or defective piston rings - Replace piston rings
Loose flywheel screws - Inspect the flywheel screws and tighten securely
Diesel engine using too much oil
Oil leaking: Seals or gaskets are defective - Replace defective parts
Wrong oil viscosity - Use proper viscosity oil
Stuck or defective piston rings - Install new piston rings
Worn valve stems and valve guides - Change the valves
Pistons or cylinder liners are scuffed - Check pistons and liners, install new parts as required

Electrical System Troubleshooting
Battery won’t charge
Battery is worn - Replace the battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose terminals and cables - Tighten or service cables and terminals
Belt is worn or belt tension is incorrectly adjusted - Adjust belt tension properly or replace belt
Starter turns slowly
Battery capacity is low - Low battery charging, charge as required
Battery is draining quickly - Battery needs to be serviced or replaced
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Corroded or loose battery terminals and cables - Tighten or clean terminals and cables
Starter is not cranking
Low battery power - Battery is drained, recharge it
Drained or worn battery - Need to charge or replace the battery
Starter motor is damaged - Repair or replace starter
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Gear hard to shift
Worn or incorrectly adjusted clutch - Adjust or install new clutch
Damaged or loose gear shift linkage - Service or replace shift linkage
Damaged or worn shift forks - Shift forks need to be replaced
Gear shifting mechanism is worn - Change worn components
Transmission fluid pressure is insufficient
Low transmission oil level - Fill up the transmission oil
Transmission oil filter clogging (if fitted) - Change or clean the transmission oil filter
Relief valve is faulty - Replace the valve
Transmission makes noise
Bearings are worn or damaged - Replace the bearings
Insufficient oil supply - Correct the transmission oil level
Transmission oil contamination - Change transmission oil
Improper backlash or damaged gears - Change damaged gears or adjust backlash properly
Worn or damaged shift forks - Replace defective shift forks
Transmission oil leakage
Gaskets or seals are broken - Install new components
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Hydraulic system overheats
The system pressure has not been corrected - Make the correct settings
Main relief valve is faulty or misadjusted - Adjust relief valve or change if required
Hydraulic fluid contamination - Change hydraulic fluid
Air in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Insufficient hydraulic fluid pressure
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Hydraulic fluid filter clogging - Replace hydraulic filter element or service if necessary
Faulty hydraulic oil pump - Test the pump flow rate and change pump if required
Hydraulic spool valve is not set properly or defective - Change or adjust correctly
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hydraulic pipes are leaking - Detect leaks in the system and fix it
Three-point hitch lifting is too slow or cannot be lifted
Hydraulic fluid level is insufficient - Fill the hydraulic system with oil
Cold hydraulic fluid - Warm up the fluid
Hydraulic fluid filter element is dirty - Clean or replace the hydraulic filter
Faulty hydraulic oil pump - Check hydraulic pump flow and replace pump if necessary
Main relief valve incorrect adjustment or failure - Adjust the valve or replace if necessary
Defective or not adjusted hydraulic spool valve - Adjust correctly or replace
Broken hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary
Broken or loose suction line - Retighten or change
3-point hitch won't drop or drops slowly
Damaged or incorrect adjusted hydraulic control valve - Adjust correctly or change
Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace if necessary
Hitch rock shaft is damaged - Install a new shaft
The hitch has internal mechanical malfunctions - Replace faulty or worn hitch components
Hitch lower or lift is jerky
Aeration in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Hydraulic oil contamination - Change the oil
Hydraulic pump not working - Check hydraulic pump flow and replace pump if necessary
Hydraulic spool valve block is not set properly or defective - Adjust properly or change
Hydraulic cylinder malfunction - Inspect cylinder components for damage or wear and change if required

Steering System Troubleshooting
Steering wheel is difficult to turn
Steering column is worn or incorrectly mounted - Change the steering column or mount it correctly
Air trapped in the steering system - Bleed the steering system
Not adjusted toe-in - Adjust toe-in correctly
Tire pressure is improper - Inflate the tires properly
Worn steering pump - Steering pump needs to be repaired or replaced
Damaged or worn steering valve assembly - Repair or change the steering valve
Worn power steering box components - Defective parts of power steering box must be replaced
Steering oil insufficient - Check and refill steering oil
Steering system oil leakage - Tighten the steering hose and line joints
Steering wheel has too much free-play
Steering column coupling or shaft has maximum wear - Replace faulty component
Steering valve assembly is damaged or worn - Repair or replace the steering valve
Worn power steering box parts - Change defective power steering box components
Steering pump malfunction - Steering pump needs to be repaired or replaced
Faulty or worn steering tie-rod ends or linkage - Change failed part
Front wheels wander to left or right
Tires are deflated - Need to inflate tires
Improper toe-in adjustment - Adjust toe-in correctly
Worn or faulty steering linkage or tie-rod ends - Change damaged part
Worn power steering box components - Defective power steering box components must be replaced
Steering valve assembly has wear or damage - Inspect and replace as required
Front hub bearings are worn or incorrectly adjusted - Adjust properly or replace bearings



Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294