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Kubota L2950 Troubleshooting

The Kubota L2950 is a 2-wheel drive or 4-wheel drive compact utility tractor from L50-series. This model was manufactured between 1990 and 1993. The Kubota L2950 tractor is powered by 89.2 cubic inches (1.50) Kubota D1462-DI 4 cycle vertical 4-cylinder direct injection water-cooled diesel engine with a rated power of 29 hp (21.7 kW) and 95 Nm (70.2 lb-ft) of peak torque at 1600 rev/min.

The Kubota L2950 is fitted with 2 transmission options: 8x8 mechanical shuttle transmission and glide shift transmission (GST) with 8 forward and 8 reverse gears. Max. travel speed (forward and reverse): 14.8 mph (23.7 km/h) / 12.5 mph (20 km/h). The open center hydraulic system used a gear pump with a flow of 6.8 gpm (25.7 lpm). The hydraulic system pressure is 172 bar (2490 psi).

The 2WD models are equipped with 5.00x15 front tires and 12.4x24 rear tires. The 7.00x16 or 25x8.50-14 front tires and 12.4x24 or 13.6x16 rear tires are used for 4WD tractors. The wheelbase is 64.6" (1640 mm). The Kubota L2950 is compatible with a LB400 front end loader with lift capacity to full height of 882 lbs (400 kg).

Engine Troubleshooting
Engine won't start or hard to start
Fuel filter is clogged - Service or replace the filter
Fuel is not supplied from the tank to the system - Check the fuel shut-off valve
Air trapped in fuel system - Bleed air
Fuel injectors are defective or dirty - Test fuel injectors and change if necessary
Faulty fuel injection pump - Repair or change injection pump
Bad cylinder compression - Check cylinder block and replace defective parts
Engine stops running while driving
Engine has not warmed up to the recommended temperature - Warm up engine as required
Fuel lines leaking air - Tighten clamps, change faulty pipes
Bad fuel injection - Check and adjust
Clogged fuel filter element - Clean or replace the filter
Faulty or dirty injectors - Clean or replace fuel injectors
Diesel engine stops after starting
Incorrectly set fuel injection pump timing - Adjust the fuel injection pump timing correctly
Fuel filter is dirty - Clean the filter or install new filter element
Fuel injector nozzles are dirty or defective - Install new set of properly balanced nozzles
Fuel injection pump is damaged - Replacement or repair required
Air cleaner element is dirty - Install new cleaner element or replace it
Engine shuts off while idling
Too low idle RPM - Correct the settings
Fuel injection pump failure - Rebuild or change fuel pump
Fuel injector nozzles fault - Replace fuel injector nozzles
Valve out of adjustment - Adjust valve clearance according to specifications
Engine overheats
Lack of engine coolant - Top up coolant fluid. If there are leaks in the system, replace worn components
Cooling system parts are failed or system is dirty - Service the cooling system or replace faulty components
Engine oil insufficient - Need to add engine oil
Worn fan belt or unadjusted belt tension - Change or adjust belt tension correctly
Thermostat is defective - Install new thermostat
Engine loses power
Fuel injectors are defective or dirty - Service or change fuel injectors
Uneven fuel injection pressure - Adjust to correct pressure
Dirty air filter - Replace or clean the air filter element
Dirty oil filter - Replace or clean engine oil filter element
Engine overload - Reduce load or shift to lower gear
Valve clearance is not correct - Need to adjust valve clearance
Improperly adjusted low idle speed - Need to adjust idle speed
Clogged fuel hoses or pipes - Fuel pipes and hoses need to be cleaned
Engine losing compression: Leaking or faulty valves - Replace the valves as required
Engine noise or knocking
Fuel injection pump out of timing - Adjust injection timing
Clogged or damaged injector nozzles - Replace fuel injector nozzles
Engine oil insufficient - Check and refill engine oil
Engine is cold - Warm up the engine to required temperature
Main bearings or crankshaft wear - Install new parts
Damaged or defective piston rings - Install new piston rings
Loose flywheel screws - Inspect the flywheel screws and tighten securely
High engine oil consumption
Oil leakage: Gaskets or seals are excessively worn - Replace worn parts to avoid leaks
Oil viscosity is incorrect - Use oil of proper viscosity
Piston rings are defective or worn - Have piston rings replaced
Worn valve stems and valve guides - Change the valves
Scuffed cylinder liners or pistons - Inspect liners and pistons, replace as necessary

Electrical System Troubleshooting
Battery cannot be charged
Faulty cell in battery - Battery replacement required
Battery electrical wire harness damage - Check battery wires for damage, replace or change
Corroded or loose battery terminals and cables - Tighten or clean terminals and cables
Belt is worn or belt tension is incorrectly adjusted - Change belt or correctly adjust belt tension
Starter cranks slowly
Battery voltage is low - Battery is drained, recharge it
Battery is not holding charge - Service charging system or change battery
Battery wiring harness failure - Inspect electrical cables for defects, repair or replace
Battery cables and terminals are loose or corroded - Tighten or service terminals and cables
Starter is not working
Low battery output - Charge the battery
Discharged or worn battery - Need to charge or replace the battery
Starter motor is damaged - Change or repair starter
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Transmission Troubleshooting
Gears are hard to shift
Clutch is not adjusted or faulty - Adjust or change the clutch
Gear shift linkage is stuck or worn - Service or replace shift linkage
Damaged or worn shift forks - Change defective shift forks
Defective gearshift mechanism - Replace defective components
Transmission oil pressure is insufficient
Insufficient oil supply - Fill up the transmission oil
Transmission oil filter element is clogged (if equipped) - Replace or clean transmission oil filter
Damaged relief valve - Replace relief valve
Transmission noises
Bearings are worn or damaged - Replace faulty bearings
Not enough fluid in transmission - Fill the transmission housing with fluid
Transmission oil contamination - Change transmission oil
Damaged gears or improper backlash - Change the gears or adjust backlash correctly
Worn or damaged shift forks - Install new shift forks
Transmission oil leakage
Gaskets or seals are broken - Change defective gaskets or seal
Cracked transmission case - Install a new transmission case

Hydraulics Troubleshooting
Hydraulic system is overheated
The system pressure has not been corrected - Make the correct settings
Defective or misadjusted main relief valve - Set up or change the relief valve
Dirty hydraulic fluid - The fluid must be changed
Air trapped in the hydraulic system - Inspect the pump seals, suction pipe, and fittings
Insufficient hydraulic oil pressure
Lack of hydraulic fluid - Need to add fluid
Hydraulic oil filter element is dirty - Service the hydraulic filter or change if required
Hydraulic pump is defective - Check hydraulic pump flow and replace pump if necessary
Hydraulic spool valve block is faulty or out of adjustment - Replace or set properly
Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace if necessary
Hydraulic pipes are leaking - Detect leaks in hydraulic system and repair it
3-point hitch lifts slowly or won't lift
Lack of hydraulic fluid - Need to add fluid
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter is clogged - Change the hydraulic filter element or service if required
Hydraulic pump malfunction - Test the pump performance and change pump if required
Misadjusted or defective main relief valve - Adjust relief valve or change if required
Hydraulic control valve is defective or set improper - Adjust correctly or change
Faulty hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Damaged or loose hydraulic suction line - Tighten or change it
3-point hitch drops slowly or won't drop
Faulty or incorrect setting hydraulic control valve - Adjust properly or change
Faulty hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Hitch cross shaft is worn - Replace the shaft
Defective mechanical parts of the hitch - Change worn or damaged hitch components
Hitch jerks when drop or lift
Air in hydraulic system - Check the suction line, pump seals, and fittings
Dirty hydraulic fluid - The fluid must be changed
Hydraulic pump is defective - Test pump performance and replace pump if necessary
Hydraulic control valve block is faulty or out of adjustment - Adjust properly or replace
Hydraulic cylinder is defective - Inspect cylinder parts for wear or damage and replace if required

Steering System Troubleshooting
Steering is difficult
Defective or incorrectly installed steering column - Reinstall the steering column or change it
Air in steering system - Need to bleed air
Not adjusted toe-in - Check and adjust toe-in
Tires are not correctly inflated - Inflate tires as necessary
Steering pump is worn - Repair or change steering pump
Hydrostatic steering unit is worn or defective - Inspect and replace as required
Worn or stuck relief valve - Flush relief valve or change if necessary
Steering oil level is insufficient - Checking steering oil level and add it if necessary
Steering system oil leak - Tighten the steering hose and line joints
Excessive steering wheel free play
Worn steering column coupling or shaft - Replace defective part
Hydrostatic steering unit has wear or damage - Inspect and change as required
Defective hydraulic steering pump - Install a new steering pump
Steering linkage or tie-rod ends are defective - Replace damaged part
Tractor is pulling to left or right
Tire pressure is not correct - Check tire pressure and inflate as required
Toe-in adjustment is incorrect - Adjust toe-in wheels properly
Worn or faulty steering linkage or tie-rod ends - Change failed component
Hydrostatic steering unit has wear or damage - Replace or repair steering unit as required
Defective steering cylinder - Repair or change steering cylinder
Incorrectly adjusted or damaged front hub bearings - Adjust correctly or change 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