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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
