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Kubota L2900 Troubleshooting
The
Kubota L2900 is a Grand L-series compact utility tractor. This model was
manufactured from 1994 to 1999. The L2900 tractor is powered by Kubota D1503
4-cycle vertical three-cylinder water-cooled diesel engine with max. output
power of 30.5 (22.8) Hp and 90 Nm (67 lb-ft) of max torque at 2300 rev/min.
The Kubota L2900 fitted with 2 transmission options: 8x8 synchronized
shuttle transmission, or power shuttle GST transmission with 8 forward
and 8 reverse gears. Max. forward speed - 15.3 mph (24.6 kph), maximum
reverse speed - 14.1 mph (22.7 kph).
The open center hydraulic system includes a gear pump with fluid flow
rate of 7 gallons per minute (26.5 l/min). The hydraulic pressure is
2490 psi (172 bar). The 2WD models are equipped with 5.00x15 front tires
and 11.2x24 rear tires. The 7.20x16 front tires and 11.2x24 rear tires
are used for 4WD tractors. The wheel base is 65.9" (1670 mm) for 2-wheel
drive models and 65.7" (1660 mm) for 4-wheel drive models. The L2900
tractor can be equipped with the following attachments: Kubota RC72-29
mower deck, Kubota LA481 front end loader, and Kubota BL4690 backhoe.
| Engine Troubleshooting |
| Engine will not start or starts up hard |
| Fuel filter is clogged - Install new filter element |
| Fuel shut-off valve closed - Open the fuel shut-off valve |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Dirty or faulty injectors - Service or change fuel injectors |
| Fuel injection pump is damaged - Replace or repair injection pump |
| Low cylinder compression - Check cylinder block and replace worn parts |
| Diesel stalls while running |
| Coolant temperature is low - Warm up to required temperature |
| Air in fuel lines - Bleed fuel lines |
| Fuel injection failed - Use correct settings |
| Fuel filter clogging - Clean the filter element |
| Fuel injectors are clogged or faulty - Service or change fuel injectors |
| Diesel engine stalls after starting |
| Incorrectly set fuel injection pump timing - Check and correct adjustments |
| Fuel filter plugging - Change the filter element |
| Fuel injector nozzles are damaged - Install new set of properly balanced nozzles |
| Fuel injection pump is not operating properly - Install a new fuel pump or repair |
| Clogged air cleaner - Install new cleaner element or replace it |
| Engine stalls while idling |
| Too low idle RPM - Test and adjust |
| Faulty fuel injection pump - Change pump or rebuild it |
| Damaged or clogged injector nozzles - Install a new set of well-balanced nozzles |
| Valve clearance is not correct - Adjust valve clearance |
| Not enough coolant - Fill cooling system to proper level. Check for coolant leaks |
| Cooling system components are failed or system is clogged - Service the cooling system or replace faulty components |
| Insufficient engine oil - Fill up the engine oil |
| Fan belt tension is improper or belt is damaged - Adjust belt tension correctly or change it |
| Thermostat malfunction - Check and replace if required |
| Faulty or dirty injectors - Test fuel injectors and change if necessary |
| Insufficient fuel injection pressure - Correct the pressure settings |
| Air filter clogging - Service or change air filter |
| Oil filter is dirty - Service or change engine oil filter element |
| Engine overloaded - Reduce load on the engine |
| Valve clearance is out of adjustment - Adjustment procedure required |
| Incorrect low idle setting - Adjust low idle speed |
| Fuel pipes or hoses are dirty - Clean fuel hoses and pipes |
| Insufficient engine compression: Valves are damaged or leaking - Valves need to be replaced |
| Incorrect setting of fuel injection pump timing - Check and correct adjustments |
| Fuel injector nozzles fault - Inspect injector nozzles and change if required |
| Engine oil insufficient - Fill up the oil to required level |
| Engine is not fully warmed up - Warm up the engine |
| Crankshaft or main bearings failure - Change defective components as required |
| Defective or broken piston rings - Piston rings need to be replaced |
| Loose flywheel bolts - Check flywheel bolts and tighten properly |
| Engine using too much oil |
| External oil leaks: Seals or gaskets are defective - New components need to be installed |
| Incorrect oil viscosity - Use oil of correct viscosity |
| Damaged or seized piston rings - Change the piston rings as required |
| Valve guides and stems are worn - Valves need to be changed |
| Scuffed cylinder liners or pistons - Check liners and pistons, change as required |
| Electrical System Troubleshooting |
| Battery does not charge |
| Battery failing - Replace the battery |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Corroded or loose battery terminals and cables - Tighten or service terminals and cables |
| Incorrect belt tension adjustment or worn belt - Adjust belt tension properly or replace belt |
| Low battery output - Recharge the battery |
| Battery runs out quickly - Service or replace the battery |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Loose or corroded battery terminals and cables - Cables and terminals must be tightened or cleaned |
| Battery capacity is low - Battery is drained, charge it |
| Drained or worn battery - Charge or replace the battery |
| Starter motor is defective - Starter should be changed |
| Disconnected or incorrectly connected cables - Inspect battery cables and connect correctly |
| Transmission Troubleshooting |
| Gears are hard to shift |
| Worn or misadjusted clutch - Replace or adjust clutch |
| Gear shift linkage is stuck or worn - Repair or change shift linkage |
| Worn or damaged shift forks - Replace the shift forks |
| Gear shifting mechanism is worn - Change worn components |
| Low transmission pressure |
| Lack of transmission fluid supply - Fill up the transmission fluid |
| Clogged transmission oil filter (if equipped) - Replace or service transmission oil filter |
| Damaged relief valve - Replace valve as required |
| Bearings are worn or broken - Faulty bearings should be replaced |
| Oil level is insufficient - Fill the transmission housing to proper oil level |
| Transmission fluid contamination - Change transmission fluid |
| Damaged gears or improper backlash - Set backlash correctly or change the gears |
| Bent or worn shift forks - Install new shift forks |
| Gaskets or seals are broken - Install new components |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Hydraulic system pressure is not adjusted correctly - Correct adjustment is required |
| Misadjusted or defective main relief valve - Adjust relief valve or change if required |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Air leaks in hydraulic system - Check the pump seals, suction pipe, and fittings |
| Low hydraulic system pressure |
| Hydraulic fluid level is insufficient - Check and refill the hydraulic fluid |
| Hydraulic fluid filter element is dirty - Service the hydraulic filter or change if required |
| Damaged hydraulic oil pump - Check pump capacity and change if necessary |
| Hydraulic spool valve is not set properly or defective - Set properly or replace |
| Defective hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
| Leakage in hydraulic lines - Identify leaks in the system and repair it |
| 3-point hitch lifts slowly or won't lift |
| Lack of hydraulic fluid - Add fluid to the hydraulic system |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic oil filter element is dirty - Clean or replace the hydraulic filter |
| Hydraulic pump is faulty - Test pump flow rate and replace pump if required |
| Main relief valve incorrect adjustment or failure - Adjust or change relief valve |
| Damaged or incorrect adjusted hydraulic control valve - Replace or set properly |
| Hydraulic cylinder is defective - Inspect cylinder parts for wear or damage and replace if required |
| Suction line is damaged or disconnected - Connect or replace |
| 3-point hitch fails to drop or drops slowly |
| Hydraulic control valve is faulty or out of adjustment - Adjust correctly or change |
| Defective hydraulic cylinder - Check cylinder components for wear or damage and change if necessary |
| Lift arm shaft is damaged - Install a new shaft |
| Mechanical parts of the hitch are damaged - Replace damaged or worn hitch parts |
| Jerky lowering or lifting of the hitch |
| Aeration in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Dirty hydraulic oil - The oil must be changed |
| Hydraulic pump is faulty - Test pump performance and replace pump if necessary |
| Damaged or incorrect adjusted hydraulic control valve - Change or set correctly |
| Hydraulic cylinder is not working - Check cylinder parts for damage or wear and replace if necessary |
| Steering System Troubleshooting |
| Excessive effort to steer |
| Defective or incorrectly installed steering column - Reinstall the steering column or change it |
| Aeration in steering system - Bleed air from system |
| Improper toe-in adjustment - Check toe-in and correct |
| Tire pressure is improper - Inflate the tires properly |
| Steering pump not working - Replace or repair steering pump |
| Damaged or worn hydrostatic steering unit - Inspect and change as required |
| Relief valve is seized or faulty - Replace or install new relief valve |
| Low steering oil level - Fill up the steering oil |
| Steering system oil leak - Retighten joints of the hydraulic steering pipes and hoses |
| Excessive steering wheel play |
| Worn steering column coupling or shaft - Change faulty component |
| Damaged or worn hydrostatic steering unit - Replace or repair steering unit as required |
| Hydraulic steering pump is defective - Install a new steering pump |
| Steering tie-rod ends or linkage are worn - Replace damaged part |
| Tractor is pulling to right or left |
| Incorrect tire pressure - Inflate the tires correctly |
| Toe-in adjustment is incorrect - Adjust toe-in properly |
| Steering linkage or tie-rod ends are worn - Change failed part |
| Hydrostatic steering unit is defective or worn - Replace or repair steering unit as required |
| Steering cylinder is damaged - Repair or change steering cylinder |
| Damaged or improperly adjusted or worn front hub bearings - Adjust correctly or replace bearings |
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| Farm Tractors Technical Specifications |
