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Kubota L2501 Troubleshooting
The
Kubota L2501 is a compact utility tractor from L01-series. This model was
manufactured between 2014 and 2021. The tractor was designed in two versions:
L2501F (2WD) and L2501DT (4WD). The Kubota L2501 is equipped with a 100.5 cu.in
(1.65L) Kubota D1703-M-DI-E4 4-cycle vertical 3-cylinder direct injection
naturally aspirated diesel engine with a rated power of 24.8 hp (18.5 kW).
The gear transmission consists of a dry clutch and mechanical gearbox
with 8 forward and 4 reverse gears. Max. travel speed (forward and
reverse): 10.7 mph (17.3 km/h) / 3.9 mph (6.2 km/h). The open center
hydraulic system includes a gear pump with a rated capacity of 5.2 gpm
(19.5 lpm). The main relief pressure is 152 bar (2205 psi). The 2-wheel
drive models are equipped with 5.00x15 front tires and 11.2x24 rear
tires.
The 7.2x16 front tires and 11.2x24 rear tires are used for tractors with
4-wheel drive. The wheelbase is 63.3" (1610 mm). The tractor is
compatible with the following attachments:
Kubota LA525 front-end loader
with lift capacity to full height of 1131 lbs (513 kg), and Kubota BH77
backhoe with 2-ft flat digging depth of 89.8" (2280 mm).
| Engine Troubleshooting |
| Engine won't start or hard to start |
| Fuel filter plugging - Change the filter element |
| Fuel shut-off valve closed - Open the fuel shut-off valve |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Clogged or damaged injectors - Test fuel injectors and change if necessary |
| Fuel injection pump damage - Rebuild or install a new injection pump |
| Poor cylinder compression - Inspect cylinder block and replace worn components |
| Engine stalls while running |
| Engine is cold - Warm up the engine as required |
| Air in fuel lines - Bleed fuel lines |
| Bad fuel injection - Check and adjust |
| Fuel filter is dirty - Clean or change the filter |
| Dirty or faulty injectors - Service or change fuel injectors |
| Engine starts but immediately stops |
| Incorrectly set fuel injection pump timing - Check and correct settings |
| Dirty fuel filter element - Clean or change the filter |
| Fuel injector nozzles are clogged or faulty - Change injector nozzles |
| Fuel injection pump malfunction - Rebuild or replace pump |
| Dirty air cleaner - Service or change air cleaner |
| Engine shuts off while idling |
| Incorrectly adjusted low idle speed - Correct low idle settings |
| Fuel injection pump malfunction - Install a new pump or rebuild |
| Fuel injector nozzles fault - Inspect injector nozzles and change if required |
| Excessive valve clearance - Correct valve clearance |
| Not enough coolant - Top up coolant fluid. Repair any leaks if necessary |
| Cooling system is clogged or cooling components are defective - Flush cooling system or change faulty components |
| Low engine oil level - Fill the crankcase with engine oil |
| Worn fan belt or unadjusted belt tension - Adjust belt tension correctly or change it |
| Defective or wrong type of thermostat - Check and change if necessary |
| Dirty or damaged injectors - Check fuel injectors and replace if required |
| Fuel injection pressure is wrong - Repair or replace injection pump |
| Air filter element clogging - Replace filter or install new filter element |
| Engine oil filter is plugged - Change or clean engine oil filter element |
| Engine overload - Shift to lower gear or reduce the load |
| Excessive valve clearance - Adjustment procedure required |
| Low idle speed setting is incorrect - Adjust the low idle speed |
| Fuel hoses or pipes are dirty - Fuel pipes and hoses need to be cleaned |
| Lack of compression: Worn or damaged valves - Valves need to be replaced |
| Abnormal engine noise or knocking |
| Fuel injection pump timing is incorrect - Adjust injection timing |
| Damaged or clogged injector nozzles - Service or replace nozzles if required |
| Engine oil level is low - Checking oil level and add if necessary |
| Low coolant temperature - Warm up to required temperature |
| Crankshaft or main bearings wear - Change or repair worn components |
| Stuck or worn piston rings - Install new piston rings |
| Loose flywheel bolts - Check flywheel bolts and tighten properly |
| Excessive engine oil consumption |
| Oil leakage: Seals or gaskets are defective - Defective components must be replaced |
| Improper oil viscosity - Use oil of correct viscosity |
| Piston rings are stuck or broken - Piston rings replacement required |
| Worn valve guides and valve stems - Need to replace the valves |
| Scored pistons or cylinder liners - Inspect liners and pistons, change as necessary |
| Electrical System Troubleshooting |
| Battery is not charging |
| Defective battery - Use a new battery |
| Battery electrical wire harness failure - Inspect wires for defects, change or repair |
| Corroded or loose battery cables and terminals - Terminals and cables need to be tightened or cleaned |
| Belt is worn or belt tension is incorrectly adjusted - Change belt or adjust belt tension properly |
| Low battery capacity - Charge the battery |
| Battery is draining quickly - Service or change the battery |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Corroded or loose cables and terminals - Clean or tighten cables and terminals |
| Battery voltage is low - Low battery charging, charge as required |
| Drained or defective battery - Replace or charge as required |
| Faulty starter motor - Change or repair starter |
| Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly |
| Transmission Troubleshooting |
| Gear hard to shift |
| Worn or incorrectly adjusted clutch - Clutch needs to be adjusted or changed |
| Gear shift linkage is stuck or damaged - Service or replace shift linkage |
| Worn or damaged shift forks - Change defective shift forks |
| Defective gearshift mechanism - Replace defective components |
| Insufficient transmission oil pressure |
| Low transmission oil level - Correct the transmission oil level |
| Transmission fluid filter is plugged (if fitted) - Clean or replace the transmission fluid filter |
| Relief valve sticking - Change relief valve |
| Excessive transmission noise |
| Broken or worn bearings - Bearings need to be replaced |
| Oil level is insufficient - Checking transmission oil level and add if necessary |
| Contaminated transmission oil - Transmission oil must be changed |
| Incorrect backlash or gears are defective - Replace gears or adjust backlash properly |
| Worn or damaged shift forks - Shift forks need to be changed |
| Gaskets or seals are defective Replace worn seal or gaskets |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly |
| Main relief valve failure or incorrect setting - Replace or set up the relief valve |
| Dirty hydraulic fluid - The fluid must be changed |
| Air trapped in the hydraulic system - Inspect the pump seals, suction line, and fittings |
| Insufficient hydraulic fluid pressure |
| Hydraulic oil level is low - Check oil level and add hydraulic oil as required |
| Hydraulic fluid filter element clogging - Change the hydraulic filter element or service if required |
| Defective hydraulic pump - Test the pump flow rate and install new pump if required |
| Hydraulic control valve block is defective or set improper - Set properly or replace |
| Hydraulic cylinder failure - Check cylinder components for wear or damage and change if necessary |
| Leakage in hydraulic pipes - Detect leaks in hydraulic system and repair it |
| Hitch won't lift or lifts slowly |
| Hydraulic fluid level is low - Fill the hydraulic system with oil |
| Cold hydraulic oil - Warm up the oil |
| Dirty hydraulic oil filter - Clean or replace the hydraulic filter |
| Hydraulic pump is faulty - Check the pump capacity and replace pump if required |
| Defective or misadjusted main relief valve - Adjust the valve or replace if necessary |
| Damaged or incorrect adjusted hydraulic spool valve - Change or adjust properly |
| Broken hydraulic cylinder - Check cylinder components for damage or wear and change if necessary |
| Broken or loose suction line - Retighten or change |
| 3-point hitch lowers slowly or won't lower |
| Hydraulic control valve block is faulty or out of adjustment - Replace or adjust correctly |
| Hydraulic cylinder is broken - Inspect cylinder components for damage or wear and change if required |
| Hitch cross shaft is worn - Replace the shaft |
| The hitch has any internal mechanical damage - Replace faulty or worn hitch parts |
| Jerky lowering or lifting of the hitch |
| Air trapped in the hydraulic system - Check the suction line, pump seals, and fittings |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Hydraulic pump not working - Check the pump capacity and replace pump if required |
| Defective or incorrect setting hydraulic spool valve block - Adjust properly or replace |
| Hydraulic cylinder is defective - Check cylinder components for wear or damage and change if necessary |
| Steering System Troubleshooting |
| Stiff steering |
| Steering column is broken or improperly installed - Steering column must be installed properly or replaced |
| Aeration in steering system - Need to bleed air |
| Incorrect toe-in adjustment - Adjust toe-in correctly |
| Tire pressure is not correct - Check tire pressure and inflate as required |
| Steering pump malfunction - Repair or replace steering pump |
| Faulty or worn steering control valve - Replace or repair steering valve as required |
| Damaged steering box parts - Repair power steering box |
| Not enough steering fluid - Fill up steering fluid to required level |
| Steering system oil leakage - Retighten the connections of the hydraulic steering lines and hoses |
| Excessive steering wheel play |
| Worn steering column coupling or shaft - Change defective part |
| Steering control valve is worn or defective - Replace or repair steering valve as required |
| Faulty steering box parts - Replace defective parts of power steering box |
| Defective hydraulic steering pump - Install a new steering pump |
| Faulty or worn steering tie-rod ends or linkage - Replace damaged component |
| Tractor pulls to left or right |
| Tires are not properly inflated - Inflate tires as required |
| Incorrect toe-in adjustment - Adjust toe-in wheels properly |
| Worn or faulty steering tie-rod ends or linkage - Replace damaged part |
| Faulty steering box components - Defective parts of power steering box must be replaced |
| Damaged or worn steering control valve - Change or repair steering valve if required |
| Front hub bearings are incorrectly adjusted or worn - Adjust properly or change bearings |
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| Farm Tractors Technical Specifications |
