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Kubota L2500 Troubleshooting
The
Kubota L2500 standard L-series compact utility tractor was manufactured from
1998 to 2000. The Kubota L2500 driveline includes a Kubota D1403 vertical
4-cylinder liquid-cooled diesel engine and sliding gear transmission with 8
forward and 2 reverse gears.
A 85 cu.in (1.4 L) engine has a cylinder bore of 3.15" (80 mm), piston
stroke of 3.64" (92.4 mm), and rated power of 27 hp (20.2 kW) at 2800
rpm. Max. travel speed (forward/reverse): 14.3 mph (22 km/h) and 9.6 mph
(15.5 km/h). The open center hydraulic system used a gear pump with
flow rate of 4.6 gal/min (17.4 l/min).
The hydraulic system
pressure is 2250 psi (155 bar). The L2500DT (4WD) models are equipped
with 7.00x15 front tyres and 11.2x24 rear tyres. The 5.00x15 front tyres
and 11.2x24 rear tyres fit L2500F (2WD) tractors. The wheel base is 61.2
inches (1550 mm). The Kubota L2500 is compatible with a
Kubota LA450S
loader or Kubota LB400 loader with a lift capacity to maximum height of
882 lbs (400 kg), and breakout force of 1653 lbs (750 kg).
| Engine Troubleshooting |
| Engine will not start or hard to start |
| Fuel filter clogging - Install new filter element |
| Fuel is not supplied from the tank to the system - Check the fuel shut-off valve |
| Air trapped in fuel system - Bleed air |
| Clogged or damaged injectors - Change fuel injectors |
| Fuel injection pump is damaged - Replacement or repair required |
| Engine has low compression - Inspect cylinder block and change worn parts |
| Engine shuts off unexpectedly during operation |
| Coolant temperature is low - Warm up the engine to required temperature |
| There is air in the fuel system - Bleed the system |
| Uneven fuel injections - Repair or adjustment |
| Fuel filter is dirty - Change filter element |
| Faulty or dirty injectors - Clean or replace fuel injectors |
| Diesel starts and stalls suddenly |
| Incorrect setting of fuel injection pump timing - Correct injection timing |
| Dirty fuel filter element - Change filter element |
| Clogged or damaged injector nozzles - Check and change nozzles as required |
| Defective fuel injection pump - Repair or install a new fuel pump |
| Air cleaner element clogging - Service or replace the air cleaner |
| Engine stops at low idle speed |
| Wrong adjustment of low idle speed - Correct low idle settings |
| Fuel injection pump malfunctioning - Replacement or repair required |
| Fuel injector nozzles are damaged or dirty - Service or replace nozzles if required |
| Valve clearance is wrong - Check and adjust |
| Coolant level is low - Fill the radiator to the required level. Inspect the system for leaks |
| Cooling system is dirty or cooling parts are failed - Replace faulty parts or flush the cooling system |
| Engine oil level low - Need to add engine oil |
| Damaged fan belt or unadjusted belt tension - Adjust correctly or install new belt |
| Thermostat malfunction - Check and change if necessary |
| Fuel injectors are defective or dirty - Test fuel injectors and change if necessary |
| Uneven fuel injection pressure - Adjust to correct pressure |
| Clogged air filter - Air filter maintenance required |
| Dirty oil filter element - Replace or clean engine oil filter element |
| Diesel engine is overloaded - Shift to lower gear or reduce the load |
| Valve clearance is wrong - Adjust valve clearance according to specifications |
| Wrong adjustment of low idle speed - Correct low idle settings |
| Fuel pipes or hoses are dirty - Service fuel hoses and pipes |
| Loss of compression: Valves are broken or leaking - Valve replacement required |
| Incorrect setting of fuel injection pump timing - Fuel pump timing settings need to be corrected |
| Fuel injector nozzles are dirty or defective - Change injector nozzles |
| Insufficient engine oil - Checking oil level and add if necessary |
| Engine is not preheated - Warm up the engine |
| Worn main bearings or crankshaft - Change or repair worn components |
| Defective or broken piston rings - Replace piston rings |
| Loose flywheel screws - Check the flywheel screws and tighten as required |
| Excessive engine oil consumption |
| Oil leakage: Damaged gaskets or seals - Replace defective parts |
| Incorrect oil viscosity - Fill up with the correct oil viscosity |
| Stuck or worn piston rings - Install new piston rings |
| Valve stems and guides are worn - Replace defective valves |
| Damaged cylinder liners or pistons - Check pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Faulty cell in battery - Battery replacement required |
| Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair |
| Loose or corroded battery cables and terminals - Tighten or clean cables and terminals |
| Belt damage or incorrect belt tension adjustment - Change belt or correctly adjust belt tension |
| Low battery power - Battery is drained, recharge it |
| Battery discharges quickly - Service battery or change it |
| Damaged battery cable harness - Check electrical cables for damage, repair or replace |
| Corroded or loose terminals and cables - Tighten or service cables and terminals |
| Low battery power - Charge the battery |
| Discharged or faulty battery - Recharge or replace battery |
| Starter motor is faulty - Repair or change starter |
| Disconnected or incorrectly connected cables - Need to reconnect cables correctly |
| Transmission Troubleshooting |
| Difficulty shifting gears |
| Clutch is unadjusted or worn - Adjust or replace the clutch |
| Damaged or loose gear shift linkage - Replace or repair the shift linkage |
| Worn or damaged shift forks - Replace the shift forks |
| Faulty gear shifting mechanism - Faulty parts must be changed |
| Transmission fluid pressure is insufficient |
| Fluid level is low - Add transmission fluid as required |
| Transmission oil filter element is clogged (if equipped) - Replace or clean transmission oil filter |
| Damaged relief valve - Replace the valve |
| Bearings are worn or cracked - Change the bearings |
| Oil level is insufficient - Checking transmission oil level and add if necessary |
| Contaminated transmission fluid - Change transmission fluid |
| Defective gears or incorrect backlash - Change damaged gears or adjust backlash properly |
| Damaged or worn shift forks - Change the shift forks |
| Gaskets or seals are broken - Replace worn seal or gaskets |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Hydraulic system is too hot |
| Incorrect hydraulic system pressure setting - Change the pressure settings |
| Unadjusted or defective main relief valve - Adjust or replace the relief valve |
| Contaminated hydraulic oil - Change hydraulic oil |
| Hydraulic system sucks air - Inspect the pump seals, suction line, and fittings |
| Hydraulic oil pressure is low |
| Not enough hydraulic oil in the system - Add oil to the hydraulic system |
| Hydraulic fluid filter is clogged - Replace filter element or clean if required |
| Hydraulic pump is faulty - Check pump performance and change it if necessary |
| Defective or incorrect setting hydraulic spool valve block - Adjust correctly or replace |
| Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary |
| Hydraulic piping leaks - Detect leaks in hydraulic system and repair it |
| Three-point hitch lifting is too slow or cannot be lifted |
| Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid |
| Cold oil in hydraulic system - Wait for oil to warm up |
| Dirty hydraulic oil filter - Install a new hydraulic filter element |
| Faulty hydraulic oil pump - Test the pump performance and change pump if required |
| Defective or misadjusted main relief valve - Replace or set up the relief valve |
| Damaged or incorrect adjusted hydraulic spool valve - Set properly or replace |
| Defective hydraulic cylinder - Inspect cylinder components for wear or damage and change if required |
| Suction pipe is broken or loose - Tighten the pipe or replace it |
| 3-point hitch lowers slowly or won't lower |
| Hydraulic spool valve is faulty or out of adjustment - Set properly or replace |
| Broken hydraulic cylinder - Check cylinder components for wear or damage and change if necessary |
| Damaged lift arm shaft - Install a new shaft |
| Mechanical parts of the hitch are damaged - Change faulty or worn hitch parts |
| 3-point hitch lift or lower is jerky |
| Aeration in hydraulic system - Check the pump seals, suction line, and fittings |
| Hydraulic oil contamination - Change the oil |
| Damaged hydraulic oil pump - Check the pump performance and replace it if required |
| Hydraulic spool valve is not set properly or defective - Adjust properly or replace |
| Broken hydraulic cylinder - Inspect cylinder components for wear or damage and change if required |
| Steering System Troubleshooting |
| Steering wheel is hard to turn |
| Defective or incorrectly installed steering column - Reinstall the steering column or change it |
| Aeration in steering system - Bleed air |
| Incorrect toe-in adjustment - Check toe-in and correct |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Worn steering pump - Install a new steering pump |
| Worn or damaged power steering valve assembly - Check and replace as required |
| Faulty steering box components - Replace defective parts of power steering box |
| Steering fluid level is low - Check fluid level and add steering fluid as required |
| Oil leaks in the steering system - Retighten steering hose and pipe connections |
| Steering wheel has too much free-play |
| Worn steering column coupling or shaft - Replace defective component |
| Damaged or worn power steering valve assembly - Inspect and replace as required |
| Worn steering box parts - Repair power steering box |
| Steering pump is faulty - Steering pump needs to be repaired or replaced |
| Steering tie-rod ends or linkage are worn - Change failed part |
| Front wheels wander to left or right |
| Low tire pressure - Inflate the tires |
| Improper toe-in - Adjust toe-in wheels properly |
| Faulty or worn steering tie-rod ends or linkage - Change damaged part |
| Faulty steering box components - Repair power steering box |
| Defective or worn power steering valve assembly - Replace or repair steering valve as required |
| Incorrectly adjusted or damaged front hub bearings - Change or adjust the bearings properly |
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| Farm Tractors Technical Specifications |
