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Kubota L260 Troubleshooting
The
Kubota L260 is a 2WD compact utility tractor. This model was manufactured from
1970 to 1976. The Kubota L260 tractor is equipped with Kubota Z1300 vertical
4-stroke 2-cylinder diesel engine.
A 77.7 cubic inches (1.3 L) engine has a cylinder bore of 3.57" (90 mm),
piston stroke of 3.97" (100 mm), rated power of 26 hp (19.4 kW), and
maximum torque of 79.7 hp (58.8 lb-ft) at 1600 rpm. The mechanical
transmission includes a dry single-plate clutch and sliding mesh gearbox
with 8 forward and 2 revers gears.
Max. forward speed - 8.8 mph (14.1 km/h), maximum reverse speed - 5.6
mph (9 km/h). The open center hydraulic system used a gear pump with a
flow of 2.9 gallons per minute (10.7 liters per minute). The hydraulic
system pressure is 138 bar (1990 psi). The Kubota L260 was equipped with
a manual steering system, differential mechanical expanding shoe brakes,
5.00x15 front tires, and 11.2x24 rear tires. The wheel base is 59" (1490
mm).
| Engine Troubleshooting |
| Engine will not start or difficult to start |
| Dirty fuel filter element - Service or replace the filter |
| No fuel supply from the tank - Open the fuel supply valve |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Fuel injectors are defective or dirty - Service or change fuel injectors |
| Fuel injection pump malfunction - Replacement or repair required |
| Poor engine compression - Check and replace worn parts |
| Diesel stalls while running |
| Engine has not warmed up to recommended temperature - Warm up engine as required |
| Air in fuel lines - Bleed fuel lines |
| Fuel injection failed - Use correct settings |
| Plugged fuel filter - Clean or replace the filter |
| Faulty or dirty injectors - Clean or replace fuel injectors |
| Diesel starts and immediately stops |
| Timing of fuel injection pump is wrong - Check the fuel injection pump timing setting |
| Plugged fuel filter - Clean the filter or install new filter element |
| Fuel injector nozzles are damaged - Install new set of properly balanced nozzles |
| Fuel injection pump is not working correctly - Rebuild or change fuel pump |
| Dirty air cleaner - Replace or clean the air cleaner element |
| Low idle speed adjustment is incorrect - Normalize low idle speed |
| Fuel injection pump malfunctioning - Change pump or rebuild it |
| Faulty fuel injector nozzles - Change injector nozzles |
| The valve clearance is not adjusted - Adjust to proper valve clearance |
| Insufficient coolant fluid - Top up coolant fluid. Check for coolant leaks |
| Cooling system is clogged or cooling parts are worn - Replace faulty parts or service cooling system |
| Engine oil level low - Check and refill engine oil |
| Worn fan belt or improper belt tension - Replace or adjust belt tension properly |
| Thermostat fault - Install new thermostat |
| Diesel engine loses power |
| Fuel injectors are defective or dirty - Change fuel injectors |
| Fuel injection pressure is wrong - Adjust pressure to proper level |
| Air filter is clogged - Change or replace air filter element |
| Dirty oil filter - Service or replace engine oil filter |
| Diesel engine overloaded - Reduce load on the engine |
| Incorrect valve clearance - Adjust valve clearance |
| Incorrectly set low idle speed - Correct the settings |
| Fuel pipes or hoses are dirty - Clean fuel system hoses and pipes |
| Insufficient engine compression: Inlet or outlet valves are defective - Valve replacement required |
| Timing of fuel injection pump is wrong - Adjust injection timing |
| Fuel injector nozzles are damaged or dirty - Change or clean injector nozzles |
| Insufficient engine oil - Fill up the engine oil |
| Engine is not preheated - Normalize the temperature by warming up the engine |
| Crankshaft or main bearings wear - Replace crankshaft or bearings |
| Broken or defective piston rings - Have piston rings replaced |
| Flywheel mounting screws are loose - Tighten the screws |
| Diesel engine using too much oil |
| Oil leaks: Defective seals or gaskets - Install new components |
| Wrong oil viscosity - Fill up with the proper oil viscosity |
| Piston rings are stuck or broken - Replace piston rings |
| Valve guides and stems are worn - Change the valves |
| Scored pistons or cylinder liners - Check liners and pistons, replace as required |
| Electrical System Troubleshooting |
| Battery will not charge |
| Bad cell in battery - Battery change required |
| Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair |
| Corroded or loose terminals and cables - Tighten or service terminals and cables |
| Belt wear or improper belt tension adjustment - Adjust belt tension correctly or change belt |
| Low battery voltage - Recharge the battery |
| Battery will not hold charge - Battery needs service or replacement |
| Damaged battery wiring harness - Inspect wiring for damage, replace or repair |
| Battery terminals and cables are loose or corroded - Terminals and cables need to be tightened or cleaned |
| Low battery capacity - Battery is drained, charge it |
| Drained or defective battery - Recharge or change battery |
| Starter motor is defective - Starter needs to be changed |
| Wiring is improperly connected or disconnected - Need to reconnect the wiring properly |
| Transmission Troubleshooting |
| Hard shifting |
| Clutch is not adjusted or faulty - Adjust clutch or change if necessary |
| Gear shift linkage is stuck or worn - Replace or repair the shift linkage |
| Shift forks are worn or damaged - Change defective shift forks |
| Gearshift mechanism is worn out - Repair or replace worn components if required |
| Insufficient transmission fluid pressure |
| Lack of transmission fluid supply - Add transmission fluid as required |
| Plugged transmission fluid filter (if equipped) - Clean or replace the transmission fluid filter |
| Relief valve is faulty - Replace relief valve |
| Broken or worn bearings - Faulty bearings should be replaced |
| Lack of transmission fluid supply - Fill system with correct transmission fluid level |
| Contaminated transmission fluid - Fill up with fresh transmission fluid |
| Incorrect backlash or gears are defective - Replace gears or set backlash correctly |
| Shift forks are worn or damaged - Install new shift forks |
| Gaskets or seals are damaged - Change defective seal or gaskets |
| Transmission housing is cracked - Replace housing or transmission assembly |
| Hydraulics Troubleshooting |
| Hydraulic system is overheated |
| Improper hydraulic system pressure setting - Set the pressure properly |
| Main relief valve malfunction or incorrect adjustment - Adjust or replace the relief valve |
| Hydraulic fluid is contaminated - Fill up with new hydraulic fluid |
| Aeration in hydraulic system - Check the suction line, pump seals, and fittings |
| Low hydraulic oil pressure |
| Not enough hydraulic fluid in the system - Fill the hydraulic system with oil |
| Hydraulic fluid filter clogging - Clean or replace the hydraulic filter |
| Hydraulic pump is faulty - Check the pump capacity and replace pump if required |
| Hydraulic spool valve is faulty or out of adjustment - Replace or set properly |
| Hydraulic cylinder is faulty - Check cylinder parts for wear or damage and replace if necessary |
| Hydraulic piping leaks - Detect leaks in the system and fix it |
| Hitch cannot be lifted or lifting is too slow |
| Lack of hydraulic fluid - Need to add fluid |
| Cold fluid in hydraulic system - Wait for fluid to warm up |
| Dirty hydraulic oil filter - Replace hydraulic filter element or service if necessary |
| Damaged hydraulic oil pump - Flow-rate pump and change pump if necessary |
| Main relief valve is damaged or adjusted improperly - Adjust relief valve or change if required |
| Hydraulic control valve block is faulty or out of adjustment - Change or set correctly |
| Hydraulic cylinder is faulty - Check cylinder parts for wear or damage and replace if necessary |
| Damaged or loose suction line - Tighten or change |
| 3-point hitch lowers slowly or won't lower |
| Damaged or incorrect adjusted hydraulic spool valve - Set properly or replace |
| Hydraulic cylinder malfunction - Check cylinder parts for wear or damage and replace if necessary |
| Damaged lift arm shaft - Replace the shaft |
| The hitch is defective if there is internal mechanical damage - Change worn or damaged hitch parts |
| Hitch lowering or lifting is not smoothly |
| Air enters in hydraulic system - Check the pump seals, suction line, and fittings |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Defective hydraulic pump - Test pump performance and replace pump if necessary |
| Hydraulic control valve is faulty or out of adjustment - Set correctly or replace |
| Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required |
| Steering System Troubleshooting |
| Hard Steering |
| Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts |
| Steering gearbox components are worn - Replace defective components of steering gearbox |
| Faulty drag link or tie rod - Replace or repair |
| Insufficient lubrication in steering box - Need to lubricate the gearbox |
| Not adjusted toe-in alignment - Check and adjust toe-in |
| Tires are not correctly inflated - Inflate tires as necessary |
| Excessive steering wheel free play |
| Steering column bearing or shaft is worn - Change faulty parts |
| Steering linkage assembly is worn or loose - Repair or replace steering linkage |
| Worn steering gearbox bearings - Replace the bearings |
| Front wheel hub bearings or steering knuckles are worn - Change hub bearings or knuckles |
| Damaged or worn steering tie-rod ends - Change faulty part |
| Tractor pulls to right or left |
| Worn or loose steering linkage assembly - Repair or replace steering linkage |
| Defective steering knuckle bushing - Replace knuckle bushing |
| Uneven tire pressure - Inflate the tires properly |
| Toe-in adjustment is incorrect - Adjust toe-in correctly |
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| Farm Tractors Technical Specifications |
