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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
Engine stalls when idle
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
Engine overheating
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
Engine knocks or noises
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
Starter turns slow
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
Starter does not work
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
Transmission noise
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
Transmission oil leaks
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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