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Kubota L2650 Troubleshooting
The
Kubota L2650 is a L50 series compact utility tractor. This model was
manufactured between 1990 and 1993. The Kubota L2650 tractor is powered by
Kubota D1402 vertical three-cylinder water-cooled diesel engine.
A 85.2 cubic inches (1.4 L) engine has a cylinder bore of 3.25" (85 mm),
piston stroke of 3.23" (82.4 mm), and rated power of 28.5 hp (21.3 kW).
The Kubota L2650 is fitted with two types of transmission. 1st type: 8x8
mechanical shuttle transmission. 2nd type: Glide shift transmission with
8 forward and 8 reverse gears. Max. travel speed (forward and reverse):
13.3 mph (21.4 kph).
The open center hydraulic system includes a gear pump with a rated fluid
flow of 8.2 gpm (31 lpm). The hydraulic system pressure is 2500 psi (172
bar). The Kubota L2650 was equipped with a power steering system, wet
disc brakes, 4.00-15 (2WD) or 7.00-16 (4WD) front tires, and 11.2-24
rear tires. The wheelbase is 64.6 inches (1640 mm).
| Engine Troubleshooting |
| Engine will not start or difficult to start |
| Fuel filter clogging - Install new filter element |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Air in fuel lines - Bleed fuel lines |
| Dirty or faulty injectors - Service or change fuel injectors |
| Fuel injection pump is defective - Repair or install a new fuel pump |
| Low compression - Check and change damaged parts |
| Engine stalls during operation |
| Engine is cold - Warm up the engine |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Bad fuel injection - Check and adjust |
| Fuel filter is dirty - Replace filter element |
| Fuel injectors are defective or dirty - Check fuel injectors and replace if required |
| Diesel starts and stalls suddenly |
| Timing of fuel injection pump is wrong - Correct injection timing |
| Fuel filter plugging - Change the filter element |
| Fuel injector nozzles are defective or dirty - Install a new set of well-balanced nozzles |
| Fuel injection pump is not working correctly - Replace or repair injection pump |
| Air cleaner is clogged - Change or service air cleaner element |
| Engine stops while idling |
| Improperly adjusted low idle speed - Adjust the low idle speed |
| Fuel injection pump is broken - Replacement or repair required |
| Clogged or damaged injector nozzles - Check and change nozzles as required |
| The valve clearance is not adjusted - Adjust valve clearance |
| Low coolant level - Coolant needs to be refilled. Check for leaks or other malfunctions |
| Cooling system parts are defective or system is dirty - Replace faulty parts or flush the cooling system |
| Low engine oil level - Fill up the oil to required level |
| Fan belt tension is not adjusted or belt is broken - Replace or adjust belt tension properly |
| Defective thermostat - Install new thermostat |
| Engine power is insufficient |
| Faulty or dirty injectors - Clean or replace fuel injectors |
| Incorrect fuel injection pressure - Test fuel injection pressure and adjust it correctly |
| Dirty air filter - Change or replace air filter element |
| Oil filter element clogged - Service or replace engine oil filter |
| Engine is under excessive load - Load reducing is recommended |
| Excessive valve clearance - Adjustment procedure required |
| Wrong adjustment of low idle speed - Test and adjust |
| Restricted fuel hoses or pipes - Service fuel pipes and hoses |
| Lack of compression: Leaking or broken valves - Replace the valves as required |
| Engine knocking sound or abnormal noise |
| Fuel injection pump timing is incorrect - Check the fuel injection pump timing setting |
| Fuel injector nozzles are dirty - Service or replace injector nozzles |
| Engine oil insufficient - Fill up the engine oil |
| Engine is not fully warmed up - Normalize the temperature by warming up the engine |
| Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced |
| Piston rings are defective or broken - Piston rings replacement required |
| Loose flywheel screws - Check the flywheel screws and tighten as required |
| Engine oil consumption is too high |
| Oil leakage: Gaskets or seals may be damaged - Worn parts need to be replaced |
| Incorrect oil viscosity - Use correct viscosity oil |
| Piston rings are defective or worn - Change piston rings |
| Worn valve guides and valve stems - Install new valves |
| Cylinder liners or pistons are worn - Inspect pistons and liners, replace as required |
| Electrical System Troubleshooting |
| Battery will not charge |
| Battery failing - Install a new battery |
| Damaged battery wiring harness - Inspect wiring for damage, replace or repair |
| Corroded or loose cables and terminals - Clean or tighten cables and terminals |
| Belt wear or improper belt tension adjustment - Adjust belt tension correctly or change belt |
| Low battery output voltage - Recharge the battery |
| Battery drains quickly - Service charging system or install new battery |
| Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair |
| Corroded or loose battery terminals and cables - Cables and terminals must be tightened or cleaned |
| Low battery output - Battery needs to be recharged |
| 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 |
| Worn or misadjusted clutch - Adjust or install new clutch |
| Gear shift linkage is stuck or worn - Change or repair shift linkage |
| Bent or worn shift forks - Install new shift forks |
| Faulty gear shifting mechanism - Faulty parts must be changed |
| Lack of transmission oil pressure |
| Fluid level is low - Add transmission fluid as required |
| Clogged transmission fluid filter element (if fitted) - Change or clean the transmission fluid filter |
| Faulty relief valve - Replace valve as required |
| Damaged or worn bearings - Change faulty bearings |
| Oil level is low - Add transmission oil as required |
| Dirty transmission oil - Transmission oil must be changed |
| Damaged gears or improper backlash - Set backlash correctly or change the gears |
| Worn or damaged shift forks - Change the shift forks |
| Transmission fluid leakage |
| Seals or gaskets are damaged - Install new seal or gaskets |
| Transmission housing is cracked - Replace housing or transmission assembly |
| Hydraulics Troubleshooting |
| Hydraulic system is too hot |
| Improper pressure in hydraulic system - Adjust properly |
| Main relief valve incorrect adjustment or failure - Replace or set up the relief valve |
| Hydraulic oil is contaminated - Fill up with fresh hydraulic oil |
| Air enters in hydraulic system - Check the pump seals, suction pipe, and fittings |
| Low hydraulic fluid pressure |
| Hydraulic fluid level is insufficient - Add fluid to the hydraulic system |
| Hydraulic fluid filter clogging - Service or replace the hydraulic filter |
| Hydraulic pump is faulty - Test the pump performance and change pump if required |
| Hydraulic control valve is faulty or out of adjustment - Replace or adjust properly |
| Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Leakage in hydraulic pipes - Inspect hydraulic system for leaks and repair it |
| Hitch cannot be lifted or lifting is too slow |
| Hydraulic fluid level is low - Fill the hydraulic system with oil |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic fluid filter is dirty - Service the hydraulic filter or change if required |
| Hydraulic pump not working - Check pump flow and install new pump if necessary |
| Faulty or incorrectly adjusted main relief valve - Replace or set up the relief valve |
| Hydraulic spool valve block is not set properly or defective - Change or adjust properly |
| Hydraulic cylinder is defective - Inspect cylinder components for damage or wear and change if required |
| Broken or loose suction line - Retighten or change |
| Hitch drops too slowly or can't drop |
| Hydraulic spool valve block is not set properly or defective - Replace or set correctly |
| Hydraulic cylinder failure - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Worn hitch cross shaft - Replace the shaft |
| The hitch has any internal mechanical damage - Change worn or damaged hitch parts |
| Jerky lifting or lowering of 3-point hitch |
| Aeration in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Hydraulic fluid contamination - Change hydraulic fluid |
| Hydraulic pump failure - Check pump flow and install new pump if necessary |
| Hydraulic control valve block is not set properly or defective - Adjust correctly or change |
| Hydraulic cylinder malfunction - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Steering System Troubleshooting |
| Steering wheel turns hard |
| Steering column is broken or incorrectly fitted - Steering column needs to be refit correctly or replaced |
| Air trapped in the steering system - Bleed air from system |
| Toe-in adjustment is incorrect - Adjust toe-in correctly |
| Tire pressure is improper - Inflate the tires properly |
| Damaged hydraulic steering pump - Steering pump needs to be repaired or replaced |
| Worn or damaged hydrostatic steering unit - Replace or repair steering unit as required |
| Relief valve is stuck or worn - Flush relief valve or change if necessary |
| Insufficient steering fluid - Fill up the steering fluid |
| Steering system oil leakage - Retighten steering pipe and hose connections |
| Excessive play in steering |
| Worn steering column shaft or coupling - Change faulty component |
| Hydrostatic steering unit is worn or defective - Repair or replace the steering unit |
| Steering pump malfunction - Steering pump needs to be repaired or replaced |
| Steering linkage or tie-rod ends are defective - Replace failed component |
| Front wheels wander to right or left |
| Tires are deflated - Need to inflate tires |
| Incorrect toe-in - Check and adjust toe-in |
| Steering tie-rod ends or linkage are worn - Replace damaged part |
| Faulty or worn hydrostatic steering unit - Check and replace as required |
| Faulty steering cylinder - Repair or replace steering cylinder |
| Damaged or improperly adjusted or worn front hub bearings - Install new bearings or adjust it correctly |
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| Farm Tractors Technical Specifications |
