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Kubota L3430 Troubleshooting

The Kubota L3430 is a L30-series compact utility tractor. This model was manufactured between 2003 and 2007. The tractor was designed in 3 versions: L3430DT (4WD, 8-speed), L3430HST (Hydro), and L3430HSTC (Cab, hydro).

The Kubota L3430 driveline consists of a 100.5 cu.in (1.65 L) Kubota D1703 three-cylinder indirect injection diesel engine and 8x8 Sync Shuttle fully synchronized transmission (FST), or 3-range hydrostatic transmission with infinite forward and reverse gears. The engine has a cylinder bore of 3.4" (87 mm), piston stroke of 3.6" (92.4 mm), and rated power of 33.6 hp (25.1 kW).

Max. travel speed (forward/reverse): 19.2 mph (31 km/h) and 16 mph (25.8 km/h). The open center hydraulic system includes a gear pump with fluid flow rate of 8.3 gallons per minute (31.5 liters per minute). The hydraulic system pressure is 177 bar (2560 psi). The Kubota L3430 is equipped with a hydrostatic power steering, wet disc brakes, 7.00x16 front tires, and 12.4x24 rear tires. The wheel base is 71.1" (1805 mm).

The tractor is compatible with the following attachments: Kubota LA723 loader with 72" (1820 mm) bucket and max lift height of 102.4" (2600 mm), or Kubota LA513 loader with 66" (1670 mm) bucket and max lift height of 96.5" (2450 mm).

Engine Troubleshooting
Engine won't start or starts hard
Dirty fuel filter element - Service the filter
The fuel shut-off valve is closed - Open fuel shut-off valve
There is air in the fuel system - Bleed the system
Faulty or dirty injectors - Service or change fuel injectors
Fuel injection pump is not working correctly - Change or repair the pump
Low engine compression - Check and replace worn parts
Engine stops during operation
Engine not warmed up - Warm up the engine
There is air in the fuel system - Bleed the system
Bad fuel injection - Check and adjust
Fuel filter is dirty - Change the filter element
Fuel injectors are clogged or faulty - Check fuel injectors and replace if required
Engine starts and then stalls
Incorrect setting of fuel injection pump timing - Adjust the fuel injection pump timing correctly
Fuel filter clogging - Clean the filter element
Fuel injector nozzles are faulty - Change injector nozzles
Defective fuel injection pump - Rebuild or install a new injection pump
Air cleaner is dirty - Replace or clean the air cleaner element
Engine stops at idle
Wrong adjustment of low idle speed - Normalize low idle speed
Fuel injection pump is not operating properly - Install a new pump or rebuild
Clogged or damaged injector nozzles - Install a new set of well-balanced nozzles
Improper valve clearance - Need to adjust valve clearance
Engine is overheated
Insufficient coolant fluid - Top up coolant fluid. Inspect the system for leaks
Cooling system components are damaged or system is dirty - Change faulty components or service cooling system
Lack of engine oil - Need to add engine oil
Fan belt is broken or belt tension is unadjusted - Adjust correctly or install new belt
Defective thermostat - Check and replace if required
Lack of engine power
Fuel injectors are damaged or dirty - Check fuel injectors and replace if required
Incorrect fuel injection pressure - Correct the pressure settings
Dirty air filter element - Service or replace the air filter
Clogged oil filter - Clean or replace engine oil filter element
Diesel engine is overloaded - Reduce load on the engine
Valve clearance is wrong - Adjust valve clearance
Incorrect low idle setting - Correct the settings
Dirt in the fuel pipes or hoses - Service fuel pipes and hoses
Poor engine compression: Valves are broken or leaking - Install new valves
Engine knocks or noises
Incorrect setting of fuel injection pump timing - Check and correct adjustments
Fuel injector nozzles are dirty - Service or replace nozzles if required
Engine oil level is insufficient - Add oil to the engine crankcase
Low coolant temperature - Warm up the engine as required
Main bearings or crankshaft are worn out - Change defective components as required
Broken or worn piston rings - Piston rings replacement required
Loose flywheel screws - Check the flywheel screws and tighten as required
Excessive engine oil consumption
Oil leaking: Defective seals or gaskets - New components need to be installed
Incorrect oil viscosity - Use oil of correct viscosity
Damaged or seized piston rings - Have piston rings replaced
Valve guides and stems are worn - Valves must be replaced
Damaged cylinder liners or pistons - Inspect liners and pistons, fit new parts as necessary

Electrical System Troubleshooting
Battery cannot be charged
Defective battery - Battery change required
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose cables and terminals - Cables and terminals must be tightened or cleaned
Defective belt or improperly adjusted belt tension - Replace belt or properly adjust belt tension
Starter turning slow
Low battery output - Battery needs to be recharged
Battery is draining quickly - Service or change the battery
Damaged battery wiring harness - Inspect wiring for damage, replace or repair
Battery cables and terminals are corroded or loose - Tighten or clean cables and terminals
Starter will not work
Low battery output voltage - Recharge the battery
Drained or faulty battery - Need to charge or replace the battery
Starter motor is defective - Starter needs to be changed
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Gear shift is hard
Incorrectly adjusted or damaged clutch - Adjust correctly or replace
Gear shift linkage is stuck or worn - Service or change the shift linkage
Shift forks are worn or damaged - Replace defective shift forks
Gear shifting mechanism is worn - Change worn components
Transmission oil pressure is insufficient
Insufficient fluid supply - Fill the transmission housing with fluid
Transmission fluid filter clogging (if fitted) - Clean or replace the transmission fluid filter
Damaged relief valve - Replace the valve
Transmission noises
Bearings are worn or damaged - Replace faulty bearings
Insufficient oil supply - Checking transmission oil level and add if necessary
Contaminated transmission fluid - Transmission fluid must be changed
Defective gears or incorrect backlash - Replace gears or adjust backlash properly
Shift forks are damaged or worn - Change the shift forks
External fluid leaks
Worn gaskets or seals - Seals and gaskets replacement required
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system overheated
Hydraulic system pressure is not adjusted correctly - Correct adjustment is required
Main relief valve is defective or unadjusted - Adjust or change relief valve
Dirty hydraulic fluid - The fluid must be changed
Air enters in hydraulic system - Check the suction line, pump seals, and fittings
Low hydraulic system pressure
Hydraulic oil level is low - Check oil level and add hydraulic oil as required
Hydraulic oil filter clogging - Clean or change hydraulic filter
Faulty hydraulic oil pump - Test the pump flow rate and install new pump if required
Defective or incorrect setting hydraulic spool valve block - Adjust correctly or change
Hydraulic cylinder is not working - Check cylinder parts for wear or damage and replace if necessary
Hydraulic piping leaks - Identify leaks in the system and repair it
3-point hitch lifts too slowly or can't lift
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Cold hydraulic fluid - Warm up the fluid
Hydraulic fluid filter is dirty - Replace hydraulic filter element or service if necessary
Defective hydraulic pump - Check pump performance and change it if necessary
Main relief valve is damaged or adjusted improperly - Adjust relief valve or change if required
Hydraulic spool valve block is not set properly or defective - Change or set correctly
Hydraulic cylinder failure - Check cylinder parts for wear or damage and replace if necessary
Suction pipe is damaged or loose - Repair or change
Hitch can't drop or drops too slowly
Hydraulic spool valve block is not set properly or defective - Replace or adjust correctly
Hydraulic cylinder is defective - Inspect cylinder components for damage or wear and change if required
Lift arm shaft is worn - Change the shaft
Internal mechanical failure of the hitch - Change worn or defective hitch components
Hitch jerks when drop or lift
Air in hydraulic system - Inspect the pump seals, suction line, and fittings
Dirty hydraulic fluid - The fluid must be changed
Damaged hydraulic oil pump - Test the pump performance and change pump if required
Damaged or incorrect adjusted hydraulic spool valve - Replace or set properly
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary

Steering System Troubleshooting
Hard Steering
Steering column is defective or incorrectly installed - Steering column must be installed correctly or replaced
Aeration in steering system - Bleed air from system
Incorrect toe-in adjustment - Adjust toe-in correctly
Tires are deflated - Need to inflate tires
Steering pump is worn - Check the steering pump and replace if necessary
Worn or defective hydrostatic steering unit - Inspect and change as required
Relief valve is stuck or faulty - Install a new relief valve or clean it
Steering fluid level is insufficient - Add oil to steering system
Steering system oil leakage - Retighten steering hose and pipe connections
Steering wheel has too much free-play
Steering column coupling or shaft is worn - Change faulty component
Hydrostatic steering unit has wear or malfunction - Change or repair steering unit if required
Damaged hydraulic steering pump - Replace or repair steering pump
Steering linkage or tie-rod ends are defective - Change failed part
Tractor pulls to left or right
Tire pressure is not correct - Check tire pressure and inflate as required
Not adjusted toe-in - Check toe-in and correct
Steering tie-rod ends or linkage are worn - Change failed part
Hydrostatic steering unit is defective or worn - Repair or replace the steering unit
Faulty steering cylinder - Repair or change hydraulic steering cylinder
Front hub bearings are defective or improperly adjusted - Adjust correctly or replace bearings



Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294