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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
