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Kubota B2420 Troubleshooting
The
Kubota B2420 is a 2WD or 4WD compact tractor. This model was manufactured from
2009 to 2017.
The Kubota B2420 driveline includes a Kubota D1105 E-TVCS 4 cycle
vertical 3-cilinder water-cooled diesel engine and gear shift
transmission with 9 forward and 3 reverse gears. A 68.6 cubic inches
engine has a cylinder bore of 3.07" (78 mm), piston stroke of 3.09"
(78.4 mm), and rated power of 21.3 hp (15.8 kW) at 2600 rpm. Max.
forward speed - 12.1 mph (19.4 km/h), maximum reverse speed - 8.4 mph
(13.5 km/h).
The open center hydraulic system includes a gear pump with a flow rate
of 6.9 gpm (26.4 lpm). The hydraulic pressure is 132 bar (1920 psi). The
Kubota B2420 is equipped with an integrated power steering system, wet
multi disc brakes, 7.00x12 front tires, and 9.50x18 rear tires. The
wheelbase is 61.8 inches (1563 mm).
| Engine Troubleshooting |
| Diesel won't start or hard to start |
| Clogged fuel filter element - Service or replace the filter |
| No fuel supply from the tank - Open the fuel supply valve |
| Air in fuel system - Air-bleed fuel system |
| Dirty or damaged injectors - Check fuel injectors and replace if required |
| Faulty fuel injection pump - Replace injection pump or repair it |
| Engine has low compression - Check cylinder block and change faulty parts |
| Engine shuts off unexpectedly while running |
| Low coolant temperature - Warm up the engine |
| Air in fuel system - Air-bleed fuel system |
| Fuel injection failed - Use correct settings |
| Fuel filter is clogged - Service or replace the filter |
| Dirty or faulty injectors - Service or change fuel injectors |
| Engine starts and immediately stalls |
| Incorrectly set fuel injection pump timing - Check the fuel injection pump timing setting |
| Dirty fuel filter element - Change the filter element |
| Fuel injector nozzles are faulty - Install a new set of well-balanced nozzles |
| Fuel injection pump malfunctioning - Repair or install new pump |
| Dirty air cleaner - Replace cleaner or install new cleaner element |
| Improperly adjusted low idle speed - Correct the settings |
| Fuel injection pump damage - Rebuild or install a new injection pump |
| Damaged or clogged injector nozzles - Change injector nozzles |
| Valve clearance is out of adjustment - Adjust valve clearance |
| Lack of coolant in cooling system - Coolant needs to be refilled. Check for coolant leaks |
| Cooling system parts are defective or system is clogged - Replace faulty parts or service cooling system |
| Engine oil insufficient - Checking oil level and add if necessary |
| Unadjusted fan belt tension or worn belt - Adjust properly or replace the belt |
| Thermostat fault - Thermostat needs to be replaced |
| Dirty or faulty injectors - Change fuel injectors |
| Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary |
| Dirty air filter element - Service or replace the air filter |
| Dirty oil filter - Service or replace engine oil filter |
| Diesel engine overloaded - Change to lower gear or reduce load |
| Improper valve clearance - Adjustment procedure required |
| Low idle speed adjustment is incorrect - Adjust as required |
| Fuel pipes or hoses are clogged - Service fuel hoses and pipes |
| Engine compression too low: Valves are faulty or leaking - Replace the valves |
| Incorrect setting of fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected |
| Fuel injector nozzles are damaged or dirty - Service or replace nozzles if required |
| Engine oil insufficient - Need to add engine oil |
| Engine is not preheated - Warm up the engine to required temperature |
| Worn crankshaft or main bearings - Replace crankshaft or bearings |
| Piston rings are worn or broken - Replace the piston rings as required |
| Flywheel bolts are loose - Bolts need to be tightened |
| Excessive engine oil consumption |
| Oil leakage: Seals or gaskets are wearing excessively - Replace to repair leaks |
| Oil viscosity is incorrect - Fill up with the proper oil viscosity |
| Damaged or seized piston rings - Have piston rings replaced |
| Valve stems and guides are worn - Valves must be replaced |
| Pistons or cylinder liners are damaged - Check liners and pistons, install new components as required |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Battery is worn - Use a new battery |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded cables and terminals - Tighten or service cables and terminals |
| Belt wear or improper belt tension adjustment - Change belt or correctly adjust belt tension |
| Battery voltage is low - Low battery charging, charge as required |
| Battery runs out quickly - Service battery or replace it |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Corroded or loose battery terminals and cables - Clean or tighten terminals and cables |
| Battery capacity is low - Recharge the battery |
| Discharged or defective battery - Charge or replace the battery |
| Faulty starter motor - Change or repair starter |
| Improperly connected or disconnected cables - Check battery cables and connect properly |
| Transmission Troubleshooting |
| Hard to shift gears |
| Failure or improper clutch adjustment - Clutch adjustment or replacement required |
| Stuck or damaged gear shift linkage - Change or repair shift linkage |
| Damaged or worn shift forks - Replace the shift forks |
| Gearshift mechanism failure - Change or repair failed components |
| Lack of transmission oil pressure |
| Oil level is insufficient - Fill the transmission housing to proper oil level |
| Plugged transmission fluid filter (if equipped) - Replace or clean transmission fluid filter |
| Relief valve sticking - Install a new relief valve |
| Transmission is excessively noisy |
| Broken or worn bearings - Faulty bearings should be replaced |
| Oil level is insufficient - Fill the transmission housing to proper oil level |
| Dirty transmission fluid - Change transmission fluid |
| Incorrect backlash or gears are defective - Set backlash correctly or change the gears |
| Shift forks are worn or damaged - Install new shift forks |
| Gaskets or seals are damaged - Seals and gaskets need to be replaced |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Hydraulic system is overheated |
| Improper hydraulic system pressure setting - Set the pressure properly |
| Main relief valve incorrect adjustment or failure - Adjust relief valve or change if required |
| Hydraulic oil is dirty - Hydraulic oil change required |
| Air enters in hydraulic system - Check the pump seals, suction line, and fittings |
| Hydraulic oil pressure too low |
| Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required |
| Hydraulic fluid filter is clogged - Replace filter element or clean if required |
| Defective hydraulic pump - Check the pump capacity and replace pump if required |
| Hydraulic control valve block is faulty or out of adjustment - Change or adjust properly |
| Hydraulic cylinder is defective - Inspect cylinder components for wear or damage and change if required |
| Leakage in hydraulic pipes - Find leaks in hydraulic system and repair it |
| 3-point hitch won't raise or raises slowly |
| Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid |
| Cold hydraulic fluid - Warm up the fluid |
| Hydraulic oil filter clogging - Install a new hydraulic filter element |
| Hydraulic pump failure - Check pump capacity and change if necessary |
| Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary |
| Damaged or incorrect adjusted hydraulic control valve - Change or set correctly |
| Hydraulic cylinder is not working - Inspect cylinder components for damage or wear and change if required |
| Disconnected or damaged suction pipe - Connect or replace |
| 3-point hitch won't drop or drops slowly |
| Defective or not adjusted hydraulic spool valve - Change or adjust correctly |
| Hydraulic cylinder failure - Check cylinder components for wear or damage and change if necessary |
| Worn lift arm shaft - Install a new shaft |
| Mechanical components of the hitch are defective - Change faulty or worn hitch parts |
| 3-point hitch lift or lower is jerky |
| Air leaks in hydraulic system - Check the suction pipe, fittings, and pump seals |
| Dirty hydraulic oil - The oil must be changed |
| Hydraulic pump failure - Test pump flow rate and replace pump if required |
| Hydraulic spool valve block is not set properly or defective - Replace or set properly |
| Hydraulic cylinder is defective - Check cylinder components for damage or wear and change if necessary |
| Steering System Troubleshooting |
| Heavy steering |
| Damaged or improperly installed steering column - Reinstall or replace the steering column |
| Aeration in steering system - Bleed air |
| Incorrect toe-in adjustment - Adjust toe-in wheels properly |
| Tire pressure is improper - Inflate the tires properly |
| Steering pump is faulty - Steering pump needs to be replaced or repaired |
| Damaged or worn power steering valve - Repair or replace the steering valve |
| Faulty steering box components - Defective power steering box components must be replaced |
| Low steering oil level - Fill up the steering oil |
| Steering system has oil leaks - Retighten the connections of the hydraulic steering lines and hoses |
| Excessive steering wheel play |
| Steering column shaft or coupling has maximum wear - Change defective part |
| Worn or damaged power steering valve - Change or repair steering valve if required |
| Worn steering box parts - Change defective steering box parts |
| Worn steering pump - Repair or change steering pump |
| Steering tie-rod ends or linkage are worn - Change damaged part |
| Front wheels wander to right or left |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Improper toe-in adjustment - Check toe-in and correct |
| Steering tie-rod ends or linkage are worn - Replace failed part |
| Worn steering box parts - Repair power steering box |
| Power steering valve has wear or damage - Check and replace as required |
| Incorrectly adjusted or damaged front hub bearings - Replace or adjust the bearings correctly |
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| Farm Tractors Technical Specifications |
