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Kubota B1620 Troubleshooting

The Kubota B1620 is a 2WD or 4WD compact utility tractor. This model was manufactured between 2009 and 2017. The Kubota B1620 tractor is powered by 43.9 cu.in (0.72 L) Kubota D722 4-cycle vertical 3-cylinder water-cooled diesel engine with a rated power of 13.9 hp (10.3 kW) at 2800 rpm. The tractor is fitted with a gear shift transmission with 6 forward and 2 reverse gears. The maximum forward speed - 11.9 mph (19 km/h), maximum reverse speed - 4.4 mph (7 km/h).

The open center hydraulic system has a gear pump with a rated capacity of 3.7 gal/min (14.1 l/min). The hydraulic system pressure is 120 bar (1740 psi). The Kubota B1620 is equipped with a manual steering system, wet disc brakes, 5.0x12 front tyres, and 8.0x16 rear tyres. The wheelbase is 50.2 inches (1270 mm). The tractor is compatible with Kubota LA213 front-end loader with a lift capacity to full height of 665 lbs (302 kg) and breakout force of 1472 (668 kg).

Engine Troubleshooting
Engine hard starting or not starting
Fuel filter clogging - Clean or change the filter
Fuel shut-off valve closed - Open the fuel shut-off valve
Air in fuel pipes - Bleed fuel pipes
Faulty or dirty injectors - Clean or replace fuel injectors
Fuel injection pump is not working correctly - Change or repair the pump
Low engine compression - Inspect cylinder block and replace worn components
Engine stops running unexpectedly
Engine is not warmed up to required temperature - Warm up engine as required
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Irregular fuel injection - Adjust fuel injection timing
Clogged fuel filter element - Service or replace the filter
Dirty or faulty injectors - Clean or replace fuel injectors
Engine starts and then stalls
Incorrectly set fuel injection pump timing - Check and correct settings
Fuel filter plugging - Service the filter
Fuel injector nozzles are dirty or defective - Install a new set of well-balanced nozzles
Fuel injection pump is broken - Rebuild or change fuel pump
Air cleaner element is clogged - Service or replace the air cleaner
Engine stalling at idle
Too low idle RPM - Adjust low idle speed
Fuel injection pump damage - Rebuild or replace pump
Clogged or damaged injector nozzles - Check and change nozzles as required
The valve clearance is not adjusted - Check and adjust as required
Engine overheats
Lack of coolant in cooling system - Top up coolant fluid. Check for leaks or other malfunctions
Cooling system is dirty or cooling parts are failed - Flush cooling system or replace faulty parts
Engine oil level is insufficient - Fill the crankcase with engine oil
Fan belt is damaged or belt tension is incorrect - Adjust belt tension correctly or replace it
Thermostat failure - Replace the thermostat
Engine power is reduced
Dirty or faulty injectors - Check fuel injectors and replace if required
Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly
Clogged air filter - Service or change air filter
Plugged engine oil filter - Service or replace engine oil filter
Engine overload - Reduce the load or operate the tractor in lower gears
Valve clearance is wrong - Correct valve clearance
Low idle speed adjustment is incorrect - Adjust as required
Restricted fuel hoses or pipes - Clean fuel system pipes and hoses
Engine compression too low: Leaking or broken valves - Have valves replaced
Engine knocking or noise
Incorrect setting of fuel injection pump timing - Adjust the fuel injection pump timing correctly
Fuel injector nozzles are damaged - Change or clean injector nozzles
Lack of engine oil - Fill up the engine oil
Low coolant temperature - Normalize the engine temperature
Crankshaft or main bearings failure - Need to install new components
Defective or broken piston rings - Replace the piston rings as required
Flywheel mounting screws are loose - Tighten the screws
Diesel engine using too much oil
Oil leaking: Defective seals or gaskets - Replace defective parts
Incorrect oil viscosity - Use proper viscosity oil
Worn or stuck piston rings - Piston rings need to be replaced
Valve stems or guides are damaged - Install new valves
Worn cylinder liners or pistons - Inspect pistons and liners, change as required

Electrical System Troubleshooting
Battery is not charging
Faulty cell in battery - Replace the battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Battery terminals and cables are corroded or loose - Tighten or clean terminals and cables
Damaged belt or incorrectly adjusted belt tension - Adjust belt tension correctly or replace belt
Starter cranks slowly
Low battery output - Charge the battery
Battery does not hold charge - Service or change the battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Loose or corroded battery cables and terminals - Cables and terminals must be tightened or cleaned
Starter will not work
Low battery voltage - Battery is drained, charge it
Discharged or faulty battery - Recharge or replace battery
Defective starter motor - Change or repair starter
Wiring is improperly connected or disconnected - Need to reconnect the wiring properly

Transmission Troubleshooting
Gears are hard to shift
Worn or incorrectly adjusted clutch - Clutch needs to be replaced or adjusted
Stuck or damaged gear shift linkage - Replace or repair the shift linkage
Damaged or worn shift forks - Shift forks need to be changed
Gearshift mechanism failure - Change or repair failed components
Low transmission fluid pressure
Lack of transmission fluid supply - Fill system with correct transmission fluid level
Plugged transmission fluid filter (if equipped) - Change or clean the transmission fluid filter
Faulty relief valve - Install a new relief valve
Transmission makes noise
Bearings are worn or cracked - Change faulty bearings
Fluid level is low - Check transmission fluid level and add it as required
Contaminated transmission fluid - Fill up with fresh transmission fluid
Damaged gears or improper backlash - Change damaged gears or adjust backlash properly
Worn or damaged shift forks - Install new shift forks
External fluid leaks
Gaskets or seals are defective Replace worn seal or gaskets
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is overheated
The system pressure has not been corrected - Make the correct settings
Defective or misadjusted main relief valve - Adjust or replace the relief valve
Contaminated hydraulic oil - Change hydraulic oil
Air leaks in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Low hydraulic oil pressure
Hydraulic fluid level is insufficient - Check and refill the hydraulic fluid
Hydraulic fluid filter element clogging - Replace hydraulic filter element or service if necessary
Hydraulic pump malfunction - Check hydraulic pump flow and replace pump if necessary
Defective or not adjusted hydraulic control valve - Replace or adjust correctly
Faulty hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Leakage in hydraulic pipes - Detect leaks in hydraulic system and repair it
3-point hitch does not raise or raises very slowly
Hydraulic fluid level is low - Add fluid to the hydraulic system
Hydraulic fluid is too cold - Allow fluid to warm
Hydraulic oil filter element is dirty - Change hydraulic filter element or clean if necessary
Hydraulic pump failure - Check hydraulic pump flow and replace pump if necessary
Faulty or incorrectly adjusted main relief valve - Adjust or change relief valve
Damaged or incorrect adjusted hydraulic control valve - Set properly or replace
Faulty hydraulic cylinder - Check the hydraulic cylinder components for damage or wear and change if necessary
Suction pipe is damaged or loose - Repair or change
Hitch drops too slowly or can't drop
Defective or not adjusted hydraulic control valve - Adjust properly or change
Faulty hydraulic cylinder - Check the hydraulic cylinder components for damage or wear and change if necessary
Worn hitch rock shaft - Change the shaft
Hitch has mechanical defects - Replace defective or worn hitch parts
Hitch jerks when lift or lower
Air in hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic oil is dirty - Hydraulic oil change required
Hydraulic pump is defective - Check pump flow and change pump if necessary
Hydraulic spool valve block is faulty or out of adjustment - Change or adjust properly
Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required



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