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Kubota B1220 Troubleshooting

The 4-wheel drive Kubota B1220 compact utility tractor was manufactured from 2009 to 2018. The Kubota B1220 powertrain system components: a 29.2 cu.in (0.46 L) Kubota Z482 vertical two-cylinder liquid-cooled diesel engine and gear shift transmission with 6 forward and 2 reverse gears. The engine has a cylinder bore of 2.64" (67 mm), piston stroke of 2.68" (68 mm), and rated power of 10.7 hp (7.9 kW).

The maximum travel speed (forward/reverse): 10.6 mph (17 kph) and 6.9 mph (4.3 kph). The open center hydraulic system has a gear pump with a rated capacity of 2.2 gal/min (8.2 l/min). The hydraulic pressure is 89 bar (1290 psi). The Kubota B1220 is equipped with a manual steering system, wet disc brakes, 5.00x12 front tires, and 8.00x16 rear tires.

Engine Troubleshooting
Engine doesn't start or hard to start
Dirty fuel filter element - Filter maintenance required
Closed fuel supply valve - Open supply valve to inject fuel
Air trapped in fuel system - Bleed air
Fuel injectors are clogged or faulty - Inspect fuel injectors and replace if necessary
Fuel injection pump is defective - Replace or rebuild injection pump
Bad cylinder compression - Check cylinder block and change worn components
Engine stops during operation
Low coolant temperature - Normalize the engine temperature
Air in fuel lines - Bleed fuel lines
Improper fuel injection - Fuel injection settings required
Dirty fuel filter element - Service the filter
Clogged fuel injectors - Inspect fuel injectors and replace if necessary
Engine starts and stalls immediately
Fuel injection pump out of timing - Repair or replace fuel injection pump
Fuel filter clogging - Clean or replace the filter
Fuel injector nozzles are damaged or dirty - Replace fuel injector nozzles
Fuel injection pump is damaged - Repair or install new pump
Air cleaner is clogged - Change or replace air cleaner element
Engine stalls while idling
Incorrect low idle speed adjustment - Correct low idle adjustment
Damaged fuel injection pump - Replacement or repair required
Damaged or clogged injector nozzles - Service or replace injector nozzles
Valve out of adjustment - Adjust valve clearance according to specifications
Engine overheating
Not enough coolant - Fill radiator to proper level. Check the components of cooling system
Cooling system parts are failed or system is clogged - Service the cooling system or change faulty parts
Insufficient engine oil - Fill up the engine oil
Worn fan belt or unadjusted belt tension - Adjust correctly or replace the belt
Thermostat malfunction - Thermostat needs to be replaced
Diesel engine is losing power
Fuel injectors are clogged or faulty - Check fuel injectors and replace if required
Fuel injection pressure is incorrect - Adjust to correct pressure
Air filter element clogging - Clean or replace the air filter element
Clogged oil filter element - Replace or service engine oil filter
Diesel engine overloaded - Reduce the load or use a lower gear
Valve clearance is out of adjustment - Check and adjust
Incorrectly adjusted low idle speed - Need to adjust idle speed
Fuel hoses or pipes are clogged - Service fuel pipes and hoses
Low engine compression: Worn or damaged valves - Change the valves
Engine noise or knocking
Fuel injection pump out of timing - Repair or replace fuel injection pump
Fuel injector nozzles fault - Service or replace injector nozzles
Engine oil level is low - Add oil to the engine crankcase
Engine is cold - Warm up engine to required temperature
Worn main bearings or crankshaft - Change defective components as required
Damaged or defective piston rings - Have piston rings replaced
The flywheel to crankshaft bolts are loose - Tighten bolts as required
Engine using too much oil
External oil leaks: Damaged seals or gaskets - Install new components
Wrong oil viscosity - Use correct viscosity oil
Stuck or worn piston rings - Install new piston rings
Damaged valve stems or valve guides - Need to replace the valves
Pistons or cylinder liners are scored - Inspect pistons and liners, fit new components as necessary

Electrical System Troubleshooting
Battery cannot be charged
Faulty cell in battery - Battery replacement required
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Battery cables and terminals are corroded or loose - Clean or tighten terminals and cables
Belt is worn or belt tension is incorrectly adjusted - Adjust belt tension properly or change belt
Starter turns slow
Low battery output voltage - Battery is drained, recharge it
Battery discharges quickly - Service or replace the battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose terminals and cables - Service or tighten battery cables and terminals
Starter motor is not working
Low battery output - Low battery charging, charge as required
Drained or worn battery - Charge or replace the battery
Starter motor is damaged - Repair or change starter
Improperly connected or disconnected wiring harness - Inspect wiring harness and connect properly

Transmission Troubleshooting
Hard shifts
Misadjusted or defective clutch - Clutch needs to be adjusted or changed
Gear shift linkage is stuck or worn - Change or repair shift linkage
Bent or worn shift forks - Change defective shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Low transmission pressure
Low transmission fluid level - Fill up the transmission fluid
Transmission fluid filter is dirty (if equipped) - Replace or clean transmission fluid filter
Faulty relief valve - Change relief valve
Transmission is excessively noisy
Bearings are worn or cracked - Change the bearings
Not enough fluid in transmission - Fill up the transmission fluid
Transmission fluid contamination - Fill up with fresh transmission fluid
Backlash is incorrect or gears are worn - Change the gears or adjust backlash correctly
Bent or worn shift forks - Replace the shift forks
Transmission fluid leaking
Gaskets or seals are damaged - Install new components
Cracked transmission case - Install a new transmission case

Hydraulics Troubleshooting
Hydraulic system overheats
Improper pressure in hydraulic system - Adjust properly
Main relief valve is damaged or adjusted improperly - Set up or change the relief valve
Contaminated hydraulic fluid - Change hydraulic fluid
Air enters in hydraulic system - Inspect the suction line, pump seals, and fittings
Low hydraulic system pressure
Not enough hydraulic fluid in the system - Need to add fluid
Hydraulic oil filter element clogging - Replace hydraulic filter element or service if necessary
Damaged hydraulic oil pump - Check pump capacity and change if necessary
Hydraulic spool valve is not set properly or defective - Change or set correctly
Defective hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Hydraulic lines are leaking - Identify leaks in the system and repair it
Hitch cannot be raised or raising is too slowly
Lack of hydraulic fluid - Fill the hydraulic system with oil
Cold oil in hydraulic system - Wait for oil to warm up
Hydraulic fluid filter element is dirty - Service the hydraulic filter or change if required
Defective hydraulic pump - Flow-rate pump and change pump if necessary
Misadjusted or defective main relief valve - Adjust or replace the relief valve
Faulty or incorrect setting hydraulic spool valve - Change or set correctly
Hydraulic cylinder is defective - Check cylinder parts for wear or damage and replace if necessary
Suction line is damaged or disconnected - Connect or replace
Hitch can't drop or drops too slowly
Defective or not adjusted hydraulic spool valve - Change or adjust properly
Hydraulic cylinder is faulty - Inspect cylinder parts for wear or damage and replace if required
Lift arm shaft is worn - Install a new shaft
Mechanical components of the hitch are defective - Replace faulty or worn hitch components
Hitch is lowered or raised jerkily
Air trapped in the hydraulic system - Inspect the suction line, pump seals, and fittings
Hydraulic oil contamination - Change the oil
Hydraulic pump not working - Test the pump flow rate and change pump if required
Hydraulic spool valve block is defective or set improper - Replace or adjust correctly
Defective hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary



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