Kubota B2320, B2620, B2920 service schedule

Kubota B series · Check your serial plate (not stated in the manual)

Every maker's service job for the Kubota B2320, B2620, B2920, counted in hours, with the oils, filters and parts each one needs. Add your tractor to Farmyard Workshop and it works out what's due from your hours and dates, and keeps the service history.

Track your B2320, B2620, B2920 for free

Versions: B2320 (DT, DTN, HSD, HSDN); B2620 HSD; B2920 HSD

Service intervals

Job	When
Grease all fittings	every 50 hours
Air cleaner: clean and replace	every 100 hours or every year
Fan belt, clutch, brake and battery checks	every 100 hours
Radiator hoses, fuel line and intake hoses	every 200 hours or every 2 years
Engine oil and filter change	every 200 hours
Transmission oil filter (HST models)	every 200 hours
Transmission fluid and hydraulic filter change	every 400 hours
Front axle case oil change (4WD)	every 400 hours
Front axle pivot adjustment (4WD)	every 400 hours
Fuel filter: clean and replace	every 400 hours
Valve clearance, injectors and injection pump (dealer)	every 800 hours
Coolant change and system flush	every 2 years

Service jobs and parts

Grease all fittings

Chassis · every 50 hours

Every 50 hours. The lubricant table lists the speed control pedal (HST), clutch pedal, brake pedal, top link, right-hand lifting rod and the battery terminals (a moderate smear). Pump until grease overflows.

Part	Qty	Notes	Part number
Multipurpose grease	1	NLGI-2 or NLGI-1 grease (GC-LB)	check your handbook

Step-by-step

Wipe the fittings clean.
Pump until clean grease overflows at each point.
Smear a little on the battery terminals.

Tools: Grease gun

Air cleaner: clean and replace

Intake · every 100 hours or every year

The primary element is cleaned every 100 hours (more often in dust) and both elements are replaced every year, or after six cleanings for the primary.

Part	Qty	Notes	Part number
Air cleaner primary element	1	Kubota number for the outer element per FridayParts filter kit 77700-03365 listing; secondary element not found	6C060-99410
Air cleaner secondary element	1	Listing names B2320 and B2620 (not B2920); 32721-58240 is the alternate. Check yours.	32721-58242

Step-by-step

Remove and clean the primary element.
Replace both elements once a year.

Tools: Compressed air (low pressure)

Fan belt, clutch, brake and battery checks

General · every 100 hours

The chart gives 100 hours for fan belt, clutch and brake adjustment, and battery checks.

Step-by-step

Check belt tension and clutch and brake pedal free play.
Check battery condition and fluid.

Tools: Spanners

Radiator hoses, fuel line and intake hoses

Cooling · every 200 hours or every 2 years

Check radiator hoses every 200 hours or six months. Fuel line check is every 100 hours. Replace hoses and clamps every 2 years, or sooner if swollen, hard or cracked.

Step-by-step

Check clamps are tight and hoses are not swollen, hard or cracked.
Replace at two years.

Tools: Screwdriver

Engine oil and filter change

Engine · every 200 hours

The service chart gives 200 hours for both the engine oil and the oil filter, with the first change at 50 hours. If the diesel has more than 0.5 % sulphur, halve the interval. The handbook says use only a Kubota genuine filter.

Part	Qty	Notes	Part number
Engine oil	1	10W-30 or 15W-40. API CF, CF-4, CG-4, CH-4 or CI-4 (not CJ-4). B2320 3.1 L and B2920 3.5 L with filter; for the B2620 the oil-change page and lubricant table differ, so use the dipstick. Aztec Oils match: EMPROTEC SHPD 10W-30	check your handbook
Engine oil filter	1	Kubota genuine only. Check your handbook or dealer for the number	check your handbook

Step-by-step

Drain the oil while the engine is still warm, then refit the drain plug.
Fit the new filter with a film of clean oil on the seal, tighten by hand until it touches, then another half turn.
Fill to the upper notch on the dipstick, run briefly and recheck the level.

Tools: Drain tray (5 L), Filter wrench

Transmission oil filter (HST models)

Transmission · every 200 hours

HST models only. The chart gives 200 hours (first at 50 hours). The handbook drains the transmission case, changes the filter and refills to the dipstick notch; use only a Kubota genuine filter.

Part	Qty	Notes	Part number
Transmission oil filter (HST)	1	Kubota genuine only. Check your handbook or dealer for the number	check your handbook

Step-by-step

Remove the drain plugs on both sides and drain the case.
Change the filter, wetting the seal with clean fluid.
Refill to the upper notch and recheck after a few minutes of running.

Tools: Drain tray (20 L), Filter wrench

Transmission fluid and hydraulic filter change

Transmission · every 400 hours

Every 400 hours, with the hydraulic oil filter. Fill with Kubota SUPER UDT fluid. After changing, run at medium speed for a few minutes before working, and turn the steering both ways to bleed air if the three-point hitch will not lift.

Part	Qty	Notes	Part number
Transmission fluid	1	UTTO tractor transmission oil: Kubota UDT or SUPER UDT. 14 L (B2320DTN) or 15 L (other models). Aztec Oils match: AGRITEC UTTO	check your handbook
Hydraulic oil filter	1	Kubota genuine only. Check your handbook or dealer for the number	check your handbook

Step-by-step

Drain the case from the bottom plug (both side plugs on the B2320DTN).
Change the hydraulic filter with a film of fluid on the seal; hand tight plus half a turn.
Refill to the upper notch, run the engine a few minutes, stop, recheck and top up.

Tools: Drain tray (20 L), Filter wrench

Front axle case oil change (4WD)

Axles · every 400 hours

Every 400 hours on 4WD models. The handbook drains the left and right plugs and the filler plug, refills to the dipstick notch, then rechecks after ten minutes.

Part	Qty	Notes	Part number
Front axle oil	1	UTTO tractor transmission oil (Kubota UDT or SUPER UDT) or SAE 80 to 90 gear oil. 3.0 L (B2320DTN) or 3.2 L (others)	check your handbook

Step-by-step

Park level, remove the drain plugs and filler plug and drain.
Refit the drain plugs and fill to the upper notch.
Recheck after ten minutes and refit the plug.

Tools: Drain tray (5 L)

Front axle pivot adjustment (4WD)

Axles · every 400 hours

The chart gives 400 hours. Wheel shake through the steering wheel means the pivot pin is out of adjustment. The handbook figure is an oscillating load of 50 to 100 N and refers you to a dealer for details.

Step-by-step

Loosen the lock nut and tighten the adjusting screw to the 50 to 100 N oscillating load.
If you back the screw off and retighten, put liquid gasket on its tip, then tighten the lock nut.

Tools: Spanners, Spring balance

Fuel filter: clean and replace

Fuel · every 400 hours

Check or clean every 100 hours and replace the element every 400 hours. Bleed the fuel system after any work on the fuel line.

Part	Qty	Notes	Part number
Fuel filter element	1	Kubota number per FridayParts filter kit 77700-03365 listing (B2320HSD, B2620HSD, B2920HSD)	6A320-59930

Step-by-step

Clean the filter at 100 hours.
Replace the element at 400 hours and bleed the system.

Tools: Container

Valve clearance, injectors and injection pump (dealer)

Engine · every 800 hours

Valve clearance every 800 hours, injection nozzle pressure every 1,500 hours and injection pump every 3,000 hours. The handbook says consult your Kubota dealer for these.

Step-by-step

Book in with your Kubota dealer.

Coolant change and system flush

Cooling · every 2 years

The chart gives 2 years for the flush and the coolant change. Coolant capacity is 3.9 L with the recovery tank. Use clean soft water with antifreeze.

Part	Qty	Notes	Part number
Coolant	1	Antifreeze with clean soft water, about 3.9 L with recovery tank	check your handbook

Step-by-step

Drain the radiator and flush.
Refill with antifreeze mix.

Tools: Drain tray (6 L)

Oils, fluids and capacities

System	Oil or spec	Capacity
Engine	Kubota three-cylinder diesel (the handbook lists the B2320, B2620 and B2920 together)
Engine oil	SAE 30, 20 or 10W by temperature, or 10W-30 or 15W-40. API CF, CF-4, CG-4, CH-4 or CI-4; not CJ-4	B2320 3.1 L with filter; B2920 3.5 L (B2620: 3.1 L in the lubricant table, 3.5 L on the oil-change page)
Coolant	Fresh clean soft water with antifreeze, 3.9 L with recovery tank
Transmission and hydraulics	Kubota UDT or SUPER UDT fluid	14 L (B2320DTN), 15 L (other models)
Front axle case	Kubota UDT or SUPER UDT fluid, or SAE 80 to 90 gear oil	3.0 L (B2320DTN), 3.2 L (other models)
Fuel tank	No. 2-D diesel (No. 1-D below -10 C)	26 L
Coolant	Soft water with antifreeze	3.9 L
Grease	NLGI-2 or NLGI-1 multipurpose (GC-LB)	Until it overflows

Specifications


Fuel	Cetane 45 minimum; diesel above 0.5 % sulphur halves the oil interval

Known problems

Engine oil class

The handbook says CF-4, CG-4 and CH-4 oils cannot be used on external-EGR engines, and CJ-4 oil cannot be used at all on this tractor.

B2620 engine oil capacity

The oil-change page and the lubricant table disagree on whether the B2620 takes 3.1 L or 3.5 L. Fill to the dipstick.

Parts list with genuine part numbers

Kubota B2320, B2620, B2920 - maker filter/service sheets and parts lists already cited on the site entry; serial splits are in the row notes

Engine service

Part	Part number	Qty	Notes
Air cleaner primary element	6C060-99410	1	Kubota number for the outer element per FridayParts filter kit 77700-03365 listing; secondary element not found
Air cleaner secondary element	32721-58242	1	Listing names B2320 and B2620 (not B2920); 32721-58240 is the alternate. Check yours.

Fuel

Part	Part number	Qty	Notes
Fuel filter element	6A320-59930	1	Kubota number per FridayParts filter kit 77700-03365 listing (B2320HSD, B2620HSD, B2920HSD)

Sources

Open Farmyard Workshop