Kubota B2301, B2601 service schedule

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

Every maker's service job for the Kubota B2301, B2601, 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.

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Versions: B2301 (HST); B2601

Service intervals

Job	When
Grease all fittings	every 50 hours
Air cleaner elements	every 100 hours or every year
Engine oil and filter change	every 200 hours
Transmission oil filters (HST)	every 200 hours
Front toe-in check	every 200 hours
Transmission fluid and hydraulic filter change	every 400 hours
Front axle case oil change	every 400 hours
Front axle pivot adjustment	every 400 hours
Fuel filter element	every 400 hours
Valve clearance, injectors and pump (dealer)	every 800 hours
Coolant change and flush	every 2,000 hours or every 2 years
Hoses and fuel line	every year

Service jobs and parts

Grease all fittings

Chassis · every 50 hours

Every 50 hours: top link, right lift rod, brake pedal (one point each) and battery terminals (two).

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

Step-by-step

Grease each point until it overflows; smear the battery terminals.

Tools: Grease gun

Air cleaner elements

Intake · every 100 hours or every year

Clean the double-element primary every 100 hours. Replace the primary and secondary every 1,000 hours or 1 year.

Part	Qty	Notes	Part number
Air cleaner primary element	1	Kubota number as quoted on kit listings naming B2301 and B2601 (6C060-99414 also seen).	6C060-99410
Air cleaner secondary element	1	Kubota number as quoted on listings naming B2301 and B2601 (32721-58240 alternate).	32721-58242

Step-by-step

Clean the primary at 100 hours.
Replace both at 1,000 hours or one year.

Tools: Compressed air (low pressure)

Engine oil and filter change

Engine · every 200 hours

The service chart gives 200 hours for the engine oil and the oil filter, with the first change at 50 hours.

Part	Qty	Notes	Part number
Engine oil	1	10W-30 or 15W-40 (SAE 30 above 25 C, SAE 20 from -10 to 25 C, 10W-30 below -10 C). API CF, CF-4, CG-4, CH-4 or CI-4; not CJ-4. 3.1 L with filter. Aztec Oils match: EMPROTEC SHPD 10W-30	check your handbook
Engine oil filter	1	Kubota genuine. Check your handbook or dealer for the number	check your handbook

Step-by-step

Drain the oil, refit the plug and change the filter.
Fill to the dipstick and recheck after running.

Tools: Drain tray (5 L), Filter wrench

Transmission oil filters (HST)

Transmission · every 200 hours

The chart gives 200 hours for the HST transmission oil filters, first change at 50 hours.

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

Step-by-step

Change the filters at 200 hours, with the first at 50 hours.

Tools: Filter wrench

Front toe-in check

Axles · every 200 hours

The chart gives 200 hours for toe-in adjustment. Fan belt and brake adjustment and battery checks are every 100 hours.

Step-by-step

Check the toe-in and adjust.

Tools: Tracking gauge

Transmission fluid and hydraulic filter change

Transmission · every 400 hours

Every 400 hours, with the hydraulic oil filter (first filter change at 50 hours). Kubota recommends SUPER UDT-2; regular UDT is also permitted.

Part	Qty	Notes	Part number
Transmission fluid	1	UTTO tractor transmission oil: Kubota SUPER UDT-2 (regular UDT also permitted). 15 L. Aztec Oils match: AGRITEC UTTO	check your handbook
Hydraulic oil filter	1	Kubota genuine. Check your handbook or dealer for the number	check your handbook

Step-by-step

Drain the case and change the hydraulic filter.
Refill and recheck the dipstick.

Tools: Drain tray (20 L), Filter wrench

Front axle case oil change

Axles · every 400 hours

Every 400 hours on 4WD. 3.5 L.

Part	Qty	Notes	Part number
Front axle oil	1	Kubota SUPER UDT-2 fluid or SAE 80 to 90 gear oil (80W-90). 3.5 L. Aztec Oils match: TRANSMATEC EP-4 80W-90	check your handbook

Step-by-step

Drain, refit plugs and refill to the dipstick.

Tools: Drain tray (5 L)

Front axle pivot adjustment

Axles · every 400 hours

The chart gives 400 hours.

Step-by-step

Adjust the pivot as the handbook describes, or book a dealer.

Tools: Spanners

Fuel filter element

Fuel · every 400 hours

Clean every 100 hours, replace every 400 hours.

Part	Qty	Notes	Part number
Fuel filter element	1	Kubota number as quoted on kit listings naming B2301 and B2601.	6A320-59930

Step-by-step

Clean the filter at 100 hours; replace at 400.

Tools: Container

Valve clearance, injectors and 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 (dealer work).

Step-by-step

Book in with your Kubota dealer.

Coolant change and flush

Cooling · every 2,000 hours or every 2 years

Every 2,000 hours or 2 years, whichever is first. Coolant is 3.8 L.

Part	Qty	Notes	Part number
Coolant	1	Antifreeze with clean soft water, 3.8 L with recovery tank	check your handbook

Step-by-step

Drain and flush the radiator.
Refill with antifreeze mix.

Tools: Drain tray (6 L)

Hoses and fuel line

Cooling · every year

Check radiator hoses, fuel line and intake air line every year and replace every 4 years.

Step-by-step

Check hoses and clamps annually.
Replace at 4 years.

Tools: Screwdriver

Oils, fluids and capacities

System	Oil or spec	Capacity
Engine	Kubota three-cylinder diesel (the handbook covers B2301 and B2601 together)
Engine oil	SAE 30, 20 or 10W-30 by temperature, or 15W-40. API CF, CF-4, CG-4, CH-4 or CI-4; not CJ-4	3.1 L with filter
Coolant	Soft water with antifreeze, 3.8 L with recovery tank
Transmission and hydraulics	Kubota SUPER UDT-2 (UDT also permitted)	15 L
Front axle case	Kubota SUPER UDT-2 or SAE 80 to 90 gear oil	3.5 L
Fuel tank	No. 2-D S15 diesel (No. 1-D S15 below -10 C)	23 L
Coolant	Soft water with antifreeze	3.8 L
Grease	NLGI-2 or NLGI-1 (GC-LB)	Until it overflows

Specifications


Fuel	Cetane 45 minimum, EN 590 or ASTM D975

Known problems

Oil class

CJ-4 oil is for DPF engines and cannot be used on this tractor.

Parts list with genuine part numbers

Kubota B2301, B2601 - 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 as quoted on kit listings naming B2301 and B2601 (6C060-99414 also seen).
Air cleaner secondary element	32721-58242	1	Kubota number as quoted on listings naming B2301 and B2601 (32721-58240 alternate).

Fuel

Part	Part number	Qty	Notes
Fuel filter element	6A320-59930	1	Kubota number as quoted on kit listings naming B2301 and B2601.

Sources

Open Farmyard Workshop