Kubota 50-Hour Service: What the Manuals Require

Thank you for reading this post, don't forget to subscribe!

Quick Answer

Kubota’s operator manuals list these jobs every 50 hours: greasing, checking the engine-start system, checking the operator-presence control (OPC), and checking wheel-bolt torque. The BX manual also lists the lock lever. When you change engine oil, put a film of oil on the new filter’s rubber seal, tighten until it contacts the mount, then an additional 1/2 turn by hand only. Engine oil capacity with filter runs from 3.0 L on the BX1880 to 5.7 L on the L2501. We could not verify a complete “first 50 hours” checklist from the manuals, so check the schedule and its notes in your own manual.

Orange product names and part numbers are Amazon affiliate links (we may earn a commission at no cost to you).

Buying used? Start with our used Kubota tractor inspection guide. Not sure of your model? Use the model number decoder.

What the Manuals List Every 50 Hours

Model	Listed every 50 hours	Source (printed pages)
BX1880 / BX2380 / BX2680	Engine-start system check, OPC check, greasing, wheel-bolt torque, lock lever check and clean	Operator’s manual schedule p. 69; procedures pp. 79–81, 87
B2301 / B2601	Grease fittings, engine-start system check, wheel-bolt torque	Recurring tasks pp. 55–56
B2650	Grease fittings, engine-start system check, wheel-bolt torque	Recurring tasks pp. 68–69 (B2650/B3350 manual)
L2501	Grease fittings, engine-start system check, OPC check, wheel-bolt torque	Grease pp. 55–56; safety and wheel checks pp. 57–58
L3901	Grease fittings (separate 2WD and 4WD instructions), engine-start system check (manual and HST tests), OPC check, wheel-bolt torque	L3301/L3901 manual pp. 101–104
L4701	Engine-start system check, wheel-bolt torque, greasing, OPC check	Schedule p. 91; procedures pp. 105–106

The “First 50 Hours” Checklist

Kubota’s schedules mark some jobs, such as the engine oil, engine-oil filter and transmission filter, with a symbol or note that applies to the first service. The text we could read lost those symbols, so we could not confirm a complete break-in checklist for any model. Do not assume a job is or is not due at 50 hours from this page. Look at the schedule and its notes in your own manual, or ask your dealer. For the B2301 and B2601, one edition’s schedule note says marked jobs “must be done after the first 50 hours,” but its markers were not preserved.

Earlier versions of this page said the 50-hour service was mandatory and that skipping it voids the warranty. We removed those claims because the manuals do not say that. See the warranty section below for what they do say.

Engine Oil Capacity With Filter

Model	With filter	Source (printed page)
BX1880	3.0 L (3.17 U.S. qt)	BX manual p. 86
BX2380	3.3 L (3.49 U.S. qt)	BX manual p. 86
BX2680	4.0 L (4.23 U.S. qt)	BX manual p. 86
B2301 / B2601	3.1 L (3.3 U.S. qt)	B2301/B2601 manual, specifications p. 2
B2650	4.0 L (4.2 U.S. qt)	B2650/B3350 manual p. 75
L2501	5.7 L (6.0 U.S. qt)	L2501 manual p. 65
L3901, L4701	Not found	Capacity row not retrieved

Fill to the dipstick mark, not to the number. Our engine oil capacity guide has more models.

Oil Filter Part Numbers

Model	Engine oil filter	Notes
BX1880, BX2380, BX23S	HH150-32430 (serial up to 4NDZ999); HH1J0-32430 (4NE0001 and up)	Match by serial number
BX2680	HH150-32094	Not the same as the other BX models
B2301, B2601, B2650	HH150-32094	B2301 not independently verified
L2501, L3901, L4701	HH164-32430	Also used on the L3301

For aftermarket matches and the HST and hydraulic filters, which are separate from the engine oil filter, see the filter master chart and the oil filter cross-reference guide.

Installing the Oil Filter: Kubota’s Instruction

For the BX1880, BX2380, BX2680 (p. 86) and the L2501 (p. 65), the manuals give this sequence:

Put a film of clean engine oil on the rubber seal of the new filter.
Tighten the filter quickly until it contacts the mounting surface.
Tighten the filter by hand an additional 1/2 turn only.
Check for leaks, then check the dipstick and add oil to the prescribed level.

Correction

An earlier version of this page said “3/4 turn, maximum 18 ft-lbs.” Kubota’s manuals say 1/2 turn by hand only, and we found no torque figure for the filter. We did not find the filter instruction for the B2301, B2601, B2650, L3901 or L4701, so read yours.

Engine Oil Grade

Only the BX table was fully verified. The BX manual says “API Service Classification CF or higher” and lists CF, CF-4, CG-4, CH-4 or CI-4 for engines without external EGR on ultra-low-sulfur fuel. It adds: “The CJ-4 engine oil is intended for DPF (diesel-particulate-filter) type engines, and cannot be used on this tractor.” That is the wording of that edition.

Ambient temperature	SAE viscosity (BX1880 / BX2380 / BX2680)
Above 25 °C (77 °F)	SAE 30, 10W-30 or 15W-40
−10 °C to 25 °C (14 °F to 77 °F)	SAE 20, 10W-30 or 15W-40
Below −10 °C (14 °F)	SAE 10W-30

We did not find the grade table for the B2301, B2601, B2650, L2501 or L3901. The L4701 procedure mentions DPF-compatible oil (CJ-4), but we did not find its full table. Do not carry the BX table over to another model. See the oil type guide and the engine oil cross-reference guide.

Greasing

For the BX1880, BX2380 and BX2680, the lubrication table lists the following points and calls for multipurpose EP2 grease, NLGI No. 2 (p. 71):

Point	Count
Battery terminals	2
Speed-control pedal	1
Rear link	4
Bonnet lock	1
Bonnet guide	1

That table counts lubrication points, and some, like battery terminals and the bonnet, are not grease fittings, so we cannot give a total number of zerks. For the L2501, the manual figures show the front axle support, pedal shaft, lifting rod and tie-rod ends. The B2301, B2601, B2650, L3901 and L4701 have grease-fitting instructions (the L3901 separately for 2WD and 4WD), but we could not read the counts or locations. Earlier versions of this page gave zerk counts (15, 18–22, 25+) and pump counts that we could not source, so they are gone. See our greasing guide and your own manual for the points on your model.

Air Cleaner

Model	Clean	Replace	Source (printed page)
BX1880 / BX2380 / BX2680	Every 100 h	Every 1000 h or 1 year	Schedule p. 69
B2301 / B2601	Primary element, every 100 h	Primary and secondary, every 1 year	Contents headings pp. 58, 67
B2650	Primary element, every 100 h	Annually in one edition; every 1000 h or 1 year in another	pp. 59, 79
L2501	Every 100 h	Every 1000 h or 1 year	pp. 59, 68
L3901	Every 100 h	Every 1000 h or 1 year	pp. 104, 116
L4701	Primary, every 100 h	Primary and secondary, every 1000 h or 1 year	Schedule p. 91

The L2501 and L3901 manuals also list cleaning the evacuator valve in the daily checks. Cleaning the primary element does not mean you may clean and reuse the secondary one, and we found no cleaning method, air-pressure figure or foam pre-cleaner step in the pages we could read, so follow your manual. So, air cleaner cleaning is a 100-hour job in the manuals, not a 50-hour one.

Warranty and Service Records

The B2301/B2601 manual says: “This tractor is warranted under the KUBOTA Limited Express Warranty, a copy of which may be obtained from your selling dealer.” It continues: “No warranty shall, however, apply if the tractor has not been handled according to the instruction given in the Operator’s Manual even it is within the warranty period.” (p. 1). The L2501 manual says the owner is responsible for the required maintenance of the emissions-related critical parts in its schedule.

We found no manual requirement to keep receipts or a log, and we did not verify the warranty pages for the BX, B2650, L3901 or L4701. Keeping a record of the date, hour meter reading and parts used is still sensible, and your dealer can tell you what your warranty needs.

Where to Buy Parts and Tools

Filters

Order by part number and match your serial range.

Oil Filter HH150-32430
BX1880, BX2380 and BX23S, up to serial 4NDZ999.

Check Price on Amazon

Oil Filter HH164-32430
L2501, L3901, L4701.

Check Price on Amazon

Tools and Supplies

General service items. Use a filter wrench for removal only, as Kubota says to tighten by hand.

Heavy Duty Grease Gun
For tractors with many fittings.

Check Price on Amazon

LockNLube Grease Coupler
Locks onto the fitting.

Check Price on Amazon

Lucas Red N Tacky Grease NLGI #2
NLGI No. 2, as the BX manual specifies.

Check Price on Amazon

Oil Filter Wrench
Removal only.

Check Price on Amazon

GearWrench 20pc Ratcheting Combo Wrench Set
Covers the drain plug and other fasteners.

Check Price on Amazon

20 Gallon Waste Oil Drain Pan with Electric Pump
Clean drain and disposal.

Check Price on Amazon

Fluid Transfer Pump
For tight engine bays.

Check Price on Amazon

Nitrile Gloves 100-Pack
Oil change protection.

Check Price on Amazon

Shop Towels
Wipe each fitting before greasing.

Check Price on Amazon

Kubota Shop Manual
Model-specific procedures and specs.

Check Price on Amazon

What We Could Not Verify

A complete first-50-hours checklist for any model, and the first service interval of the HST filter (the manuals list 200 hours as the recurring interval).
Engine oil capacity for the L3901 and L4701, and the oil grade table for every model except the BX.
The oil-filter instruction for the B2301, B2601, B2650, L3901 and L4701, and any filter torque figure.
Grease-fitting totals and locations for every model, and any pump count.
The air-cleaner cleaning method, and a foam pre-cleaner step.
Warranty pages for the BX, B2650, L3901 and L4701, and any requirement to keep records.
Dealer price, DIY savings, time estimates, wear and failure percentages, and resale claims from earlier versions, which we removed.

How We Verified This Page

Every specification comes from Kubota operator’s manuals hosted by ManualsLib, Scribd and ManualMachine, with printed page numbers shown (checked Oct 21, 2026). Part numbers come from our verified filter research. Dealer pages, forum posts and reader comments were not used. Your own manual is the final word for your serial number.

❓Frequently Asked Questions

QWhat does the Kubota 50-hour service include?

The manuals list greasing, checking the engine-start system, checking the operator-presence control and checking wheel-bolt torque every 50 hours. The BX also lists the lock lever. Whether the engine oil and filter are due at 50 hours depends on notes in your schedule that we could not read, so check your manual.

QHow tight should the oil filter be?

Kubota’s BX and L2501 manuals say to tighten the filter until it contacts the mounting surface, then by hand an additional 1/2 turn only. Put a film of clean engine oil on the rubber seal first.

QHow much oil does my Kubota take with a filter?

The BX1880 takes 3.0 L, the BX2380 3.3 L, the BX2680 4.0 L, the B2301 and B2601 3.1 L, the B2650 4.0 L and the L2501 5.7 L, per Kubota’s operator’s manuals. We could not verify the L3901 or L4701.

QCan I use CJ-4 oil in my Kubota?

The BX manual says CJ-4 oil is for DPF engines and cannot be used on that tractor. We did not find the equivalent table for other models, so check your own manual.

QDoes skipping the 50-hour service void my warranty?

We found no manual wording that says so. The B2301/B2601 manual says no warranty applies if the tractor has not been handled according to the Operator’s Manual. Ask your dealer what your warranty requires.

QHow often do I repeat it?

Greasing, the engine-start and OPC checks and the wheel-bolt torque check are listed every 50 hours. Air cleaner cleaning is every 100 hours and air cleaner replacement every 1000 hours or 1 year. See our oil change interval guide for oil.

Related Guides

Oil Change Interval Guide →

Intervals after break-in

Engine Oil Capacity Guide →

Capacities by model

Oil Type Guide →

15W-40 vs 10W-30

Filter Master Chart →

Part numbers by series

Greasing Guide →

Lubrication points

Transmission Fluid Check →