Description

Kubota B20 Parts Catalog – 251-Page OEM Breakdown for Engine, Transmission, Hydraulics

If you are tracking down a part number for a B20 and you are stuck with a fuzzy diagram from an aftermarket site, I know the frustration. That is why I use the OEM parts catalog. The Kubota B20 Parts Catalog is 251 pages of factory-sourced part numbers, exploded views, and interchangeability codes. No guessing if a valve stem seal from a different serial number range fits – the manual tells you exactly.

Crankshaft, Piston, and Main Bearing Case – What the Parts Catalog Covers

Look at the ENGINE section. It breaks down the crankcase, oil pan, piston/crankshaft assembly, main bearing case, and flywheel. Each component gets its own reference number and part number. Page 3 of the catalog shows the index with item numbers for the crankshaft (01T003) and the main bearing case (01T004). If you need a new crankshaft for your B20, you cross-reference the serial number range in the S.No. column. The remarks column tells you if the part is exclusive to certain countries – say EXCEPT [FR] – meaning it works in the USA but not France. That kind of detail saves you from ordering the wrong part.

Valve, Rocker Arm, and Cylinder Head – Proper Part Numbers

Cylinder head (01T006) and valve/rocker arm assembly (01T007) are listed with their own part numbers. The catalog includes component parts for the nozzle holder, cylinder head cover, inlet and exhaust manifolds. If you are rebuilding the top end, you can order the correct valve stem seals, rocker arm shafts, and head bolts by part number. No guesswork. The valve train components are indexed under the ENGINE group on page 3.

Fuel System: From Fuel Tank to Injection Pump

Fuel system is covered in the ALL PRODUCT INDEX under FUEL SYSTEM. The catalog lists fuel tank, fuel pipe 1, fuel filter component parts, fuel pipe 2, and the injection pump (01T020) with its own component parts page. The fuel camshaft (01T019) is separate from the main camshaft – important when you are ordering for a diesel. If you need the injection pump drive gear, the part number is right there. For the B20, the fuel system section is tied to the engine stop lever and speed control plate.

251 Pages of OEM Part Numbers – Why Aftermarket Catalogs Fall Short

This catalog runs 251 pages. Aftermarket parts lists often condense multiple models into one chart and leave out country codes, serial number ranges, and interchangeability marks. Kubota’s OEM catalog uses symbols like ↔ (interchangeable) and # (not interchangeable). It also includes notes like ‘except [FR]’ or ‘except [CA]’. That matters when you are ordering for a tractor originally sold in Canada. The B20 has been around long enough that serial number splits exist – the catalog accounts for them. If you also work on other Kubota engines, the Kubota V3300-T-E2B-EPS-1 Parts Catalog – 53-Page OEM Parts Breakdown covers that engine family. For the compact tractor series, the Kubota YU4210, YW0981 Parts Catalog – 274-Page OEM Parts Breakdown has transmission and axle parts. And for mower decks, the Kubota RCK60-27B Parts Catalog – 27-Page OEM Breakdown is useful.

Understand the Country Codes and Interchangeability

Page 1 of the catalog explains the column headings. Ref. No., Part No., Description, Q’ty, S.No., I/C, and Remarks. The I/C column uses arrows and hashes to tell you if a part supersedes older ones or is not backward compatible. The country code section lists A (USA), CA (Canada), FR (France), etc. If the remarks column says EXCEPT [FR], that part works everywhere except France – meaning it fits B20s sold in the US. You do not see that kind of specificity in a third-party PDF. The catalog follows OEM documentation practices that align with Automotive Industry Overview. For background on why factory manuals matter, see Automotive Industry Overview.

Frequently Asked Questions

Does this catalog include torque specifications?

No. This is a parts catalog, not a service manual. Torque specs are in the service manual.

How do I find the right part for my B20 with a specific serial number?

Look at the S.No. column on each parts page. The catalog gives a serial number range for each part. Your tractor’s serial number should be greater than or equal to (>=) the number shown, and less than or equal to (<=) the upper value. If the I/C column shows a double arrow (↔), that part works for older and newer serial numbers. If it shows a hash (#), the part is not interchangeable. Also check the Remarks column for country code exclusions. For example, if it says EXCEPT [FR], the part is for USA and other countries but not France. Always verify your serial number before ordering.

If you are tired of cross-referencing fuzzy aftermarket diagrams and want the actual factory part numbers Kubota assigned at the time of printing, get this catalog on your workbench. Access the Factory Manual today and stop wasting time on wrong parts.