Description

Kubota B1630, B1640 Parts Catalog – What the Factory Ships

If you’re ordering a Kubota B1630, B1640 Parts Catalog, you already know the pain of guessing wrong. You pull a seal, the groove looks right, but the part number is scratched off. You flip through a generic catalog and cross your fingers. Then the part doesn’t fit, and the machine sits for a week. This 34-page OEM catalog kills that cycle. It’s the same booklet Kubota dealers used to order parts before everything went digital. Exploded diagrams, factory part numbers, and serial number break points that tell you exactly which revision fits your loader. No aftermarket summaries.

Instructions for Parts Books – Read This First

The first two pages of this manual explain how the factory indexes parts. Column headers like REF.No, Part No., Description, Q’ty, S.No., I/C, and Remarks are defined. The I/C column shows interchangeability: left-right arrows mean the part works across serial number ranges; number sign means it does not. There’s also a table of country codes—A for USA, CA for Canada, FR for France, etc. If the Remarks column says “EXCEPT [FR]”, that part works in every country except France. That means it works here in the U.S. Do not skip reading these two pages; they prevent ordering a part that is flagged for a different market.

Page breakdown: the catalog is divided by sub-frame versions and hydraulic configurations. You will find sections for B1633, B1634, B1635, and B1639 sub-frames, then separate tractor hydraulics sections for the paired models. The loader hydraulics are split by serial number ranges with a “<=" or ">=” notation. If your B1630 has serial number 22004921 or lower, you use the hydraulics section on page 01019. If it’s 22004922 or higher, page 01020. Same for B1640/A with the 2400xxxx series. This kind of exact breakpoint is what you never get from a third-party reprint.

B1633 Sub-Frame & Components – Example of Diagram Utility

Take the B1633 sub-frame section as an example. Part numbers like 70050-01594 (UPRIGHT), 70050-01596 (UPRIGHT), 70050-01638 (SUB-FRAME ASSY) are listed with quantities and serial number applicability. Labels for Caution, Warning, and Control are included. If you need the control label because yours peeled off, the part number is there. The diagram picture (not shown in the PDF excerpt) aligns with the reference numbers so you can visually locate the part. This is factory documentation—no artist’s interpretation, no redrawn lines that hide the real mounting hole.

Control Valve and Pressure Relief Cartridge

The catalog dedicates a full page to the B1630 40 & 40A CONTROL VALVE and another to the PRESSURE RELIEF CARTRIDGE. If your loader’s hydraulic relief is opening early, you need that cartridge part number. The valve section shows the complete assembly with all internal spools, springs, and seals. You can order the exact seal kit without buying a whole valve. This is where a parts catalog becomes a repair enabler instead of just a shopping list. Kubota V3300-T-E2B-EPS-1 Parts Catalog – 53-Page OEM Parts Breakdown covers a different engine platform but follows the same layout logic.

Lift Cylinder and Bucket Cylinder – Serial Number Split

Lift and bucket cylinders have separate sections depending on serial number range. B1630 <=2004921 and B1640/A <=244005472 use one cylinder design; above those numbers uses a different one. The part numbers for the cylinder tube, rod, piston, seals, and bushings are listed individually. If you are rebuilding the cylinder, you need these numbers to source the correct seal kit. The bucket cylinder follows the same pattern. Without this catalog, you would measure old parts and hope. With it, you order by factory spec. Kubota YU4210, YW0981 Parts Catalog – 274-Page OEM Parts Breakdown is another example of Kubota’s precise serial-number-based documentation.

OEM catalogs like this one are the only way to be sure you are not fitting a part that Kubota superseded three years ago. Aftermarket websites aggregate data from multiple sources and often mix up B1630 and B1640 parts because the loaders share components but have different breakpoints. This catalog lists each part against its specific model and serial number range. No guesswork. Kubota RCK60-27B Parts Catalog – 27-Page OEM Breakdown shows the same approach for mower decks – if you work on Kubota equipment, you want this level of detail.

3 Reasons to Choose OEM Documentation Over Aftermarket

First, the diagrams are scanned from the factory original, not redrawn to fit a generic template. Second, serial number breakpoints are exact – you do not have to interpret vague statements like “fits early models.” Third, country codes prevent you from ordering a part intended for a European market that may have different safety labeling or materials. Aftermarket catalogs strip out the I/C column and the country codes because they think nobody cares. Experienced mechanics know that the I/C column tells you if a part has been superseded and whether it is backward-compatible.

FAQ

How do I know which section applies to my B1630 serial number?

Look at the S.No. column. If the serial number is listed as “<=22004921" you use pages for that range. If "=>22004922″ use the later section. The same logic applies for B1640/A.

What does the I/C column mean? I see arrows and hash marks. For example, on page 4 of the B1633 sub-frame section, some parts show arrows. I need to know if a part I am replacing is interchangeable with a newer revision. The I/C column uses left-right arrows to indicate the part works for older and later serial numbers. A hash mark (#) means it is not interchangeable. An arrow pointing to the right means the new part replaces the old; left means the old part can be used for the new. This is critical when ordering from dealerships that may have superseded stock. Without understanding I/C you might buy a part that is obsolete and cannot be returned.

This 34-page manual covers sub-frames, hydraulics, control valve, pressure relief, lift cylinder, bucket cylinder, and all mounting hardware for the B1630 and B1640 loaders. Every part number is factory-verified. The PDF is scanned from an original Kubota publication—no watermarks, no trimmed margins. If you are rebuilding a loader cylinder or replacing a control valve cartridge, you want the exact numbers. The cylinder sections alone justify the price. Automotive Industry Overview may tell you about manufacturing standards, but this catalog tells you what fits your specific loader. Access the Factory Manual and keep a copy in your shop binder next to the service manuals you already trust.