Pin walked out of the lift frame? Bucket cylinder weeping at the rod? This Kubota B1630 Parts Catalog (OEM #100Z0002) gives you 34 pages built around one job: getting the right part number before you click order. Exploded views cover the B1633, B1634, B1635, and B1639 sub-frames, loader hydraulic component diagrams split between pre and post serial 22004922 machines, lift and bucket cylinder breakdowns, plus the single lever control valve with its pressure relief cartridge. Cross-reference the lift cylinder locknut at 70050-02489 in 3/4-16, or pull filler cap 06314-60060 straight off the diagram. Order the wrong O-ring twice and you have already paid for this catalog. Bookmarked by section, opens on your phone at the parts counter or your laptop in the shop.
What's Inside This Kubota B1630 Parts Manual
| System | Pages |
|---|---|
| B1633 Sub-Frame & Components | 3-4 |
| B1634 Sub-Frame & Components | 5-6 |
| B1635 Sub-Frame & Components | 7-8 |
| B1639 Sub-Frame & Components | 9-10 |
| B1633&39 Tractor Hydraulics | 11-12 |
| B1634&35 Tractor Hydraulics | 13-14 |
| B1630 40 & 40A Lift Frames & Components | 15-16 |
| B1630 40 & 40A Single Lever Control | 17-18 |
| B1630 40 & 40A Control Valve | 19-20 |
| Pressure Relief Cartridge | 21-22 |
| Loader Hydraulics B1630 <=22004921 B1640/A <=24005472 | 23-24 |
| Loader Hydraulics B1630 =>22004922 B1640/A =>24005473 | 25-26 |
| Lift Cylinder B1630 <=2004921 B1640/A <=244005472 | 27-28 |
| Bucket Cylinder B1630 <=22004921 B1640/A <=2005472 | 29-30 |
| Lift Cylinder B1630=>22004922 B1640/A =>24005473 | 31-32 |
| Bucket Cylinder B1630=>22004922 B1640/A=>24005473 | 33-34 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Filler Cap (06314-60060) Weight | 0.029 kgf | p. 12 |
| O-Ring (04811-00200) Weight | 0.001 kgf | p. 14 |
| Copper Washer (04714-00300) Weight | 0.0044 lb | p. 14 |
| Optional Bucket Type | BUCKET 42 RND BACK | p. 16 |
| Lift Cylinder Locknut (70050-02489) Size | 3/4-16 | p. 28 |
| Bucket Cylinder Locknut (70050-93642) Size | 1/2-20 | p. 30 |
Kubota B1630 Common Problems This Manual Covers
Lift cylinder seal kit part number unclear for serial numbers at or below 2004921 p. 27
Open the lift cylinder exploded view on page 27 for machines at or below serial 2004921. Identify each seal, wiper, and O-ring against the parts list on page 28. Confirm the locknut callout matches 70050-02489 in the 3/4-16 size before ordering, since the later serial range uses different internals.
Manual Section: Lift Cylinder B1630 <=2004921 B1640/A <=244005472Bucket cylinder rebuild parts look different between two machines in the same fleet p. 29
Match the machine serial number first. For units at or below 22004921, use the exploded view on page 29 and verify the locknut as 70050-93642 in 1/2-20 size on page 30. Units from 22004922 and up use the diagram on page 33, which has a different piston and rod assembly callout.
Manual Section: Bucket Cylinder B1630 <=22004921 B1640/A <=2005472Can't identify the correct control valve internals or pressure relief cartridge for the loader p. 19
Pull the control valve breakdown on page 19 and trace each spool, spring, and detent to the parts list. The pressure relief cartridge has its own exploded view on page 21, listed as a separate assembly. Order the cartridge as a complete unit rather than individual internal parts, since the spring and poppet are not sold loose.
Manual Section: B1630 40 & 40A Control ValveHydraulic hose and fitting part numbers needed after a hose was routed wrong during service p. 23
Trace the loader hydraulics diagram on page 23 for serial numbers up to 22004921, or page 25 for 22004922 and later. Each hose is numbered against the parts list with its correct port and routing. Replace O-ring 04811-00200 (0.001 kgf, page 14) at every fitting joint you break loose.
Manual Section: Loader Hydraulics B1630 <=22004921 B1640/A <=24005472Filler cap and reservoir hardware part numbers missing for tractor hydraulic top-up p. 11
Go to the tractor hydraulics diagram on page 11 for B1633 and B1639 models, or page 13 for B1634 and B1635. The filler cap is listed as 06314-60060 with a weight of 0.029 kgf on page 12. Cross-check the copper washer 04714-00300 callout before reusing any sealing surface.
Manual Section: B1633&39 Tractor HydraulicsOptional bucket size selection unclear when ordering a replacement loader bucket p. 15
Review the lift frame and bucket diagram on page 15. Three optional buckets are listed on page 16: 42 inch round back, 48 inch round back, and 54 inch round back. Match the bucket pin spacing to the lift frame callouts before ordering, since the mounting hardware ships separately from the bucket shell.
Manual Section: B1630 40 & 40A Lift Frames & ComponentsFrequently Asked Questions
Is this Kubota B1630 Parts Catalog a digital download?
Yes, a 34-page searchable PDF, ready for instant download. Opens on any device, including your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this Kubota B1630 manual?
None. Print individual pages, full chapters, or the whole catalog. The PDF is fully unlocked.
Are there hydraulic schematics in this Kubota B1630 manual?
This is a parts catalog, so it shows exploded parts diagrams rather than circuit schematics. It includes detailed exploded views of the hydraulic components — pump, control valve, cylinder, and oil lines — with OEM part numbers, not wiring-style circuit diagrams.
Document Quality
This is a scanned parts manual, but it includes a searchable text layer, so you can find part numbers and descriptions throughout the document. The text quality is generally clear and readable in both the instructional pages and the parts lists. The exploded-view diagrams are raster images, meaning they are not vector-based and will become pixelated when zoomed in, but the callout numbers are legible at a normal viewing size. The pages are clean, with no handwriting, stains, or major scanning artifacts.
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