Part of the Kubota Parts Manuals.
Twenty-six pages of OEM #100Z0007 exploded views aimed at one outcome: ordering the right loader part on the first try. You'll work through Sub-Frame, Tractor Hydraulics, Lift Frames, Single Lever Control, Control Valve, Pressure Relief Cartridge, Loader Hydraulics, and the Lift and Bucket Cylinders. Parts lists and exploded-view callouts sit next to column-heading definitions that decode interchangeability and country codes before you pick up the phone. Mind the serial splits: early Loader Hydraulics covers B1630 up to 22004921 and B1640A up to 24005472, with late hydraulics starting at 22004922 and 24005473. Wrong cylinder seal, another week down. Pull the exact number, then call your dealer. Bookmarked by assembly, opens on laptop, tablet, or phone next to the machine.
What's Inside This Kubota B1640A, B1630, 40, 40A Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Sub-Frame & Components | - | Upright, Sub-Frame Assy, Label Caution, Label Warning, Label Control, Label Instruction, Rear Mount, Bracket |
| Tractor Hydraulics | - | Fitting Return Oil, Quick Coupler, Dust Cap Set, Hose, Adapter, Fitting, Nipple, Reducer |
| Lift Frames & Components | - | Lift Frame Assy, Pivot Pin Special, Hair Pin Clip, Obtain Locally, Indicator, Rod, Bucket Rnd Back, Label Kubota |
| Single Lever Control | - | Control Valve Two, Yoke, Bushing, Clevis Special, Cover, Long Link, Short Link, Lock Link |
| Control Valve | - | Kit Power Beyond, Kit Load Check, Kit Detent, Kit Spring, Relief Cartridge, Seal Kit, Cap Tamper Proof, Orifice Plate |
| Pressure Relief Cartridge | - | Seal Kit Both, Tamperproof Cap, Gasket Aluminum, Back-Up Ring, Locknut, Spring Housing, Flatwasher, Spring |
| Loader Hydraulics | - | Lift Cylinder, Bucket Cylinder, Steel Line Short, Steel Line Long, Fitting, Orifice Plate, Pivot Pin Special, Hairpin Clip |
| Lift Cylinder | - | Barrel, Rod, Piston, Head Gland, Lube Fitting, Internal Snap Ring, Rod Wiper, Rod Seal |
| Bucket Cylinder | - | Cylinder Barrel, Cylinder Rod, Piston, Head Gland, Lube Fitting, Retaining Wire, Rod Wiper, Rod Seal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| B1630 | ||
| Early Loader Hydraulics S/N Cutoff | <=22004921 | p. 15 |
| Late Loader Hydraulics S/N Start | =>22004922 | p. 17 |
| Early Lift Cylinder S/N Cutoff | <=2004921 | p. 19 |
| Early Bucket Cylinder S/N Cutoff | <=22004921 | p. 21 |
| Late Lift Cylinder S/N Start | =>22004922 | p. 23 |
| Late Bucket Cylinder S/N Start | =>22004922 | p. 25 |
| B1640A | ||
| Early Loader Hydraulics S/N Cutoff | <=24005472 | p. 15 |
| Late Loader Hydraulics S/N Start | =>24005473 | p. 17 |
| Early Lift Cylinder S/N Cutoff | <=244005472 | p. 19 |
| Early Bucket Cylinder S/N Cutoff | <=2005472 | p. 21 |
| Late Lift Cylinder S/N Start | =>24005473 | p. 23 |
| Late Bucket Cylinder S/N Start | =>24005473 | p. 25 |
Kubota B1640A, B1630, 40, 40A Common Problems This Manual Covers
B1640A lift cylinder seal kit part number needed, rams weeping at the rod end
Open the lift cylinder exploded view on page 19. For serial numbers at or below 24005472, work from the early cylinder breakdown. Match rod seal, wiper, and O-ring callouts against the parts list, then confirm your serial falls inside the <=24005472 range before ordering.
Manual Section: Lift Cylinder p. 19Can't identify bucket cylinder seal components for a re-seal on a drooping bucket
Reference the bucket cylinder breakdown starting on page 21. Early units use the diagram tied to the <=22004921 serial cutoff (B1630). Cross-check piston seal, rod seal, and backup ring callouts with the adjacent parts list, then confirm bore diameter against the listed dimension before pulling part numbers.
Manual Section: Bucket Cylinder p. 21Unsure which loader hydraulics diagram applies, early vs. late serial split
Start with the early loader hydraulics diagram on page 15. For B1630 serials at or above 22004922, jump to the late layout on page 17. Pull the machine serial off the frame tag first, then match it against the cutoff before ordering hoses, fittings, or manifold parts.
Manual Section: Loader Hydraulics p. 15Need part numbers for worn pivot pins and bushings in the lift frame, clunking under load
Pull the lift frame exploded view on pages 7 through 8. Every pivot pin, bushing, snap ring, and retaining bolt is balloon-numbered to the adjacent parts list. Measure pin diameter and length on the worn component, then match to the listed dimension before ordering replacements.
Manual Section: Lift Frames & Components p. 7Single lever control valve spool parts ID for sticky, jerky bucket response
Work the single lever control breakdown on pages 9 through 10. Spool, detent balls, springs, and seal kit callouts are itemized individually. For the valve body itself, cross to the control valve diagram on page 11. Order spool and seal kit together since they share a fitment tolerance.
Manual Section: Single Lever Control p. 9Pressure relief cartridge replacement part number needed, loader stalls under load
Go to the pressure relief cartridge diagram on page 13. Cartridge assembly, O-rings, and backup washers are itemized in the parts list on page 14. Check the pressure rating stamped on the old cartridge against the listed spec before ordering, since early and late builds may differ.
Manual Section: Pressure Relief Cartridge p. 13Frequently Asked Questions
What are the replacement specifications for hydraulic cylinder seal kits?
Lift Cylinder seal kit for the B1630 (S/N <=2004921) and B1640/A (S/N <=244005472) is part number 70050-02489. The matching Bucket Cylinder seal kit on the same models is 70050-93642. Each kit ships with the seals, wipers, and rings needed for a full cylinder rebuild. p. 20
What are the replacement specifications for control valve/spool components?
Several service kits are listed for the B1630, 40 & 40A control valve. Seal kit is 70050-01558, power beyond kit is 70050-01556, load check kit is 70050-01557, and detent kit is 70050-01559. The complete two-spool control valve assembly is 70050-01597. p. 12
Which loader hydraulics diagram applies to my serial number, early or late split?
Start with the early loader hydraulics diagram on page 15. For B1630 serials at or above 22004922, jump to the late layout on page 17. Pull the machine serial off the frame tag first, then match it against the cutoff before ordering hoses, fittings, or manifold parts. p. 15
What parts do I need to replace a pressure relief cartridge when the loader stalls under load?
Go to the pressure relief cartridge diagram on page 13. Cartridge assembly, O-rings, and backup washers are itemized in the parts list on page 14. Check the pressure rating stamped on the old cartridge against the listed spec before ordering, since early and late builds may differ. p. 13
How quickly can I access this manual after buying?
Instant download of the full 26-page searchable Parts Catalog. Open it on any device, laptop at the desk or phone out in the field.
Can I print specific sections of this manual?
No restrictions. The PDF is DRM-free, so print whatever sections you want to take to the shop. Standard letter or A4 paper handles it.
Are hydraulic system diagrams in this Kubota B1640A, B1630, 40, 40A manual?
Yes. The catalog includes exploded-view diagrams for the major hydraulic components, cylinders, control valves, and hose layouts, which is what you need for a rebuild parts list.
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