Part of the Kubota Parts Manuals.
This is the factory parts catalog for the Kubota B1630 front loader, publication number 100Z0002, covering the B1630 and B1640/A loader assemblies. It is a 34 page PDF with a searchable text layer, so you can look up part numbers and copy them straight into an order.Inside you get exploded diagrams and Kubota part numbers for the sub-frame and mounting components, the tractor and loader hydraulics, the single lever control valve, the pressure relief cartridge, and the lift and bucket cylinders. Parts are split by serial number range, so you can match the correct hydraulics and cylinders to your machine.Owners and independent mechanics use it to identify the exact replacement part, rebuild a leaking lift or bucket cylinder, and order seals, fittings, and hardware without guessing. Optional round back bucket sizes are listed as well.
What's Inside This Kubota B1630 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| B1633 Sub-Frame & Components | - | Upright, Sub-Frame Assy, Label Caution, Label Warning, Label Control, Front Bracket, Rear Mount, Belly Brace |
| B1634 Sub-Frame & Components | - | Upright, Sub-Frame Assy, Label Caution, Label Warning, Label Control, Rear Mount, Belly Brace, Front Bracket |
| B1635 Sub-Frame & Components | - | Upright L.h. W/ O, Upright R.h. W/ O, Sub-Frame Assy, Label Caution, Label Warning, Label Control, Rear Mount, Bracket L.h |
| B1639 Sub-Frame & Components | - | Upright, Sub-Frame Assy, Label Caution, Label Warning, Label Control, Rear Mount, Bracket L.h, Bracket R.h |
| B1633&39 Tractor Hydraulics | - | Fitting Return Oil, Hose, Fitting, Cap |
| B1634&35 Tractor Hydraulics | - | Fitting Return Oil, Delivery Pipe, Hose, Fitting, Diverter Block, Filler Cap, Obtain Locally |
| B1630 40 & 40A Lift Frames & Components | - | Lift Frame Assy, Pivot Pin Special, Hair Pin Clip, Obtain Locally, Indicator, Rod, Bucket Rnd Back, Label Kubota |
| B1630 40 & 40A Single Lever Control | - | Control Valve Two, Yoke, Bushing, Clevis Special, Cover, Long Link, Short Link, Lock Link |
| B1630 40 & 40A 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 B1630 <=22004921 B1640/A <=24005472 | - | Lift Cylinder, Bucket Cylinder, Steel Line Short, Steel Line Long, Fitting, Orifice Plate, Pivot Pin Special, Hairpin Clip |
| Loader Hydraulics B1630 =>22004922 B1640/A =>24005473 | - | Lift Cylinder, Bucket Cylinder, Steel Line Short, Steel Line Long, Fitting, Orifice Plate, Pivot Pin Special, Hairpin Clip |
| Lift Cylinder B1630 <=2004921 B1640/A <=244005472 | - | Barrel, Rod, Piston, Head Gland, Lube Fitting, Internal Snap Ring, Rod Wiper, Rod Seal |
| Bucket Cylinder B1630 <=22004921 B1640/A <=2005472 | - | Cylinder Barrel, Cylinder Rod, Piston, Head Gland, Lube Fitting, Retaining Wire, Rod Wiper, Rod Seal |
| Lift Cylinder B1630=>22004922 B1640/A =>24005473 | - | Barrel, Rod, Piston, Head Gland, Lube Fitting, Internal Snap Ring, Rod Wiper, Rod Seal |
| Bucket Cylinder B1630=>22004922 B1640/A=>24005473 | - | Cylinder Barrel, Cylinder Rod, Piston, Head Gland, Lube Fitting, Retaining Wire, Rod Wiper, Rod Seal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Filler Cap (06314-60060) Weight | 0.029 kgf | p. 12 |
| 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 leaks or settles
A worn rod wiper or rod seal lets the loader drift down or leak oil at the cylinder head. The lift cylinder breakdown identifies the barrel, rod, piston, head gland, and seals you need to rebuild it.
Manual Section: Lift Cylinder B1630 <=2004921 B1640/A <=244005472Bucket cylinder seal leak
Oil weeping past the bucket cylinder rod seal causes slow curl and loss of holding power. This section lists the cylinder barrel, rod, piston, retaining wire, and rod seals for a full reseal.
Manual Section: Bucket Cylinder B1630 <=22004921 B1640/A <=2005472Weak or slow loader hydraulics
Loss of lift speed often traces to worn steel lines, fittings, or a failed orifice plate in the loader circuit. This section shows the hoses, fittings, and orifice plate for the correct serial range.
Manual Section: Loader Hydraulics B1630 <=22004921 B1640/A <=24005472Loader will not hold pressure
A leaking or worn pressure relief cartridge lets the loader bleed down under load. The cartridge breakdown lists the seal kit, tamperproof cap, back-up ring, and spring housing needed to service it.
Manual Section: Pressure Relief CartridgeControl valve sticking or leaking
A sticking spool or external leak at the single lever control valve causes erratic loader response. This section lists the valve, seal kit, detent kit, and relief cartridge to repair or rebuild it.
Manual Section: B1630 40 & 40A Control ValveLoose or damaged sub-frame mounts
Cracked brackets or loose mounting hardware on the sub-frame let the loader shift under load. The sub-frame breakdown identifies the uprights, front bracket, rear mount, and belly brace to replace.
Manual Section: B1633 Sub-Frame & ComponentsFrequently Asked Questions
Which machines does this parts catalog cover?
It covers the Kubota B1630 and B1640/A front loaders under publication 100Z0002, listing the sub-frame, lift frame, control valve, pressure relief cartridge, and lift and bucket cylinder assemblies with Kubota part numbers.
What optional buckets are listed?
Page 16 lists optional round back buckets in 42, 48, and 54 inch widths, so you can identify and order the correct bucket for your loader. p. 16
Which parts do I need to rebuild the lift cylinder?
The lift cylinder section lists the barrel, rod, piston, head gland, internal snap ring, rod wiper, and rod seal, with a 3/4-16 locknut shown on page 28 for reassembly. p. 28
How do I order the right part for my serial number?
Each listing shows an S.No. serial range column. The loader hydraulics and cylinders split at serials 22004921 and 22004922, so check your machine's number before ordering.
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 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.
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