Part of the Kubota Parts Manuals.
This is the Kubota parts catalog for the B1640A front loader, also covering the B1630, 40, and 40A loader variants, a 26 page illustrated parts book. It documents the loader attachment: the sub-frame and mounting components, tractor and loader hydraulics, lift frames, the single lever control, the control valve and pressure relief cartridge, and the lift and bucket cylinders.Each assembly is shown as an exploded diagram keyed to Kubota part numbers and quantities, with early and late hydraulic and cylinder parts split by serial number so you order the correct version for your machine.Use it to identify cylinder seal kits, control valve and spool parts, pivot pins, bushings, hoses, and fittings when rebuilding or resealing the loader. Delivered as a downloadable, printable PDF you can keep on the bench or on a phone in the shop.
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
Loader arms drift down when parked
Lift arms or bucket that slowly settle in neutral usually mean worn lift cylinder seals or internal valve leakage. The Lift Cylinder section shows the barrel, rod, piston, and seal parts.
Manual Section: Lift CylinderCylinder leaks at the rod
External leaks at the rod ends come from aged rod seals and wipers or a scored rod. The Bucket Cylinder section lists the cylinder rod, piston, and seal components.
Manual Section: Bucket CylinderLoader will not lift or lifts slowly
Weak or slow lifting can trace to the loader hydraulic supply, restricted flow, or worn components. The Loader Hydraulics section covers the cylinders, lines, and fittings.
Manual Section: Loader HydraulicsWeak lift from relief valve issues
Overworking or a faulty relief setting limits lifting power and can overheat the system. The Pressure Relief Cartridge section shows the cartridge, spring, and seal parts.
Manual Section: Pressure Relief CartridgeFrame or pivot slop and clunking
Wear in pivot pins, bushings, and retaining hardware causes play and noise in the loader frame. The Lift Frames and Components section identifies these parts.
Manual Section: Lift Frames & ComponentsBucket curl jerks or hesitates
A single lever control that jerks or sticks often means a worn spool or contaminated fluid. The Single Lever Control section breaks down the valve and linkage parts.
Manual Section: Single Lever ControlFrequently Asked Questions
Which loader models does this parts catalog cover?
It covers the Kubota B1640A front loader, with parts shared across the B1630, 40, and 40A variants. Part numbers throughout apply to these loaders.
Is this a parts catalog or a repair manual?
It is a parts catalog with exploded diagrams and Kubota part numbers for identifying and ordering loader components. It does not contain step-by-step repair procedures.
Does it list cylinder rebuild and seal parts?
Yes. The Lift Cylinder and Bucket Cylinder sections show the barrel, rod, piston, head gland, rod wiper, and rod seal parts you need to reseal a leaking cylinder.
How does it handle early versus late loader versions?
The hydraulic and cylinder parts are split by serial number range, so you match the early or late version to your loader before ordering.
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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