Need factory part numbers for your Kubota LA403 loader? This catalog runs 36 pages and covers every assembly from main frame to hydraulic block. Exploded views and individual part numbers span six systems: chassis, boom, control valve, control lever, hydraulic system, and accessories. The hydraulic section alone fills 14 pages of cylinders, hoses, tubes, and block components, each entry listing reference numbers, quantities, and country-code cross-references for the US, Canada, Australia, France, and three more markets. Confirm your 1/4-28T.T. grease fitting before ordering boom hardware, and match the 1250mm cable length against your current control lever before parts arrive. No more guessing at part numbers. Sections are bookmarked, so the PDF opens on any device and jumps straight to boom, hydraulics, or control valve without scrolling.
What's Inside This Kubota LA403 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Main Frame | 4-5 | Frame Main Lh(Label), Label Danger, Label Caution, Label Control, Washer Spring, Washer Plain |
| Side Frame | 6-7 | Frame Side Lh(Label), Pin Spring, Label Danger, Label Warning, Label Lubricate, Frame Side Rh(Label) |
| Boom | 8-9 | Stand, Hairpin Cotter, Fitting Grease, Label Kubota, Hex.Bolt |
| Control Valve | 10-11 | Stay Valve, Assy Valve Control, Assy Adapter, O-Ring, Assy Elbow Adjustabl, Cap Dust |
| Control Valve [R/V] | 12-13 | Assy Valve Control, Assy Adapter, O-Ring, Assy Elbow Adjustabl, Throttle, Cap Dust |
| Control Valve [Component Parts] | 14-15 | Assy Valve Control, Seal Dust, Kit Plug Detent, O Ring, Ring Back Up, Kit Valve Relief |
| Control Lever | 16-17 | Lever, Bush, Washer Spring, Lever Lock, Joint Rod End, Grip Lever |
| Control Lever [R/V] | 18-20 | Flange, Sleeve, Gasket, Cable, Controller, Rubber Bellows |
| Cylinder/Hydraulic Hose | 21-22 | Cylinder 1, Cylinder 2, Hose 8 Hydraulic, Hose 9 Hydraulic, Band Code |
| Hydraulic Hose(Hyd.Outlet Block) | 23-24 | Hose 1 Hydraulic, Hose 2 Hydraulic, Coupler, Plug Dust, Sleeve |
| Hydraulic Tube | 25-26 | Tube 1 Hydraulic, Tube 2 Hydraulic, Tube 3 Hydraulic, Tube 4 Hydraulic, Cover Clamp, Clamp 3 |
| Cylinder (Boom)[Component Parts] | 27-28 | Tube 1 Comp., Rod 1 Comp., Head 1, Piston 1, Kit 1 Seal |
| Cylinder (Bucket)[Component Parts] | 29-30 | Tube 2 Comp., Rod 2 Comp., Head 2, Piston 2, Kit 2 Seal |
| Hydraulic Block | 31-34 | Elbow 1, Adapter 1, Block Hydraulic, O-Ring, Hose 5 Hydraulic, Sleeve Return |
| Accessories and Service Parts | 35-36 | Operator'S Manual, Operators Manual Fr, Manual Supplement |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| NUT thread size | 5/16-24UNF | p. 17 |
| HEX.BOLT thread size | M6*1.00*55 | p. 17 |
| SHIM thickness | 0.1mm | p. 15 |
| CABLE length | 1250mm | p. 20 |
| FITTING GREASE thread size | 1/4-28T.T. | p. 9 |
| EDGE 2 CUTTING weight | 0.46 kgf | p. 9 |
| ASSY ELBOW ADJUSTABL weight | 0.11 kgf | p. 11 |
| KIT PLUG DETENT weight | 0.43 kgf | p. 15 |
| HOSE 7 HYDRAULIC weight | 0.62 kgf | p. 32 |
| COUPLER weight | 0.13 kgf | p. 24 |
Kubota LA403 Common Problems This Manual Covers
Can't find the correct boom cylinder seal kit part numbers when the Kubota LA403 loader will not lift p. 27
Check the exploded view on page 27 for the correct Kit 1 Seal part number, then confirm your cylinder tube and rod components match the diagram. Page 28 lists the 1/8-27NPTF grease fitting, so keep that lubrication point covered when you reassemble.
Manual Section: Cylinder (Boom)[Component Parts]Looking for replacement control cable part numbers after bucket or boom does not respond correctly to joystick input p. 18
Inspect the controller and cable routing diagram on page 18. Locate the exact part number for the replacement cable, verifying it matches the 1250mm length specification shown on page 20. Replace the damaged rubber bellows and secure the M16*1.5 thread size nut.
Manual Section: Control Lever [R/V]Trying to identify hydraulic outlet block quick coupler parts when loader stops working suddenly or moves partially p. 23
Trace the hydraulic hose layout on page 23 to pin down the coupler part number for the outlet block. Match the replacement to the 0.13 kgf weight on page 24, and order fresh dust plugs while you are in there to keep contamination out.
Manual Section: Hydraulic Hose(Hyd.Outlet Block)Need the control valve detent plug kit part number when loader movement is jerky or inconsistent under load p. 14
Locate the control valve breakdown on page 14 for the detent plug kit part number. Order the 0.1mm shims called out on page 15 at the same time, and double-check the parts against your original valve body before you place the order.
Manual Section: Control Valve [Component Parts]Frequently Asked Questions
What are the replacement specifications for hydraulic hoses?
Each hydraulic hose is listed with its part number and weight. HOSE 8 HYDRAULIC (Part No. 7J266-66610) weighs 0.36 kgf (0.792 lb) at a quantity of 4. The catalog also covers HOSE 1 HYDRAULIC (Part No. 7J048-66110), HOSE 2 HYDRAULIC (Part No. 7J048-66210), HOSE 9 HYDRAULIC (Part No. 7J048-66620), HOSE 5 HYDRAULIC (Part No. 7J048-76310), HOSE 7 HYDRAULIC (Part No. 7J048-76510), and HOSE 6 HYDRAULIC (Part No. 7J048-76410).
What format is this Kubota LA403 manual in?
It is a 36-page searchable PDF that downloads instantly after checkout. Open it on a laptop, tablet, or phone and bring it straight to the shop floor.
Can I print this Kubota LA403 manual?
Yes. Print as many copies as you need, with no restrictions. Plenty of mechanics run off just the section they are working on and keep it at the bench.
Document Quality
This document is a scanned PDF, not a native digital file. An OCR layer is present, allowing you to search and copy most of the text content, including tables. The text itself is generally crisp and readable, although not vector-sharp. All diagrams and illustrations are raster images, which means they may show pixelation when zoomed, but their labels are consistently clear and readable. The pages are clean, free from scan artifacts, stains, or skewed alignments, and there are no notable blank pages.
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