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 covers 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 | Label Danger French, Label Caution French, Bolt, Washer |
| Side Frame | 6-7 | Label Danger French, Label Warning French, Label Lubricate English, Label Lubricate Fren French |
| Boom | 8-9 | Fitting Grease, Label Kubota, Label Leveler, Label Leveler French French, Fitting Grease -28T.T |
| Control Valve | 10-11 | Assy Adapter, Assy Elbow Adjustabl, Throttle, Nipple |
| Control Valve [R/V] | 12-13 | Assy Adapter, Assy Elbow Adjustabl, Throttle, Nipple |
| Control Valve [Component Parts] | 14-15 | O Ring, Ring Back Up, Seat Relief Valve, Spring Relief |
| Control Lever | 16-17 | Bush, Joint Rod End, Grip Lever, Bolt |
| Control Lever [R/V] | 18-20 | Assy Cable, Cable 1250MM, Rubber Bellows, Bolt |
| 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, Adapter, Band Code, Block Hydraulic, O Ring, Sleeve |
| 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 boom cylinder seal kit part number does the Kubota LA403 use?
Check the exploded view on page 27 for the correct Kit 1 Seal part number. Page 28 also lists the 1/8-27NPTF grease fitting to keep that lubrication point covered during reassembly.
What control cable length spec does the Kubota LA403 use, and where is the part number?
The replacement cable for the LA403 control lever measures 1250mm in length, as shown on page 20. The routing diagram on page 18 also shows the correct M16*1.5 thread size nut and rubber bellows part numbers.
Where are the control valve detent plug kit part numbers in this catalog?
The control valve breakdown on page 14 lists the detent plug kit part number. Order the 0.1mm shims called out on page 15 at the same time and verify them against your original valve body before placing the order.
What format is this 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 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.
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