Part of the Kubota Parts Manuals.
This is the Kubota LA300 front loader parts catalog, a 25 page illustrated PDF that breaks the loader down into its exact factory assemblies. It covers the main frame, boom, hydraulic oil pressure circuits, the control valve, and the boom and bucket cylinders, plus the optional front guard and service accessories.Each section pairs an exploded diagram with a numbered parts list carrying Kubota part numbers, quantities, and serial number ranges. Both boom and bucket cylinder groups are split by serial number, so you can order the exact cylinder parts that fit your machine.Use it to identify cylinder seal kits, hoses, fittings, pins, and frame hardware for repairs like a boom that will not raise, a loader that drifts down, or a body stuck on the subframe. Every part traces back from the diagram to a specific reference number and Kubota part number.
What's Inside This Kubota LA300 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Main Frame | 4-5 | HST Type Model Details, RC54-8, RC50-B Model Details, RC48-62H, RC60-72H Model Details |
| Boom | 6-7 | Boom Diagram, Boom Parts List |
| Oil Pressure (1) | 8-9 | Oil Pressure (1) Diagram, Oil Pressure (1) Parts List |
| Control Valve [Component Parts] | 10-11 | Control Valve Component Parts Diagram, Item 050 Not Showing in Figure, Control Valve Component Parts List |
| Cylinder 1 (Boom) [Component Parts] | 12-15 | Serial Number Greater Than or Equal to 11724 |
| Cylinder 2 (Bucket) [Component Parts] | 16-19 | Cylinder 2 (Bucket) Component Parts Diagram, Cylinder 2 (Bucket) Component Parts List, Interchangeability Symbols Legend, Serial Number Greater Than or Equal to 11724 |
| Oil Pressure (2) | 20-21 | Oil Pressure (2) Diagram, Oil Pressure (2) Parts List |
| Front Guard [Option] | 22-24 | Front Guard Option Diagram, Front Guard Option Parts List, Interchangeability Symbols Legend, Image Not Available |
| Accessories and Service Parts | 25 | List, Remarks for Items 030 to 070 |
Every system also includes interchangeability symbols legend.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder 1 (Boom) serial number range | <=11723 | p. 9 |
Kubota LA300 Common Problems This Manual Covers
Loader will not raise or lower
The bucket or boom fails to move normally when hydraulic flow is restricted by a stuck coupler, damaged hose, or air in the system. The oil pressure circuit lines are itemized with part numbers.
Manual Section: Oil Pressure (1) p. 8Boom drifts down under load
The loader arms slowly settle when the lift cylinder leaks internally past worn seals. The boom cylinder breaks down into its individual components, with separate parts for later serial number machines.
Manual Section: Cylinder 1 (Boom) [Component Parts] p. 12Weak or uneven bucket action
The bucket curls or dumps unevenly when a bucket cylinder loses pressure through leaking seals. The bucket cylinder is diagrammed down to its seal parts for a rebuild.
Manual Section: Cylinder 2 (Bucket) [Component Parts] p. 16Loader sticks on the subframe
The loader side frame can seize in the tractor subframe during removal from corrosion or debris at the mount points. The sub frame, connectors, and locking hardware are listed as individual parts.
Manual Section: Main Frame p. 4Valve fails to hold pressure
Poor lift control or a boom that drops can trace to worn valve spools or internal valve components. The control valve component parts are broken out individually for replacement.
Manual Section: Control Valve [Component Parts] p. 10Leaks or loose grease fittings
Hydraulic oil around fittings and the control lever area often means worn seals or loose hardware in the return circuit. The levers, clips, and grease fittings are listed with part numbers.
Manual Section: Oil Pressure (2) p. 20Frequently Asked Questions
Which machine does this parts catalog cover?
It covers the Kubota LA300 front loader. Parts are grouped by assembly with exploded diagrams and Kubota part numbers, and many lists include serial number columns so you can pick the correct version for your machine.
Does it note serial number differences for the boom cylinder?
Yes. The Cylinder 1 (Boom) section separates parts for machines at or above serial number 11724, so early and later LA300 loaders both get the correct cylinder components. p. 12
Can I find the bucket cylinder seals?
Yes. The Cylinder 2 (Bucket) component parts section breaks the bucket cylinder into its tube, rod, head, piston, and seal parts with Kubota part numbers for a rebuild. p. 16
Are the optional front guard parts included?
Yes. The Front Guard option section lists the guard kit and its mounting hardware, so you can identify and order the front guard parts if your loader is fitted with it. p. 22
How quickly can I access this manual after buying?
The 25-page searchable PDF downloads the moment your checkout clears. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Can I print specific sections of this Kubota LA300 Parts Catalog?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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