Every assembly on the LA300 gets its own exploded view here: main frame, boom, the control valve, both oil pressure circuits, and the boom and bucket cylinders. Parts lists run ref numbers alongside part numbers, quantities, and interchangeability codes. The main frame section splits across five variants (HST Type, RC54-8, RC50-B, RC48-62H, and RC60-72H), so you can match your exact build instead of guessing. Cylinder parts divide at serial number 11724, with separate drawings for units above and below that cutoff. Beyond the core assemblies, the catalog also maps the optional front guard and the accessories and service parts list at the back. Check your serial number first and you order right the first time. Bookmarked sections drop you onto the assembly you need in seconds, and the searchable PDF opens on your phone right at the workbench.
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 | 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 | 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 |
|---|---|---|
| HEX.BOLT(M10*1.25*35) weight | 0.031 kgf | p. 5 |
| HEX.BOLT(M10*1.25*50) weight | 0.038 kgf | p. 5 |
| WASHER PLAIN(3/8) weight | 0.03 kgf | p. 5 |
| WASHER SPRING LOCK(9/16) weight | 0.08 kgf | p. 5 |
| WASHER PLAIN(9/16) for MOWER ONLY weight | 0.009 kgf | p. 5 |
| HEX.BOLT(M12*1.25*25) weight | 0.035 kgf | p. 7 |
| WASHER SPRING LOCK(5/16) weight | 0.002 kgf | p. 7 |
| HEX.BOLT(5/16-18UNC*) weight | 0.01 kgf | p. 7 |
| HEX.NUT(3/8-24UNF) weight | 0.006 kgf | p. 9 |
| CYLINDER 1 (BOOM) serial number range | <=11723 | p. 9 |
| GRIP LEVER weight | 0.05 kgf | p. 21 |
Kubota LA300 Common Problems This Manual Covers
Need the correct replacement Kubota LA300 boom cylinder internal components because the bucket won't lift p. 12
Pull up the boom cylinder exploded view on page 12. Confirm your loader serial number first, since part numbers split at serial number 11724. Then read the gland and rod listings to pin down the exact seal kit for your unit.
Manual Section: Cylinder 1 (Boom) [Component Parts]Cannot identify the missing mounting bolts and washers after the loader side frame gets stuck during removal p. 5
Trace the frame hardware on the chassis diagram on page 4. The matching parts list on page 5 gives you the HEX.BOLT(M10*1.25*35) at 0.031 kgf. Order the washers and nuts in the assembly sequence shown.
Manual Section: Main FrameHaving trouble sourcing the correct replacement lever and grip when the hydraulic system runs jerky p. 21
Review the control valve components and linkage diagram on page 20. Locate the specific grip lever assembly, which is listed with a weight of 0.05 kgf on page 21. Match the reference numbers from the drawing to the parts list to secure the exact replacements.
Manual Section: Oil Pressure (2)Unsure which replacement hydraulic hoses and hex nuts to order for a leaking main pressure line p. 8
Open the hydraulic parts diagram on page 8 to trace the hose routing. Match the leaking fitting against the page 9 list, where the HEX.NUT(3/8-24UNF) weighs 0.006 kgf. Cross-check the item numbers so the threaded connections you order actually fit.
Manual Section: Oil Pressure (1)Frequently Asked Questions
What are the replacement specifications for Hydraulic hoses?
Hydraulic hoses are listed by part number and quantity. In OIL PRESSURE (1), for instance, you'll find ASSY HOSE 1 HYDRAULI (Part No. 75532-66100, Q'ty 4) and HOSE 1 HYDRAULIC (Part No. 75532-66110, Q'ty 4). The section also covers HOSE 8 HYDRAULIC (Part No. 75532-66610, Q'ty 2) and HOSE 9 HYDRAULIC (Part No. 75532-66620, Q'ty 2).
Which boom cylinder seal kit fits my LA300 when the bucket won't lift?
Check the boom cylinder exploded view on page 12. Part numbers split at serial number 11724, so confirm your loader serial before ordering. The gland and rod listings identify the exact seal kit for your unit.
How do I identify the mounting bolts and washers for the LA300 loader side frame?
The frame hardware diagram is on page 4 and the matching parts list is on page 5. The HEX.BOLT(M10*1.25*35) weighs 0.031 kgf. Order the washers and nuts shown in the assembly sequence to get the correct fasteners.
What part number is the hydraulic control grip lever on the LA300?
The control valve linkage diagram is on page 20 and the grip lever assembly is listed on page 21 with a weight of 0.05 kgf. Match the reference numbers from the drawing to the parts list to confirm the exact part before ordering.
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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