Description

Kubota 4520B, 4530B, L4520, L4530 Parts Catalog

Every time I see a guy ordering the wrong main frame bushings because he used a scanned aftermarket parts list, I want to throw a torque wrench at the wall. That wasted three days and double freight cost. For Kubota backhoes – specifically the Kubota 4520B, 4530B, L4520, L4530 – you need the exact OEM part number. This 50-page Parts Catalog gives you the factory breakdown straight from the folks who built the machine. No photocopied blur, no crossed-out supersessions. If you are wrenching on a 4520B or 4530B and need to know which valve goes in the console assembly, this is the document.

Hydraulic Cylinder Breakdowns: Factory Part Numbers

Eight separate cylinder assemblies are covered in this catalog – swing cylinder, dipperstick cylinder, bucket cylinder, stabilizer cylinder, boom cylinder. Each one gets its own section with exploded diagrams and part callouts. The 4520B stabilizer cylinder uses part 70020-01217 (2×10 hydraulic cylinder), while the 4530B stabilizer cylinder uses 70030-01248 (2×14-1/2 hydraulic cylinder). That difference matters when the hose fitting threads are different diameters. Page 4 of the catalog shows the main frame assembly with the stabilizer options listed right next to each other. You order the wrong one and the pin bores won’t line up.

Console Valve Assembly: Why OEM Matters

The console valve assembly section (reference 01I012) lists every spool, spring, and seal. Aftermarket catalogs lump the valve bracket and mounting plate together. This OEM catalog separates the right valve bracket (70030-01332) from the left valve bracket A (70030-01333), and the valve mounting plate (70030-01335). If you are rebuilding the control valve stack on a L4520 or L4530 backhoe, you need these individual numbers. I’ve seen guys buy a whole console because they couldn’t find the right bracket. That’s $400 down the drain. This catalog stops that.

3 Reasons to Use the OEM Parts Catalog

• Every part number is verified against Kubota’s master database – not some third-party list that was typed from a blurry photo.
• Exploded views show orientation and quantity. For example, the main frame assembly uses two ball bushings (70020-00076, 1-1/2 ID). The drawing shows exactly where they press in.
• Mounting kit sections (B-4521, L-4523, B-4524, L-4525, B-4526, L-4531) are included. These are often lost in other catalogs.

Does This Manual Cover the 4520B and 4530B?

Yes, and the L4520 and L4530 variants as well. The catalog uses B/L4520B and B/L4530B references throughout, meaning the same parts book applies to both the loader-backhoe models and the standalone backhoes. You’ll find separate sections for the 4250B boom assembly (page 2) and the 4530B boom assembly. The dipperstick and bucket assembly is shared between the 4520B and 4530B. If you need the mounting kit for a B-4521 frame, it’s right there on the TOC. No cross-referencing required.

50 Pages of Exploded Views and Specs

This is not a service manual – it is a pure parts catalog. Each page shows a numbered exploded view with a corresponding parts list. The 4520B & 4530B main frame assembly alone has 73 reference numbers on page 3, covering everything from the console cover (70030-01330) to the stabilizer assembly (70020-01262 for 4520B, 70030-01249 for 4530B). The gear pump sections break down into Cessna and Fenner-Stone variants for the 4530B. If you are replacing the hydraulic gear pump on a 4530B, you need to know which pump you have – the catalog tells you the exact part number for each.

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How do I know if a part number from this catalog is still current?

Kubota supersedes parts occasionally. This catalog was printed when these models were current. Check with your dealer or use the Kubota online parts lookup for the latest supersession. The catalog gives you the starting point.

Does this include torque specs for the valve assembly bolts?

No. This is a parts catalog, not a service manual. It tells you which bolts, not how tight. For torque values you need the factory shop manual. But the part numbers here are the ones you order.

If you are tired of guessing which stabilizer cylinder fits your 4520B or 4530B, stop ordering blind. Access the Factory Manual from AutoRepairManuals and get the OEM part numbers that match your machine’s serial number. Your parts counter guy will thank you.

External references: Automotive Industry Overview”>Automotive Industry Overview and Automotive Industry Overview”>Automotive Industry Overview.