Part of the Kubota Parts Manuals.
This is the Kubota parts catalog for the B/L4520B and L4530B backhoe attachments, a 50-page PDF you download and keep. It breaks each backhoe into its assemblies: the main frame, boom, dipperstick and bucket, the tank and pump, gear pumps, console valve, and every hydraulic cylinder, each shown as an exploded diagram with Kubota part numbers.Use it to pin down the exact component before ordering. Match a worn cylinder, seal, pin or valve part to its number, and check which model a part applies to, since the catalog calls out 4520B and 4530B parts separately where they differ.It also covers the swing, stabilizer, boom and bucket cylinders, the hoses and fittings, and the tractor mounting kits, so it is the reference for identifying parts on any B/L4520B or L4530B backhoe repair.
What's Inside This Kubota BL4520B, L4530B Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Hydraulics & 3-Point Hitch | 4520B Tank & Pump Assembly, 4530B Tank & Pump Assembly, 4520B Gear Pump Assembly, 4530B Cessna Gear Pump Assembly, 4530B Fenner-Stone Hydraulic Gear Pump Assembly, 4520B & 4530B Console Valve Assembly, 4520B & 4530B Valve Controls & Hardware, 4520B & 4530B Swing Cylinder, 4520B Dipperstick & Bucket Cylinder 4530B Bucket Cylinder, 4520B Stabilizer Cylinder, 4530B Stabilizer Cylinder, 4520B Boom Cylinder 4530B Boom & Dipperstick Cylinder | |
| Body & Operator Station | 4520B & 4530B Main Frame Assembly | |
| Other Components | 4250B Boom Assembly, 4530B Boom Assembly, 4520B & 4530B Dipperstick & Bucket Assembly, 4520B Hoses & Fittings, 4530B Hoses & Fittings, Mounting Kit B-4521, Mounting Kit L-4523, Mounting Kit B-4524, Mounting Kit L-4525, Mounting Kit B-4526, Mounting Kit L-4531 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 4520B GEAR PUMP ASSEMBLY | ||
| Torque for (8) capscrews | 33-38 N-M/25-28 Ft. Lbs. | p. 19 |
| All Models | ||
| Ball Bushing ID | 1.5 inches | p. 4 |
| Pitch (Console Valve) | 8mm x 1.25mm | p. 26 |
| Tie Rod (Swing Cylinder) | 7/16 NF x 16 | p. 30 |
| Hydraulic Cylinder (Dipperstick/Bucket) | 2 x 16.75 inches | p. 32 |
| 4520B | ||
| Hydraulic Cylinder (Stabilizer) | 2x10 inches | p. 4 |
| Capscrew Torque (Gear Pump) | 33-38 N-M / 25-28 Ft. Lbs. | p. 19 |
| 4530B | ||
| Hydraulic Cylinder (Stabilizer) | 2x14.5 inches | p. 4 |
| Key Dimension (Cessna Gear Pump) | 1/4 x 1/4 x 15/16 inches | p. 22 |
| 4250B | ||
| Hydraulic Cylinder (Boom) | 2.5x16.75 inches | p. 6 |
| B/L4527B | ||
| Bucket Size (Standard) | 10 BH | p. 10 |
| L-4523 | ||
| Lock Pin (Mounting Kit) | 3/4 x 11 inches | p. 42 |
Kubota BL4520B, L4530B Common Problems This Manual Covers
One joystick side works, the other does not
A common complaint is that one control moves the backhoe normally while the other is weak or dead. This usually points to a spool, seal or section fault inside the console valve.
Manual Section: 4520B & 4530B Console Valve Assembly p. 25Boom or dipper motion is jerky or drifts
Delayed, jerky, or drifting cylinder movement typically means worn seals or internal leakage. The boom and dipperstick cylinder diagrams show the seal and rod parts you need for a rebuild.
Manual Section: 4520B Boom Cylinder 4530B Boom & Dipperstick Cylinder p. 37Loss of hydraulic pressure or noisy pump
Pressure loss, whining, or overheating often traces to the pump and tank assembly. This section covers the filter, tank and pump-drive parts to check first.
Manual Section: 4520B Tank & Pump Assembly p. 15Swing function weak or leaking
The swing cylinder takes heavy side loads and can leak or lose power over time. The exploded view identifies the tie rod, seals and cylinder parts by number.
Manual Section: 4520B & 4530B Swing Cylinder p. 29Leaks at hoses and fittings
Weeping connectors and cracked hoses are a routine source of pressure loss. The hoses and fittings section lists each connector and fitting so you can order exact replacements.
Manual Section: 4520B Hoses & Fittings p. 11Bucket cylinder seal wear
A bucket cylinder that will not hold load or seeps oil usually needs new seals. Match the collar and cylinder components from this section before rebuilding.
Manual Section: 4520B Dipperstick & Bucket Cylinder 4530B Bucket Cylinder p. 31Frequently Asked Questions
Which backhoe models does this catalog cover?
It covers the Kubota B/L4520B and L4530B backhoe attachments. Where the two differ, the catalog lists their parts separately, such as the two gear-pump variants used on the 4530B.
What is the torque for the gear pump capscrews?
The 4520B gear pump assembly specifies 33 to 38 N-m, or 25 to 28 ft-lbs, for its eight capscrews. That value is called out directly on the gear pump page. p. 19
Does it include the tractor mounting kits?
Yes. The catalog covers mounting kits B-4521, L-4523, B-4524, L-4525, B-4526 and L-4531, each with its own diagram and hardware list for fitting the backhoe to the tractor. p. 39
How soon do I get the manual?
You download it right after checkout. There is no shipping; the file is delivered instantly to your account and is yours to keep and re-download.
How quickly can I access this manual after buying?
A 50-page Parts Catalog in searchable PDF, downloadable the moment checkout finishes. Open it on a computer, tablet, or phone. No shipping wait.
Can I print this Kubota BL4520B manual?
No DRM restrictions. Print whatever sections you need for the shop. Standard letter or A4 paper works fine.
Does this Kubota B/L4520B, L4530B manual include hydraulic schematics?
This is a parts catalog, so it shows exploded parts diagrams rather than circuit schematics. It includes detailed exploded views of the hydraulic components, pump, control valve, cylinder, and oil lines, with OEM part numbers, not wiring-style circuit diagrams.
Does this catalog cover both Cessna and Fenner-Stone gear pumps for the 4530B?
Yes. The 4530B has two gear pump variants in separate sections: Cessna Gear Pump Assembly (p. 21) and Fenner-Stone Hydraulic Gear Pump Assembly (p. 23). The 4520B Gear Pump Assembly is on p. 19. Match the pump housing to the correct exploded view before pulling part numbers.
What stabilizer cylinder sizes are listed for the 4520B and 4530B?
The 4520B stabilizer cylinder measures 2x10 inches; its parts list is on p. 33. The 4530B uses a larger 2x14.5-inch cylinder with its exploded view starting on p. 35. Collar and assembly part numbers differ between models, so confirm your machine before ordering.
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