Part of the Kubota Parts Manuals.
This is the factory parts catalog for the Kubota BL4520 backhoe, a 31-page illustrated PDF ready to download and print. It documents the attachment assembly by assembly, with an exploded diagram beside each parts list showing reference numbers, Kubota part numbers, quantities, and serial-number ranges.The catalog covers the main frame assembly, boom, bucket and dipperstick, hoses and fittings, the tank and pump, gear pump, valve control linkage and plumbing, the valve assembly with its seal kits, every hydraulic cylinder (swing, dipperstick and bucket, stabilizer, and boom), and the L-4525 and L-4522 mounting kits used to fit the backhoe to a tractor.Use it to pin down the exact replacement part from the drawing, order the right seal kit for a leaking cylinder or valve, and check serial-range interchangeability before buying. It identifies parts; it is not a step-by-step service manual.
What's Inside This Kubota BL4520 Parts Manual
| System | Pages |
|---|---|
| Main Frame Assembly 4520 | - |
| Boom Assembly | - |
| Bucket & Dipstick Assembly | - |
| Hoses & Fittings | - |
| Tank & Pump Assembly | - |
| Gear Pump | - |
| Valve Control Linkage & Plumbing | - |
| Valve Assembly | - |
| Swing Cylinder | - |
| Dipperstick & Bucket Cylinder | - |
| Stabilizer Cylinder | - |
| Boom Cylinder | - |
| Mounting Kit L-4525 | - |
| Mounting Kit L-4522 | - |
Every system also includes seal kit.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Capscrew Torque | 33-38 N-M/25-28 Ft. Lbs. | p. 14 |
| Hose Size (replacement) | 9/16-18 X 1/4 NPT | p. 11 |
| Fitting Size (replacement) | 9/16 FLARE X 1/2 X 1 | p. 13 |
| 8 CAPSCREWS Torque | 33 N-M | p. 14 |
| Ball ID (REF.No 9) | 1.5 inches | p. 4 |
| Pivot Pin Length (REF.No 12) | 5.875 inches | p. 4 |
| Cotter Pin Diameter (REF.No 36) | 0.09375 inches | p. 4 |
| Hex Bolt Thread Size (REF.No 39) | 1/4 NC X 3/4 | p. 4 |
| Clevis Pin Length (REF.No 41) | 1.875 inches | p. 4 |
Kubota BL4520 Common Problems This Manual Covers
One backhoe function weak or dead
A common BL4520 complaint is one stick or function working well while another is weak or unresponsive, usually a spool or valve section fault. The valve assembly breakdown identifies the valve body, spool, and seal kit parts.
Manual Section: Valve Assembly p. 18Slow, jerky, or weak hydraulics under load
Worn hoses, loose fittings, or leaks make the backhoe slow and jerky and cost it power. The hoses and fittings section diagrams the lines so you can trace and replace the right one.
Manual Section: Hoses & Fittings p. 10Oil leaks around the plumbing
Weeping fittings and worn valve connections leave visible oil around the backhoe plumbing and drop the fluid level. The valve control linkage and plumbing section lays out the fittings and connections for identification.
Manual Section: Valve Control Linkage & Plumbing p. 16Leaking dipperstick or bucket cylinder
Worn rod seals and piston seals let the dipperstick or bucket cylinder bypass and leak. The cylinder breakdown lists the full seal kit so you can order the correct rebuild parts.
Manual Section: Dipperstick & Bucket Cylinder p. 22Gear pump wear and low pressure
A worn gear pump loses output and leaves every function feeling weak. The gear pump section diagrams the pump and its seal kit for inspection and part ordering.
Manual Section: Gear Pump p. 14Mounting the backhoe to the tractor
Fitting or removing the backhoe means matching the correct mounting hardware to your tractor. The L-4525 mounting kit section identifies the bolts, nuts, and brackets with their part numbers and weights.
Manual Section: Mounting Kit L-4525 p. 28Frequently Asked Questions
What does this catalog cover?
It covers the Kubota BL4520 backhoe attachment, including the main frame, boom, cylinders, hoses and fittings, the tank, pump and gear pump, the valve assembly, and the L-4525 and L-4522 mounting kits.
Does it list a capscrew torque value?
Yes. The gear pump section gives the capscrew torque of 33-38 N-M (25-28 Ft. Lbs.) for that assembly, alongside the exploded diagram and parts list. p. 14
Are cylinder and valve seal kits included?
Yes. The valve assembly section breaks out the seal kit and valve section components, and each hydraulic cylinder section lists its own seal kit parts for a rebuild. p. 18
Where do I find the correct replacement hose size?
The hoses and fittings section diagrams the lines and lists replacement sizes, such as the 9/16-18 X 1/4 NPT hose fitting, so you can order the exact part. p. 10
What do I get after purchasing this Kubota BL4520 manual?
A 31-page Parts Catalog in searchable PDF, ready the moment checkout completes. Read it on a computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Kubota BL4520 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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