Description

Case 420B Parts Catalog

If you are working on a Case 420B and you need the right part number the first time, you don’t have time to guess. I’ve seen too many jobs get held up because a guy ordered the wrong bucket cylinder or a relief valve that didn’t match. That happens when you rely on aftermarket catalogs that re-use illustrations from a different model. This 68-page Parts Catalog is the original factory document – the same one a Case dealer would pull up. It lists every bolt, hose, valve, and seal by number. No ambiguity. You match the illustration to the machine, pull the part number, and order it. That’s it.

Every section is organized the way a mechanic thinks: loader first, then backhoe, with an alphabetically sorted index that dumps you straight to the right page. Need a bull dozer blade for the loader? Page 7. Looking for a boom cylinder for the backhoe? Page 51. The Numerical Index on page 53 lets you cross-reference any part number to its drawing, which saves you from flipping through the whole book when you have a number from an old tag.

Loader Section: Buckets, Frames, and Lift Arms

The loader section covers everything from the bucket to the counterweight. Pages 4 through 30 detail buckets, frames, lift arms, cylinders (lift and bucket), hydraulics, pump, pump drive, control valves, relief valves, hoses, tubes, and mounting parts. Each subsection breaks out the individual components with part numbers. For instance, the lift cylinder group on page 21 gives you the complete cylinder assembly plus seal kit numbers. If you have a leak, you can order the exact seals instead of swapping the whole cylinder. That’s real money saved.

Backhoe Hydraulics: Hoses, Tubes, and Valves

The backhoe section starts on page 34 and runs through page 52. It covers arms, buckets, and every cylinder: boom (page 51), dipper arm (50), dump (52), stabilizer (49), and swing (48). Hydraulics are split into two groups: swing and stabilizer cylinders on page 40, and boom, dipper arm, and dump cylinder hydraulics on page 42. Each group includes the control valves, relief valves (page 19), and the flow control valve (page 45). The hose and tube routing is shown in the same drawing that includes the part numbers – so you are not guessing which length goes where. If you are rebuilding the backhoe plumbing, this is the only reference you need.

Why Factory Parts Catalogs Beat Aftermarket Reprints

I have a stack of aftermarket catalogs in the back that are missing pages or have drawings that are close but not exact. With a Case 420B the difference between a 3/8” hose and a 1/2” hose can turn a simple repair into a return trip. Factory documents are printed from the original negatives. The part numbers in this catalog are the same ones Case stamped into the parts when they left the factory. Aftermarket photocopies often re-number parts or skip the “Numerical Index” that lets you verify. If you do this for a living, you buy the OEM version and move on.

Using the Numerical Index (Page 53) for Fast Part ID

The back of the catalog has a Numerical Index that lists every part number that appears in the book. If you pull a part off the machine and read the number stamped on it – say A12345 – you look it up in the index, and it tells you exactly which page has the drawing and where that part is called out. That is faster than paging through every diagram. For shops running a quick turnaround, this index alone pays for the catalog. Pair it with the Case 420B 1995 Operator’s Manual for the operating specs, and you have a complete reference for the machine.

What This Catalog Covers (and What It Doesn’t)

This is a Parts Catalog – it gives you exploded views, part numbers, and quantities. It does not include torque specs, repair procedures, or troubleshooting. For that you need the service manual. But if you are ordering parts, this is the definitive source. The catalog covers the wheel tractor itself (hood, grille, side panels, seat options like the Easy Ride on pages 32-33, tractor modification parts on page 28) as well as the loader and backhoe attachments. It does not cover the CX series or other models. For a mini excavator, grab the Case CX160B 2007 Parts Catalog – OEM Undercarriage Hydraulics or the Case CX27B 2007 Parts Catalog – OEM Factory Specs for Mini Excavator.

FAQ: Common Questions About This Catalog

Does this catalog include torque specifications for bolts?

No. This is a parts catalog, not a service manual. Torque values are in the factory service manual.

Can I use this catalog to identify parts for a 420B with a different attachment?

Yes, but only for the attachments listed in the TOC: loader bucket, boom, forks, blade, weight boxes, and the backhoe with all its cylinders. If your machine has a different attachment (like a grapple or a ripper), you would need the supplement for that attachment. This catalog covers the standard loader and backhoe configuration as shipped from Case.

Is the numerical index complete for all part numbers?

The index on page 53 covers every part number that appears in the catalog drawings. If you have an aftermarket or superseded part number, it will not be listed. For supersessions, you need to cross-reference with Case’s online system.

How many pages is this catalog?

68 pages. That includes the cover and the numerical index.

Whether you are a shop owner trying to reduce parts ordering mistakes or a backyard mechanic who wants the right parts the first time, this Case 420B Parts Catalog belongs on your workbench. Factory original, no reprints, no guesswork. Access the Factory Manual and start ordering the correct parts today.