Cat MD6420 Rotary Drill Parts Manual (BI014062) (SN 2U67X68)

The MD6420 lives in rough ground—quarries, mines, big construction sites—chewing holes all day in dust, vibration, and weather that’d wreck lighter gear. This parts manual helps you trace every component in that drill, from the boom to the crawler, so you can order the right pieces and keep it turning. Picture this: you’re halfway through a mast teardown, you’ve got two similar-looking snap rings on the bench, and the dealer’s asking, “Which one?” This book’s how you isolate that answer instead of guessing.

Applications & Use Cases

• Track down the exact snap ring, seal, or shim in an assembly so you don’t order three “maybes” and hope one fits.
• Verify how a sub-assembly goes together—trace the parts breakdown, then align what you’re seeing on the machine with the exploded view.
• Check superseded part numbers when the old tag’s gone and you’re trying to keep an older MD6420 in the rotation.
• Inspect hose routing and hardware callouts so you can route new lines cleanly instead of copying someone’s past mistakes.
• Isolate which side-specific parts you need (left/right, front/rear) before you tear into the drill on a tight shutdown window.

FAQ

Q: Is this a PDF I can search on my laptop or tablet?

A: Yes, it’s typically a searchable PDF, so you can jump to sections or part numbers instead of flipping pages.

Q: Can I print just the sections I need for the field?

A: You usually can; most folks print the systems they’re working on, stick them in a binder, and don’t risk the whole manual in the dust and grease.

Safety Note

Always lockout, tag, and bleed any stored energy on the MD6420 before you start pulling components the manual helps you identify.

Cat MD6420 Rotary Drill Index:

GENERAL LOCATOR / DECALS / FILTER ELEMENTS 1-0
2-0 OPERATOR’S CAB 2-0
3-0 MAINFRAME / CRAWLER 3-0
4-0 ENGINES / COMPRESSORS / DRIVES 4-0
5-0 DUST CONTROL 5-0
6-0 MAST 6-0
7-0 DRILLING TOOLS / ACCESSORIES 7-0
8-0 HYDRAULICS / PLUMBING 8-0
9-0 ELECTRICAL 9-0
10-0 REVERSE INDEX and more

Caterpillar