Thread: N series Jacobs Super Chuck Rebuilds and others.

This has been prompted by my buying from overseas, several Jacobs SuperChucks, which is what they call their N series chucks, which have ball bearings, as against most other chucks which have plain bearings, and which therefor are unable to grip drill bits as tightly as the N series chucks. I do not claim this as the "last word" on the subject, but the procedures for overhauling the chuck, and information allowing you to select the correct parts for it will be found in the links below.
This info is for anyone wanting to rebuild or restore function to a chuck which is either worn or loaded with contaminants which are affecting its usability. The second link has toward the bottom, several hot links to a Jacobs Catalogue of around 2003, and I have noticed that some of the cat. Nos. appear to have changed from those quoted in the first link. It is important to note that there have been subtle changes in some Jacobs chucks which have identical model numbers, but at least some of the later chucks have their appropriate rebuild kits listed on the nose of the chuck. This first link has the later information I think, but I have not been able to verify it for certain.
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Jacobs Drill Chucks

Keyed Drill Chuck Repair - Drill Chuck Dissassembly - Jacobs Chuck Technical Support
And here is a procedure from Jacobs themselves, I hope that someone finds this useful,
Rob