PBI 6″ set-rite chuck; How to take apart for cleaning and regreasing

[SteveIParticipant @stevei]

I recently obtained a Pratt Burnerd 6" 3 Jaw set-rite (4 adjusting screws at 90 deg) chuck Catalgoue No. 1219-00360. It is new old stock and was very gummed up with anti rust paper remains. It has apparently sat on the shelf since the early 1980's.

I have taken the jaws out and cleaned it as best I can. I understand that these are made to a tight tolerance but it is still very stiff. There is a grease nipple. I expect any grease inside will be congealed. I want to open it up and clean it and re-grease.

Does anyone have any advice or a copy of a maintenance sheet? Picture of rear inserted below and there is a front and side in my album.

Thanks,

Steve

[SteveIParticipant @stevei]

[Nick_GParticipant @nick_g]

.

Nice find.

Unless it's very, very gummed up so much that it stops adjustment I would for now just use it.

Over a couple of weeks of being splattered with coolant / cutting oil and being worked I think you will find all will become pukka.

Nick

[SteveIParticipant @stevei]

Well after a few hours I got it moving and now have the scroll clean and the internals accessed via the adjustment pinion reasonably clean. I gave up trying to take it apart. Fresh grease inside and now it is in use. Happily it is very accurate. Pratt Burnerd steel chucks are beautifully made. It is still very stiff with no slop whatsoever.

Steve

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