The Stovebolt Site Forums The Parking Lot Big Bolts Hydrovac rebuild question

I have a 1944 CCKW 2.5 ton Army truck. The hydrovac appears to be a postwar retrofit. It is almost identical to the hydrovac article available on this website. The one thing the article doesn't mention is the order of the 3 big disks and the leather washer. In his article he didn't disassemble it. I did and forgot to take a picture. Can anyone tell me which order they go back together? Which way does the leather go?

rustednuts will have the best information for you; but, here is a 1946-54 diagram that might help.

This is a website I found for my Dodge but they used a hydrovac as well.

http://www.dodgepilothouseclub.org/know/manual/manual.htm

Click on general truck manuals, vacuum brakes, it is a 18meg download with 3 variations on the hydrovac and overhaul sequence.

Ryan

What oil or grease is recommended on these hydrovacs? When I disassembled it, there was a very thick layer of very black, but fresh looking grease, on the cylinder wall on the opposite side of the big spring. Should I apply more grease when I reassemble it?

Neil

I can email you a few pictures out the rebuild manual. Shoot me an email an Ill get them off to you. blazer_007@hotmail.com

As far as lubricating them, I used mineral oil on mine. You dont want to use anything that has a direct petroleum base. You could also use a thin synthetic, like a corn based oil. Youll want to avoid any thick oils.

Jeff

I have seen many recommendations that say to use air tool oil.