On Sun, 19 Jul 2009 17:42:43 -0700 (PDT), Robert Macy
wrote:
This may not be a clutch by design, but rather a rubber 'alignment'
shaft. When new, the press fit kept the fan and motor locked
together, but with age and rubber deteriorating from actions of oil,
the press fit is slipping. Now to lock the fan to the motor shaft???
Thank you all.
Should I use super glue on the rubber?
No. Superglue is brittle and will crack loose the first time the fan
hits something. Start by tearing the rubber shaft (clutch?) apart and
cleaning it and the shaft. Remove all the old oil and goo. Use
alcohol to make the rubber swell a bit. Make sure the shaft is clean
and oil free. There should be enough friction to make it work. If
not, try some rubber belt no-slip compound used for improving the
friction in tape recorders, record players, and other rubber parts.
Avoid xylene (dimethylbenzene) based "rubber restorer" solutions as
they will soften the rubber but also probably make the shaft slip.
For high temperature lubricant, use a SOLID lubricant, not liquid.
Yeah, I know it doesn't penetrate, but that's the price you pay for
high temp. See:
http://www.tribology-abc.com/abc/solidlub.htm
for clues on different types. If you're lazy, try graphite lock lube
(the powder variety, not the messy stuff mixed with light oil). Keep
the lube away from the rubber "clutch" as it will make it slip.
I do some HP LaserJet printer repairs. The older models (LJII, LJIII
and LJ4) required some grease on the drive gears and a few metal gears
on shafts. When needed, I used lithium white auto grease, which is
probably not the right stuff, but worked well. However, all the other
nylon gears were self lubricating. The best way to make a huge mess
was to lube all the gears. I'm not 100.0% sure, but I believe that
current HP printers (LJ42xx, 43xx, etc) do not require any
lubrication. I sometimes use "rubber restorer" on the paper feed
rollers, but only if the paper is slipping and I don't have a
replacement roller or foot.
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558