Took it apart and the chain has a bad link. Stiff as can be. Tried
flexing it back & forth. Gave up & ordered $4 replacement chain from
repair center.

Thanks for all the help!
Happy St. Paddy's

On Mar 17, 8:20*pm, "Doug S" wrote:
Remove the guard over the chain drive for the rollers and I bet you will
find that the chain keeps jumping a tooth on one of the sprockets. This is
due to stretch in the chain. You need to replace the chain. I own a tool
repair shop and I have had to replace several of these for customers who had
the same symptoms.
Doug

" wrote in message

...

Have a few year old DeWalt 733 that recently started behavior of
making a loud "thunk" noise as board is fed through machine. *When
this happens, the board stops dead in it's tracks (only for a
millisecond), it continues through, and then there is usually a divot
in the board where the thunk occurred. *It was a gradual thing at
first, but now it happens regularly. *I replaced the blades today with
new ones...same thing. *I cleaned the rollers with denatured alcohol,
have even tried 120grit sandpaper on them, and waxed the in/out feed
tables...same thing. *I'm planing poplar if it matters at all. *I'm
only planing 1/64" or so when this happens, but it happens at other
removal thicknesses also. *Is my next stop the service center??

Cheers