Dewalt planer problem

When surfacing some 2x6 redwood planks, the Dewalt planer makes a clunking nose with the cutting head hesitated and jumped up a little in a cyclical fashion about every couple of seconds. This results in lines across the grain about every 4 inches apart that corresponded to the clunking sound.
I've checked the cutting head and it runs smooth without load. I also removed the blades and tested the rollers under load and it runs smooth as well. The external roller chain drive seems to be ok too. The blade lock for changing blades is not jammed with the cutting head rotated freely by hand. Belt for cutting head looks ok too. Motor brushes are in good condition. Replaced old blades with new, same problem.
I'm running out of things to check other taking the cutting head apart. Broken gear in the cutting head? Anyone has a similar problem? Any ideas?
Thanks in advance.
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On Sun, 2 Sep 2007 19:41:10 -0700, "** Frank **"

Try asking in rec.woodworking
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And specify which model of planer.
--
Regards,
Doug Miller (alphageek at milmac dot com)
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wrote:

DW733
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replying to ** Frank **, Ktroyh wrote: Check the roller bushings. The roller that has 2 chain spockets takes a heavy load and can wear the bushing faster at that end causing the roller to jump and cause the clunking noise as it moves out of alignment with the correct.plane of the roller.
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