dw734 planer problems

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Blog entry by UcancallmeJ posted 07-10-2017 08:49 PM 985 reads 0 times favorited 8 comments Add to Favorites Watch

i have a dewalt 734 planer and it is making a wavy finish on the board. Is this the result of a bent roller or could it be something else? Please help

8 comments so far

View PPK's profile


1641 posts in 1416 days

#1 posted 07-10-2017 09:07 PM

Hmm, I’d say that could be a possibility… It’s pretty easy to check that, the rollers are visible if you crank up the power head and watch them. I’ve never dug into the rollers, but I’m guessing there are some bearings they ride in, and perhaps one of the bearings is failing or the device that holds them has failed.

I’d also check the blades and make sure one of the blades didn’t get knocked out of alignment.

Finally, I’d check the locking mechanism (the lever you click down once you set the height) to make sure that is solid and not moving.

I’ve never had any troubles with my 734 at all… Did yours just start doing it suddenly? Or over time got wavier?

-- Pete

View waho6o9's profile


8812 posts in 3183 days

#2 posted 07-10-2017 09:09 PM

I’m not sure as i take off a little at a time and every once in a while i vacuum in the insides and then

lube up the posts etc…...

Sorry not much help.

In any event welcome to LumberJocks.

View gargey's profile


1013 posts in 1382 days

#3 posted 07-10-2017 09:11 PM

Maybe it is drunk.

View Redoak49's profile


4354 posts in 2595 days

#4 posted 07-10-2017 11:47 PM

A couple of guesses and give you some real suggestions…

The bearings on the cutter head could be bad.

If the board is not being held down by the rubber rollers, you could get waves in the board.

Best guess is that the bushing on the rollers are bad or the spring that pushes on the roller down is bad.

I had a DW733 which is similar and had to replace the bearing blocks, sprocket and chain. You should take the side covers off and inspect the sprockets, chains, bushings.

Good Luck

View UcancallmeJ's profile


2 posts in 927 days

#5 posted 07-11-2017 03:50 AM

Thanks for the suggestions. I’ll try some of these and post later on my findings.

View Rich's profile


5137 posts in 1196 days

#6 posted 07-11-2017 05:46 AM

You’ll figure it out I’m sure, but in the meantime, is it wavy straight across the board, and does it run end-to-end? If it’s worse on the ends — or one end — where the weight of the board affects it, that would definitely point to a roller, or rollers, out of whack. Kind of like perpetual sniping.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View Woodknack's profile


13017 posts in 2986 days

#7 posted 07-11-2017 08:33 AM

Waves or scallops mean something is moving up and down. I don’t believe the platen can move on that planer so it has to be the head.

Maybe it is drunk.
- gargey


-- Rick M,

View pintodeluxe's profile


6035 posts in 3420 days

#8 posted 07-13-2017 05:28 PM

1+ make sure the cutterhead is locked and you take light passes with fresh knives before you go tearing out the bearings. Forgetting to lock the cutterhead would be the easiest culprit.

I’m not sure how long the factory bearings last, as I replaced the cutterhead on my 735 with a Shelix. The new head came with replacement bearings.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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