Planer belt keeps coming off

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Forum topic by Grench posted 09-16-2013 06:56 AM 1243 views 0 times favorited 5 replies Add to Favorites Watch
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3 posts in 1678 days

09-16-2013 06:56 AM

Topic tags/keywords: belt planer dwalt dw733

Hello all.
I have a Dwalt planer DW733. It’s worked fine up until today. The belt came off while I was planning a board. I broke out the manual, followed the instructions and got the belt back on the pulleys. Got things started up but after about 30 seconds, the belt came off again. I’m sure you can see where this is going. I’ve put it back on 4 times now and it never lasts more that a minute before it comes off. Anyone know how I correct this problem?

5 replies so far

View mahdee's profile


3870 posts in 1730 days

#1 posted 09-16-2013 12:02 PM

Some times the pulleys come loose and either woble or are not at sinc with one another. Take the belt off and turn it on and look at the pulley’s action.


View Richard Miller's profile

Richard Miller

139 posts in 1934 days

#2 posted 09-16-2013 12:25 PM

The pulley’s my be working loose or chip in a pulley taking the belt off.

-- Dick F,Burg Iowa

View Grench's profile


3 posts in 1678 days

#3 posted 09-16-2013 02:16 PM

You guys are right. The pulley attached to the cutter head wobbles when I turn it on with the belt on. Looking at the schematic, it seems like there should be a nut on the outside of the pulley to keep it in place but my unit has no nut. Should getting a replacement nut solve the problem? How tight should I keep the pulley against the inside of the ball bearing/cutter head mechanism once I get a replacement nut?

View JustJoe's profile


1554 posts in 2001 days

#4 posted 09-16-2013 03:22 PM

Does it have a nut, or a small set screw that sits in the groove where the belt goes? Sometimes there is a hole in the groove of the pulley and the set screw goes in there and tightens down against a flat spot on the motor shaft. Sometimes they fall out but usually someone replaces the motor/pulley and forgets to put it in.
IF that’s the case, then your local hardware store sells them for about 30 cents. Just take the pulley with you to get the right size.

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View Grench's profile


3 posts in 1678 days

#5 posted 09-19-2013 11:46 AM

Well I purchased a nut from eReplacementParts for the Dewalt. I tried to get something at the HD but nothing they had worked. Anyway, I installed the nut and the machine works fine now. Belt stays on just like it should. I don’t know how the old one disappeared without me even seeing it on the shop floor. Thanks for all your help in diagnosing this little problem. Instead of spending $100 at the machine repair shop, I spent $0.95 for your advice and the replacement nut! Thanks!!!

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