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DW734 Planer is screeching and sparking

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Forum topic by DisgruntledJC posted 01-05-2021 05:58 AM 464 views 0 times favorited 3 replies Add to Favorites Watch
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DisgruntledJC

2 posts in 57 days


01-05-2021 05:58 AM

Topic tags/keywords: question planer milling tool troubleshooting

Good evening everyone. First I just wanted to say what a great site this is and appreciate everyone sharing the great content and wisdom. Much appreciated.

So I searched the forums for a hot minute and couldn’t find any related threads to my problem. I have a DW734 thickness planer which is about 2.5 years old. I’m just a hobbyist so it hasn’t been used that much. Over the weekend I was planing down some myrtle wood and after about 15 seconds it started to spark in the motor housing and make a horrible screeching sound.

First thought was to check the brushes, change blades, clean rollers, wax the bed, and clear out all dust. I discovered a lot of wood chips and buildup everywhere which made me think that was the reason. After reassembly it ran great for about 10 seconds and then the screeching started again. No sparks this time. It still runs but the sound is not normal and I don’t want to cause any further damage

Tonight I disassembled everything except the motor housing (I removed the power switch and cleared all the dust out…there was a lot). The only other thing I didn’t remove was the cutter head from the head. All the bearings look good and spin freely. The roller bushings also look fine and show no irregular wear and tear. The belt looks fine and is not cracked the motor pully spins free as well. I carefully inspected every part and nothing looks broken which makes me believe its something internal to the motor. I don’t know how remove the outer housing for the motor but I wouldn’t know what I’m looking at anyways. Any ideas what it could be?


3 replies so far

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Madmark2

2310 posts in 1599 days


#1 posted 01-05-2021 09:55 PM

What did the brushes look like?

Look in the brush hole with a strong light and inspect the commutator for excessive wear/damage. Rotate by hand to inspect all contacts.

Pull the drive belt and see if the squeal changes / stops. If so you know its on the cutter head side.

While you have the belt off, replace it. Check the old belt for wear spots and glaze.

All else fails hit it with a big hammer – it won’t fix anything but it’ll make you feel better. LOL

-- The hump with the stump and the pump!

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DisgruntledJC

2 posts in 57 days


#2 posted 01-06-2021 03:04 AM

Mark…thanks for the advice and it helped me trouble shoot this problem. I cleaned everything and re-lubed all moving parts with either hi temp grease (bushings) or dry lube spray. During reassembly I turned the planer on before moving to the next step to eliminate potential fail points. First the motor by it self not attached to anything. A friend had a few new belts sitting around so I installed that to test the motor and blade head next (Make sure to reinstall the rear dust shield/tool tray before testing this step as the dust shield unlocks the blade lock.) Third step was installing the rollers, sprockets, and chains. Next I reinstalled the blades. Finally I re-attached everything to the base. Each step resulted in no noise or sparking. So what did learn….clean your planer even if you don’t use it that much and soft pine will stick to everything. I didn’t run any wood through it yet so fingers crossed.

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Madmark2

2310 posts in 1599 days


#3 posted 01-06-2021 03:38 AM

Be sure to wax the feed trays with a liberal coat of Johnson’s Paste wax.

-- The hump with the stump and the pump!

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