DeWalt 733 planer died today - Router Forums
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post #1 of 38 (permalink) Old 09-18-2017, 04:43 PM Thread Starter
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Default DeWalt 733 planer died today

I bought it new in 1997 and used it off and on for the first 17 years but in the last 3 I have used it a lot, sometimes daily. It has always run fine but today I turned it on and it ran for 1/2 a second then quit. Here's what I know:

1) It is getting power, I even switched to different circuit altogether
2) I pulled the switch out to verify that it is good
3) The brushes, though original, are still 1/2" long and show no signs of chipping or abnormal wear
4) The wires on the brushes are intact and the springs have plenty of tension
5) The motor is easy to spins (took the side covers off to verify)
6) The 18 amp built-in breaker on the top of the motor is in the position it should be in
7) In shining a light onto the commutator I see no chips or bridged arcs between segments

I don't really want to spend the money on a new planer and would rather get this one running again. I can order new brushes just to rule that out but again, the current ones look fine to me.

Ideas?

David

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post #2 of 38 (permalink) Old 09-18-2017, 06:10 PM
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David; did you do a simple continuity check to the load side of the switch?
When something was working and then it's not...what changed?
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post #3 of 38 (permalink) Old 09-18-2017, 06:13 PM
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With me it was a drill press. Replaced the switch and that was all it took to fix it. Still going strong.

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post #4 of 38 (permalink) Old 09-18-2017, 06:15 PM Thread Starter
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That's what I don't understand. It has never given a hint of trouble and ran fine yesterday. When I turned it on today and it ran for a 1/2 second I thought it must have tripped a breaker. But everything else plugged into that same circuit runs fine. So I plugged it into another one with the same result. Then I pulled the switch completely out, plugged it in again, and checked power on both sides of the switch and there's a full 120 volts on the motor side of the switch.

This is the position of the breaker switch, looks to me like that's where it's supposed to be. And it doesn't want to move at all other than a slight rocking back and forth but it's always been like that. And it has never tripped.

DeWalt 733 planer died today-001-breaker-switch.jpg

DeWalt 733 planer died today-002-breaker-switch.jpg

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post #5 of 38 (permalink) Old 09-18-2017, 07:14 PM
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Jumpering a wire across the breaker contacts will prove if that's the problem at least. Just do that and turn it on. Be prepared to turn it off quickly too. It doesn't sound like a burned armature and you say it shows no signs. Usually there is a drop in power and rpm just before it quits if that is the problem. About the only other thing I can think of is a broken wire.

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post #6 of 38 (permalink) Old 09-18-2017, 07:40 PM
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Quote:
Originally Posted by DaninVan View Post
David; did you do a simple continuity check to the load side of the switch?
When something was working and then it's not...what changed?
do that to the breaker too...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
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post #7 of 38 (permalink) Old 09-18-2017, 08:13 PM Thread Starter
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I may have to do that with the breaker but that means just about a full dismantle and I don't have time to do that until Thursday or Friday.

Thanks, Guys!
David

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post #8 of 38 (permalink) Old 09-18-2017, 11:38 PM
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Quote:
Originally Posted by difalkner View Post
That's what I don't understand. It has never given a hint of trouble and ran fine yesterday. When I turned it on today and it ran for a 1/2 second I thought it must have tripped a breaker. But everything else plugged into that same circuit runs fine. So I plugged it into another one with the same result. Then I pulled the switch completely out, plugged it in again, and checked power on both sides of the switch and there's a full 120 volts on the motor side of the switch.

This is the position of the breaker switch, looks to me like that's where it's supposed to be. And it doesn't want to move at all other than a slight rocking back and forth but it's always been like that. And it has never tripped.

Attachment 300066

Attachment 300074

David
I would get to the switch, detach some wire(s) and check the switch continuity when in ON & OFF positions...

Do the same thing to the Breaker / Fuse IN THE Machine... The Breaker could go bad... and if the breaker went bad, there is probably a REASON for it... ergo, another problem somewhere... (??)

Those two items should shed some light on it...
You have to check each one on it's own, NOT connected to the machine.

Let us know what happens, OK?

Good luck...

Have Fun,
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post #9 of 38 (permalink) Old 09-18-2017, 11:56 PM
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The wire between the switch and motor OK? Is the breaker broken (just happened to an old one in my house panel.) Anything jammed in the blades, or any binding in the drive that rotates the blade?

The more I do, the less I accomplish.
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post #10 of 38 (permalink) Old 09-19-2017, 07:16 AM Thread Starter
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Quote:
Originally Posted by Joe Lyddon View Post
I would get to the switch, detach some wire(s) and check the switch continuity when in ON & OFF positions...

Quote:
Originally Posted by difalkner View Post
Then I pulled the switch completely out, plugged it (the power cord) in again, and checked power on both sides of the switch and there's a full 120 volts on the motor side of the switch.
David
Do the same thing to the Breaker / Fuse IN THE Machine... The Breaker could go bad... and if the breaker went bad, there is probably a REASON for it... ergo, another problem somewhere... (??)

Those two items should shed some light on it...
You have to check each one on it's own, NOT connected to the machine.

Let us know what happens, OK?

Good luck...
Did that already - see above. I can pull it again and check continuity but if it's getting 120 volts on the switched side then I'm going to say the switch is good. To get to the little breaker I've shown in the photo requires a full breakdown and I won't have time for that until the end of the week.

Thanks!
David
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