Question about Dewalt Small Angle Grinder 4 1/2"

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My dewalt dw 402 grinder, starts fine, runs for a few minutes and then shuts down. Brushes appear to be fine.

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Pull it apart and clean the armature, you will find something between the brush contacts getting larger and making contact thus shorting it out, so clean the armature with fine point object do not gouge the material out of the area between the copper plates. Also blow out any metal dust you may see.

Posted on Aug 06, 2009

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Posted on Jan 02, 2017

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1 Answer

Operating instructions for DW 756


http://www.searspartsdirect.com/partsdirect/user-manuals/DW756TYPE1-Dewalt-Parts-BENCH+GRINDER-manual

The link should connect to the manual for DW 756. If the link does not work, go to the Sears parts web page and look up the grinder.

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1 Answer

Dewalt angle grinder comes up to speed then shuts off


without the model number I can't identify that part, but sounds like there is an electronic module if so equipped that is heat sensitive. Get back to me with the model number and I will see what I can do to help. Check for warranty repair also if that new of a tool.

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DeWalt DW 421 palm sander. Sander was working. All at once it lost power.Did not quit, just slowed down. When I lifted it off the board it sped up,but when I tried to sand again it slowed down-lost power....


From your description it sounds like the bearings on the armature seizing up . Mainly the bearing on the bottom towards the pad. I see it a lot . It'll seem ok when turned on but under a load it can stop , slow down , smoke ....I'd start by checking the bearings. If it was the cord power would cut in and out completely. It doesn't have a variable speed switch or any speed sensors on that model. .if you have any questions feel free to ask and give as much detail as possible plz.

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1 Answer

Dewalt Pressure washer keeps shutting off for no reason. plenty of gas and oil, water running to it. starts fine and as soon as I start spraying it shuts down.


Had a similar issue with my dewalt 4200 pw. Unit starting shutting off after spraying for about 5 min. Then difficult to restart, but would start again eventually only to shut down a few min later. Had new engine oil, new pump oil, good gas. I changed the spark plug and unit runs great again!

Aug 08, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

Grinder will not turn on


Maybe carbon brushes or motor.
Unplug.
Unscrew and pull back cover nearest cord.
Brushes should be touching rotor, the copper segments, and not too short. Smell for burnt offerings from the motor.
Some tools have thermal protection too.
See if there's a thermal fuse, which looks like a small shiny rod with a wire each end.
It could be inside sleeving.
On an electric motor, this is usually embedded in the stator, or field windings.**
This may have blown if grinder got too hot..
**Would need complete strip-down to inspect.
If motor is cooked, get wallet out.
Motor-parts/repair labor may cost more more than a new grinder.
Carbon brushes:
Take sample to store, with make/model of grinder.
Brushes fairly cheap.
Hope this helps,
Clive.

Oct 19, 2017 | Dewalt Small Angle Grinder 4 1/2"

1 Answer

Where I can find DW 479 owner's manual?


http://www.dewalt.com/Search/grinder.aspx Is your grinder a Dewalt? If so here is a website but I didn't see 479.

Jul 05, 2010 | Saws

1 Answer

I have a Dewalt dw 705 miter saw.when you pull the trigger the saw starts for a second and then shuts off. I have replaced the brushes and it worked for a few minutes and quits. the brushes do not seem to...


the armature needs to be cleaned or it is possibly bad (open bars) They make a special cleaning stick called a commutator stone that you might be able to purchase at a local repair shop. If you are not comfortable trying this I would recommend taking the saw with you, To clean properly you have to remove a cover and have the saw running, I would also check for proper movement in the brush tube allowing the brush to freely contact the armature. Let me know if you need more assistance and I will try and help.

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1 Answer

Dewalt dw 056


I have fix my dewalt dw 056 with a switch comming from an old dewalt hammer drill that i had lying around if you find and older dewalt hamme drill with burn brushes u can interchange the switch ,they sell the repalcement new switch for around $56.00 here in canada its not worthed u can get a new refurbish dewalt impact for around $99.00 from toolking

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1 Answer

Dewalt dw474 grinder quit


you need new brushes. carbon is meant to be touching the armature not the contact from the spring. Its worn down

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