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Any Electric Motor Experts?


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35 replies to this topic

#16 Texas Deere and Horse OFFLINE  

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Posted February 06, 2013 - 10:37 PM

Here is the part ya need:

 

 

???



#17 ol' stonebreaker OFFLINE  

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Posted February 06, 2013 - 11:48 PM

  Well, Marlboro, I knew lots of folks blow smoke but I didn't know they canned it,LOL!!!

                                                        Mike


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#18 LTD OFFLINE  

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Posted February 08, 2013 - 09:08 PM

Ordered the brushes. They should be here sometime next week. Hopefully they are they problem.

Here is one of the old ones.


IMG_1179.JPG


Edited by LTD, February 08, 2013 - 09:09 PM.


#19 KennyP ONLINE  

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Posted February 09, 2013 - 08:00 AM

Check your power cord for a broken wire, too. And be sure the switch is working. You can do that with an OHM meter.



#20 Michiganmobileman OFFLINE  

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Posted February 09, 2013 - 08:20 AM

Check your power cord for a broken wire, too. And be sure the switch is working. You can do that with an OHM meter.

Even a cheapy VOM is nice to have in the shop or shed.  With the grinder apart and a few quick checks its easy to see where the fault is. Let us know if your new brushes get you going or not.



#21 Reverend Blair OFFLINE  

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Posted February 14, 2013 - 07:18 AM

That brush looks okay (hard to tell from a photo).  Make sure the brushes are moving freely in the holders.  If they aren't, a few seconds with a needle file will clean things up.  

 

Also make sure that the connections for the field are solid.  Not sure about the DeWalts, but those are often just springs at the bottom of the grinder that wrap around the brush holders.  They break or shake loose from vibration. On many models (especially smaller ones) you have to replace the field if one of those breaks.  Fields tend to be pretty cheap, but are usually a PITA to change out.

 

I'd also double check the cord.  They can have a break that transmits enough power to get continuity, but not to run the grinder.  Wiggle the cord around while testing it with a meter.  

 

Same with the switch.  Turn it off an on several times while testing with a meter.

 

Finally, there's the armature.  They tend to be pricey, but are worth replacing with a higher-end tool.  They usually wear out where they contact the brushes, so check for wear there.  Also, clean that up with some emory cloth while you have it apart, even if it's okay.  Check the bearings and fan while you have it apart too.  Those tend to wear from debris, although they won't keep the tool from running.  If the tool is blowing breakers, that's usually a dead short in the armature.

 

Might as well clean and re-grease the gears while you have it a part too. 

 

Finally, when you plug it back in to test it, make sure you are holding onto it with at least one hand.  Sometimes a secondary problem will cause them to start without activating the switch.  Before you activate the switch, make sure you are holding on with  two hands...a glitch in reassembly can cause them to torque in odd ways.  Always test without any blades or stones attached.



#22 ol' stonebreaker OFFLINE  

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Posted February 16, 2013 - 10:31 AM

  Well, LTD, did you find the problem?

                                         Mike



#23 LTD OFFLINE  

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Posted February 20, 2013 - 09:08 PM

I just put the brushes in today. No go. I am goingto test the switch tomorrow. The cord is fine.



#24 LTD OFFLINE  

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Posted February 24, 2013 - 10:32 PM

Ok. I tested the switch and that was the problem. A new one should be here this week. Hopefully that will fix it.



#25 Alc ONLINE  

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Posted February 25, 2013 - 05:58 AM

Hope  it fixes it for you  , I'm sure  at times you  thought that it would have been easier  just to toss it for a new one but the experience will come in handy for other troubleshooting and repairing  electrical problems 



#26 ol' stonebreaker OFFLINE  

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Posted February 25, 2013 - 08:47 AM

  Glad you found the problem.

                                               Mike



#27 LTD OFFLINE  

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Posted February 25, 2013 - 08:56 AM

Hope  it fixes it for you  , I'm sure  at times you  thought that it would have been easier  just to toss it for a new one but the experience will come in handy for other troubleshooting and repairing  electrical problems 


It did cross my mind to throw it in the trash a couple times but it is
an older model and I am sure it is better than the new ones they are
making.


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#28 WNYTractorTinkerer ONLINE  

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Posted February 25, 2013 - 10:17 AM

Sounds like you are just too dang attached to that grinder!!  Go to H/F and get another one for $15-$20!!



#29 ol' stonebreaker OFFLINE  

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Posted February 25, 2013 - 10:57 AM

  Sounds about like me w/ my old Makita 4". I've replaced the brushes and brgs in it and it's about 20 yrs old. I noticed HD sells a 4" Makita for the same price I gave for mine. Wonder if it's as tough as the old one?

                                                   Mike



#30 LTD OFFLINE  

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Posted February 25, 2013 - 07:53 PM

Sounds like you are just too dang attached to that grinder!!  Go to H/F and get another one for $15-$20!!

I have a policy with HF. Never buy anything with moving parts from there. :rolling:






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