Go Back   RCCrawler Forums > RCCrawler General Tech > Electronics
Loading

Notices

Thread: Motor keeps cutting off! :(

Reply
 
LinkBack Thread Tools Display Modes
Old 07-21-2011, 06:25 PM   #1
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default Motor keeps cutting off! :(

Alright, so i have the holmes hobbies 22T mini motor for the mini rock crawler.

after some run time, about 2hours in total, i noticed that the motor keeps cutting off, and it is not due to a dead battery or bad brushes. Also, after this issue, my motor is now running very slow, and its causing me headaches..

I did recently wipe the brushes and com, and this helped the motor run without stopping, but after a run it began happening again..

Does anyone know what I can do?

Thanks
MRCCRAWLER1.9 is offline   Reply With Quote
Sponsored Links
Old 07-21-2011, 06:27 PM   #2
MODERATOR™
 
EeePee's Avatar
 
Join Date: Jul 2004
Location: Ohio
Posts: 18,928
Default

Quote:
Originally Posted by MRCCRAWLER1.9 View Post

I did recently wipe the brushes and com
What does this mean?
EeePee is offline   Reply With Quote
Old 07-21-2011, 06:29 PM   #3
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

Quote:
Originally Posted by EeePee View Post
What does this mean?
i used a wet towel, and wiped down the brush and the com, and this fine material came off.

i believe its called a com? its the brass part that touches the brushes.
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-21-2011, 06:32 PM   #4
MODERATOR™
 
EeePee's Avatar
 
Join Date: Jul 2004
Location: Ohio
Posts: 18,928
Default

Alright. And it's copper.

When it cuts off, what happens if you give it a push? Does it start to run again?
EeePee is offline   Reply With Quote
Old 07-21-2011, 06:34 PM   #5
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

Yup, when I give it a little push, the motor begins to start going again.
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-21-2011, 06:35 PM   #6
MODERATOR™
 
EeePee's Avatar
 
Join Date: Jul 2004
Location: Ohio
Posts: 18,928
Default

Comm cut needed. Email JohnRobHolmes if you don't have access to a motor lathe.
EeePee is offline   Reply With Quote
Old 07-21-2011, 07:05 PM   #7
no talent hack
 
Join Date: Feb 2007
Location: Redwood City
Posts: 2,479
Default

i have seen some instalations where the brush wires were either too short or caught on the endbell preventing the spring from being able to push the brush all the way in. check to make sure this isnt happening.
Nabil is offline   Reply With Quote
Old 07-21-2011, 07:11 PM   #8
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

Quote:
Originally Posted by e-hills4x4 View Post
i have seen some instalations where the brush wires were either too short or caught on the endbell preventing the spring from being able to push the brush all the way in. check to make sure this isnt happening.
oh, this could be it, possibly.
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-21-2011, 11:54 PM   #9
I wanna be Dave
 
Join Date: Nov 2010
Location: 07456 N. NJ USofA
Posts: 8,314
Default

Quote:
Originally Posted by e-hills4x4 View Post
I have seen some installations where the brush wires were either too short or caught on the endbell preventing the spring from being able to push the brush all the way in. Check to make sure this isn't happening.
+1.

Also check to make sure the attach point on the brush to endbell is tight, it's possible it's a little loose.
Make absolutely sure the brushes move freely as well, no binding in the brush hood and the brush leads are not hanging up on the hood or spring.
How long are the brushes?
Charlie-III is offline   Reply With Quote
Old 07-21-2011, 11:58 PM   #10
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

alright, ill check that up tomorrow.

As for the length of the brushes, they are about a good 6mm, so there shouldnt be any issue there.. however, i did notice that the brush itself was pretty browned out. close to a black. does this affect anything?

i used to run 13t brushed motors on my slash, and i know that the brushes themselves had a good bronze color to them even after a lot of runs. however with these brushes, they have a charcoaled look on them. is it pretty normal?
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-22-2011, 12:23 AM   #11
I wanna be Dave
 
Join Date: Nov 2010
Location: 07456 N. NJ USofA
Posts: 8,314
Default

Quote:
Originally Posted by MRCCRAWLER1.9 View Post
alright, ill check that up tomorrow.

As for the length of the brushes, they are about a good 6mm, so there shouldnt be any issue there.. however, i did notice that the brush itself was pretty browned out. close to a black. does this affect anything?

i used to run 13t brushed motors on my slash, and i know that the brushes themselves had a good bronze color to them even after a lot of runs. however with these brushes, they have a charcoaled look on them. is it pretty normal?
Ummmmm.....NO! Sounds like they are/were hanging up in the brush hood and arcing a lot, thus the dark side color and "charcoal" surface that mates to the comm.
It may be time to get a motor rebuild which is a cleaning, comm cut, new brushes and reseat them.
Charlie-III is offline   Reply With Quote
Old 07-22-2011, 12:25 AM   #12
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

oohhh!

hmm, thats strange, in total i have had about 2hours run time on this motor. is it supposed to wear this fast?

my 13T has been ran hours on end without facing this issue.. only issue ive had was that the motor brushes got way to short, and needed to get replaced.
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-22-2011, 12:28 AM   #13
I wanna be Dave
 
Join Date: Nov 2010
Location: 07456 N. NJ USofA
Posts: 8,314
Default

Quote:
Originally Posted by MRCCRAWLER1.9 View Post
oohhh!

hmm, thats strange, in total i have had about 2hours run time on this motor. is it supposed to wear this fast?

my 13T has been ran hours on end without facing this issue.. only issue ive had was that the motor brushes got way to short, and needed to get replaced.
In general, no, it shouldn't wear that fast.
It's possible there was some dust/dirt in the brush hood that hung up the brush, or, the brush lead was hung up on something reducing the pressure of the brush against the comm.

I can't be sure of either, but you are wearing the brushes out fast and getting them too hot.
Charlie-III is offline   Reply With Quote
Old 07-22-2011, 12:37 AM   #14
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

hmm, guess ill be doing a whole rebuild tomorrow

thanks charlie!
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-22-2011, 12:49 AM   #15
I wanna be Dave
 
Join Date: Nov 2010
Location: 07456 N. NJ USofA
Posts: 8,314
Default

Quote:
Originally Posted by MRCCRAWLER1.9 View Post
hmm, guess I'll be doing a whole rebuild tomorrow

thanks Charlie!
Keep us posted on your progress in this thread. Makes it easier for any help to see what has gone on and suggestions made (with follow-ups).
It could also help the next person with an issue that is similar......provided they search.......
Charlie-III is offline   Reply With Quote
Old 07-22-2011, 02:35 PM   #16
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

crappy phone pic, but here is the com.



its in bad shape, right?
MRCCRAWLER1.9 is offline   Reply With Quote
Old 07-22-2011, 02:36 PM   #17
Pebble Pounder
 
Join Date: Jul 2008
Location: Tamworth, England.
Posts: 124
Default

That is in pretty bad shape :(
igbandy is offline   Reply With Quote
Old 07-22-2011, 02:50 PM   #18
MODERATOR™
 
EeePee's Avatar
 
Join Date: Jul 2004
Location: Ohio
Posts: 18,928
Default

I said holy shit out loud.
EeePee is offline   Reply With Quote
Old 07-22-2011, 02:51 PM   #19
I wanna be Dave
 
Join Date: Jan 2008
Location: Arat Alabama
Posts: 2,678
Default

TEDROCKZ is offline   Reply With Quote
Old 07-22-2011, 04:17 PM   #20
RCC Addict
 
Join Date: May 2010
Location: Los Altos, California
Posts: 1,509
Default

yea, its in scrap shape :(

but! i just looked at the wires to the brushes, and noticed that the spring to push in the brushes were getting blocked, since there is a little gap that ends too far away from the brushes, and allow full use of the brush, so i just pulled the spring back, and make it straight, rather than having a hook at the end. This pushed my brushes into the com, and now it runs just fine! !!!!!

WOOHHOOOO its still running with a really beat up com

time will only tell.
MRCCRAWLER1.9 is offline   Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 07:38 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com