Hitachi C10FC Compound Miter Saw problems

Would bad brushes make the brake stop working. When I look at the
motor when it is running I see a lot of arching.

"AL" <[email protected]> wrote in message news:<Nd1Pb.88507$5V2.147851@attbi_s53>...
> Probably time for new brushes.
>
> "paul" <[email protected]> wrote in message
> news:[email protected]...
> > I have had this saw for about 6 years and love it.
> >
> > I recently started having problems with it. The automatic brake
> > stopped working. When I let up on the trigger the blade keeps
> > spinning for quite a while. I also see lots of sparks from where the
> > brushes are housed. Does anybody know what the problem might be and
> > how I can fix it. Also where is a good place in Seattle to get it
> > fixed.
> >
> > Thanks if advance
> > Paul

Thanks for replying.

The brushes don't seem to be worn down to much. When I run the saw it
sounds different and I can see an arch going almost all the way around
the armature contacts. I will try some new brushes.


"P©WÉ®T©©LMAN ²ºº4" <[email protected]> wrote in message news:<[email protected]>...
> "paul" <[email protected]> wrote in message
> news:[email protected]...
> > Would bad brushes make the brake stop working. When I look at the
> > motor when it is running I see a lot of arching.
>
> Yes, for the electric brake to work the brushes have to be in full contact
> with the commutator plates on the armature, if you continue to use the saw
> while needing the brushes replaced the arcing will pit & score the armature
> so that even brush replacement will not reactivate the brush & worse still
> you could burn out or shorten the life of the armature dramatically, for a
> $3.50 set of brushes that can be inspected & replaced yourself don't
> hesitate, remove the external caps & have a look.....if you have trouble
> locating a new set let me know we have dozens of pairs in stock..Part #
> 999-043. But there should be an Hitachi dealer near you.
> A new brush is just over 5/8" (17mm) long if yours is less than 1/4" (6mm)
> or chipped or burnt on one edge replace them at once. The brush spring
> should pop out easily towards you, if you have to pry it out then you know
> for sure your problem is either a very worn brush or the brush may be
> compacted in the brush holder with sawdust....either way the electric brake
> will not activate properly.

Does anybody know how much a new armature would cost. Is there an
online store that sells parts for this saw?

Thanks,
Paul


"P©WÉ®T©©LMAN ²ºº4" <[email protected]> wrote in message news:<[email protected]>...
> Sounds like you have a bigger problem than the electric brake to worry
> about...possibly a new armature &/or field, at least with Hitachi the price
> will be reasonable & worth doing.
>
> Regards & best of luck
> --
> © Jon Down ®
> http://www.stores.ebay.com/jdpowertoolcanada
>
> "paul" <[email protected]> wrote in message
> news:[email protected]...
> > Thanks for replying.
> >
> > The brushes don't seem to be worn down to much. When I run the saw it
> > sounds different and I can see an arch going almost all the way around
> > the armature contacts. I will try some new brushes.
> >
> >
> > "P©WÉ®T©©LMAN ²ºº4"
> <[email protected]> wrote in message
> news:<[email protected]>...
> > > "paul" <[email protected]> wrote in message
> > > news:[email protected]...
> > > > Would bad brushes make the brake stop working. When I look at the
> > > > motor when it is running I see a lot of arching.
> > >
> > > Yes, for the electric brake to work the brushes have to be in full
> contact
> > > with the commutator plates on the armature, if you continue to use the
> saw
> > > while needing the brushes replaced the arcing will pit & score the
> armature
> > > so that even brush replacement will not reactivate the brush & worse
> still
> > > you could burn out or shorten the life of the armature dramatically, for
> a
> > > $3.50 set of brushes that can be inspected & replaced yourself don't
> > > hesitate, remove the external caps & have a look.....if you have trouble
> > > locating a new set let me know we have dozens of pairs in stock..Part #
> > > 999-043. But there should be an Hitachi dealer near you.
> > > A new brush is just over 5/8" (17mm) long if yours is less than 1/4"
> (6mm)
> > > or chipped or burnt on one edge replace them at once. The brush spring
> > > should pop out easily towards you, if you have to pry it out then you
> know
> > > for sure your problem is either a very worn brush or the brush may be
> > > compacted in the brush holder with sawdust....either way the electric
> brake
> > > will not activate properly.

Is it possible to file or sand smooth the contacts on the armature?


"AL" <[email protected]> wrote in message news:<DvaQb.129617$I06.1120505@attbi_s01>...
> Toolpartsdirect.com has it. $120. Not worth it.
>
> "paul" <[email protected]> wrote in message
> news:[email protected]...
> > Does anybody know how much a new armature would cost. Is there an
> > online store that sells parts for this saw?
> >
> > Thanks,
> > Paul
> >
> >
> > "P©WÉ®T©©LMAN ²ºº4"
> <[email protected]> wrote in message
> news:<[email protected]>...
> > > Sounds like you have a bigger problem than the electric brake to worry
> > > about...possibly a new armature &/or field, at least with Hitachi the
> price
> > > will be reasonable & worth doing.
> > >
> > > Regards & best of luck
> > > --
> > > © Jon Down ®
> > > http://www.stores.ebay.com/jdpowertoolcanada
> > >
> > > "paul" <[email protected]> wrote in message
> > > news:[email protected]...
> > > > Thanks for replying.
> > > >
> > > > The brushes don't seem to be worn down to much. When I run the saw it
> > > > sounds different and I can see an arch going almost all the way around
> > > > the armature contacts. I will try some new brushes.
> > > >
> > > >
> > > > "P©WÉ®T©©LMAN ²ºº4"
> > > <[email protected]> wrote in message
> > > news:<[email protected]>...
> > > > > "paul" <[email protected]> wrote in message
> > > > > news:[email protected]...
> > > > > > Would bad brushes make the brake stop working. When I look at the
> > > > > > motor when it is running I see a lot of arching.
> > > > >
> > > > > Yes, for the electric brake to work the brushes have to be in full
> contact
> > > > > with the commutator plates on the armature, if you continue to use
> the
> saw
> > > > > while needing the brushes replaced the arcing will pit & score the
> armature
> > > > > so that even brush replacement will not reactivate the brush & worse
> still
> > > > > you could burn out or shorten the life of the armature dramatically,
> for
> a
> > > > > $3.50 set of brushes that can be inspected & replaced yourself don't
> > > > > hesitate, remove the external caps & have a look.....if you have
> trouble
> > > > > locating a new set let me know we have dozens of pairs in
> stock..Part #
> > > > > 999-043. But there should be an Hitachi dealer near you.
> > > > > A new brush is just over 5/8" (17mm) long if yours is less than 1/4"
> (6mm)
> > > > > or chipped or burnt on one edge replace them at once. The brush
> spring
> > > > > should pop out easily towards you, if you have to pry it out then
> you
> know
> > > > > for sure your problem is either a very worn brush or the brush may
> be
> > > > > compacted in the brush holder with sawdust....either way the
> electric
> brake
> > > > > will not activate properly.

I will try getting new brushes first. I will also try cleaning the
armature with a solvant.

Thanks

"AL" <[email protected]> wrote in message news:<ywjQb.107400$sv6.527790@attbi_s52>...
> I've never tried but the copper contacts are usually very thin so there
> isn't much to file or sand. If I were you, I would either spend $10 for new
> brushes and see if it solves the problem, or call 800-546-1666 for a local
> service center.
>
>
> "paul" <[email protected]> wrote in message
> news:[email protected]...
> > Is it possible to file or sand smooth the contacts on the armature?

Toolpartsdirect.com has it. $120. Not worth it.

"paul" <[email protected]> wrote in message
news:[email protected]...
> Does anybody know how much a new armature would cost. Is there an
> online store that sells parts for this saw?
>
> Thanks,
> Paul
>
>
> "P©WÉ®T©©LMAN ²ºº4"
<[email protected]> wrote in message
news:<[email protected]>...
> > Sounds like you have a bigger problem than the electric brake to worry
> > about...possibly a new armature &/or field, at least with Hitachi the
price
> > will be reasonable & worth doing.
> >
> > Regards & best of luck
> > --
> > © Jon Down ®
> > http://www.stores.ebay.com/jdpowertoolcanada
> >
> > "paul" <[email protected]> wrote in message
> > news:[email protected]...
> > > Thanks for replying.
> > >
> > > The brushes don't seem to be worn down to much. When I run the saw it
> > > sounds different and I can see an arch going almost all the way around
> > > the armature contacts. I will try some new brushes.
> > >
> > >
> > > "P©WÉ®T©©LMAN ²ºº4"
> > <[email protected]> wrote in message
> > news:<[email protected]>...
> > > > "paul" <[email protected]> wrote in message
> > > > news:[email protected]...
> > > > > Would bad brushes make the brake stop working. When I look at the
> > > > > motor when it is running I see a lot of arching.
> > > >
> > > > Yes, for the electric brake to work the brushes have to be in full
> > contact
> > > > with the commutator plates on the armature, if you continue to use
the
> > saw
> > > > while needing the brushes replaced the arcing will pit & score the
> > armature
> > > > so that even brush replacement will not reactivate the brush & worse
> > still
> > > > you could burn out or shorten the life of the armature dramatically,
for
> > a
> > > > $3.50 set of brushes that can be inspected & replaced yourself don't
> > > > hesitate, remove the external caps & have a look.....if you have
trouble
> > > > locating a new set let me know we have dozens of pairs in
stock..Part #
> > > > 999-043. But there should be an Hitachi dealer near you.
> > > > A new brush is just over 5/8" (17mm) long if yours is less than 1/4"
> > (6mm)
> > > > or chipped or burnt on one edge replace them at once. The brush
spring
> > > > should pop out easily towards you, if you have to pry it out then
you
> > know
> > > > for sure your problem is either a very worn brush or the brush may
be
> > > > compacted in the brush holder with sawdust....either way the
electric
> > brake
> > > > will not activate properly.

"paul" <[email protected]> wrote in message
news:[email protected]...
> I will try getting new brushes first. I will also try cleaning the
> armature with a solvant.
>
> Thanks

By cleaning.....it does not mean with a solvent..... use a very very extra
fine sandpaper, emery or preferably crocus cloth.

A quick way to do it without taking the saw apart is to fold a strip of
sandpaper to the same size as a brush firmly insert in the brush holder till
it sits evenly against the armature then rotate the blade with one hand
while applying light pressure to the sandpaper with the other.

It may help & you have nothing to loose if it needs a new armature anyway.
Change the piece of sandpapers contact point often for a better result. The
finer grit the better at the last.


--
© Jon Down ®
http://www.stores.ebay.com/jdpowertoolcanada

Probably time for new brushes.

"paul" <[email protected]> wrote in message
news:[email protected]...
> I have had this saw for about 6 years and love it.
>
> I recently started having problems with it. The automatic brake
> stopped working. When I let up on the trigger the blade keeps
> spinning for quite a while. I also see lots of sparks from where the
> brushes are housed. Does anybody know what the problem might be and
> how I can fix it. Also where is a good place in Seattle to get it
> fixed.
>
> Thanks if advance
> Paul

Sounds like you have a bigger problem than the electric brake to worry
about...possibly a new armature &/or field, at least with Hitachi the price
will be reasonable & worth doing.

Regards & best of luck
--
© Jon Down ®
http://www.stores.ebay.com/jdpowertoolcanada

"paul" <[email protected]> wrote in message
news:[email protected]...
> Thanks for replying.
>
> The brushes don't seem to be worn down to much. When I run the saw it
> sounds different and I can see an arch going almost all the way around
> the armature contacts. I will try some new brushes.
>
>
> "P©WÉ®T©©LMAN ²ºº4"
<[email protected]> wrote in message
news:<[email protected]>...
> > "paul" <[email protected]> wrote in message
> > news:[email protected]...
> > > Would bad brushes make the brake stop working. When I look at the
> > > motor when it is running I see a lot of arching.
> >
> > Yes, for the electric brake to work the brushes have to be in full
contact
> > with the commutator plates on the armature, if you continue to use the
saw
> > while needing the brushes replaced the arcing will pit & score the
armature
> > so that even brush replacement will not reactivate the brush & worse
still
> > you could burn out or shorten the life of the armature dramatically, for
a
> > $3.50 set of brushes that can be inspected & replaced yourself don't
> > hesitate, remove the external caps & have a look.....if you have trouble
> > locating a new set let me know we have dozens of pairs in stock..Part #
> > 999-043. But there should be an Hitachi dealer near you.
> > A new brush is just over 5/8" (17mm) long if yours is less than 1/4"
(6mm)
> > or chipped or burnt on one edge replace them at once. The brush spring
> > should pop out easily towards you, if you have to pry it out then you
know
> > for sure your problem is either a very worn brush or the brush may be
> > compacted in the brush holder with sawdust....either way the electric
brake
> > will not activate properly.

Yes, worn brushes would cause the electric brake to stop working (or to take
longer to stop), but that isn't the only reason. Your C10FC has externally
accessible brushes (ie. two round plugs on the side of the motor about the
size of a quarter). Why not remove and inspect them? If you do need new
brushes, have a look here:

http://www.toolpartsdirect.com/cgi-bin/noframes.cgi/hitachi/C10FC

Note, I am NOT affiliated with this site or Hitachi in any way.

"paul" <[email protected]> wrote in message
news:[email protected]...
> Would bad brushes make the brake stop working. When I look at the
> motor when it is running I see a lot of arching.
>
> "AL" <[email protected]> wrote in message
news:<Nd1Pb.88507$5V2.147851@attbi_s53>...
> > Probably time for new brushes.
> >
> > "paul" <[email protected]> wrote in message
> > news:[email protected]...
> > > I have had this saw for about 6 years and love it.
> > >
> > > I recently started having problems with it. The automatic brake
> > > stopped working. When I let up on the trigger the blade keeps
> > > spinning for quite a while. I also see lots of sparks from where the
> > > brushes are housed. Does anybody know what the problem might be and
> > > how I can fix it. Also where is a good place in Seattle to get it
> > > fixed.
> > >
> > > Thanks if advance
> > > Paul

"paul" <[email protected]> wrote in message
news:[email protected]...
> Would bad brushes make the brake stop working. When I look at the
> motor when it is running I see a lot of arching.

Yes, for the electric brake to work the brushes have to be in full contact
with the commutator plates on the armature, if you continue to use the saw
while needing the brushes replaced the arcing will pit & score the armature
so that even brush replacement will not reactivate the brush & worse still
you could burn out or shorten the life of the armature dramatically, for a
$3.50 set of brushes that can be inspected & replaced yourself don't
hesitate, remove the external caps & have a look.....if you have trouble
locating a new set let me know we have dozens of pairs in stock..Part #
999-043. But there should be an Hitachi dealer near you.
A new brush is just over 5/8" (17mm) long if yours is less than 1/4" (6mm)
or chipped or burnt on one edge replace them at once. The brush spring
should pop out easily towards you, if you have to pry it out then you know
for sure your problem is either a very worn brush or the brush may be
compacted in the brush holder with sawdust....either way the electric brake
will not activate properly.


--
© Jon Down ®
My eBay items currently listed:
http://cgi6.ebay.com/ws/eBayISAPI.dll?ViewSellersOtherItems&userid=lamblies&include=0&since=-1&sort=3&rows=25

I've never tried but the copper contacts are usually very thin so there
isn't much to file or sand. If I were you, I would either spend $10 for new
brushes and see if it solves the problem, or call 800-546-1666 for a local
service center.


"paul" <[email protected]> wrote in message
news:[email protected]...
> Is it possible to file or sand smooth the contacts on the armature?
>
>
> "AL" <[email protected]> wrote in message
news:<DvaQb.129617$I06.1120505@attbi_s01>...
> > Toolpartsdirect.com has it. $120. Not worth it.
> >
> > "paul" <[email protected]> wrote in message
> > news:[email protected]...
> > > Does anybody know how much a new armature would cost. Is there an
> > > online store that sells parts for this saw?
> > >
> > > Thanks,
> > > Paul
> > >
> > >
> > > "P©WÉ®T©©LMAN ²ºº4"
> > <[email protected]> wrote in message
> > news:<[email protected]>...
> > > > Sounds like you have a bigger problem than the electric brake to
worry
> > > > about...possibly a new armature &/or field, at least with Hitachi
the
> > price
> > > > will be reasonable & worth doing.
> > > >
> > > > Regards & best of luck
> > > > --
> > > > © Jon Down ®
> > > > http://www.stores.ebay.com/jdpowertoolcanada
> > > >
> > > > "paul" <[email protected]> wrote in message
> > > > news:[email protected]...
> > > > > Thanks for replying.
> > > > >
> > > > > The brushes don't seem to be worn down to much. When I run the
saw it
> > > > > sounds different and I can see an arch going almost all the way
around
> > > > > the armature contacts. I will try some new brushes.
> > > > >
> > > > >
> > > > > "P©WÉ®T©©LMAN ²ºº4"
> > > > <[email protected]> wrote in message
> > > > news:<[email protected]>...
> > > > > > "paul" <[email protected]> wrote in message
> > > > > > news:[email protected]...
> > > > > > > Would bad brushes make the brake stop working. When I look at
the
> > > > > > > motor when it is running I see a lot of arching.
> > > > > >
> > > > > > Yes, for the electric brake to work the brushes have to be in
full
> > contact
> > > > > > with the commutator plates on the armature, if you continue to
use
> > the
> > saw
> > > > > > while needing the brushes replaced the arcing will pit & score
the
> > armature
> > > > > > so that even brush replacement will not reactivate the brush &
worse
> > still
> > > > > > you could burn out or shorten the life of the armature
dramatically,
> > for
> > a
> > > > > > $3.50 set of brushes that can be inspected & replaced yourself
don't
> > > > > > hesitate, remove the external caps & have a look.....if you have
> > trouble
> > > > > > locating a new set let me know we have dozens of pairs in
> > stock..Part #
> > > > > > 999-043. But there should be an Hitachi dealer near you.
> > > > > > A new brush is just over 5/8" (17mm) long if yours is less than
1/4"
> > (6mm)
> > > > > > or chipped or burnt on one edge replace them at once. The brush
> > spring
> > > > > > should pop out easily towards you, if you have to pry it out
then
> > you
> > know
> > > > > > for sure your problem is either a very worn brush or the brush
may
> > be
> > > > > > compacted in the brush holder with sawdust....either way the
> > electric
> > brake
> > > > > > will not activate properly.