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Electrical troubleshooting Miter Saw

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Forum topic by Ben posted 10-14-2017 04:30 PM 225 views 0 times favorited 3 replies Add to Favorites Watch
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Ben

356 posts in 2691 days


10-14-2017 04:30 PM

I have a 10 year old Hitacho C10FSH.
Very good saw which is no longer made.

It started to run only intermittently, and the brake stopped working.
I replaced the brushes and the switch/trigger to no avail.

It’s been sitting in the corner of my shop for months. Today I went to clean it off and test if and it fired right up!
But only for about 3 cycles. Now it’s dead again.

Any ideas what the problem could be?

Trying to decide whether it’s worth putting any more money into. If it does run, there is a strange blade wobble upon startup, then it balances itself after a second.

I replaced the saw with a Makita (piece of junk in comparison) but it would be nice to have a chop saw at home when Makita is parked on a job site.

Thanks for any tips.

B


3 replies so far

View Loren's profile (online now)

Loren

9606 posts in 3482 days


#1 posted 10-14-2017 06:10 PM

I googled it and found this comment:

“This was the best tool in my shop for a while. I take special care of this saw. It now has some major problems – frequently it will not start. I have to raise and lower the blade guard and move it up and down. There must be a short in the electricl somewhere. As good as I loved it at the beginning – I would not buy another Hitachi product.”

Maybe that’s your problem.

View JCamp's profile

JCamp

472 posts in 384 days


#2 posted 10-15-2017 12:25 AM

Any chance the male end of the cord is going out? To me it sounds lik a short somewhere or a capacitor is going bad.
I had a remote control car (not the same as a saw I know) and it started only working in spurts. I took it apart and found that a ground had broken
If u aren’t afraid of ruining it a good first step would b to take it a part and check all the wire connections After that you’d probably hav to start testing all the components

-- Whatsoever thy hand findeth to do, do it with all thy might

View bigblockyeti's profile

bigblockyeti

4693 posts in 1554 days


#3 posted 10-15-2017 01:33 AM

Check the cord first after that brushes and switch are next probable (and most common) suspects. After that the condition of the commutator can be an issue as the brake on these saws powered by universal motors short the motor as a generator and are very rough on brushes and commutators. Any spade connectors can become loose over time with enough temperature cycling resulting in intermittent operation.

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