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19th March 2021, 05:10 PM #1
Replace Brushes - Easy Fix that saves $00
I was given a used Hitachi Rotary Hammer Impact Drill with SDS head about 12-13 years ago and it has been a dream to use. Eats through masonry like butter.
While using it last weekend , it just stopped dead. I had a suspicion what the problem was...worn Brushes or that's what I hoped as I didn't want to fork out $300 - $500 for an equivalent work horse drill.
So this afternoon I popped down the shed, removed the cover and pulled out the brushes holder. Both were worn but one in particular had a metal piece poking through the carbon. Luckily there is a power tool outlet around the corner from my shed. Less than $12 later I had a new set of brushes. It took me a couple of minutes to install the new brushes then I plugged it in and.....RRRRRRRRRRRRRRRRR...away it went.
Roared into action and gave me a great feeling that it could be in use for another 15 - 20 years. The bloke at the outlet said that he found it surprising how many people just throw away their motorised tools when they stop because they don't know it could be an easy, cheap fix. Power tool motors are not complicated beasts. Good quality tools will last years with a minimum of maintenance and the replacement of these brushes that are designed to wear & replace.
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19th March 2021 05:10 PM # ADSGoogle Adsense Advertisement
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21st March 2021, 10:01 AM #2
Must be common on hammer drills to have a small pin that pops out of the brush when they get very low that stops them operating and prevents them causing damage to the commutator should they wear down further. I had the same thing happen years ago when I borrowed a drill from work.
Dallas
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21st March 2021, 12:11 PM #3
Treecycle,
Yes that little post did just as you describe. Once the brush wore down to the post it didn't allow any further wear to reach the commutator.
A bit like a wear indicator on a tyre.
There was no fazing out period either. The motor didn't slow down over time...one moment working, next moment not.
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21st March 2021, 08:52 PM #4GOLD MEMBER
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the thread title reads like it saves you zero dollars
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22nd March 2021, 11:35 AM #5
Replace Brushes - Easy Fix that can save several hundred dollars
I was trying to make it look like several hundred dollars but without an exact amount. I'll see if I can reword it.
Maybe too late now.
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