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My H65 electric jackhammer suddenly stopped hammering.It just hums?

It just hums and then makes a funny smell. I just replaced the bushings. What usually causes these to stick?
dan cook, May 2010
Dear Dan, If was you mate, I'd take it to an electrician and ask him to check the thing. I was going to sugget brushes but you've already done that so it sounds like it's either arcing due to lose connections ;or something else wrong mate. Look on net for faults regarding this unless oyu have already but I think it sounds like a sparky needs to check it.

Anthony Tovey, September 2010