I’m trying to fix my HILTI TE-72 hammer drill before work today. I know it needs brushes, and they’ll be ready to pick up in 1 hr. meanwhile, I’m afraid there’s another problem, because now can’t get the tool to respond with the worn brushes (it would before) and I’m confused about something:
with an AC test light, I found a good current through the power cord and switch, and down the two leads which leave the switch in the tool’s handle. These connect to “blade” type terminals on the tool’s casing when the whole thing is assembled. I was trying to find current beyond this point by opening up the brush access doors (1 on each side), squeezing the trigger, and probing the two clips that back up the brush springs. This got me no results. Then I remembered a safety feature by which a bit must be engaged with some pressure on the end for it to run. But this didn’t make it light up either, or run with the doors closed again. I also did a continuity test from each switch lead to each brush shaft, and got nothing. Isn’t that the normal path of current (switch to brushes)? Since both sides are “dead” at this point, I wonder if I’m missing something . Is the safety feature malfunctioning? am I doing it right? I don’t know much on this stuff, please advise. thanks
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Nope, you'd need to bridge the two normally open safety feature switches to get from the trigger to the brushes.
Phill Giles
The Unionville Woodwright
Unionville, Ontario