Question about Makita HP1500- Factory-Reconditioned 5 Amp 9/16" Hammer Drill

1 Answer

Drill motor runs at full speed as soon as plugged in

Just began this issue recently. I may have overheated this during a concrete drilling session.

The trigger does not control the motor speed. As soon as the cord is plugged in the motor starts and goes to full speed. The trigger has no affect and the little button to lock the trigger on is in the 'off' position.
Is this a brush issue?

The unit was purchased new about 11 years ago and sees household use.

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  • Anonymous Feb 19, 2009

    I took the outer case off and the switch had two little screws that looked like they held it together, but I couldn't get the switch apart? I think I would need to in order to replace it. I'll look again and check the e-parts schematics.

  • Anonymous Feb 19, 2009

    I took the case apart and the switch looks like it is in another case. I couldn't get this smaller case apart. I'll look again and check the e-parts schematics.

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  • Master
  • 2,176 Answers

I would have to think that it is more of a switch issue than brushes. If you remove one half of the handle do you see that the switch is burnt? But either way the current has to run thru it and if it runs when plugged in the contacts have welded shut to complete the circuit would be me guess. You can get a switch almost anywhere or go to Makitausa.com and order it direct. Let me know what happens please.

Posted on Feb 18, 2009

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