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Hitachi VTV-18 110v drill. Excessive sparking

Hitachi VTV-18 110v drill. Excessive sparking from one brush when drill approaches top speed.
Have cleaned comm and removed/inspected brushes which appear very little worn and with good spring tension. Sparking not excessive until high speed reached then one brush begins to 'flare' as though brush riding off comm.

Any help gratefully recieved, thanks.

Graham illsley.

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 104 Answers

SOURCE: brushes

well i use to rely on makita and Campbell Hausefield and because I used them a lot - I always had a set on hand - I as a general rule would not run them below 75% wear- go to their web sit and check - be advised that as the armature wears- you will get less mileage from brushes. Best of luck. Oh replace them is you are in doubt-this willprevent bunrout on armature

Posted on Oct 16, 2008

  • 2176 Answers

SOURCE: motor brushes spark like crazy!

If you already replaced the brushes you could have a couple problems, the least is the armature commutator needs cleaned and the more expensive is that it needs replaced. This is a problem unless you want to tackle taking the motor partially apart. Let me know what route you want to take either a repair center or looking at the commutator.

Posted on Jan 14, 2009

  • 14 Answers

SOURCE: sparking

sounds like the stator is damaged. that is the shaft that the brushes rub on. unfortunately this usually means time to buy a new saw. since you really don't have much to loose, you can tear the saw apart and pull the stator shaft out and sand the copper area and smooth out any rough spots or nicks.Ultimatley you would want to chuck it up in a small lathe and turn it down a hair.this would ensure that you stay even all the way around. but most people don't have a lathe so just put it in a vise and take some 120 grit sand paper,preferably narrow strips about 1inch thick and start working your way around.

Posted on Jan 18, 2009

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SOURCE: exesive sparking

Couple things, I would first take the handle half apart (if there one) and look at the condition of the commutator. Second make sure the brushes are fully seated. What happened to the old set of brushes, why did you replace them. Are the brushes you bought made for this tool? Sometimes when replacing the brushed the commutator has to seat them. THis is tricky unless you know what you are doing. Check on the items I suggested and get back to me and lets see what else we can look at. One more thought on the armature commutator how do the bars look, are they all pretty much the same or do you see some that are raised above others, if so the armature is bad and needs replaced.

Posted on Feb 18, 2009

  • 2176 Answers

SOURCE: cant figure out how to remove brushes

go to and in the middle of the page at the bottom type in your model number and it will take you to a page so you can bring up a schematic on this tool. let me know if you need any more help

Posted on Jun 10, 2009

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