1/2 Masterforce Hammer drill losing power

SDE · Aug 24, 2014

I took the drill apart. The part that the brushes push against (commutator?) was dirty. I cleaned the brushes and that other surface with 320 sandpaper and cleaned them with Lacquer thinner. I re-assembled the drill and after a few minutes of operation, and allot of arc-ing it quit again. The commutator was black again. Are the brushes shot? What next?
thank you
SDE

IH2444 · Aug 24, 2014

Perhaps it is shot or the brush springs have lost their tension.

will in texas · Aug 24, 2014

if the brushes are at least 3/4 inch long the armature is bad look for burn spots between the copper bars the brushes run on before cleaning and bearing can cause it but brushes first then armature replace i rebuilt a many of hand tools air and electric some times the old tool is so far gone to repair

Steve@Advance · Aug 24, 2014

The armature is shorted internally. Most likely not practical to repair.

Geo-TH,In · Aug 25, 2014

Take it apart again, use something very thin and clean out the carbon between segments on communtator. I use emory cloth to polish communtator. I have used tooth pick, razor blade, then use air. If you still have flash over, you need a new armature.

I just cleaned my 18v dewalt. Communtator was black, flash over all around. Drill came to a stop and started smoking. If wires on armature are black and smell, good chance it fried.

Mostlikely cheaper to just buy a new drill.
George

1/2 Masterforce Hammer drill losing power

SDE

Well-known Member

IH2444

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will in texas

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Steve@Advance

Well-known Member

Geo-TH,In

Well-known Member

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