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Hello, (dh40mr hammer drill) using as a hammer breaker, using for a short while then a smell of burning (similar to burning clutch on a car). checked the brushes, they are fine. tool works (runs) but at a slow speed and very low power.
have you tried cleaning the armuture,where the brushes ride?take very fine sandpaper and clean until it is shiney.have you tried cleaning the armuture,where the brushes ride?take very fine sandpaper and clean until it is shiney.
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To Short carbon brushes or the electric field is not in balance look if one of the brushes is shorter then replace the electric field but if its on both brushes the same blue and burning smell then the armature has gone , beware of the price and great differences between the kind of hammers.
I would bet the armature is shot for sure and possibly the field. When an armature shorts out it usually gives off excessive sparking from the brush area. When a field fails it will usually run very slow if at all.
probable not worth repairing, if it smells then it got hot and might have melted the windings on the armature or field,, but take a look inside the handle area for any signs of burning and check the condition of the brushes before buying new one.
Exchanged Makita HP1640 hammer drill for a new one. The 2nd drill did the same thing in under an hour!! Will return for refund. Instructions say the Forward/Reverse switch must be in a full up or down position for the Hammer/Rotary switch to move; well, it is and the Hammer/Rotary switch still stops at a 1/2 way point between modes. Although I can still use the drill, instruction warnings say not to because it may potentially burn out the motor. I'll have to go with a different brand this 3rd time around. It seems to be a design flaw.
check the carbon brushes and the armatures commutator (also see if you smell anything burning)... if your thinking its the switch...open the handle and bypass the switch applying 115v directly to the motor wires that enter the load side of the swicth.
You have burned out the drill motor, it is shorted, the battery smoked due to a direct short, one thing I don't understand why the thermal limiter didn't trip in battery pack, I would contact manufacturer and try to get hem to buy you a new drill.
have you got it on reverse
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