Anyway.I had it plugged it to a long 14ga extension cord, and I think I overheated the switch. Later when I took the handle apart to look at the switch, it looked like the bottom of the switch was cooked a little and the wires that are attached to the armature were melted at the switch, one of them was severed all the way through. Since I can't take the saw farther apart without alot more effort, I am asking if anyone knows if the armature wires can be replaced or are they molded into the armature? Do I have to buy a whole new armature if the wires are messed up? Megadeth Countdown To Extinction 20Th Anniversary Rar. Hi Augusto, Excessive sparking inside the rear vent holes is caused by an armature that has gone bad. The armature has shorted out and is now arching. The armature shorted out due to excessive load, usually caused by the type of work that was being done or by an extension cord that was too long and its wire gauge too small. Many times when an armature is damaged the field will be damaged as well. You will want to have the field tested to see if it was damaged. Unfortunately the armature and field have been discontinued for this version of the hd77 saw. L have owned and used this saw on construction sites, home repair and general wood cutting projects. It has served me well for 20 or so years and finally I must replace the trigger switch. The only maintenance ever done to it was to drain and replace the gear oil every two years, more often under heavy use. I have absolutely NO COMPLAINTS about my Skilsaw! I have used it with a diamond blade to cut cementious siding and ceramic floor tiles. #Skilsaw model 77 switch seril number hg796267 full#.
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