Skilsaw model 77 switch
Improper outlet voltage and/or grounding.Bad brushes or damaged commutator plates.If the motor hums or smokes, it's typically one of these problems: Do not run the tool if you suspect brushes, you can permanently damage the motor. If the motor arcs excessively (a little visible arcing is normal), the brushes may need replacing. You can sometimes get replacement switches at a reasonable price. If the switch feels funny and/or nothing happens when it is turned on, then it could well be a busted switch - which is pretty common.
Skilsaw model 77 switch cracked#
Some uniform case discoloration due to age and UV exposure can be okay - as long as the case is not also cracked or brittle.
Was the tool used until it might have become too hot? Many tools have a safety, over-temperature shutoff wait an hour for it to reset.Is a fuse or reset button present? Is it blown or popped out?.Are the plug contacts reasonably straight and untarnished?.On the power cord, is the insulation cracked at any point or is one or more strain-reliefs damaged or missing (especially where the cord enters the tool)?.Is the case discolored or cracked at any spot?.Has the unit been exposed to too much dust, ash, water and/or fine sawdust?.Is anything potentially jamming a mechanism?.With the unit unplugged and/or the battery removed: Here's a first-stab at a troubleshooting guide: