DeWALT DW938 TYPE 2 18V Cordless Reciprocating Saw Parts
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Discontinued
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JohnDC
I disassembled the saw, found nothing out of the ordinary, and the gear shaft input/gear box now seemed to move freely.
I tested the switch by putting a jumper cable across the battery inputs and found continuity across the brush leads when I pulled the switch. I did also find variable resistivity so it looks like the variable speed potentiometer (if that's what is inside the switch module) is working.
After reassembling the saw, I got no response from the motor when I pulled the switch.
This stumps me. The only thing I can figure out is a bad armature. Is there a good way to test it?
Here's a good way to troubleshoot that model saw.First remove both leads off the link removed a continuity meter check for continuity across the leads .If you have continuity across your leads then most likely you have a switch problem.If you don't have continuity across your leads follow each lead back to the brushes and across your armature until you find the open circuit. Though armatures do go bad on DC tools its rather rare occurrence.That model saw had problems with the brush connectors burning and melting causing that problem.It also had some problems with the brush spring mounts breaking taking the need pressure off the brush but you wouldn't notice it unless you look closely. Hope this helps.Good luck.
Tinker
