DeWalt DW621

[631965]

Hi,

Can anybody help with this please.

I have a DW621 which suddenly stopped working! I have replaced the brushes but this hasnt made any difference. The motor doesnt smell as if it's burnt out. I had it running once by running a feed directly to the connectors next the brushes. But it doenst seem to run anymore. I am running out of parts to test, could the motor be at fault. How do I check the motor? I know a feed is getting to the brushes.

Is there a known fault with the tool?

Thanks.

[Tinkerdave]

It sounds like you have a break in the field.The field can be tested with a ohm meter .

[amazontoolrepair]

Like Tinkerdave said, its portably a break in the field, but it could also be the armature.

Use a continuity tester, with the motor assembled, check for continuity from the white wire going in, to the black wire going in. You should have continuity between the two, if you don't, proceed with the following tests. If you do, then the motor is not the problem.

Using a continuity tester, put the probe on the contact of one side on the armature, then put the other probe on contact of the opposite side on the armature. If you have continuity across the armature then the armature is most likely good. If you don't, then the armature will need to be replaced.

Now check continuity through the field. You will see where the electrical input goes in the front of the field, pick a side (right or left), put the probe on the input, around the back of the field (on the same side) would be the output. You should have continuity from the front to the back of the field on one side. Then do the same thing to the opposite side. If you do not have continuity on one or both sides then the field would be to be replaced.

If all tests passed, check your brush holders.

Hopefully this helps.
-Ian