hf dust collector motor goes bust. now what?

[skamath]

i think the voltage was 125V

mine is 77IV i think and it measures to 9999uF. sorry forgot to mention that.

on the motor, there is a cover held by bolts. i didn't want to open it until i knew i had to.

the cap is 400uF, so given it is within the multimeter's range, shouldn't it have measured the right value?

[LCHIEN]

mine is 77IV i think and it measures to 9999uF. sorry forgot to mention that.

on the motor, there is a cover held by bolts. i didn't want to open it until i knew i had to.

the cap is 400uF, so given it is within the multimeter's range, shouldn't it have measured the right value?

no idea why. The resistance test behaves properly. It would be highly uncommon/improbable for a capacitor to significantly increase in value. Usually they fail dead short or dead open.

I still think its the centrifugal switch, anyway.

[Tom Slick]

Mcmaster-carr sells start caps.

[skamath]

so finally it turned out to be the capacitor problem.

i bought a new one from the local grainger store since it fit fine inside the bump. also this new one measured 508uF (as opposed to the bad one measuring OL).

i have couple of follow up questions:
. this new cap has a range of 400-480, and seems to measure 508. is this a suitable replacement for the original 400 one?
. do i need to insulate the capacitor within the motor bump? the old one had some parchment type wrap and plastic end caps on both ends.

btw, thanks for all the help. you guys have been great! hope i don't have any more problems with the DC.

Mcmaster-carr sells start caps.

[LCHIEN]

so finally it turned out to be the capacitor problem.

i bought a new one from the local grainger store since it fit fine inside the bump. also this new one measured 508uF (as opposed to the bad one measuring OL).

i have couple of follow up questions:
. this new cap has a range of 400-480, and seems to measure 508. is this a suitable replacement for the original 400 one?
. do i need to insulate the capacitor within the motor bump? the old one had some parchment type wrap and plastic end caps on both ends.

btw, thanks for all the help. you guys have been great! hope i don't have any more problems with the DC.

+/- 20% or more is not unusual for larger value capacitors. I think it'll work fine. if the old one was insulated you should probably insulate the new one.

Glad you figured it out.