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-   -   March 809 Motor Capacitor/Disassembly (http://www.homebrewtalk.com/f11/march-809-motor-capacitor-disassembly-390663/)

ImMrAwsome 02-17-2013 01:50 AM

March 809 Motor Capacitor/Disassembly
I have a March 809-PL-HS. It seems to have lost most of it's power. When I plug it in, it just buzzes and heats up. I took off the pump part to take the load off of the motor. When I plug in the motor, and spin it by hand, it takes off like normal. When I hook the plug up to my multimeter, the resistance jumps all over the place.

Looking around the internet, this seems to be the symptoms of a bad capacitor. So...
A.) Does this motor even have a capacitor?
B.) Has anyone successfully gotten the motor out of the enclosure?


oaeiceman 02-17-2013 05:16 AM

The capacitor is usually located under a metal cover that is on top of the motor. It's easy to spot. Caps are dangerous , and you need to discharge it before removing it.

ImMrAwsome 02-17-2013 02:51 PM

1 Attachment(s)
My pump doesn't have a metal cover, or one of those boxes attached to the side. Does that mean I don't have a capacitor?

Looking inside the motor, I see a silver box-shaped thing.

day_trippr 02-17-2013 03:13 PM

I'm not sure what the arrow is pointing at, but if that is a capacitor, it's for noise, not starting.

I looked at a March 815 assembly diagram and if there is a start capacitor it has to be inside the cylindrical housing itself. And it would be big enough to easily notice - that arrow isn't pointing to anything that fits that bill.

It wouldn't surprise me that there is no start capacitor in these motors...


IslandLizard 02-17-2013 03:48 PM

I have an 809 HS and it has quite a bit of momentum/power when starting up. From the outside I can't see a capacitor inside the housing, or even the room for one.

Measure the resistance of the coils. I measure around 9.0 ohms across the plug (analog meter).

Once you start it with a hand spin, does it have power? If not, there maybe excessive friction on the bearings or a burned out coil/loose wire.

ImMrAwsome 02-17-2013 03:55 PM

The resistance across the plug jumps all over the place, which is why I thought it would be a bad capacitor.

The only way I can hand spin the motor to start it, is with the pump off. So, I hand spin it (it then works fine), and then I place the pump housing over the spinning magnet, and it works fine.

SmokeNbrew 02-17-2013 04:07 PM

I doubt this motor has a starting capacitor, given its size. Curious, does this motor have replaceable brushes?

ImMrAwsome 02-17-2013 04:09 PM

No. It's an induction "Squirrel-Cage" motor. It has no brushes.

IslandLizard 02-17-2013 04:09 PM

That silver box-shaped thing might be a thermal sensor/safety switch.

You need to make good contact when measuring resistance. Clean the plug spades and measuring probes well. Digital meters tend to "jump" because they have to latch the readings in intervals, it's not a "real time" read-out.

When you plug it into the mains, do you feel the shaft vibrate? Like a small but rapid back and forth motion.

ImMrAwsome 02-17-2013 04:16 PM

I cleaned the plug and leads off with alcohol.

When I plug it in, it hums. I don't feel an actual back and forth as much as an overall vibration.

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