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Old 11-01-2011, 12:45 PM
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Motor capacitors for Ammco 3850 lathe

I recently picked up an Ammco 3850 brake lathe and I'm looking for the part numbers for the two motor capacitors. The Ammco parts manual doesn't list the capacitors, only the motor as an assembly, and I'd rather buy a couple of $7 capacitors than a $400 motor. Of the two currently on the motor, one is a brand new oval replacment that doesn't fit in the cover and the other is too rusted to read any numbers. Thanks for any help.

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Old 11-05-2011, 04:30 PM
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OK, I'll try this a different way. Does anyone here have an Ammco 3850 or 3860 brake lathe, and if so, could you remove the covers over the two motor capacitors and post the part numbers of the capacitors? Thanks.
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Old 11-05-2011, 08:43 PM
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Having two caps would lead you to believe it's a start and run cap motor, but there's a chance one is a noise suppressor. I'd start by testing them to see if they're both either start or run caps, and to see if they're any good. From A.O.Smith:
Quote:
Capacitor Check (Start or Run)
Set ohmmeter at Rx 1K.
Slip a heavy piece of paper between points on the switch.
Discharge capacitor by touching the two terminals simultaneously with the blade of an insulated handle screwdriver
Attach one probe to each terminal. Ohmmeter needle should move rapidly to right then slowly drift to the left. (Low ohm reading to high ohm reading.)
If digital meter is used, readings should start low and rapidly increase to maximum value.
Replace capacitor if bad.
TIP: The replacement capacitor must be the same MFD as the original. However, if the same voltage rating is not available it is acceptable to use the next higher voltage. Example; if a 370 volt unit is not available, use the next rating, 440 volt.
If I'm reading the manual right, the motor is 1 HP. A start cap of 120-150 MFD up to 500 MFD can be used, depending on the start up torque load, so getting a start cap that works isn't going to be much of a problem- you basically are looking to get the load spun up in </= 2 seconds.

As for a run cap, see that it actually needs/uses a start cap to begin with. A 30 MF run cap is going to be in the ballpark. IIRC 1 HP motors generally don't use run caps (seen more on 1-1/2 HP-up)- but I'm sure there are exceptions.

http://www.gwrauto.com/brake_tools.html
http://www.relsmfg.com/Ammco_replace..._catalog_4.pdf
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Old 11-05-2011, 08:51 PM
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I saw this article while I was looking around.
http://dnr.louisiana.gov/assets/TAD/...P/hvac/d/d.htm
Hope this helps sort some of it out.
BTW what is the info on the motor itself?
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Old 11-06-2011, 05:26 PM
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Thanks guys, good info. The non-original replacement cap is a 7.5 mf, so that must be a run capacitor. Unfortunately this one is oval and won't fit under the cover - the original was round. The other appears to be original but is externally rusted and I can't read any numbers. Unfortunately the data tag on the motor is also difficult to read, but I'll try again with better light (and my reading glasses this time ).
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