Reply by exelectrician

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Posted on Do I need a new start capacitor?

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2327 posts in 2455 days

#1 posted 11-07-2012 08:17 AM

Wow (comment deleted)

The fault IS IN THE STARTING SWITCH this is a centrifugal switch which is usually located inside the motor on the opposite side to where the shaft sticks out.

Take off the fan cover, the fan, the end cover on the motor, and there is the switch. it has a spring which keeps the switch on, when the motor is not running. Put an ohmmeter accross the contacts – the ohms should be 1/2 ohm or less, (the start windings are controlled by this switch) when the motor gets to half to 2/3rds full speed the centrifugal action kicks in and the switch switches the start windings off.
If this contact in not switched on when you test it, you can buy a new one. I would just tweak the contacts with a pair of needle nose pliers. Note; silver contacts always look black and burned, do NOT sand or clean them excessively, try and preserve what silver is left after 15 years of use you have had out of them.
If you have one of the newer digital electrical testers you will be able to check the capacitance of the cap. Should be in the range of 100 – 200 microFarads.

There should be NO loose wires that can get caught up in the action of the switch when you reassemble the end cover of the motor.
Let me know if this works for you.

-- Love thy neighbour as thyself

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