Does that model have an unloader valve, a 1/4" line going to the pressure switch?
If so, be sure it is working. When the pressure switch trips off, a lever pushes the pin in the unloader valve which relieves the pressure on the pistons for easy starting.
Before checking the caps, short across them with a jumper wire or screw driver to be sure they are discharged. If there is a pop, it just tested good!
To check the caps, give them a visual inspection. Usually a bad cap will have burned terminals, or a swollen case.
You can take them out of circuit and check them with an ohm meter. Set the meter to a high setting, connect the meter across the cap. The reading should jump to a low number, then bleed off to infinity. Reverse the leads, it should repeat the reading.
There is also a set of contacts under the end bell of the motor that connect the start cap to the start windings when the motor is coming up to speed. If the contacts are burned or not making connection for some reason, the motor will not start.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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