Starter Switch Problem If your motor begins to start your compressor, but slows down, stalls and then kicks the circuit breaker, you could have bad starter points. Try the following: Remove the end of the motor that has the wires entering it. This should be held on with 4 long bolts and nuts that run the length of the motor. Use a screwdriver and small hammer to gently remove the end cover. Under the cover, you will see a white plate that has the wire terminals. You should also see a round brown disc.
Extending from the round disc you should see a long slender piece of copper or other material, the size of a wooden coffee stirring stick. At the end of this stick are electrical contact points. Sometimes corrosion will build up on them. Take an emery file and file between the contact points to clean them. When the motor builds up speed, the small weights on the springs swing out and separate the points.
This opens the circuit between the starter capacitor and the motor. One of the round hump capacitors helps to start the motor and when the motor reaches high enough speed the weights and springs open the points and the starter capacitor then stops sending a charge to the motor. At this point, the other capacitor, the run capacitor continues to keep the motor running. If there is corrosion on the points, the starter capacitor never kicks in and helps the motor to start.
Change the Belt s. Do not over tighten belt, it will break the crankshaft or burn up a bearing. Compressors do NOT squeal when the belts slip. It sounds like the motor is slowing down but what is really happening is the belt is slipping. Motor HP Make sure you have the right motor pulling the Pump. If you have a V motor converted to , you may have lost some pulling power. If it is the wrong motor not matching the correct motor pulley you may be overloading the motor.
You may have an under-powered motor, or the motor is too small. Look at the amp rating on the motor plate and put an amp probe on the motor if and when it starts bogging down. The unit could be starved for power, have a weak ground, have low voltage, a poor connection or burnt contacts on starter or pressure switch etc…Amp probe will most likely show over-amping.
You could also have under size wire from panel or too long of a run on wire itself from panel. If you don't have an amp probe it's recommended to take the motor in to a local repair shop or have an electrician come to your house for further diagnosis. So, let's get started! Thanks for reading! Determine the volume of your air compressor tank in gallons. This should be clearly marked on the tank itself by the manufacturer.
Divide the tank volume by 7. The number that you get after the division is the tank volume expressed in cubic feet. Release the air from your compressor. Begin refilling the compressor with air. Record the amount of time that it takes to refill the tank while paying close attention to the compressor's tank gauge. You will need to record the psig pounds per square inch at two separate times in the refill process: once at the moment the compressor kicks in and once at the moment the compressor kicks out.
Take the psig indicated on the compressor's tank gauge when the compressor kicked in and subtract it from the psig indicated when the compressor kicked out.
For example, if the compressor kicks in at 75 psig and kicks out at psig then the difference would be 25 psig. Divide the difference between the two recorded psigs by The result will give you the amount of pressure added during the tank's filling cycle in terms of atm atmospheric pressure.
Take the volume of the tank expressed in cubic feet calculated in Step 2 and multiply it by the amount of pressure added during the tanks filling cycle in terms of atmospheric pressure calculated in Step 6. This is the number of cubic feet that your compressor pumps in the time it took for your tank to fill recorded in Step 4.
Convert this number to minutes. To do this, take the number of cubic feet found in Step 7 and divide it by the number of seconds it took to pump this amount. Multiply the result by 60 and you have the CFM of your air compressor.
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