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  • #16
    loose nut , Like said above, take the back cover off the motor and have a look. It is easy and simple, just go slow and easy with things. In most cases the cover will slip off easily after you remove the four through bolts. If it does not slip easily you can GENTLY tap it off with a dead blow hammer or any edge driving tool. Just go easy and rock from side to side. When the cover comes off make sure to keep track of any load springs that are between the bearing and the cover. They often stick to the grease on the bearing and then get lost when you are not looking . After that the switch is between the bearing and the rotor. There are several different designs, but all have a moving centrifugal activator and a switch with a lever that is pushed by the moving activator. The switch may be bad or the activator may be bad or stuck. I have seen many in dusty areas that have gotten stuck with grease and dirt over time. A simple cleaning and new grease and it is good to go. Keep us posted!!!
    Robin

    Happily working on my second million Gave up on the first

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    • #17
      Dad said to check your head unloader.
      21" Royersford Excelsior CamelBack Drillpress Restoration
      1943 Sidney 16x54 Lathe Restoration

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      • #18
        If the switch is ok, the unloader, as said above could cause the motor not to start because the head still had a load against it. If you can always get it started by spinning the belt it is probably a stuck switch at this point.

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        • #19
          Originally posted by loose nut View Post
          Centrifugal clutch or switch that is used to energize the start winding of the electric motor. Sorry for the confusion.

          I figure the "switch" is stuck in the run position so the motor just hums but I can start the motor by giving the belt a pull and switching the compressor on why the motor is still revolving.
          Single phase AC does not generate a rotating magnetic field without help. When the coils are powered up at start there is no directional control so it tries to hold position, once in motion it will continue in that direction.

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          • #20
            He said the it would start with no pressure in the tank, but if the tank had pressure it would not start. If it pumps up to full pressure and shuts off the the built in unloader in the pressure switch does its thing and releases the head pressure. It it shuts off prematurely, then the unloader does not get to do its job and the head pressure is too much for the motor to overcome. Is this s single or dual capacitor motor? They do make an inline unloader that relies on air flow to close it and when the air flow stops, it automatically opens and bleeds off the head pressure. Have you put an ammeter on the line in when it is trying to start? If it was the starting circuit in the motor, it seems like it would not start even with the belt off. If it was a bad tank check valve, then at full pressure, the unloader would drain the tank. A conundrum!!
            Peter
            Grantham, New Hampshire

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            • #21
              The motor will start with pressure in the tank, pretty sure it is the switch.
              The shortest distance between two points is a circle of infinite diameter.

              Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

              Southwestern Ontario. Canada

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              • #22
                I have already watched that vid. I know the basics of how they work, just need to get the nerve to do it.
                The shortest distance between two points is a circle of infinite diameter.

                Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                Southwestern Ontario. Canada

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                • #23
                  As said above, it's not that hard. Just take it slow and easy. Be careful when pulling the end bell off the shaft, you don't want to lose any of the washers that may be stuck to the bearing. Inspect the contacts on the switch. If they are good, inspect the actuator movement. Not much to do there other than cleaning it up and checking for broken parts, springs etc. Motor parts are available online.
                  “I know lots of people who are educated far beyond their intelligence”

                  Lewis Grizzard

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                  • #24
                    I took a look at it today.

                    It has a one piece sheet metal guard and it has to go to remove the belt and pulley which is necessary to remove the motor. The belt and pulley need to be removed first but to remove the belt and pulley the guard needs to be removed first,. Who designs this $#!~+
                    The shortest distance between two points is a circle of infinite diameter.

                    Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                    Southwestern Ontario. Canada

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                    • #25
                      Originally posted by loose nut View Post
                      I took a look at it today.

                      Who designs this $#!~+
                      Someone that was given the task of designing an air compressor with a very low target wholesale price.
                      Any piece of simple machinery can be easily designed and manufactured "better" then what you have.

                      More efficient
                      Longer lasting
                      Quieter
                      More easily maintained
                      Smaller
                      Far more costly

                      As a humorous side note, for 10 years or so I did a good deal of machine work for a large Pharma. distribution center, a sort and pick order operation. This place had a good deal of old conveyor/packaging equipment that used pneumatic controls spread all over the 100,000 sq. ft. building.
                      After years of operating 24/7 there were so many small air leaks that the 25 hp screw compressor could not keep up.
                      Finding and fixing the thousands of small leaks would take a great deal of time and also shut down sections of the process for repair.
                      So they simply bought a 50 hp screw compressor and ran both at the same time, problem solved.
                      Last edited by Bented; 04-03-2021, 08:06 PM.

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