Simon_CSK Posted June 21, 2015 Share Posted June 21, 2015 I have a compressor in my garage to power air tools and it has decided to fail on me. I spent some time yesterday testing the electrics but only made slight progress. After wiring in a new feed the compressor started to fire up and immediately died. I an not too sure if it is electrical or mechanical but certainly the drive belt turns reasonably refeely so I am guessing it is electrical. Can anyone give me pointers? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 21, 2015 Share Posted June 21, 2015 Pressure switch closed when tank empty? Quote Link to comment Share on other sites More sharing options...
simonr Posted June 21, 2015 Share Posted June 21, 2015 Starter Capacitor. Bowie could easily be right too! Si Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 22, 2015 Author Share Posted June 22, 2015 Pressure switch closed when tank empty? Is this easily replaced? Starter Capacitor. Bowie could easily be right too! Si It does breifly start surely it would do nothing if this was away. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 22, 2015 Share Posted June 22, 2015 Does it look anything like this : Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 23, 2015 Author Share Posted June 23, 2015 Does it look anything like this : Looks like the middle one right under the play button. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 23, 2015 Share Posted June 23, 2015 Then yes, you should be able to find matching unit on Ebay, it's just unions, and 4 wires. You may find that it's just dirty contacts, so be worth looking at it by disassembling before deciding to replace. Start capacitors can be temperamental things though... Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted July 12, 2015 Author Share Posted July 12, 2015 Ok so now I have the new pressure switch only to find that the feed pipe in the bottom has a smaller thread than the one that was on. Can I get an adapter or do I need a different pressure switch? Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted July 13, 2015 Share Posted July 13, 2015 Take the switch and pipe pneumatics supplier and they will sort the adaptors required. They can go from anything to anything even if they have to put something inbetween. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 13, 2015 Share Posted July 13, 2015 Yup as above, normally very easily done. Quote Link to comment Share on other sites More sharing options...
cackshifter Posted July 19, 2015 Share Posted July 19, 2015 It may not be electrical; compressors usually have a check (non-return) valve at the point where the air is pumped into the tank. When the compressor stops, there is usually some way of removing the pressure in the delivery pipe, the air in the tank can't escape because of the check valve. When the pump starts, it's not starting against tank pressure. If that check valve sticks, or the unloader mechanism (often part of the pressure switch) fails, it tries to start against the residual pressure in the pipe, and that can be a challenge to some motors. I have discovered my compressor has a permanent capacitor motor, ie no start cap, and relies on this to get going. If it doesn't unload properly, when it comes to start it tries for a moment then trips the starter. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.