old compressor

**knight2663** · 14th September 2010, 12:52 PM

have an old compessor been sitting for year in the weather, it had a pin hole in tank at bottom ..came to this site and looked up thread on welding up hole....after reading posts i felt reluctant to fix...I took out the end m.i.plugs put a match to it ,everything fine ,and welded said hole...... next problem .. start compressor and pressure builds up ..i am still in the test mode ...pull power plug out ....put power plug back in and the compressor doesnt want to start with out a bit of help ...i dont think it is a capacitor problem...infact i dont know........i just want the thing going with out pulling it apart... any-one know of this problem.......itsa 240volt three headed standard unit.....oh hi just joined so newbie good day to you ....knight2663

**munruben** · 15th September 2010, 07:40 PM

Hi and welcome. Could it be the tank is full of compressed air and the compressor wont start until some of the air has been used. My compressor cuts out when it reaches its maximum pressure in the tank and restarts when the pressure drops to a certain level..

**NCArcher** · 15th September 2010, 08:10 PM

Hi Knight,
it sounds like the unloading valve (the correct term escapes me at the moment) is not opening when the compressor stops. This valve releases the pressure in the cylinder head when the motor stops so that the compressor is not trying to turn against already compressed air when it restarts. You may need to replace the pressure switch as it is usually built into the base of the switch.

**Christos** · 15th September 2010, 10:00 PM

Welcome to the forum. Sorry not able to help with the compressor question.

**BEKKY** · 16th September 2010, 05:53 PM

I had the same problem with my compressor when it was new, the unloader valve didn't seem to do it's job.
Solved the problem by slightly loosening the pipe at the cylinder, ahead of the unloader valve, so that it leaked a small amount of air. Fixed the problem!!

Regards Keith.

**dakotax3** · 16th September 2010, 06:46 PM

Ours had a button on it you had to press manually each time you started it already pressurised. If there is a spring-loaded button on top of the compressor pump itself, press and hold down whilst switching on the power to the motor then release the button. Should work, seems it has already. This button is effectively a decompression lever.

**nosnow** · 16th September 2010, 07:16 PM

Hi
If it is a belt drive remove the belt and see if the motor starts & runs without load
Cheers Rod

**knight2663** · 16th September 2010, 07:21 PM

hi guys gals and thxs for the quick reponse ..only problem now is finding the time to look into your answers ... This valve releases the pressure in the cylinder head when the motor stops so that the compressor is not trying to turn against already compressed air when it restarts. This seems to be what you guys are hinting @ and will look into these ideas.. also a friend said to.... in large pully on motor ...thxs again guys.. give me few months to answer ,how i went......i jump from projects and start new ones... and in the end... i dont no where to start.. as there's too much on ...know the feel? thxs again matties

Thread: old compressor

Thread Tools

Search Thread

old compressor

Similar Threads

Turn your $99 GMC compressor into a $1200 compressor for $85 aud

Air Compressor - How to??

Which Compressor?

Compressor

Tags for this Thread

Posting Permissions