Air compressor pressure switch adjustment. - 460 Ford Forum
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post #1 of 6 (permalink) Old 07-13-2007, 06:18 PM Thread Starter
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Air compressor pressure switch adjustment.

How do I adjust the pressure switch on my air compressor? There is a large spring with a nut on it, and a small spring with a nut on it right next to the large one. I want more pressure in the tank. Which one do I screw in/out? Just seeing if anyone knows before I start expiramenting.

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Tim
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post #2 of 6 (permalink) Old 07-13-2007, 06:45 PM
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Spring

The tighter the spring the more pressure it will make.So turn it clockwise.
Bob
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post #3 of 6 (permalink) Old 07-13-2007, 06:48 PM Thread Starter
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w

Which spring? The big one or the small one or both.
Tim
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post #4 of 6 (permalink) Old 07-13-2007, 06:52 PM
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what type of compressor do you have? I have an ancient westinghouse 3yc industrial unit, and the switch you describe sounds similar. The big spring in the center of my switch is acted upon by a diaphragm that is plumbed into the tank. Tightening that spring will raise the pressure required to break the electrical contacts in the switch, giving you more psi. Be careful though, I played with mine before I knew anything about it, and it took a couple hours to straighten out. My unit was set up to come on at 200 psi and cut off at 250, so it took some tweaking to get it to run lower. I have it set to come on at 90 and cut out at 175. I guess my best piece of advice is to make small adjustments, and make a record of how many turns you move everything from stock. That way you can always get back to where you started if things get confusing.
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post #5 of 6 (permalink) Old 07-13-2007, 06:52 PM
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The second spring may be a differation adjustment. Meaning you can adjust it to kick in when the tank gets to a certain pressure. example ; max pressure is 110 and when it drops to 90 thecompressur kicks back on.
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post #6 of 6 (permalink) Old 07-13-2007, 08:21 PM Thread Starter
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ok

Ok, thanks for all the help. I will make small adjustments and see what happens.

Tim
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