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Tool Talk Discussion Forum

Air Pressure adjustment on compressor

Author  [Modern View]
Brent in IA

06-05-2014 05:36:12
170.54.58.4



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Hi all, I have a Puma upright 220/240v compressor that is rated at 150 psi max. It currently is shutting off at 90 psi and always has since new. I recently got a used tire changing machine and realized that 90 psi is a little low so wanted to increase to 120 or so but when I read the owner"s manual and went on their website it looks like they "preset" the pressure and don"t tell anyone how to reset. I have attached a picture of the pressure control and the two screws (red arrows) that I "think" would control the setting but wanted to ask some opinions before I starting messing with it...can anyone help?

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jimg.allentown

06-07-2014 08:18:51
98.115.105.174



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 Re: Air Pressure adjustment on compressor in reply to Brent in IA, 06-05-2014 05:36:12  
Keep in mind that the rest of the compressor needs to be rated to handle the increased pressure. Check the working pressure on the tank. Also look at the relief valve setting. If it pops off at 100 psi or so, you will also need to reset that for a higher pressure. You may also have to get a higher rated pressure control. Grainger sells them, and they are not all that expensive.



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Stephen Newell

06-05-2014 19:21:47
166.147.72.169



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 Re: Air Pressure adjustment on compressor in reply to Brent in IA, 06-05-2014 05:36:12  
The picture isn't very clear but I think the screws you are pointing to isn't the adjustment screws. Any pressure switch I've worked on the screw to adjust the pressure has a heavy duty spring under it.



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Bob

06-05-2014 20:03:01
75.234.206.100



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 Re: Air Pressure adjustment on compressor in reply to Stephen Newell, 06-05-2014 19:21:47  
"the screws you are pointing to isn't the adjustment screws. Any pressure switch I've worked on the screw to adjust the pressure has a heavy duty spring under it."

Stephen, you obviously haven't looked at/dealt with/adjusted pressure switches from "The Land of Almost Right"!

LOL!



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Ian Beale

06-06-2014 02:24:15
121.213.25.150



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 Re: Air Pressure adjustment on compressor in reply to Bob, 06-05-2014 20:03:01  
Bob,

Doesn't Microsoft have a patent on "the land of almost right"?



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gab

06-05-2014 15:05:14
50.103.20.111



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 Re: Air Pressure adjustment on compressor in reply to Brent in IA, 06-05-2014 05:36:12  
Any of those switch covers I ever had off had the instructions inside the cover.



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Steve@Advance

06-05-2014 12:45:08
108.245.66.82



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 Re: Air Pressure adjustment on compressor in reply to Brent in IA, 06-05-2014 05:36:12  
There should be a brand name and model # on the pressure switch. Should be able to find the info doing a search.

If not, one screw will be the pressure, the other will be the differential.

With the tank pumped up to 90, start turning one in, count the turns so you can put it back. It should come on within 2 turns. If not, put it back and try the other. Once you determine which is the pressure screw and which is the differential, you can fine tune it through a few cycles.

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Brent in IA

06-06-2014 06:27:02
70.198.34.240



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 Re: Air Pressure adjustment on compressor in reply to Steve@Advance, 06-05-2014 12:45:08  
That makes sense...like setting the fan temp offset in a hog building! Thanks.



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Russ from MN

06-05-2014 05:50:49
68.235.89.18



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 Re: Air Pressure adjustment on compressor in reply to Brent in IA, 06-05-2014 05:36:12  
Usually there are instructions inside the cover, that's a different switch than I am familiar with. Make sure you have a working safety pressure relief valve before you crank it up!



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