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Tool Talk Discussion Forum

Sears air compressor/ tire changer.

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Doug in Illinoi

04-20-2007 15:19:52




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Need advice and opinions as to whether I can get away with turning my compressor up just slightly. Sears wants it to kick off at 125PSI, it will kick back on at 95PSI at factory settings. I turned it up one half twist on the adjustment screw and am coming up with 133PSI shutoff and 110PSI back on. I feel still within safety limits for both compressor and tank as only 8PSI higher than stock. Right or wrong? Will be buying a rim clamp tire machine when I find one at the right price. They spec out needing 8 to 10 bar for air supply. Looking at one of my tire testers, 4 bar is about 58 psi, 1 bar is about 14.2 psi. Therefore 8 bar should be 58x2= 116, 14.2x10=142. Regarding air needed, once machine is here, if not enough PSI to run right, could I tweek another 3 to 5 PSI and still be safe? Thanks

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Hobo,NC

04-20-2007 17:58:19




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 Re: Sears air compressor/ tire changer. in reply to Doug in Illinois, 04-20-2007 15:19:52  
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Most of'em need 14 to 15 CFM @ 150 PSI and a real 5 HP motor, you need more compressor. Your pop off izz probably gonna pop off B-4 you git the pressure were you need it. then you will not have the air supply to run the machine, then you will burn the motor up on the compressor. You are gonna need a 2 stage compressor money well spent. I run 175 PSI and don't know how I would live with out it. I have a old sears 9 CFM that I changed out the motor to a real HD 1 1/2 motor and had a machine shop make a pulley twice the original size. It will not keep up with me. I had planed to use it as a back up if the Emglo compressor went down. I have picked up a back up and compressor poor at this time.

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Doug in Illinois

04-20-2007 18:58:56




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 Re: Sears air compressor/ tire changer. in reply to Hobo,NC, 04-20-2007 17:58:19  
Will take everything you said into consideration. I am trying to get by marginally, as am getting forced into it. USPS is using an outdated formula for paying us our mileage, we are now getting less allowance than postmasters or other postal employees are getting as our mileage is based on the gov't issued private transportation cost index. Was getting within 4 cents per mile what we are now when gasoline was less than a dollar a gallon. Just looking to cut every corner I can as my fuel cost per mile is thru the roof and everything else is also much higher. USPS has told our union, too bad, you are bound to the contract. How nice, we are on a contract extension since 2002, and the other unions are also getting paid more than us and have come to new contract agreements with pay increases, etc. Our proposed new contract increases put us behind the curve of the other postal unions, let alone the mileage issues. Don't mean to unload on you, just need to cut costs everyplace I can, as my tire and repair costs are going up up up along with fuel and vehicle repair costs. Thanks for the rapid response.

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TimV

04-20-2007 15:58:59




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 Re: Sears air compressor/ tire changer. in reply to Doug in Illinois, 04-20-2007 15:19:52  
Doug: I'd be more concerned with the CFM requirements of the tire changer than the PSI. Sounds like the tire changer is set up to use "shop air", which tends to run between 90-125 PSI, and is fairly standard. Rather than turn up your compressor, I'd check the CFM requirements of the tire changer and make your decison on whether an upgrade is warranted from that.



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shannon from ohio

04-20-2007 15:30:34




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 Re: Sears air compressor/ tire changer. in reply to Doug in Illinois, 04-20-2007 15:19:52  
If relief valve don't blow off (release air first) Tanks are usually hydrotested to 300 psi.Usually you'll be safe if tank is in good shape "Keep drained of water,etc" But check pop-off pressure on the relief valve (It is stamped on them) Relief valve usually has a ring similar to a keyring on them..... ..... .. BE SAFE AND DON'T OVERDO THE PRESSURE.....



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Doug in Illinois

04-20-2007 15:45:45




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 Re: Sears air compressor/ tire changer. in reply to shannon from ohio, 04-20-2007 15:30:34  
Yes, relief valve works fine. Thank you for helping put my mind at ease.



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