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Old 09-10-2010, 08:13 AM   #1
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Air Compressor / Tire Inflation

I have a fairly new air compressor (link to it on Sears Web) It is supposed to provide 125 psi. When I try to air up my tires the following seems to be the chain of events.

  • Trying to pressure tires to say 115 psi
  • Turn compressor on
  • Tank Pressure climbs to about 120 psi on its gauge then motor shuts off
  • Regulator cranked all the way in and it seem to follow the tank pressure
  • Put inflation chuck on tire and nothing seems to happen. No indication of air transfer.Tire pressure doesn't appear to increase and tank and regulator pressure hold at about 120 psi and motor stays off.
I would have thought that if the tire pressure was less than the tank/regulator pressure the air would flow to the tires and the motor would kick on when the pressure in the tank decreased.

I have had some success by putting chuck on when tank pressure starts to pass 100 psi but when tank reaches 120 psi the motor shuts off and it appears I might have gained a little ground but not much.

Am I missing something in the process of might there be a problem with the compressor, the chuck ... or???

Thanks,
Norm
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Old 09-10-2010, 08:25 AM   #2
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I just got the one from sears that looks like R2D2. It is 150 psi rated and seems to work well. I used it to blow up air mats and tubes for tubing the rapids etc. Be careful lest you ''over blow'' your tubes. One thing that I added is 50 feet of air hose. NOT THE CURLEY KIND because when you pull hard on it it will kink and bend ...... I run my tires at 100 psi cold. I use one of those ''truck'' type air guages to read the tire pressure and I have ''extenders'' on my valve stems. the next thing I will add is one of those ''air filler things'' that LOCKS on the valve stim so I dont have to sit there and ''press'' the filler to the valve stem. (I am kinda lazy)....
Now if I could just figure out how to get Willa to be in charge of the tire pressure, life would be complete .....lol...
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Old 09-10-2010, 08:25 AM   #3
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The regulator will cut off at 120 PSI as noted, but it won't come back on until some lower pressure - 105 or 110? Thus you have a problem. You can pull it down until it reached pressure and then get a little air into the tire, but it will take for ever. Exchange AC??
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Old 09-10-2010, 08:58 AM   #4
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Can I ask what mh do you guys have that requires such high pressure for the tires?
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Old 09-10-2010, 08:59 AM   #5
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The trick with "most" tire compressors that have tanks is that there is a rating for when the compressor kicks back on. If yours tops out at 120 psi then the turn back on point is probably as low as 80 - 90 psi. The easiest solution is to pull the release valve so that the tank goes down to the 80 - 90 level and kicks back on. It will then pump back up to 120 again and turn off. Generally if your tires only need 100 psi then you have enough spare air in the tank to top out the tire. You may have to go through this procedure for each tire. :( If you need 115 psi then you don't have much extra air to top up the tire.. You may need to go to a compressor that makes 140 psi or more.
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Old 09-10-2010, 09:27 AM   #6
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Your compressor is just not large enough to handle the psi that you want. I bought this one and I can air 22.5 tires easily:
Porter Cable 150 PSI, 6 Gal Oil-Free Pancake Compressor

If you do a google search you may find it at a better price and you can also buy this model as a refurbished one from some sellers. Joe
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Old 09-10-2010, 09:30 AM   #7
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Quote:
Originally Posted by ninos View Post
Can I ask what mh do you guys have that requires such high pressure for the tires?
Any coach with 22.5 tires. Joe
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Old 09-10-2010, 09:44 AM   #8
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I also use this Porter Cable 150 PSI, 6 Gal Oil-Free Pancake Compressor and have been very happy with the performance.
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Old 09-10-2010, 09:57 AM   #9
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I know this does not answer your question but this is what I use. Amazon.com: VIAIR 300P Portable Compressor: Automotive My tire size are 22.5 and I maintain my pressure at 100 psi. I have, by accident, gone up to 110 psi in one tire. 12VDC, quiet, lite, small, fast and easy to pack. Well built with nice carrying case.

The only hang up that I have, it's another American product made in China.
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Old 09-10-2010, 07:44 PM   #10
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I also use the Porter Cable pancake compressor rated at 150 PSI. Mine will go to 150 psi and then shut off --- when it is off, the air in the compressor tank is being pushed into the tire. My compressor starts back up at 120 PSI so every now and then, I will release air from the compressor to make it come back on. I run my rear tires at 110 PSI and my fronts at 100 PSI.
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Old 09-10-2010, 09:30 PM   #11
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Why do you need a compressor

Seems like many of you have coaches with air brakes. These usually have a takeoff point where you can get air from the coach. Mine even came with an air hose and chuck.
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Old 09-11-2010, 08:04 AM   #12
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Quote:
Originally Posted by EasyDoesIt View Post
Seems like many of you have coaches with air brakes. These usually have a takeoff point where you can get air from the coach. Mine even came with an air hose and chuck.
Yah know.... I saw a fitting like that in the generator compartment and I thought wow...what a great idea for keeping the tires aired. I called Newmar and they confirmed it was a compressed air fitting but then offered it was only good for blowing up air mattresses, bicycle tires, etc.

Now I am wondering.... Is there a regulator upstream that regulates the downstream pressure on that takeoff. If not then wouldn't the pressure at that takeoff be the same as indicated on one of the air brake gauges on the instrument panel?

Maybe a call to Spartan might be a better idea.

Norm
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Old 09-11-2010, 08:28 AM   #13
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The air fitting has no regulator, but many have reported there is not be enough air pressure to top off their tires.

You will need to run the engine until the engine air compressor cuts out to reach max pressure.

I didn't bother to try and bought the Porter Cable 150# air compressor which works well.
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Old 09-11-2010, 09:12 AM   #14
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I also found that it doesn't deliver enough pressure to do the tires properly. Joe
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