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Old 02-25-2012, 07:10 PM   #1
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Inflating Tires Question

I have seen inflation instructions directing the use of a 12' extension with a clamping connection. I have a new motor home with new tires. I'm not experienced with high pressure tires. Is this good practice or were the instructions written by an attorney?

Thanks.
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Old 02-25-2012, 07:16 PM   #2
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I do use a short extension with a clamping connection, a gauge and a trigger. The clamping connection makes it easier to work with ~100 psi pressure hoses; you will get more accurate inflation pressures. The 12 foot extension, I believe, is recommended under OHSA for inflation of high pressure tires; IMHO it's not needed. Here's the sort of device I own: Amazon.com: Campbell Hausfeld MP6000 Tire Inflator with Gauge: Home Improvement
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Old 02-25-2012, 07:19 PM   #3
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Those instructions are increasingly common. Use of the 12 ft extension -- with the clamp to hold it securely on the valve -- is to protect you from harm or death should the tire explode.
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Old 02-25-2012, 07:23 PM   #4
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Written by an attorney, but there is a reason behind it. IF the tire ever did explode during inflation, it would very likely kill or main anybody very near it. Commercial tire shops that deal with these high pressures typically have a cage to enclose the tire "just in case". It's not a likely thing, but if you inflate big tires all day, every day you are probably going to run into one sooner or later.

In my opinion is is not a concern if you are adding air to your tires, i.e. it's already inflated to 90% of what it should be and you are topping it off. But if a tire had just been mounted or was dead flat and I was airing it up from scratch, a bit of caution would be wise.

Many years ago I had a freshly inflated tire explode when the jack was removed and weight applied to the tire. Let the floor jack down and turned to stow it away when the the tire blew out through the inner sidewall. It has dual that had been run essentially flat for a couple miles (to find a safe place to get off the road) after a valve stem failed and apparently that was enough to damage the sidewall structure.
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Old 02-25-2012, 07:32 PM   #5
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Check out this thread:

12' Lead on Tire Inflator - Do You Use One
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Old 02-25-2012, 09:24 PM   #6
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The reason is exactly as you said. It makes the lawyers happy. I have had one tire blow while servicing it. It didn't harm anything but my underdrawers. Really my ears rang for about two hours. It was a terrible bang. I have had motorhomes since 1974. and was a service man for nearly twenty years. I have serviced many, many tires. The only tire I would be afraid of would be a split ring. They will fly off and kill you.
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Old 02-25-2012, 10:47 PM   #7
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You know for 68 bucks, seems like money well spent. Made in USA too. Thanks.

http://www.tooldesk.com/automotive/M...h-15-Hose.aspx
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Old 02-26-2012, 11:37 PM   #8
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Can't make this up. Checked the air pressure. Between 76 an 80 pounds in each tire. Picked it up from the dealer and didn't even think to ask, "you checked the tires, right?" Think I did any damage to them?
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Old 02-26-2012, 11:45 PM   #9
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Can't make this up. Checked the air pressure. Between 76 an 80 pounds in each tire. Picked it up from the dealer and didn't even think to ask, "you checked the tires, right?" Think I did any damage to them?
That depends on what they are supposed to be using the tire manufacturers weight/pressure charts.
If low by 20% or more then the tires need to be inspected by a professional, might even have to inspect inside too.
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Old 02-26-2012, 11:54 PM   #10
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Chart behind the drivers seat says 90 for the rears and 111 for front. Suggestions?
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Old 02-27-2012, 12:09 AM   #11
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The chart is only correct if the rig is loaded to it's maximum rating. What are your actual weights, tire size and brand?
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Old 02-27-2012, 12:16 AM   #12
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I'll have to report back with that information.
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Old 02-29-2012, 02:02 PM   #13
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From the Owners Manual
Goodyear 275/80R/22.5 G670 RV Unisteel, Load Range H, radial tires
Max Speed 75
Minimum Pressure 90 S/5500 D/5080
Maximum Pressure 125 S/7160 (h) D/6610(h)
I don't know the weight of the rig, still have to go to a scale.
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Old 02-29-2012, 02:16 PM   #14
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Quote:
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The chart is only correct if the rig is loaded to it's maximum rating. What are your actual weights, tire size and brand?
So, I know it's not optimal, but is it SAFE to run those pressures as long as you don't exceed maximum weight?
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