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02-25-2012, 06:10 PM
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#1
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Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 87
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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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02-25-2012, 06:16 PM
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#2
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Senior Member
Official iRV2 Sponsor
Join Date: May 2011
Posts: 8,305
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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
__________________
Joel (AKA docj)--
RV Technology Specialist
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02-25-2012, 06:19 PM
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#3
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Senior Member
Join Date: Jul 2011
Posts: 221
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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.
__________________
[B]BichonLover is a 100% California gal, driving a vintage Fleetwood in SoCal.
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02-25-2012, 06:23 PM
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#4
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,704
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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.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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02-25-2012, 06:32 PM
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#5
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Senior Member
Tiffin Owners Club Workhorse Chassis Owner
Join Date: Oct 2009
Location: Warner Robins, GA
Posts: 2,613
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__________________
Jon & Sue Francis (Retired U.S.A.F.)
Lil Girl-Rescued, Abby Rescued, Peaches Rescued
06 Allegro 35TSA Workhorse Chassis
2013 Chevy Spark Dinghy
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02-25-2012, 08:24 PM
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#6
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,932
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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.
__________________
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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02-26-2012, 10:37 PM
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#8
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Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 87
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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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02-26-2012, 10:45 PM
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#9
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Kevin123
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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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.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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02-26-2012, 10:54 PM
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#10
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Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 87
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Chart behind the drivers seat says 90 for the rears and 111 for front. Suggestions?
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02-26-2012, 11:09 PM
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#11
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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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?
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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02-26-2012, 11:16 PM
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#12
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Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 87
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I'll have to report back with that information.
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02-29-2012, 01:02 PM
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#13
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Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 87
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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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02-29-2012, 01:16 PM
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#14
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Senior Member
National RV Owners Club Workhorse Chassis Owner Ford Super Duty Owner Carolina Campers
Join Date: Aug 2011
Posts: 2,266
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Quote:
Originally Posted by Mr_D
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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So, I know it's not optimal, but is it SAFE to run those pressures as long as you don't exceed maximum weight?
__________________
2002 National Dolphin LX 6356
Workhorse W-22 chassis
Don't believe everything you think.
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