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Old 06-15-2012, 03:49 PM   #1
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Tag Axle

Had a problem a while ago. blew out a tire on the tag axle of my Monaco Signature. No reason that i can determine, had just stopped at a flying j and filled with fuel. tires seemed ok as i always do a check whenever i stop. went approximately 30- 40 miles and it came unglued, i mean exploded. luckily no major damage but still can' figure out why. friend of mine commented that maybe the air pressure to the tag bags was too high, anybody out there have a comment on what air pressure should be run on the tag axle air bags?
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Tracy Buck
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Old 06-15-2012, 04:19 PM   #2
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That varies from manufacture, to model to how you loaded it.
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Old 06-15-2012, 04:38 PM   #3
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Just curious, what is the age of the tire?
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Old 06-15-2012, 06:55 PM   #4
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Quote:
Originally Posted by 336muffin View Post
Just curious, what is the age of the tire?

yes...and what was the TP?
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Old 06-15-2012, 06:58 PM   #5
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Tag Axle Air Bag Pressure

I may be able to help you with tag air bag pressure.

Your coach is a 10 air bag roadmaster chassis, the same as mine which is a Beaver 10 air bag roadmaster. Same chassis from Monaco.

My manual states normal tag pressure at 37 psi.

Be careful with tag air pressure it changes the weight carried on the front axle. Too much pressure can overload the front axle. You should weight each axle when changing tag air pressure.

Too little pressure and your coach will tend to porpoise on road dips and bridge overpasses.

When you change the pressure, you must recycle the air bag pressure sensor by raising and then lowering your tag axle. Otherwise what you see on the pressure gauge may not be the same in the air bag.
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Old 06-15-2012, 08:09 PM   #6
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I would think that your tire monitor system (You do have one on a rig like this?),or would have given you a combo of higher PSI and Temps, if that Tag had more pressure then the balance of the combo of dual's and the other tag.

If no warning beep, or observed PSI reading was high - then I would look for other problems.

Tag's, being the tail end of the train, get more abuse from tapping curbs and other fixed items, and too often the scrubbing effect being on the tail when not raised...

Those are things to consider.

Oh - And sorry to hear this took place... But, so glad you are able to post about it, as tire blow outs can reduce the ability type - permanently... IMO, it is one of the most severe problems of the average car/truck/RV - people just don't know or care....

Best to all, be safe, have fun,
Smitty
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Old 06-15-2012, 11:17 PM   #7
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As a fairly close comparison, I run about 85 psi in my tags. I am 42' dynasty. I run my tag axle pressure at 38. I also weighed each axle and each wheel to determine my tire air pressures. I run 85 tag, 80 drive axle, and 115 steer axle.
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Old 06-16-2012, 12:13 AM   #8
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Tracy, get ready as the others may go also. My last two Monaco coaches have come with Goodyear G670 22.5" tires and we have had problems on both. This last set started blowing out at the three year point. They appear good when inspected, but the steel belts separate and the tire explodes at speed. They usually cause damage to other components when the steel belts shred from the carcass and rotate.
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Old 06-16-2012, 05:14 AM   #9
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Thanks, good info all around, signature is a model year 2000, tires were replaced in 2006 with Michelin, tire air pressure is 100 psi
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Old 06-16-2012, 08:57 AM   #10
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Tracy, I have a 2004 44' Signature. The rear bags come with 28 psi in the regulator from the factory and that is also what the manual stated. I put the rig on truck scales and measured the weights on the tag, drive and steer axles independtly and found that I had way too much weight on my drive axle at 28 psi. I started upping the tag bag pressure 5 psi at a time lifting the tag up and putting it back down each time before I re-weighed it again. I ended up with 40 psi in the tag bags before I was happy with the total weight on all axles. Once at 40 psi I dumped all the suspension air and then let it fill back up to Drive levels and checked again. All was good. There is absolutely no reason to run 100 psi in the tag tires. I run 85 psi and according to the scales and charts that is still too much but there is a minimum pressure required on tires. I would highly recommend putting your fully loaded and fueled rig on a truck scales and weigh it. Then adjust it. Normally the first weigh is $10 then each weigh after that is $2-3 each. I stayed on the scales for a long time and it was no problem. If you have any questions then email me direct at mike.c@mindspring.com

When making tight turns at low speeds are you lifting your tag axle or dragging your tires sideways?
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Old 06-16-2012, 10:53 AM   #11
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Tracy, bad info on my part. I run 80 in my tag and 85 in my drive. (opposite of what I posted). Based on what Mike said about minimum, I am going to adjust tag to 85. Next trip out I am going to weigh again and see where I am with the axle weights and adjust pressure on tag if necessary. Too much pressure on the tag can overload the front axle if you don't watch it closely.
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Old 06-16-2012, 04:56 PM   #12
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Barlow46, I am totally surprised that you run those low of tire pressures in that heavy Dynasty. You are close to the same weight as my Sig. I have to run 85 in the tags, 100 on the drive and 115 on the steers. Since I put the 315's on the steers I have dropped it to 105.

Also, just for infoo, I found that by adjusting the tag bag air pressure it did make a small difference to the steer axle weight but not as much as I thought it would. It sure took a big load off my drive axle.
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Old 06-16-2012, 06:19 PM   #13
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I had my coach weighed at a Rally using 6 scales. I did this with the understanding that I wanted to stay on the scales long enough to adjust the tag axle. We found that a 4 pound difference in the tag changed the front axle 500 pounds. After that weigh I run 110 front 85 drive 80 tag.

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Old 06-17-2012, 08:29 PM   #14
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Quote:
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Barlow46, I am totally surprised that you run those low of tire pressures in that heavy Dynasty. You are close to the same weight as my Sig. I have to run 85 in the tags, 100 on the drive and 115 on the steers. Since I put the 315's on the steers I have dropped it to 105.

Also, just for infoo, I found that by adjusting the tag bag air pressure it did make a small difference to the steer axle weight but not as much as I thought it would. It sure took a big load off my drive axle.
Mike,
Don't have my exact weights here at home and I could be mistaken but here is what I think. My gross drive axle weight is 20,000 and my gross tag is 10,000lbs. Here is a copy from the Michelin site on load inflation tables. (had trouble lining up the numbers but put the 85psi for duals in bold. If I am reading that correctly, 85 psi in duals should handle up to 21,000 gross. Next time I am down at storage, I will pull my exact weights and look at it again.
95/80R22.5 LRH XZA2® Energy™
PSI 75 80 85 90 95 100 105 110 115

Single 5375 5660 5940 6220 6495 6770 7040 7300
Dual9530 10030 10530 11030 11510 12000 12470 12950
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