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Old 04-09-2017, 08:02 AM   #1
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Tag Dump

I have a switch on my dash for Tag Dump. When would I use this and what does it do.
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Old 04-09-2017, 08:32 AM   #2
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I have a switch on my dash for Tag Dump. When would I use this and what does it do.
Howdy Schladetxky, I'm going to offer my understanding of the Tag axle and the reasons you dump the air. However, this is just my understanding and I am deferring to those who actually have/use the motorhome with a tag axle who may offer a better and more detailed explanation later.

The Tag axle is the non-powered axle behind your actual drive axle. Many times this axle will only have single tires, where your drive axle will have duals. It's placed there to allow your MH to carry more weight, where your drive axle may have say a 20,000 lb axle, the tag axle may have like 10,000 and that gives your MH 30,000 pounds capability in the rear, as well as an extra set of brakes on that axle for stopping. These are just random numbers I'm putting, and your MH may be different.

By having two axles in the rear, this changes your pivot point too on the rear. When you are making real tight turns, either going forward slowly, or backing up....by dumping the air on the tag axle (which dumps the air out of an air bag which was forcing the tag axle down), then the tag axle will raise up and thus changing the pivot point to the drive axle only.

This allows for tighter turns when going slowly forward or backing into a spot.

As stated, this is just my understanding, and hopefully those with these rigs will better explain it.
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Old 04-09-2017, 09:11 AM   #3
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Howdy Schladetxky, I'm going to offer my understanding of the Tag axle and the reasons you dump the air. However, this is just my understanding and I am deferring to those who actually have/use the motorhome with a tag axle who may offer a better and more detailed explanation later.

The Tag axle is the non-powered axle behind your actual drive axle. Many times this axle will only have single tires, where your drive axle will have duals. It's placed there to allow your MH to carry more weight, where your drive axle may have say a 20,000 lb axle, the tag axle may have like 10,000 and that gives your MH 30,000 pounds capability in the rear, as well as an extra set of brakes on that axle for stopping. These are just random numbers I'm putting, and your MH may be different.

By having two axles in the rear, this changes your pivot point too on the rear. When you are making real tight turns, either going forward slowly, or backing up....by dumping the air on the tag axle (which dumps the air out of an air bag which was forcing the tag axle down), then the tag axle will raise up and thus changing the pivot point to the drive axle only.

This allows for tighter turns when going slowly forward or backing into a spot.

As stated, this is just my understanding, and hopefully those with these rigs will better explain it.


Thanks. Very well stated.
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Old 04-09-2017, 11:21 AM   #4
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Very well stated. The Charleston automatically dumps the tag when you put the trans in reverse, if going forward you have to dump it manually. It will automatically re-inflate when going about 7 mph.
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Old 04-09-2017, 12:01 PM   #5
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Perfect. Thanks Billr
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Old 04-12-2017, 10:02 PM   #6
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Does anybody have a number for Mitch's boss.
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