Originally Posted by 87MH
Bummer - the tags are really no more than torsion trailer axles with the proper mount for the AS MoHo frame - Henschen might be the quickest replacement since they should have the original blueprints. Inland RV handles the Henschen line.
Just wondering - were you towing anything when you hit the curb, or have you or the PO towed anything prior to the failure?
I would appreciate if you could post the type of failure so the rest of us who own a tag axle equipped unit could make an inspection.
Did the bolts, welds, flanges, or main frame fail?
Pictures detailing the failed area would really help with the post failure debriefing.
Thanks and good luck.
Hitting a curb, depending on how hard, can shear the spindle on a tag axle, just as easy as on a trailer.
The two major reasons tag axles replacements are needed, is surprisingly unnecessary.
First of all, the tag axle never wears out, but just like the torsion axles on a trailer, they can go bad by not being used. The motorhome must be reasonably used.
Secondly, and amazingly so, due to lack of proper maintainence, a bearing will get dry, overheat and seize, destroying the spindle.
Tag axles are just like those on a trailer. The bearings "MUST"
be serviced every 10,000 miles. If not your asking for trouble. That trouble usually results in a axle replacement.Improper adjustment of the air bag valves can put excessive pressure on the tag axle bearings, which can fail from that as well.
Hub and drums are also subject to damage. It is also necessary to properly inspect the electric brakes, which are exactly the same as on a trailer. That must be done, every 10,000 miles as well. Something as simple as an adjuster spring breaking, will cause havoc with the the shoes and magnet, as well as destroying the hub and drum assembly. That trouble results in the need for a hub and drum replacement.
The costs for these components, is much greater for a motorhome than a trailer.
More importantly, tag axles are not something that is stocked in inventory.
Hub and drums, normally, are carried in inventory, in very small quantities.
Traveling with a tag axle equipped motorhome, is great, until you have a problem with the tag axle.
That usually results in being stranded someplace other than home.
Again, most tag axle replacements are not caused by an axle failure within itself. They are all replaced because of accidents and/or improper care.
We have replaced many tag axles on Airstream motorhomes, or provided them to other dealers, but never because one "just" failed on it's own.