Hi TTTPHD,
I don' t know. A plan of the Tandem which was included in the files of the former owner says, that it is a "RV-84" Hendrickson Tandem.
But I went to an old tire specialist in Saxony today. He finally had the necessary equipment and took care of my vibration problem. He jacked up the Revcon and spinned the wheels with his balancing machine, while we were watching them closely.
And here is what we have found out:
The heavy vibrations come from the second wheel on the Hendrickson Tandem - passenger side. The wheel bearing has a lot of play there. It was pretty scary, watching the wheel wobbling around the center. The Transforce tire is already damaged and has got an oval outline.
The vibrations are also transfered to the first wheel on the Hendrickson Tandem, which also shows a light bearing damage. You can also hear a silent, grinding sound when slowly turning the first wheel.
The vibrations have already started to show up at lower speed. First - when I bought the coach 2 years ago - they were noticeable at 58 mph, now after 2200 miles at 55, so the damage is getting worse.
The rear wheel bearings have never been exchanged during the last 93.000 miles.
The former owner was focused on the FWD only - there, he replaced almost everything - and was not able to solve the problem in 20 years!
I have no idea where I can order the correct rear wheel bearings yet...but I finally - after 2 years of dealing with the issue - have got an reasonable explaination for the source of my problem!
The tire specialist in Saxony is also able to balance the wheels on the Revcon, as advised in the original manual.
Maybe an imbalance of the big brake drum is responsible for the heavy damaged wheel bearings - or only the bearings went bad.
However, let' s get 4 new rear wheel bearings, which fit and a new tire, of course. After that I will take care of the correct balancing.
This will take some time.
Thanks. Matt
_________________ 1979 Revcon Camelot 30ft. 403 L80 Oldsmobile Toronado FWD UPP
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