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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 12-21-2019
pauleburgess pauleburgess is offline
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Default What is this Wheel/axle accessory?

A local coach service bus passed by me, a Volvo bus. Outside of each wheel, steer, drive, tag, was a chrome cap with a bar that ran up into the body work. What are they and what is their purpose? Picture attached.
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  #2  
Old 12-21-2019
pauleburgess pauleburgess is offline
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I am guessing an automatic tire inflation system. Seems to expose a lot more places to lose air.
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Old 12-21-2019
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curtsprenger curtsprenger is offline
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Quote:
Originally Posted by pauleburgess View Post
A local coach service bus passed by me, a Volvo bus. Outside of each wheel, steer, drive, tag, was a chrome cap with a bar that ran up into the body work. What are they and what is their purpose? Picture attached.

Automatic tire pressure control.
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Old 12-21-2019
Bruce Bruce is offline
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Almost every Mexican bus has that system. I think it is European.
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  #5  
Old 12-22-2019
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Years ago, before we got our bird, we had a 26 foot GMC and went to a FMCA rally in Oregon.
The president of the FMCA was there, in front row, with his Prevost.
He had this setup on his wheels.
I asked him about it and said it was a south of the border system that did keep the air up in his tires.
If I remember, at that time, he said that it cost over 2k then!
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  #6  
Old 12-22-2019
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Default Tire pressure control with rotary seal

Back in 1970 after returning from two tours of duty with the U S Navy Seabee Mobile Construction Five (MCB5) in Vietnam, I returned to my former job at the Topographic Division of the U S Geological Survey (USGS) and was trained to operate the "Ground Elevation Meter" built by the Sperry-Sun Well Surveying in Sugarland Texas. The unit had controlled air pressure on the tires and also had 4-wheel steering. I operated this 1961 GMC Ground Elevation for over 80 thousand miles during the early 70's until I was reassigned to the office compiling topo maps using ER-55, Kelsh and PG2 plotting instruments.

Here is a link which tells about the Ground Elevation and pictures too.

https://www.xnatmap.org/adnm/docs/recolls/recolgem.htm
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Old 12-22-2019
Robert Britton Robert Britton is offline
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Really interesting article, thank you Dick!
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Old 12-22-2019
Harold,Cat&Sam Harold,Cat&Sam is online now
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Very interesting
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Old 12-23-2019
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It would have been **** to do 80,000 miles our way (3rd order with tripod levels, Alaska Coast Survey). But even worse would have been to drive GEMs around the coast of Southeast Alaska.

Thanks for a really unusual view of topo mapping, Dick!
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Old 12-23-2019
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Randy Dupree Randy Dupree is offline
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Dick and i have talked about those trucks before,i bet they were a handful to drive at any speed.
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