Jump to content

new Volvo trucks with "dead" #3 axle


sclord2002

Recommended Posts

I just saw several new Volvo 780's at my local dealer that had tandem axles but the #3 axle was a dead or tag axle [no pumpkin]. I guess you can spec them any way you want them but these were the first I had seen that were set up this way. It would certainly simplify singling short since the only drive axle is already in the #2 axle position and no driveline changes would be required. Have I just not been paying attention or is this a new trend in tandems ??? Charlie

Link to comment
Share on other sites

When I was a boy, me 'n my pet dinosaur would sit by the road and watch the trucks to see which were "live" tandems, or had a dead axle.

 

Seriously as late as the middle seventies, lots of OTR trucks had a dead axle, and only trucks intended to go off road had both drive. A pretty large fleet owner near here still orders his new trucks that way. Less weight. fuel, tire wear, etc.

Link to comment
Share on other sites

Guest Lostinaz

You can dump the air in the tag axle.

Trucks like that get stuck easier in mud and snow.

Ruan ran trucks like that into the mines around here and they would have trouble in the mud.

Link to comment
Share on other sites

Consolidated Freightways before their demise ran tag axles on the majority of their road trucks. Keep in mind a little history, consolidated Freightways started Frieghtways Motors which is now Freightliner Corporation. CF ways very innovative in their Maintainance thinking. They also started Pines Trailers to build their own trailers.

 

With that said I would not run one in our application. I'd either go single or dual powered axles. IMO

Link to comment
Share on other sites

I remember seeing a belt run between the duals from the driver to the tag so the tag actually became a driver without the differential.

Perhaps what you saw was a belt to clean out mud and debris so as the truck went back on the road he didn't sling mud everywhere. It's even been tried with chain.

 

Not saying it's a good idea, but some folks will try anything.

Link to comment
Share on other sites

Perhaps what you saw was a belt to clean out mud and debris so as the truck went back on the road he didn't sling mud everywhere. It's even been tried with chain.

 

Not saying it's a good idea, but some folks will try anything.

 

No, it is a drive belt. They do exist and one local farmer has one. There is a name for it, but I do not recall it just now.

Link to comment
Share on other sites

Found it. Scroll down to page 2.

 

http://www.aawheel.com/siteresources/data/files/sdap.pdf

 

Yep, that's it. Odd thing IMO. From what I'm told it does work, but only mildly. High hp trucks over power them pretty easy. But "back in the day".....they were put under a few gas powered trucks that ran in fields or up in the logging roads etc. Eventually tandem drive won out when lockers were made more robust and operator controlled.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Guest
This topic is now closed to further replies.
RVers Online University

campgroundviews.com

Our program provides accurate individual wheel weights for your RV, toad, and tow vehicle, and will help you trim the pounds if you need to.

Dish For My RV.

RV Cable Grip

RV Cable Grip

All the water you need...No matter where you go

Country Thunder Iowa

Nomad Internet

Rv Share

RV Air.

Find out more or sign up for Escapees RV'ers Bootcamp.

Advertise your product or service here.

The Rvers- Now Streaming

RVTravel.com Logo



×
×
  • Create New...