Tag axle shook the truck violently.

You said shook and I'm sorry but I couldn't help ...
I hope it gets worked out. Meanwhile have a laugh...

 

I was a driver for Puget Sound once. My truck did that very thing. It never happened after shop replaced the tag axle stabilizers...

 

Sorry to threadjack(?), but I don't see anything funny about this video. Nobody has any kind of lifejacket on and the girls in the bikini's definitely hit their heads on the side of the boat. And they wonder why people get hurt and drown on boats. I think it's incredibly irresponsible.

 

You really need to be careful and have it checked out. I had to dig around and find some pics from a unit with a sporatic issue. Turned out the vibration did more damage than the driver had thought. We had a complete wheel end almost come off on I-5 in Seattle.

Have seen 3 of these fail in the last few years.

 

Old thread I know but man I had this happen years ago....on new FL70.....freaked me out a little. Within a split second I suspected the air pressure was wrong (always had to guess what pressure I should be at!) so I reached down and hit the lever to pull it up and barley stopped in time for a intersection.....

Now the last tagged truck I drove....the mechanic said, "leave the pressure where I set never change it!".

 

threw me off with you calling it a tag axle. actually a pusher axle steerable. had one on a heavyhaul truck one time stabilizer shock broke going down the road at 60 mph grossing 145000lbs. did some CRAZY drivin before I got stopped. went straight home and replaced with a straight axle after that!

 

Same thing happened to me 80psi on tag axle, loaded with 17tons of dirt cruising at 60mph hit a rough patch on I-5 and the truck started shaking VERY violently, I suspected it was the tag axle since this only happened to me when loaded and tag axle down, I purposely went through a rough road at 45mph tag axle down fully loaded and sure enough the truck started to shake violently until I hit the brakes and slowed down to about 35mph, after that I tried doing that again fully loaded briefly raised the tag up on the rough area cruising at 55mph and nothing happened, I lowered the pressure to 60psi and tried again and it did it once again however this time it didn’t do it as harsh I just pressed the brakes and it went away without getting to the violent shake of death so I think it’s all about how you set the pressure on your drop/tag axle

 

Since mine also steers I guess it is a steerable push axle… the point is that it shook like hell, and it scared the lights out of me and everyone around me on the highway, I’m a very mechanically inclined individual so after seeing the design of the “drop axle” on my truck, I believe that if the axle has 2 air bags (springs) exerting force down on the ground they should also have some form of shock absorbers/dampers that prevent them from bouncing like an over inflated basketball but I don’t see that anywhere… and I don’t think the struts that prevent them going side to side will be able to prevent the up and down bouncing problem