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Maybe light on front axle.


GlennWest
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I have posted here before about my truck wandering. Have to constantly correct. Well we pulled out today. Fuel at 1/4 tank. Wandering badly. Put $300 in it. 3/4 tank. Night and day difference in driving. Not right but not a handfull. Definitely a big improvement. Never weighed mine but singled on mid position of the tandems. Maintained orginal wheelbase. Pin is 150" from back of cab. My Teton pin is heavy but lots on here is more than mine. The ride height is adjustable on my front axle. Thoughts

Edited by GlennWest
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That is with Smart loaded. Most all of car in front of the axle. I don't have a lot of room for the Smart. I had it built just enough. I did one time leave a little more clearance loaded and got a little paint on my front cap. So it's not overboard at all. I was told today by a retired trucker that raising or lowering front ride height usually corrects this. Had never heard of this before. I hadn't even noticed the ride height adjuster before he showed it to me.

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The actual weights are what is needed to determine what is going on.  What engine do you have?   My Volvo has the pin nearly 9' behind the tandem axle center and even with the Teton it drives fine.  The engine is an ISX so it is heavy.  The front axle is supported by springs and that also makes a difference.  Get the front axle weights with the Teton on and see what you are dealing with.  Anything else is just a guess.

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I had a similar issue with having to work to keep it going straight.  I checked for play in the steering box, that was fine.  Solution, the toe in was way off, like 1/4" + of toe.  After attempting the simple adjustment, I determined why it was not adjusted.  It was rusted solid.   After I could move it, set the toe, now it goes straight down the road.

My pin is back a ways as well but I still have almost 10K on the front all hooked and loaded.

Rich

 

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Glenn,

Here is the formula with mid singling.  You can calculate present weight then unloading.

https://www.engineeringtoolbox.com/levers-d_1304.html

Assuming your front axle is say 180" (15") from rear axle and your pin is 60' (5") behind at a 5000# pin weight you should only be unloading roughly 33% off front axle or roughly 1666#s.  That is with no weight ahead of the fulcrum such as smart, drom, fuel etc.  Again you need weights to get a good picture.

On edit:  Last year DollyTrolly sent me a spreadsheet that will calculate the unloading on the front axle if you have weights.  Maybe he will chime in.

 

Edited by SuiteSuccess
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Glenn, a quick way to estimate under or over inflation is to chalk a line across the tread and then drive it straight. You won't need to go far maybe less than 100 ft, then see if the chalk is worn more on the out side, too soft or in the middle, too hard. You are looking for even where.  If worn only on one side you may have an alignment issue.  Don't forget the rear axle track bar when my truck was still tandem one was very loose and it would wonder. 

Do the chalk thing on the rear as well.

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3 hours ago, SuiteSuccess said:

Glenn,

 

On edit:  Last year DollyTrolly sent me a spreadsheet that will calculate the unloading on the front axle if you have weights.  Maybe he will chime in.

 

Good morning Glenn,

Not much call for weight and balance calculations in the last year since Facebook has taken over much of the HDT chats ......however.......if you would like to try your hand at calculating your weight(s) and balance(s) just PM me your email address and I will dust off a copy of the spreadsheet and guidelines and email them to you.......

 

Drive on.........Try to keep between the ditches.........

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