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Old 01-08-2020, 03:24 PM
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milomilo milomilo is offline
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Just noticed when hauling the son's shed materials back from Cheyenne yesterday that my 16' flat bed trailer was dogtracking instead of following directly behind the truck. Looks to be about 2" off to the drivers side. Not something you check for often so not sure how long it has been that way.

Put new tires on it about a year ago and watched how ir tracked then and it look straight. Replaced the bushings on the springs 2 years ago so not likely that is the problem. Trailer has not been in an accident since I bought it mew 15 years ago. Noticed that the trailer was about 1 1/2" high at the hitch since the new tires so plan to find a 1" drop hitch insert to get it back level. That may fix it, but does not seem likely to me.

Anyone got an idea an the dogtracking problem?
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Old 01-08-2020, 03:36 PM
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Make sure you haven't got a broken spring center bolt. That can let an axle shift.
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Old 01-08-2020, 04:40 PM
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Quote:
Originally Posted by Whitetrash View Post
Make sure you haven't got a broken spring center bolt. That can let an axle shift.
Transferred the axle centers to the top pf the bed and measured each side of the front axle to the front of the trailer and got 1 1/4" difference so looks like I found the problem. Next to flip the trailer upside down, take off the wheels, and set stands on jack stands and check for spring center bolt to center of spring eyes and to center of hitch ball to spindle. Also will check axle straightness too.

I really needed this problem right now.
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Old 01-08-2020, 05:16 PM
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With all you have done, can we assume you checked tire pressure?
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Old 01-08-2020, 05:31 PM
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Originally Posted by kbs2244 View Post
With all you have done, can we assume you checked tire pressure?
Yup. Also adjusted bearings even though they only took a 1/6th turn on 3 spindles.
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Old 01-10-2020, 11:16 PM
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Lifted up the trailer with the Massey tractor and found a missing bolt attaching the equalizer to the frame on the drivers side . Thought then that that this was the problem causing the dog tracking. Replaced the bolt and test drove and still the same doglegging 2" to the drivers side. Springs center bolts are all good.

So now back to flipping the trailer upside down and doing further checks and measurements.
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Old 01-11-2020, 10:44 AM
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Is it possible that this has been like that for a while and you just noticed it?
Measurements will tell the story
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Old 01-11-2020, 12:55 PM
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Originally Posted by Ironman View Post
Is it possible that this has been like that for a while and you just noticed it?
Measurements will tell the story
Expect you are right about how long it has been that way. Too much wind today to work on it. Do not see any inside or outside tear wear so not too excessive. Still am going to do some measurements.

If the axle is not perpendicular to the hitch will likely weld on new attach points for the springs. Just don't know yet. Now it just irks me to see it not aligned. I do remember checking it when I bought it 14 years ago and it was straight tracking then. Never noticed any misalignment all these years until 2 weeks ago.

Still may be the wheels is the issue. There is a difference in the offset in two wheels. Always made sure they were on the same axle. The new tires I added 2 years ago were mounted one each on two different offsets. Noticed it when I mounted the tires but never gave it much thought until now. Going to change the wheels so they match on each axle first and keep the two new tires on the same axle too.

The tires are all the same size but different brands and measure the same on tire height. Hoping it is that simple
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Old 01-23-2020, 02:17 PM
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Flipped the trailer today and measured. The deck is square corner to corner. Hitch is square to the bed. Spring mounts are 3/4" off from one side to the other. Spring mounts are welded to the cross members and to the bed frame on 4 sides. so screwing up the location of the cross members was the cause of the problem. Since I but this trailer new 14 years ago, it has been this way since new. Clearly, it has dog tracked all this time and I never noticed until now. Tire wear has been even on all tires.

Bottom line is I would have to remove 4 cross members and have to install new spring mounts and cross members, as I do not think they would be reusable after the cutting is finished. So the only logical answer is to flip back right side up and run till I die!!!!
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Last edited by milomilo; 01-23-2020 at 02:29 PM.
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  #10  
Old 01-23-2020, 03:11 PM
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Default Flat Bed Trailer

Sometimes it is better to leave well enough alone.

Just keep speed under 100 from now on. Lol

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