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Old 06-17-2016, 07:45 AM   #1
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1963 22' Safari
Vail , Arizona
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Axle alignment

I have measured the distances from the hitch nose of the trailer to the axle hubs and find they are different by 5/16 of an inch. What difference is tolerable?

Thanks in advance for any advice you can offer....

Owen as morganobenn

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Old 06-17-2016, 07:52 AM   #2
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I would want want way less, like 1/16 " ,with the curb side leading, not hard to do...

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Old 06-17-2016, 09:20 AM   #3
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1960 33' Custom
Saskatoon , Saskatchewan
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It might not make any difference but I use a ball in the coupler and measure to the centre mark on the ball shank rather than the exterior of the coupler
1960 Sovereign 33' Pacific Railroad Custom
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Old 06-17-2016, 09:50 AM   #4
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I think the "official" specification is 1/4". I would try for 1/8". 0" would be perfect but I'm not sure you can measure with that kind of precision.
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Old 06-17-2016, 12:02 PM   #5
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A shop I just left said 1/16". My front axle was out 1/4" and wearing the tire. Once I backed on to the rack it took them just under an hour and $150 to fix. I highly recommend Myers Alignment in Ontario, OR.
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Old 06-17-2016, 12:19 PM   #6
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The specification of 1/16" is for hub to hub distance between two or more axles. I agree that 1/16" from axle hub to hitch ball center would be great; I'm just not sure that is acheiveable in most cases.

The other issue is that the hitch ball socket may not be exactly on the trailer centerline.

The best way to check the axle alignment is to make sure the axles are perpendicular to the centerline. The allowable amount the axles can be off of perpendicular is 1/2.

But that is exceeding difficult to measure on a built trailer.

If you do the trig, 1/2 off is about 3/8 inch at the hub end.. In my opinion that is too much. But that's how much the axle on my Tradewind was off before it was adjusted.

I think 1/16" would be the best you could achieve without lazer interferometry.

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