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Old 06-19-2011, 09:04 PM   #1
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TT Wheel Bearing Temps

When arriving home from a 120 mile highway run at 55 mph, I decided to check the temperature of the wheel bearing hubs. I used the low tech method of touching them with my fingers. Done this before many times with the boat trailer - single axle. What I found has me confused. The rear axle, both sides, was quite warm, but still could hold onto it without hurting the hand. Fairly normal I thought. The front axle both sides was by comparison, barely warm at all. By looking at the suspension springs, the two axles are equally loaded, and all 4 tires are right at 50 lbs of inflation. Not sure why the difference between the front and rear axles. Any thoughts?
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Old 06-19-2011, 09:31 PM   #2
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Better air circulation up-front? Brake adjustment difference?

Just guessing.

Bob
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Old 06-19-2011, 09:42 PM   #3
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Interesting.....would be curious if the entire axle bar was the same temp. My first thought was that if you had a hot hub it was transferring across the entire axle, but that really seems like it would be unlikely and one side would be hotter....
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Old 06-19-2011, 10:18 PM   #4
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Any chance the trailer could be high on the hitch? That would put more wieght on the rear axle and less on the front. Park it in a level place and see if your trailer is truely level.
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Old 06-20-2011, 05:28 AM   #5
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Quote:
Originally Posted by clutch View Post
Any chance the trailer could be high on the hitch? That would put more wieght on the rear axle and less on the front. Park it in a level place and see if your trailer is truely level.
I like that possibility better than my air-circulation theory , but then again a nose high TT will catch more wind underneath..........hmmmmm

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Old 06-20-2011, 06:09 AM   #6
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Interesting, maybe front axle brakes are not braking as much as the rear axle, could be wiring?? at any rate a inspection is in order, repack the bearings too.
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Old 06-20-2011, 07:27 AM   #7
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Quote:
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Any chance the trailer could be high on the hitch? That would put more weight on the rear axle and less on the front. Park it in a level place and see if your trailer is truly level.
that would be my first thought... if the trailer is angled up it puts more weight on the rear axle.
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Old 06-21-2011, 05:46 PM   #8
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This TT has the Dexter EZ-Lube axles. I removed the rubber dust cap, and the grease looks clean, and sufficient quantity. We are going about 30 miles this weekend to a local CG, and that will give me a chance to measure the TT on level ground, to see if it sits level. If it's not level, I suspect it's within a inch or so, front to back. Next thing to check would be brake adjustment. They are not the self adjusters. Could be too, that I'm being too picky about this, and there really is no issue.
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Old 06-21-2011, 08:09 PM   #9
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I check my tire and hub temps regularly with a laser thermometer when we stop for fuel or rest areas. On my rig "normal" temps for tires are 15-20 deg. above the ambient temp. Hubs run a little less.
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Old 06-21-2011, 08:54 PM   #10
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Quote:
Originally Posted by norty1 View Post
I check my tire and hub temps regularly with a laser thermometer when we stop for fuel or rest areas. On my rig "normal" temps for tires are 15-20 deg. above the ambient temp. Hubs run a little less.
Question for you norty1,
when you measure the hub temperature, are all 4 hubs about the same temp?
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