Hub temperature - Fiberglass RV



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Old 04-16-2019, 05:41 PM   #1
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Name: Dave
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Hub temperature

I recently finished installing electric brakes on my 2010 Scamp 13 deluxe. The parts were from etrailer and included new hubs, brakes, bearings and seals. I followed all installation instructions as directed, as far as I know, including working grease into the bearings, adjusting nuts on the axle and adjusting brakes, etc.

Just finished a trip to Charleston, SC, about 280 miles each way. On the return trip it was about 60 degrees F when I left. Drove about 150 miles at 63 mph before stopping. Temp was about 70 and hubs were just warm to touch. Drove home at same speed where temp was about 75 degrees and hubs were too hot to hold on to.

Any thoughts regarding the cause and solution are welcome. Thanks!
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Old 04-16-2019, 05:45 PM   #2
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Name: JD
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First jack up the wheels and check each to see if you have a brake dragging.
This will cause the hubs to get hot.
Also if the bearings have been over packed this will make the hubs run hot if the brakes are not dragging.
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Old 04-16-2019, 05:52 PM   #3
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Dave,

If you mean just the hub portion outside the wheel, that could be overheated bearings, possibly because the retaining nuts are too tight.

I would also touch the brake drums. If the brake drums are even hotter, then the problem is likely that the shoes are dragging and need to be adjusted (loosened).

John

[I had the right brake overheating, and it turned out that it was because the left brake magnet was not engaging the brake. The left brake magnet was hanging loose because the retaining clip had come loose.]
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Old 04-16-2019, 07:14 PM   #4
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Spend $20 at Harbor Freight and get an infrared temperature gage. Then you can have real data. I bought their little more expensive version with a lazer aim. Cost $28. Should be any campers tool box.
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Old 04-16-2019, 09:03 PM   #5
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Name: Mac
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If it's not dragging brakes, you may have your axle nut on too tight.
this is the general idea; dexter specifies using 50# of torque. The idea is to take all the slack out of the bearing assembly, then back off the pressure used to take the slack out, then just barely tighten after feeling resistance. If a cotter pin or retainer won't fit, err toward loosening the nut in order to make it fit.
https://www.championtrailers.com/pre...heel-bearings/
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Old 04-16-2019, 11:10 PM   #6
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Quote:
Originally Posted by thrifty bill View Post
Spend $20 at Harbor Freight and get an infrared temperature gage. Then you can have real data. I bought their little more expensive version with a lazer aim. Cost $28. Should be any campers tool box.



WARNING Cheap IR thermometers can be very inaccurate in ambient temperatures away from 72F.



I spent the last years of my career designing IR thermometers that will work in an environment between -40 to 130 F. It was far more difficult than would have gone into a Harbor Frieght IR thermometer. In order make it with 1C through out the -40 to +130F we were taking about 62,000 pieces of data every 3 days then analyzing the data.
It has been estimated that from time we start the project to having a product that those requirements we spent close to $4 million.
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