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Old 07-14-2013, 04:25 PM   #1
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Unhappy Hub Temps

Hi,

Finished a 200 miles stretch today with our '59 Tradewind. Got out and smelled burning. Shot the hubs and tires with my digital temp gun. got 114 and 116 on the left tire and hub. Then 116 on the right tire and 190 on the hub. Grease cap and hub was very hot to the touch.

Just repacked the bearings before this trip.

Original axle.

Any tips on what to look for when I pop the rim and brake drum off tomorrow?

Thoughts?
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Old 07-14-2013, 04:31 PM   #2
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Maybe you cranked down on the castle nut too much.
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Old 07-14-2013, 04:46 PM   #3
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Did you shoot the drum temps also?
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Old 07-14-2013, 05:52 PM   #4
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Maybe you cranked down on the castle nut too much.
+1 what he said.
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Old 07-14-2013, 07:16 PM   #5
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I'M thinkin' that you you did what the previous posters have said. I'm sure that you have the castle nut too tight. Back off the nut TWO flats and reinstall the cotter pin. You only have to take the cap off to do this. run it down the road about 5 miles and re-check temp. If it is going to be hot it will get there by then.

Now, if it was my trailer, I would disassemble the hub and check the bearings for any signs of "bluing" which would indicate they have been exposed to excessive temps. This will lead to premature bearing failure at the most inopportune time. Better to do it now in a controlled enviroment instead of on the road in the middle of nowhere.

Do not despair, we have all done this at LEAST once.
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Old 07-20-2013, 02:50 PM   #6
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Steveirving,

Any conclusion or findings? FWIW I just checked a container of Valvoline hi temp grease and it listed operating temp to 375F. You also mentioned a burning smell. Brake material has a pretty distinct nasty smell when it overheats.

Gary
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Old 07-21-2013, 07:50 AM   #7
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Steveirving,

Any conclusion or findings? FWIW I just checked a container of Valvoline hi temp grease and it listed operating temp to 375F. You also mentioned a burning smell. Brake material has a pretty distinct nasty smell when it overheats.

Gary
Hi guys, since all your tips i took the hub apart and inspected everything. Plenty of grease still, no bluing or any sign of wear on bearings or races. All looked perfect. Lots of brake dust. Lots. I suspect the shoes were a little too tight. Backed them off and will road temp for temps today.
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Old 07-21-2013, 07:40 PM   #8
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Hi all,

Roadtested the trailer on the highway today for about 5 miles. Pulled over and took temp readings:
Left side: tire: 114, hub: 118, drum: 125
Right side: tire 113, hub: 150, drum 250

I've inspected the right bearings, repacked in grease, and was very careful to tight the castle nut until hand tight, then back one pin hole. I also tightened the brakes, then backed off the pads until the wheel spun free, then 2-3 more turns off.

No evidence of metal bluing of burning on the spindle or bearings or races. No deformities that I can find.

What gives?
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Old 07-21-2013, 08:06 PM   #9
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Is there a groove in the backing plate that the shoes can catch on? It sounds to me like the shoes are not retracting completely. Are the return springs all there and on correctly? Remove drum and grab the magnet and move it in the correct direction the drum would go and see if the shoes move freely and retract correctly.
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Old 07-22-2013, 07:19 AM   #10
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Steve,

Not sure what gives, my brakes are hydraulic. Sounds like shoe drag from an undefined source. Others can advise better on electric brakes, that backing plate suggestion looking for a groove that the shoe can get stuck it, good idea.

But what you have pretty clearly pointed out is the value of a point and shoot thermometor to troubleshooting. I carry one. Its also really helpful at other automotive diagnostics, heating, cooling and you can even shoot your trailer connection plug looking for heat.

Good luck,

Gary
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Old 07-22-2013, 07:53 AM   #11
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Who did the brakes? There are front and rear ones. If they are backwards they drag. Why didn't you replace the axel? Is 59 a leaf spring unit?
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