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Old 10 May 2012, 16:51   #1
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Trailer bearings too hot ?

I've just taken my trailer for a spin to check all is OK prior to a long journey at the weekend - I stopped after 5 miles to check the temperature of the hub - one was slightly warm but the other whilst not hot was warmer -I could keep my hand on it no problem. Would any problems show up in a 5 mile road test - would it have reached maximum temperature on this 5 mile run ?

Thanks
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Old 10 May 2012, 17:29   #2
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Jack it up and see how much play is in the wheel, if it's a really long journey and you've not checked them for a while then I'd take them out, check and grease.
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Old 10 May 2012, 17:29   #3
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If I understand your post and the trailer is empty, I'd say yes you have a problem .. pull the drums off and fix it, and save your self some heart ache, on your journey... could be just a stiff cable ? , and some lube will free it this time and you'll be ok till next season, but you would do well to check
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Old 10 May 2012, 17:49   #4
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Thanks - boat on trailer - unbraked. I may have overtightened the one shot nuts (previous post) - but only nipped these up quite gently. Bearings in good shape. Wheels spin freely with no play at all. More grease ??
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Old 10 May 2012, 18:18   #5
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There should be a tiny amount of play in the bearings. Do not overtighten or they will fail prematurely.
There should be no free space in the hub at all, pack it full of grease.
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Old 11 May 2012, 02:40   #6
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Quote:
Originally Posted by Skinnyrib View Post
Thanks - boat on trailer - unbraked. I may have overtightened the one shot nuts (previous post) - but only nipped these up quite gently. Bearings in good shape. Wheels spin freely with no play at all. More grease ??
If you have one shot nuts you have sealed for life bearings which you are very unlikely to over tighten as they are quite different from tapered roller!

How have you stripped & checked them?
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Old 11 May 2012, 03:42   #7
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Thanks - if I tighten the hub nut anymore the wheel won't turn ! The bearing is LM11749 - tapered. Took these into Indespension who said they were OK. Re- greased but running warm still...... ?? Setting off early tomorrow morning !!
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Old 11 May 2012, 03:55   #8
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Originally Posted by Nick Hearne View Post
If you have one shot nuts you have sealed for life bearings which you are very unlikely to over tighten as they are quite different from tapered roller!

How have you stripped & checked them?
My understanding of these 'Alko one shot' nuts is that they're not the torque 290Nm variety that usually accompany sealed for life roller bearings, rather as the OP has suggested, they are tapered bearings. They've been tightened to stop any lateral movement and 'one shot' nut applied. The nut goes on, is nipped up, then punched on both sides of the shoulder to engage with the slotted head on the stub axle. Double-check you've put the thrust washer on after the outer taper roller bearing.

Give me a castellated nut and cotter pin combo any day.

Once you've repacked with more grease Skinnyrib - then remember to use a new Alko nut!
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Old 11 May 2012, 03:55   #9
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I think you may have over tightened them I put the castle nut on uptight then back off 1/4 turn.

Trailer Guy did a blow by blow acount on how to change them.

How to change a set of taper roller bearings PART 1

How to change a set of taper roller bearings PART 2

Nick
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Old 11 May 2012, 06:22   #10
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sounds like they may be a bit tight, or lacking in grease. Difficult to tell remotely. Chech your tyre pressures too, if they're low they'll generate heat, due to the additional friction. So heat could be transferring back the other way to the hub, from the tyre, rather than out from the bearings.

one shot nuts and taper roller bearings is an unusual combination. Get them on a lot of yanky trailers, but not many uk ones.

As nick said, this may assist:

How to change a set of taper roller bearings PART 1

How to change a set of taper roller bearings PART 2
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