axle nut torque

[dermot]

I am about to replace the bearings on the Bramber trailer for my BR20, which has AL-KO 750kg unbraked "waterproof" bearings:
http://www.merseatrailers.com/product_details.php?product=Alko-750kg-Unbraked-bearing-kit-waterproof&top=Spares-and-Components&sub=Hubs-and-Bearings&category=33&show_menu=9&prod_code=BEARING-ALKO-750UB-WP

However I'm struggling to find any definitive spec for the torque to tighten the one-shot nut that holds the bearings on to the axle. Does anyone have any experience / advice on this?

Thanks
Dermot

[Peter Cockerton]

Dermot

Not sure if this relevant to your Alko axle and hub but the following site discusses Alko caravan sealed hubs

https://www.practicalcaravan.com/forum/technical/28339-al-ko-hub-nuts

One post talks about the torque required on the “one shot nut”

The torque for the Al-Ko hub nut is 290NM, for the BPW hub nut it is 280NM, both figures + or - 10%

Hope this helps

Peter C

[Graham W]

That’s a big number! The next task will be to find a torque wrench that goes that high.

[dermot]

Thanks Peter

I had seen such postings but I believe the 290Nm torque is for heavier duty caravan bearings which are sealed and non-tapered. I have asked Mersea trailers for advice, will post back if I hear.

In the meantime I've dismantled the hubs, and the old "one-shot" nuts that came off had been crimped onto a slot at the end of the axle. It also didn't feel like 290Nm of torque to get it off, in fact it was probably less than a normal wheel nut. I found another source which said to torque to 50Nm and then back off 30degrees and lock with a "special tool" but no reference to what that might be. It may end up being a nail punch and hammer...

Dermot