Technical Replacing diff seals on ducato 250 2.3 jtd, wheelhubnut torque?

[Bison be]

Hi all,

I´m about to change the diff seals on my 2014 ducator 250.
It´s the second time actually. I did something wrong the first time and now they´re still leaking.
First time i only undid the bottom pivot pin on the controlarm and took the driveshaft out without removing it from the wheel hub. That all went ok, and replacing the seal went fine, but i struggled to get the hub back in the lower control arm. Causing the driveshaft to move in and out of the diff several times. I believe this may have damaged the seal or there´s maybe damage on the shaft that i missed cause i didn´t inspect it thouroughly that caused it.
Planning to remove the driveshaft from the hub this time to inspect it more closely and make install easier.
Can anyone tell me what torque is required for the wheelhubnut on the driveshaft after reinstalling, because i can´t find a defiinitive answer. Some say 500Nm, others 450 or even 300Nm. It´s not the maxi version.
Any other tips to make this more easy?
Or a good brand of seal? I used stark brand from autodoc the first time.

Thx

 

[Kahcorp]

This may help.

 

[Bison be]

This may help.

Thx, helps a lot. Good thing i didn't torque it to 500Nm then.

Took out both driveshafts and both have wear at the seals and the bearing on the right one was also starting to get a little play. So ordered 2 new seals and 2 driveshafts. Ordered a different type for the right side as the first type was not easy to get in.
Is it best to add some sealant like loctite flange sealant when installing them or is it better to use a little oil to make them slide in easier?