CAT 444F Backhoe/loader equal size tyres rear final drive oil seal leaks

I have a CAT 444F which is leaking oil from the final drive steering hub, I assume it is leaking from the final drive hub compartment with the planetary gears inside. has anyone carried out this repair? Are there any special torque settings for the bolts or any pre load settings. Any info would be greatly appreciated. Machine year 2013 Serial number CAT0444FCFBN00176. Thanks, Willis