04-02-2020, 10:22 AM
I suspect most RN/RP steering boxes are filled with grease because of their propensity to leak (from the seal and the lowest stud) and because they have a grease nipple, certainly every one I've stripped has been full of grease. However, when I rebuilt ours I realised that grease wouldn't flow into the the worm bottom thrust face or through the holes to lubricate the worm wheel shaft. So the rebuild included fitting new worm wheel shaft seals and once the adjustment was finalised the slot round the bottom cover stud hole was filled with multigasket. It was then filled with Castrol D140 since when I can get hold of the front wheels and move them lock to lock all day long if I wanted to whereas previously i couldn't. I fill the box up to the grease nipple hole.