Not having done this before I found a company who supply bearings and can press the outer race into the hub so took all the bits there. Not knowing what they would need I put each hub, bearings, washer, nut and split pin in a carrier bag and took it all in to them.
They booked it in for Wednesday and duly pressed the bearings in. I went and collected them and when I tried to fit them I found a washer was missing. I am going back there tomorrow morning to try and get one.
For those who haven't done this yet, first loosen the wheel nuts, jack up and secure with an axle stand and remove the wheel. Ensure the handbrake is off. Knock the cap off. I did it by tapping lightly with a hammer.
Remove the split pin and undo the castellated nut. Pull the hub off.
There are two taper roller bearings, an inner and an outer. The inner is a L44643L and the outer a L44643. The inner has a seal (a black plastic disc). Each bearing fits into a race which is pressed into the hub and although there are many who would press them in themselves I didn't feel confident enough to do it so got someone to do it, cost me £25.
Pack the inner bearing with grease and fit it in the hub, then slide the hub and bearing onto the axle. Grease the outer bearing and slide that onto the axle. Slide the washer on followed by the castellated nut.
The nut is tightened and then a split pin is put through the castellations and axle to secure it in place.
One thing I am unsure of is how much to tighten the nut. I think I should tighten it with a spanner, to make sure everything is pressed well in, then back off until there is no binding (drag) and virtually no play. The hub should spin freely. Then put the pin in. I believe there should be just a little play rather than slight binding which seems to be the choice between the two holes I can put the pin in.
I would appreciate some advice on this.
My feeling is that if I only do it finger tight, the grease etc will not bed in properly and it will be too loose. If I use a spanner, I risk squashing the rollers into the race, but, as the bearing supports 250kg, it must be capable of a bit of tightening with a spanner without causing damage. I'm suggesting about 20 lbft.