u need a ford transit bearing removal tool by sealey
or grind the bearing outer casing which splits the case
and then remove it and then gently cut with the grinder the innercase that will loosen the bearing and it will drop off the new bearing will have to be pressed in failing that remove the assembly and take it with the new bearing to your local garage it will take about 1hr to do cost around 30.00 but worth doing because there not fun