If I remember rightly you need to jack the front up, take the centre cap off, then the hub centre (5/6 small bolts and a snap ring) then there is a retaining ring held in by 2 small screws. Take that off and then the wheel bearing is adjusted by turning the big centre ring (that is the terrano equivilent of a centre nut) with either the correct tool or gentle us of a centre punch !!!! Try to follow the manual for torque settings then put it all back together again :clap:clap..... I am sure someone far better than I will point you to the right place in the manual or on this site.... Also depends on fixed or locking hubs, nines fixed so cannot comment on the other sort