Well worth checking. Up on stands, grip wheel at 12 o clock and six o clock to check for any wobble, spin wheel to check for tightness neither should be apparent. Wheel off, calliper off (tie it up out of the way) Remove split pin ( you will need a new one) remove nut and spacer. Pull disc assembly towards you to dislodge front bearing, collect bearing and place on clean rag with nut and spacer. Fully remove disc assembly and gasp at how little grease is there. Note that there is a very thin spacer / washer on the stub axle. Gently wipe all parts with clean rag. Grease rear bearing and re fit to disc assembly being careful to fully seat the seal, grease the cavity and front bearing, again taking care of the front seal. Lightly grease the stub axle and slide the assembly back home being careful of the seals. Re fit spacer and nut. Just nip up the nut at this stage to where the split pin goes in the same direction as before i.e. either horizontal or vertical. Fit the wheel and check for wobble. Non is permitted adjust nut so there is no wobble and split pin lines up.
I hope all that makes sense.