GHS114 is the hub seal, and 538797 is on the stub axle for the seal to run on. You can pack the bearings, and then put a dollop of grease into the hub between the bearings, but don't completely fill the hub.
The order would be to fit the two bearing tracks into the hub, then place the large inner bearing on to its track, followed by the seal, then place the outer bearing on to its track, and slide the hub assembly on to the stub axle. The outer end has the thick washer with the tag first, followed by the nut and the castellated locking ring, which is held by the split pin once the bearings are adjusted. Then knock the hubcap on, with a smaller dollop of grease inside. Dollops are a universally known Imperial quantity (Don't use Metric dollops)......