Bearings should be checked approx 100-150klms after installation. Tighten axle nut until tight and then back off until you are able to insert the split pin. Double check the split pin. A missing split pin will often cause your wheel to come off the vehicle.
During long trips, it is a great idea to place your hand on all hubs when filling up for fuel. If you feel excessive heat then your hubs and/or need attention.
TIP: Check u bolt tension when you check your bearings.