Remove the swivel hub assembly and securely support it on blocks or in a vice. Using a tubular spacer that bears only on the inner end of the hub flange, press the hub flange out of the wheel bearing. If the wheel bearing's outboard inner race remains on the hub, remove it with a bearing puller. Lever out the oil seals and extract the bearing retaining circlip from the inner end of the swivel hub assembly. If necessary, refit the inner race back in position over the ball cage and securely support the inner face of the swivel hub. Using a tubular spacer that bears only on the inner race, press the complete wheel bearing assembly out of the swivel hub. Clean the hub and swivel hub thoroughly, removing all dirt and grease, and polish away any burrs or raised edges that might hinder reassembly. Check both for cracks or signs of wear or damage, renewing them if necessary, and replace the circlip regardless of its condition. During reassembly, apply a light film of oil to the wheel bearing outer race and hub flange shaft to aid installation. Securely support the swivel hub and locate the wheel bearing in the hub, pressing it fully into position with a tubular spacer that bears only on the wheel bearing outer race. Once the wheel bearing is correctly seated, secure it with the new circlip, ensuring it is correctly located in the groove in the swivel hub. Turn the swivel hub assembly over and press the new outer oil seal squarely into position, ensuring it is fully seated and lubricating its sealing lip with a smear of grease. Securely support the outer face of the hub flange and, taking care not to damage the oil seal, locate the swivel hub wheel bearing inner race over the end of the hub flange. Press the wheel bearing onto the hub using a tubular spacer that bears only on the inner race of the wheel bearing until it seats against the hub shoulder. Check that the hub flange rotates freely and wipe off any excess oil or grease. Pack the wheel bearing with grease, then press the new inner oil seal squarely into position before refitting the swivel hub assembly.