Assuming that the upper Railko bush and lower bearing or bearings top and bottom, depending on the age of the vehicle, aren't excessively worn, it is possible to adjust the swivel preload by changing the number of shims, if they've had it you'll need to replace them first. The required preload is measured using a spring balance on the track rod end balljoint hole. The preload (3.6 to 4.5 kg) is quoted with the large swivel pin oil seal not attached to the swivel housing.
It would be worthwhile having a read of the relevent part of the Haynes (or genuine) wokshop manual.
Regards
Wolfie