Rck54 15bx main shaft is loose after reassembling

[heatherm]

I reassembled my rck54 15bx gearbox, but the center shaft has movement. Is this normal or could something else be wrong?

I replaced all the bearings. Reassembled everything and added oil. It was leaking from the oil seal. I have a new seal on order, but trying to see if I need to fix something.

Help, please.