Pulley problem - RCK54-23BX

[axbxnx]

My deck was making a lot of noise so I had a look - what could have happened to the bolts? Do I just replace them or must anything else be done

 

[85Hokie]

I have never seen that on a Kubota deck - and that seems to be a fairly new deck too ( xx80 series)

I would think those bolts or lack of would have made some noise earlier while mowing.

I am not sure replacing bolts is the answer just yet - you might have a bearing shot too! I would remove the belt and start removing those pulleys and see what else is damaged.