2008 bobcat 435 cracking noise when swinging and come to a stop

Hi I'm new to this sight here. but im looking for some info on a bobcat 435 mini excavator its a 2008 with around 3500 hours that i am looking to purchase. Everything seems to run great no power loss or anything like that but the only issue i am seeing with this machine is when you swing around and stop it makes a chattering noise and shutters when it comes to a stop. what could that possibly be? and is it something that should keep me from purchasing this piece of equipment? Thanks

2008 bobcat 435 cracking noise when swinging and come to a stop