Looking at buying a TLB, is this normal bushing wear at 3600 hours ?

https://www.machinerytrader.com/listings/construction-equipment/for-sale/23523383/2005-cat-430d Is this machine, a good deal ? In the second video at :40 seconds also at 3:30 the bushings show wear. What's considered excessive wear ? What would it cost to re-bush this type of machine ? Thanks in advance..