Hi guys , first time poster, we have a bomag 120 ad3 , we bought it at auction and only realised after that it has an issue , engine great ! On the button , moves fine , vibrates good , but if it’s running for 20mins or so it locks on , and will not move until it cools down, I’m guessing the oil heats up , thins a bit then it’s by passing seals or something like that , or it’s lost hydro pressure to move the drums , has anyone had experience of this ? Can anybody help me with what it might be?