Takeuchi TB070 valve assembly on top of hydraulic filter cartridge.

I just purchased a 2000 Takeuchi TB070 4500 hrs on Saturday. For a demonstration, the guy worked it for about a half hr digging a trench. He worked it hard and everything sounded smooth as silk the whole time. I bought it. When they were loading it up on the trailer on Monday, I noticed the hydraulic pump was whining when traveling, using the boom or bucket but not swing and not blade. I told the guy that I didn't hear that noise on Saturday. He said well it can only be a few things, low...

Takeuchi TB070 valve assembly on top of hydraulic filter cartridge.

Takeuchi TB070 valve assembly on top of hydraulic filter cartridge.