GC2300 Issue, been chasing this for over a year...

[stvman]

eeglot, Have you checked the sight glass at the back of the tractor when you are getting the noise? (look for foam) hydraulic fluid can foam when it gets real hot. It will shurely make the pump and lines squeal if the oil is foaming.

 

[wyomingangus]

Eric-
this is normal in several hydrostatic drive models. As long as you are maintaining the right hydraulic pressure your fine. It's the same concept as having a helicle gear vs. a straight gear in your transmission. The hotter and higher they are ran the more noise you'll experience.