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Its HST, and no mods to tractor. The backhoe is connected, I've only disconnected it once, and don't remember then if it did it or not. Think it could just be pressure returning from backhoe? I think it has made the noise since new, I can't be 100% sure as I was excited to be using it when...

I just bought a new L3901 and I get a hissing sound/noise near the transmission area (below gage cluster) at idle after the tractor has warmed up. When I first start it, no noise there, however, after using it a few minutes I can hear a hissing noise only at idle. Could it be a relief in the...