After working my 2501 HST for about 5 hrs today I noticed some drips of something on my front axle on the loader control side. I swiped it and almost looked like grease, not so much like fluid. I found it was coming out of a small hole on the control valve. I assumed it would of been hyd fluid but like I said it was thick like grease.Is this hole supposed to be here? Is it a vent or something? Or is this a problem? I posted a picture of the part that this stuff was coming out of. Tractor just hit 10hrs.