Took 4 years but finally scored a smokin deal on a used 6' KK. When i checked the fluid levels on both the cear box and the gear case i noticed the the vents are not a "free flowing' vent meaning that when i put a little air to them no air came out. Are they supposed to be like this? Does pressure build to a certian point then it releases it? When i took it out of the side cover you could hear the air hissing out, its less than a year old and has only been used twice to till about 1 acre. Just want to make sure everything is good to go before i put it to work...................