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Message: <blockquote data-quote="Tazza" data-source="post: 15675" data-attributes="member: 82">It doesn't *seem* to be the hydrostatic pumps, i can move my levers and the noise is still there, its not the usual groan you hear when the pump is fighting the motors when the park brake is engaged.... The brake is so far out of adjustment you can drive it around with the brake on! I will need to set neutral and adjust the brake over the next few days.skidboy - you may be on to something, i had a fiddle today and the tube line that comes from the oil cooler and filter to the control block is the one that is humming, I'm wondering of my filter is plugged and thats the oil going over the high pressure by-pass valve or not. I'm going to grab a filter anyway. Do you remember just where this cold weather by-pass valve is on the control block?</blockquote>