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Message: <blockquote data-quote="Tazza" data-source="post: 25144" data-attributes="member: 82"><p>From memory its plumbed across the hydraulic lines. Essentially the throry was when you have a blade weighing say 20kg spinning at 600 RPM you have a LOT of potential energy there. This is great for mowing as you hit a larger sapling and it will simply cut through it, but when you turn your aux hydraulics off it basically dead ends the hydraulic lines, so the motor will want to keep spinning with the weight of the blade. This will cause pressure spikes in the lines and motor, this potentially can blow seals or cause damage to the internals of the motor. You will find when you rotate a motor by hand, they become a crude hydraulic pump, thats why you get pressure spikes.</p></blockquote><p></p>