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Message: <blockquote data-quote="tech.35058" data-source="post: 141908" data-attributes="member: 14347">You refer to "we", so I assume you are not working alone.Considering  how much "fun" this  operation is, I am asking  dumb questions ...  "(had the pump checked out)" , did this mean they took it apart & put it back  together, or they bench tested it, ( pumped fluid through it, verified that it turned, the control levers operated & fixed any leaks)by "Main pump" are you referring to right hand pump or left hand pump ( oriented with the operator sitting in the machine) ? are you describing a sound like raking the gears shifting gears in a manual transmission, or perhaps the sound of a slipping clutch disk?  If the left hand  pump was the one that you removed & re-installed, is there any chance that you might have failed to align/mesh the drive gears in the pump drive/engine flywheel housing?   Is the parking brake jammed or frozen/seized in an "applied" state?  Removing the side cover between the left side wheels and watching while helper moves the control might also might also provide a clue.</blockquote>