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Message: <blockquote data-quote="Mike10" data-source="post: 60693" data-attributes="member: 5461">Since the pump looks ok I would start with the check valve.  Remove the charge pressure hose from the top of the hydro pumps and plug.  Have the thottle lever in the off position so the engine will not start.  Crank the engine and see if it builds pressure in the charge line and gets close to the 150.There is a forward and reverse relief valve in each pump body.  Unlikely that both relief valves would fail at the same time.  You can reach two of the relief valves from the top.  One for the right side and one for the left side.  You can remove these two and switch them and see if the right side will move either forward or backward.If you have a bad internal leak you will have a lot of oil going out the case drain line.  The case drain lines come out the side of the pumps and goes to the left chain case.  Remove the lines and install hoses with one end in a bucket.  Start the engine and see how much oil is being drained from the cases.  If you have a big stream you have an internal leak.  There is always some oil leaking internally but should be a small stream. I would not worry about the motors at this point.  They only get oil when the levers are stroked.  You may hear noise coming from the motor because the motors are not getting a good supply of oil and the pistons are slapping against the swasch plate.A week hyd pump would be noticable in the lift and bucket circuits.  If the engine pulls down when the bucket or lift is dead headed then the pump should be good enough to operate the hydro.Does the engine pull down any when operating the right control lever?</blockquote>

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