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    Here you have a good old Sauer Danfoss series 90 closed loop pump, which got so worn, that the brass part of the barrel disappeared completely! I don't know the story of this particular pump, but it made me remember a troubleshooting episode I participated a couple of years ago, which involved an alike series 90 with a similar type of damage.

    If you look at the last two pictures (I apologize for the quality - these were taken by my cell), you will see a pump, which got the same king of damage, but was still able to deliver usable flow at 400 bars (with the charge pressure falling to around 16 bars at that point) - I personally was involved in the troubleshooting of the machine (small agricultural vehicle), and I guarantee that it's true! The rest of the circuit was OK, and the oil was at working temperature! I still can not find an explanation of how a closed circuit pump, worn-out to this state (the groove in the valve plate alone was almost half a millimeter deep!), was able to produce any flow at all!!!
Sauer Danfoss Series 90 Damaged Badly
Sauer Danfoss Series 90 Damaged Badly
Sauer Danfoss Series 90 Damaged Badly
Sauer Danfoss Series 90 Damaged Badly
Sauer Danfoss Series 90 Damaged Badly