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    Inside a classic external gear pump, pressure induced forces push the gears against the housing, causing characteristic wear of the suction side.  Even new pumps present this type of wear, which is completely normal, and allows us to distinguish with one hundred percent certainty the pressure side from the suction side.

    As a rule this wear is measured in tenths of millimeter, however the "Commercial/Parker" you see to the left measures the same wear in centimeters, proving once again that there are hydraulic equipment owners out there, who consider shutting down a prime mover when a function problem is detected an absolutely unnecessary precaution. 
Gear pump, severely damaged
Gear pump, severely damaged
Gear pump, severely damaged
Gear pump, severely damaged
Gear pump, severely damaged
Gear pump, severely damaged