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    Everybody who works with oil-hydraulics knows what a gerotor motor is - the most wide spread type of hydraulic motor in the world, cheap, reliable, high torque and compact - therefore the ideal solution for low and medium speed applications.

    Although most of the times when such a motor malfunctions you throw it away and buy a new one, there are still times when you need to "get inside", like, for example, to change seals, or to evaluate it's condition and type of wear.

    Despite of the fact that these motors have been on the market since the Noah days, and are ve-e-ery easy to dismount, there are still mechanics who, when disassembling such motors (I am talking about OMS type, the one that has the oil distribution part in the end cap, not the OMR, which uses the shaft grooves to distribute the oil), use the "hit and run" technique to push out the valve plate, which is inside the end cap and is held in place by the vicious oil seals. By "hit" I mean hit it hard, and by "run" I mean run away fast either because a finger's gotten in between the end cap and the bench, or because the end cap's landed on a foot of the shop foreman standing near-by.

     I get to visit many workshops dealing with such motors, and I have seen "hit'n'run" countless times. To put an end to this barbarous tradition  I combined this short video. You might want to turn the sound on, the psychological impact will be stronger...