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...