InsaneHydraulics - Sergiy Sydorenko © 2009-2011 All Ridghts Reserved
To the left you can see a damaged craddle bearing from an open circuit
Linde HPR pump. This type of damage is not very common - the bearing
literally split in half along the lubrication channel of the hydrostatic bearing.
The first thing that came to my mind was -
overpressure. This bearing is constantly connected to the system
pressure, which is fed to it through the bias piston, the hollow
connecting rod, and finally the channel inside the swashplate (check out
the exploded view).
Since the counteracting servo piston has a bigger area, theoretically it
is possible to create a higher than system pressure in the bias
cylinder and, consequently, in the hydrostatic bearing, if some
obstruction of the flow coming out of the bias cylinder during the
displacement transition stage occurred. And I did look everywhere for it
- and found nothing... Maybe it was just a bad bearing...
In any case - it made this nice set of pictures.