InsaneHydraulics - Sergiy Sydorenko © 2009-2011 All Ridghts Reserved
This very good looking and seemingly flawless copy of a valve plate for
Rexroth A6VM motor is, actually, a useless piece of scrap since the
curvature of the valve plate is not equal to that of the end plate!
To reveal the difference I marked the sealing surface and then
rubbed the plate against the end plate - you can see that the only
contact points are the extremities of the valve plate. Further
measurements showed that in the middle of the valve plate the gap is 0.3
mm wide - meaning - internal leakage and lots of it!
It's easy to feel that the part is bad by moving it
in its place - it "feels funny", the drag is not normal - it's too
However, due to the fact that the part is well finished, a less
experienced mechanic could easily mount this part without noticing that