556 00724 REPLACEMENT WAFER PLATE Fits BARKO model B90 One New Aftermarket Replacement Excavator One New Aftermarket Replacement Excavator Swing Cylinder Seal Kit Fits Bobcat model: X 331 (Cylinder: 6537577 I&T Shop Manuals were originally published 40 years ago under the Intertec banner and designed for professional tractor repair mechanics The wafer plate (also called a valve plate or port plate) is a precision machined internal element of the hydraulic pump assembly that controls fluid porting directing hydraulic fluid flow into and out of the pump's displacement chambers Worn or damaged wafer plates cause loss of hydraulic pressure and pump efficiency