TM10-3930-660-34 16-21.  PISTON PUMP - REPAIR (Cont’d) DISASSEMBLY NOTE Clean outside surfaces of the valve block and compensator before disassembly. 1. REMOVE COMPENSATOR (1). a. Remove four screws (2) and pull compensator (1) from valve block (3). b. Remove gasket (4) and O-ring (5) from compensator (1).  Discard gasket and O-ring. 2. REMOVE ROTATING GROUP PARTS FROM HOUSING (6) AND VALVE BLOCK (3). NOTE Piston (7) will slide from rod piston (8) and drop into the pump housing (6) when valve block (3) is removed from the pump housing (6). a. Remove six screws (9) and remove valve block (3) from housing (6). b. Remove and discard gasket (10). c. Remove wafer plate (11) from valve block (3). d. If necessary, remove pin (12) from valve block (3). e. Remove bearing (13) and spacer (14) from drive shaft (15). NOTE Three pins (16) will drop from the cylinder block (17) when rotating group parts (18) are removed from shaft (15). 16-129