TM 10-3930-659-34 5-9.  TRANSMISSION CONTROL VALVE MAINTENANCE (Con’t). 31. Install new preformed packing (23) on screw plug (22). 32. Apply a coat of lubricating oil to piston (26). 33. Install two pistons (25 and 26), spring (24), and screw plug (22) in plate (27). 34. Install new preformed packing (35) on screw plug (36) and install screw plug in plate (27). 35. Install new preformed packing (38) on drain plug (39), and install filter element (37) and drain plug in plate (27). 36. Install detent ball (32), spring (33), detent pin (30), and spring (29) in valve block (31). 37. Install new gasket (28) and plate (27) on valve block (31) with two screws (34). 5-75