TM 10-3930-659-34 5-9.  TRANSMISSION CONTROL VALVE MAINTENANCE (Con’t). b.  DISASSEMBLY CAUTION Use  care  when  separating  plate  from  valve  block.    Springs,  detent  ball,  and  detent  pin  may  be loose and could fall out of valve block, damaging parts. 1. Remove two screws (34), plate (27), and gasket (28) from valve block (31).  Discard gasket. 2. Remove spring (29), detent pin (30), spring (33), and detent ball (32) from valve block (31). 3. Remove drain plug (39) and filter element (37) from plate (27). 4. Remove preformed packing (38) from drain plug (39).  Discard preformed packing. 5. Remove screw plug (36) and preformed packing (35) from plate (27).  Discard preformed packing. 6. Remove screw plug (22), spring (24), and two pistons (25 and 26) from plate (27). 7. Remove preformed packing (23) from screw plug (22).  Discard preformed packing. 5-65