TM 10-3930-659-34 5-9.  TRANSMISSION CONTROL VALVE MAINTENANCE (Con’t). 24. Remove   clip   (89)   and   piston   (88)   from   valve block (31). 25. Remove retaining ring (87) and piston (86) from valve block (31).  Discard retaining ring. 26. Remove retaining ring (92), washer (93), shaft seal (94), washer (95), and gearshaft valve (91) from valve block (31).  Discard retaining ring and shaft seal. 27. Remove orifice (90) from valve block (31). 5-69