TM 10-3930-659-34 5-9.  TRANSMISSION CONTROL VALVE MAINTENANCE (Con’t). 4. Apply a light coat of lubricating oil to piston (86). 5. Install  piston  (86)  in  valve  block  (31)  with  new retaining ring (87). 6. Apply a light coat of lubricating oil to piston (88). CAUTION Ensure that clip is installed in groove of piston and in slot inside the face of valve  block.    Con-  trol  or  function  of clutch   will   fail   to   operate   if   clip   is improperly installed. 7. Install  piston  (88)  in  valve  block  (31)  with  clip (89). 8. Apply a light coat of lubricating oil to piston (85) and spring (84). 9. Install spring (84) and piston  (85)  in  valve  block (31). 5-71

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