TM 10-3930-669-34 WARNING Oil  will  spray  from  cylinder  ports  when  rod  is  moved  in  or  out.    Cover  ports  with  two  cleaning cloths to prevent oil from spraying.  Failure to comply may result in injury to personnel. CAUTION Do   not   allow   threaded   or   machined   surfaces   to   come   in   contact   with   other   metal   surfaces. Clearances   between   cylinder   components   are   very   small,   any   minor   damage   done   during disassembly could require component replacement or make assembly difficult. (2) Position drain pan under pivot cylinder (1). (3) Move rod (2) out of cylinder (1) 9 in.  (23 cm). WARNING Use extreme care when removing or installing springs and retaining rings.  Springs and retaining rings  are  under  tension  and  can  act  as  projectiles  when  released  suddenly.    Ensure  proper  eye protection is worn to prevent injury to personnel. (4) Remove  retaining  ring  (3)  and  spacer (4) from cylinder (1) and head (5). NOTE Backup   seals   may   come   off   during this step. (5) Push   head   (5)   into   cylinder   (1)   until shear ring (6) is exposed. CAUTION Keep  rod  straight  and  concentric  in cylinder.        Do    not    allow    piston    to become wedged in cylinder or damage   to   cylinder   or   piston   may occur. (6) Remove  shear  ring  (6)  from  inside  of cylinder (1).  Discard shear ring. 15-39