TM 10-3930-659-34 4-53.  ACCUMULATOR MAINTENANCE (Con’t). 10. adapter  (28),  preformed  packing  (29),  ball  (30), spring  guide  (31),  and  spring  (32)  from  oil  cap (26).  Discard preformed packing. 11. Remove piston (35) from accumulator barrel (23). 12. Remove two backup rings (33), preformed packing (34), backup ring (37), and preformed packing (36) from piston (35).  Discard preformed packings. 4-198