TM 10-3930-659-34 4-53.  ACCUMULATOR MAINTENANCE (Con’t). 7. new preformed packing (22), washer (21), valve (20), spring (19), and guide (18) on gas end cap (16). 8. Install backup ring (15) and new preformed packing (14) on gas end cap (16). 9. install gas end cap (16) in accumulator (7) with snapring (17). 4-200