TM 10-3930-659-34 4-67. CARRIAGE TILT CYLINDER REPAIR (Con’t). NOTE Note position of wear rings, piston seal, and spacer to aid during assembly. 6. Remove  two  wear  rings  (14),  piston  seal  (16),  and  spacer  (15)  from  piston  (10).    Discard  piston  seal  and  wear rings. NOTE Note position of backup rings and preformed packings to aid during assembly. 7. Remove two backup rings (12) and preformed packing (13) from piston (10).  Discard backup rings and preformed packing. TA708423 4-275