TM 10-3930-664-24 CAUTION Use  care  when  removing  O-ring  (26) and   cup   (27)   to   prevent   damage   to piston (25). 9. Carefully pull push rod and piston (25) from cylinder housing (23).  Remove and discard O-ring (26) and cup (27). 10.  Remove stem assembly (28) from cylinder housing (23). WARNING Stem assembly is under spring tension. Use care when disassembling   to   prevent   injury   to personnel. 11.  Remove snap ring (35) from stem (29) and discard. Remove retainers (30, 32) and springs (31, 33). 12.  Discard stem (29) and seat (34). B. CLEANING WARNING Isopropyl alcohol is flammable. Inhalation of vapors can cause dizziness    and    headache.        Contact with   skin   may   cause   irritation.      To avoid   injury,   observe   the   following precautions: - Keep isopropyl alcohol away from open flame or any spark (ignition source). - Keep at least a B-C fire extinguisher within easy reach when working with isopropyl alcohol. - Post signs that read "NO SMOKING WITHIN 50 FEET" when working with isopropyl alcohol. - Ensure adequate ventilation.  If vapors cause drowsiness, go to fresh air. - If liquid contact skin or eyes, immediately flush affected areas thoroughly with water. Clean cylinder components in isopropyl alcohol.  Allow to air dry. 3-84