TM 10-3930-664-24 B.    CLEANING Clean  regulator  assembly  components   in accordance with paragraph 1-24. C. INSPECTION     Inspect  regulator  assembly  components  in  accordance with paragraph 1-24. D. REPAIR Repair  of  the  pressure  regulator  assembly  consists  of removal   and   replacement   of   defective,   deformed,   or damaged components. E. ASSEMBLY 1. Install piston (2) and spring (3) into sleeve (4). 2. Compress piston (2) and spring (3).  Install new pin (1) into sleeve (4) using a soft head hammer. FOLLOW-ON MAINTENANCE: Install pressure regulator assembly (para.  3-31) END OF TASK 4-39