TM 10-3930-664-24 D.  INSTALLATION 1. Attach  lifting  sling  and  hoist  to  intermediate  rail (31).  Raise rail enough to remove jack stands. 2. Position mainlift cylinders (37) into lower brackets (34). 3. Lower intermediate rail (31) until mainlift cylinder rod ends fit inside upper mounts. 4. Secure   top   of   mainlift   cylinders   (37)   to   upper mounts using screws (32) and nuts (33). 5. Secure    bottom    of    mainlift    cylinders    (37)    to brackets (34) using pins (36) and roll pins (35). 6. Remove lifting sling and hoist. 7. Install   elbows   (29)   and   new   O-rings   (30)   into bottom ports on mainlift cylinders (37).  Connect fittings (28) onto elbows. 8. Install fittings (26), elbows (25), and new O-rings (27) into top ports of mainlift cylinders (37). 9. Connect   tube   assemblies   (23,   24)   to   elbows (25). 2-443