MAINTENANCE OF M139 ELBOW TELESCOPE (CONT).
Clean all parts per TM 9-254.
Eyepiece assembly is a repairable assembly; refer to page 3-12.
Reticle assembly is a repairable assembly; refer to page 3-15.
Objective cell assembly is a repairable assembly; refer to page 3-16.
Repair is by replacement of authorized parts as required. Refer to appendix B.
Install identification plate (1) on cover (2) using
two screws (3).
Install screw (4).
Install window (5) and observation window (6).
Apply sealing compound (item 10, appx C) to
Install objective cell assembly (7) in body (8).
Setscrew will be tightened during
parallax inspection, and adjustment will
take place in final inspection procedures.
Install setscrew (9), but do not tighten.