Use cleaning compounds in well-ventilated area away from open flame. Cleaning
compounds are harmful to skin and clothing and may give off harmful vapor.
Remove rust, corrosion, dirt, and grease from metal parts. Remove dirt and grease using cleaning
compound (item 10, WP 0152 00).
Clean optical lenses and prisms using technical acetone (item 1, WP 0152 00) or denatured alcohol
General procedures for cleaning metal parts and optics, removing corrosion, staking
pins, and other procedures are contained in TM 9-254.
REPAIR OR REPLACEMENT
Refer to TM 9-254 for general repair instructions.
Repair is by replacement of authorized parts that do not meet inspection criteria. Refer to WP 0139 00.
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary (M137 only).
Apply a light coat of grease (item 15, WP 0152 00) to new O-ring (1) (item 2, WP 0139 00) and install
1.80 in. (45.72 mm) inside elbow telescope (2).
Place optical cell assembly (3) inside elbow telescope (2).
Install two setscrews (4) to retain optical cell assembly (3).