REPAIR OR REPLACEMENT
Repair is by replacement of authorized parts that do not meet inspection criteria. Refer to WP 0142 00.
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary (M137 only).
Place optical element gear block assembly (1) in counter box assembly (2).
Use sealing compound in well-ventilated area away from open flame. Sealing
compound is harmful to skin and clothing and may give off harmful vapor. Exercise
care whenever sealing compound is used.
Apply sealing compound (item 13, WP 0152 00) to threads of three machine screws (3).
Install three new lockwashers (4) (item 13, WP 0142 00) and three machine screws (3). Tighten screws.
Place counter mount (5) on rotating counter (6).
Apply sealing compound (item 13, WP 0152 00) to threads of four socket head capscrews (7).
Install four new lockwashers (8) (item 4, WP 0142 00) and four socket head capscrews (7). Tighten
If new rotating counter or reset coupling is required, timing must be maintained. To
accomplish this, follow steps 7 through 14.
If original rotating counter or reset coupling is to be reassembled in counter box
assembly, proceed to step 15.
Position reset coupling (9) on shaft of rotating counter (6). Install a 0.112-48 thread setscrew in reset
coupling; do not tighten at this time.
Temporarily install rotating counter (6) and counter mount (5) in counter box assembly (2).
Temporarily install knob assembly (WP 0098 00). Set rotating counter so that numbers are aligned as
seen through the optical instrument window.