TM 9-1240-401-34&P
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4-21. COUNTER BOX ASSEMBLY (COUNTERS) MAINTENANCE INSTRUCTIONS
- continued
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c. Assembly - continued
NOTE
If the counter box assembly has a tapped hole
to screw purging valve stem into, nut (7) is not
required.
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Apply sealing compound to threads of nut (7) and
purging valve stem (10).
Install retaining strap (11), purging valve stem (10),
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nut (7), valve core (9), and air valve cap (8).
If removed, install plug (6).
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If removed, install two headless straight pins (5).
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Install cover (3) with related parts on counter box
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assembly (4) and secure with four new lock-
washers (2) and four machine screws (1).
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Using elevation handwheel (38), set correction
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counter (39) to 0000. Rotate elevation handwheel
(38) counterclockwise and ensure correction
counter (39) attains a minimum reading of 1335
roils.
4-44