TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-400-34&P CHECKING AND ADJUSTING CORRECTION COUNTER DIAL 1 With M137 telescope mount level and elevation counter (1) set to "0000", check that correction counter (2) is set to "0" when correction knob (3) is rotated nine clicks from either stop position. If not, proceed to step 3. 2 Remove two screws (4) and telescope mount shield (5) to gain access to two setscrews (6) in correction counter (2). 3 To position correction counter (2), loosen two setscrews (6), obtain setting "0" in telescope mount shield (5), then tighten two setscrews (6). CHECKING AND ADJUSTING ELEVATION AND CORRECTION COUNTERS ALINEMENT 1 With cover assembly (1) in place over telescope mount subassembly (2), check that zeros (top, side, and bottom) appear through two observation windows (3) within 1/16 in. (1.6 mm). 2 If required, remove elevation counter (4) and pins (5), then relocate and reassemble with next larger pins. 3 Apply a coat of adhesive (item 4, appx C) to edge of cover assembly (1). 4 Replace cover assembly (1) and secure with four screws (6) and four lockwashers (7). 5-65