TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-400-34&P 6 Adjust elevation machine thread plug (9) using a screwdriver. Check the torque or backlash and if still excessive, proceed to step 7. 7 Remove tapered pin (10), knob (1), and nonmetallic washer (11) from worm shaft (12). 8 Adjust externally threaded ring (13) using spanner wrench (8284045) to adjust torque or backlash. 9 Install nonmetallic washer (11) and knob (1) on worm shaft (12) and secure with tapered pin (10). CHECKING AND ADJUSTING ELEVATION KNOB TORQUEAND BACKLASH 1 Using torque wrench and torque adapter (8599909), measure the torque required to turn elevation knob (1). The torque shall be between 5.00 and 13.00 in.- lb (0.57 and 1.47 N-m). If not, adjust according to adjustment procedure. Refer to step 6. 2 Rotate elevation knob (1) in one direction to center bubble in elevation vial (2). 3 Scribe a line on boss (3) and elevation knob (1). 5-59