TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 5.1-21. BASE MAINTENANCE INSTRUCTIONS - continued c. Assembly NOTE 1 2 3 4 5 6 7 8 9 There are no repair parts for the differential assembly. Illustration is for assembly only. Apply grease (item 6, appx B) to teeth of spur gears (1 and 2). Install spur gears (1 and 2) in slot of shouldered shaft (3) with hub extensions in opposite directions. Apply grease (item 6, appx B) to two shafts (4) and install to secure spur gears (1 and 2) in shouldered shaft (3). Apply grease (item 6, appx B) to teeth and inner wall of cluster gears (5 and 6) and install over spur gears (1 and 2). Check differential assembly by rotating either cluster gear while holding shouldered shaft still. The other cluster gear should turn in the opposite direction, and there should be no binding or noticeable backlash. Test for backlash by grasping either cluster gear and the shaft end and attempting to turn the other cluster gear. Apply grease (item 6, appx B) to both ends of differential assembly (7). Install long end of shaft through bracket (8). Install short end of shaft into base bushing, and slide bracket (8) into position on base (9). Aline bracket holes with two straight pins (10), and tap straight pins through base until flush with rear surface. Install two new lockwashers (11) and two screws (12). Install spur gear (13) on shaft of differential assembly (7) and secure with tapered pin (14). 5.1-56 Change 1