TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-2815-220-34 2-19. Generator a. Model AVDS-l 790-2C Engine (I) Removal. (a) Remo,•e self-locking nut and nat washer (I , fig. 2-14) and disconnect assembled wiring haess cable (2). Install self-locking nut and Oat washer. Remove self-locking nut and Oat washer (3) and disconnect assembled electrical lead (ground, 4). Install self-locking nut and Oat washer. (b) Remove capscrew and two nat washers (5) and remove and retain assembled electrical lead (ground, 4) for installation on replacement generator. Disconnect wiring haess electrical leads (6) and (7). I Sci f-locing nut and na1 washer 2 Assembled elecuical cable 3 Self-Jocking nu1 and Oa1 washer 4 Assembled electrical lead (ground) 5 Capscrew nnd Oa1 washer 6 Electrical lead (connec1or) 7 Elcc1rical lead (connec1or) Figure 2-14. Connec1i+g or disconnecting gerator electrical leads, mel AVDS-l 790-2C e11gine. (c) Disconnect oil inlet hose (1, fig. 2-15) and drain oil into a suitable container. Loosen l ocking nut (2) and remove oil inlet elbow (3). Remove and discard preformed packing. Retain elbow, nut, and washer for installation in replacement generator. Disconnect oil return hose (4). Remove and retain oil return hose union (5). Remove. and discard preformed packing. (d) Disconnect generator rear oil drain tube (6) and front oil drain tube (7) and drain oil into a suitable container. Remove and retain oil drain tee (8) for installation in replacement generator. Discon- nect and remove generator front oil drain tube and/or remove and retain front oil drain tube elbow and nip- ple (9). Disconnect vent hose (10). Remove and retain vent hose adapter (11) and vent restrictor (12). 2·36 Change 3 (e) Remove nut (13), and disengage generator cradle assembly retaining straps (14). Loosen nut (15) and remove 11V" band clamp (16). Remove generator (17) from cradle assembly (18). Remove tluee capscrews and flat washers, ( 19) and remove generator support (20) and cradle +s an assembly. I Oil inlei hose 2 Locking nut 3 Oil inlet elbow 4 Oil return hose S Oil return hose union 6 Rear oil drain tube 7 Front oil drain tube 8 Oil drain tee 9 Oil drain tube elbow and nipple 10 Vent hose 11 Vent hose adapter 12 Vent restrictor 13 Nut 14 Strap 15 Nut 16 "V" band clamp 17 Generator 18 Cdle 3ssembly 19 Cnpscrew and Oat washer 20 Support 21 Screw Figure 2-15. Removing or imtolling ge11crator, Model AVDS·l790-2C E+gi11e. I ) Position generator coupling tool, Part No. 11684153, on generator dtive adapter (2) and secure with band clamp (3). Using suitable block- ing material, block the crankshaft so it will not rotate. Using a 300 pound-feet capacity torque wrench, remove backlash and gradually increase torque to 167 pound-feet (fig. 2-15.1). If slippage occurs below 167 pound-feet, the drive gearshaft is defective and must be replaced. Check torque· rotational clenection rate. Using same coupling tool and torque wrench, apply 167 pound-feet torque. Note deflection in degrees from zero torque to 167 pound-feet torque. If rotation is less than 8 degrees, or greater than 17 degrees, the drive gearshaft is defective and must be replaced.