TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

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TA0217GS Fisure 2·11. Remoui11g or imrallins ge11era1or driue gear adap1er and associated parts, model AJIDS.J190-2C e11gi11e. washer in g�nerator (I 7) using new preformed packing and tighten locking nut (2). Install oil retu hose union (5) in. generator using new preformed packing. Install oil drain tee (8), drain tube elbow and nipple (9), vent restrictor ( 12), and vent hoe adapter (I l ) in generator. NOTE It is of utmost importance that the generator support and cradle assembly be installed in a manner that will not disturb generator mount- ing alinement and still fuish adequate support to minimize vibration. Misalinement of 0.010-in. in any direction is sufficient to cause a leak (pressure loss) between the generator mounting flange and the generator mounting adapter. (d) Install generator (17). Be certain genera- tor spline is properly alined with generator drive gear assembly, and one retaining strap is located behind the generator. Install "V" band clamp (16) and tighten nut (15). ( e) Position the assembled generator support (20) and cradle assembly (18) on oil pan and install three capscrews and Oat washers (19). Tighten screws only until heads engage washers I (finger-tight). Loosen two screws (21) allowing cradle to move freely in elongated holes n the support. Position retaining straps (14) over genera- l tor and secure with nuts (13). Tighten two screws (21) securing cradle to support. Tighten three capscrews (19). TM 9·2815-220-34 ) Connect vent hose (I 0) to vent hose adapter ( 11), front oil drain tube to drain lube tee (8) and elbow (9), and rear oil drain tube (6) to oil drain tee (8). Connect oil retu hose (4) to oil return hose union (5) and oil inlet hose ( I ) to oil inlet elbow (3). NOTE Most A VDS-1790-2C engines were built with the electrical leads (ground, fig. 2-14) secured to a common capscrew at the generator support. When installing the electrical leads (ground), each lead must be secured with an individual capscrcw. ( g) Clean electrical leads (ground) terminals. Install one flat washer in the generator support upper counterbore (fig. 2-17.1). Secure the inner lead with one Oat washer and capscrew. Remove lower right generator support capscrew and Oat washer. Discard capscrew. Tnstall one flat washer in generator support counterbore. s�cure the outer lead with one Oat washer and new capscrew (3/8-24 x 1-3/4 long). Torque tighten capscrews to 275 pound inches. Clean ground lead ends and hardware. Apply a liberal coating of silicone rubber, air-drying adhesive (MIL-A-25457) to the ground lead ends and attaching hardware. Optional materials include Dow Coing coating compound No. 3140 or RTV 3145; Dow Coing A-4000 also meets specification MIL-A-25457. 3/8-24 X 1·3/4 CAPSCREW i126227 re 2·17.1. /11stolli11g e/ectrlco/ fead (o1111d) (h) Connect wiring haess electrica I leads (6 and 7, fig. 2-14). Install assembled electrical lead (ground, 4) on generator terminal and secure with self-locking nut and nat washer (3). Install assembled wiring haess cable (2) on generator Change 3 2-37