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 ball bearing and shim (6) from accessory driven gearshaft (4). (2) Cut four pins 7/16-inch (approx.) long from 7/32- inch diameter brass brazing or other soft material. Insert the pins in the four equally spaced holes in bear· ing portion of advance vane cover. An improvised ring compressing ol of the type shown in figure 2-1 can be fabricated to facilitate removal of the advance vane cover internal retaining ring. If the improvised tꝏl is used, install it over the pins and tighten bolts suffi. ciently compress the advance vane cover inteal · taining ring. (3) Install accsory drive gearshaft in a soft. jawed vise and using a gear puller remove advance vane housing cover (fig. 3-77). (4) Remove retaining ring (0, fig. 3·æ) and plug (47) from accessory drive gearshaft. CAUTION Use extreme care in this operation pre· vent damage vane cover or gearshaft. Figure 3-237. Remo11ing odvo11ce vane /1owing cover. 3·97. Cleaning Refer to paragraph 3-36. 3-98. Inspection and Repair a Genel. Refer paragraphs 3-% and 3-&. b. Fan Driue Gearsltaft and Fa+ Driue Bevel Gearshaft. Inspect fan driven gearshaft (8, fig. 3-æ) n and fan drive bevel gearshaft (7) to limits specified in t repair standards (table 3-23). NOTE If either the fan driven gearshaft or fan drive bevel gcarshaft require replacement, both must be replaced as they are a matched gear set and cannot be replaced in- dividually. c. Oil Seal. Refer paragraph 3-37. d. Clutch Assembly. Refer paragraph 3-] and ta- 3·140 Change 2 hies 3. and 3-21. e. Housing Assemblies. Insפct fan drive clutch disc housing (2, fig. 3-Ü) rear cꝏling fan drive housing (4, fig. 3·71) accery drive housing (') and rear cꝏling fan and accessory drive housing base () for le dowel pins and oil transfer tus if applicable. f. Aduance Unit Seals and Springs. Inspect als (7, fig. 3·ì) and springs (24) for cracks, indentations, and wear. Check seals to the limits specified in repair stan- dards (table 3-7). g. Flyweht Spn'ngs. Inspt flyweight springs (4, fig. 3-ì) seats (6) and retainers (21) for cracks and damage. Chk spring tension limits specified in repair standards (ble 3-24). h Studs. Refer paragraph S, table 3- and figure 3-î when replacing studs.