TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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b. Cleaning. Refer to paragraph 6-2. c. Inspection and Repair. Refer to paragraph 6-3 and 6-4, and (1) through (7), below. (1) Fan driven gearshaft and fan drive bevel gearshaft. Inspect fan driven gearshaft (74.1, fig. B-26) and fan drive bevel gearshaft (74.2, fig. B-26) to limits specified in overhaul stan- dards (table 6-25). Note. If either the fan driven gearshaft or the fan drive bevel gearshaft require replacement, both must be replaced as they are a matched gear set and cannot be replaced individually. (2) Oil seal. Replace the oil seal at each overhaul. (3) Housing assembly. Inspect housing assembly (50, fig. B-27) or housing assembly (23, fig. B-27) for loose dowel pins. (4) Clutch compression springs and balls. Inspect clutch compression springs ( 39, fig. B- 27) for weakness, broken coils, and distorted condition. Check balls (40, fig. B-27) and springs to limits specified in overhaul standards (tables 6-26 or 6-27). Note. Due to design changes on the mechanical clutch, two different size balls have been used. Carefully inspect all balls and discard any balls of 11 / 16 inch diameter. Overhaul clutch assembly using only the current 5 / 8 inch diameter balls, FSN 3110-462-0392. (5) Drive hub. Inspect drive hub (41, fig. B-27) or (46, fig. B-27) for raised metal surfaces, loose rivets, warpage or pitted surfaces caused by ball wear. Check bearing surfaces against limits specified in overhaul standards (tables 6-26 or 6- 27). Repair metal sufaces by polishing pitted areas smooth. (6) Clutch discs. Inspect clutch discs (48 and 49, fig. B-27) or 21, 22, 24, and 27, fig. B- 27) for cracks, warpage, wear, or other abrasive dam age. Inspect for excessive heat distortion. Repairs of clutch discs are not recommended. Replace discs if any of the above mentioned dam age is evident. (7) Studs. Refer to paragraph 6-4e, table 6- 28 and figure 6-148 when replacing studs. Figure 6-148. Front fan drive housing and mounting base - studding assembly. 6-126