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) Mechanical clutch assembly. Refer to figures 6-148, 6-144, 6-138, 6-136, 6-135, 6- 133, and 6-131 through 6-129. Note. When positioning balls in fan drive hub, place a dab of grease, (GAA) FSN 9150- 190-0905, on each ball pocket to facilitate keeping balls in proper location during assembly. (2) Front fan drive housing. Refer to figures 6-127, 6-150 through 6-152, 6-124, 6- 153, 6-122 through 6-119, and (a) and (b), below. Note. Before assembly of the front fan drive housing it will be necessary to determine the shim thickness required to control the end play of fan driven gearshaft and tbe backlash of fan drive bevel gearshaft. (a) Determine end play for fan drive gears haft. Position original shims (fig. 6-126) on end of inner bearing race (side opposite bearing trade mark) of lower driven gearshaft ball bearing. Measure the total thickness of bearing race and shim, from shim on inner race to supper face of outer race, with end play removed. Thickness should be from 1.2635-inch minimum to 1.2655-inch maximum. When total thickness is greater than 1.2655-inch, strip 0.002-inch thick laminations from the shim pack until the correct thickness is obtained. When total thickness is less than 1.2635-inch, add 0.002-inch thick shims (stripped from a new shim pack FSN 2930-678-3271) as necessary. Figure 6-150 illustrates shim location and measuring points. Figure 6-150. Determining shim thickness for front fan drive gearshaft and drive bevel gearshaft. 6-130