TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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1. Position shim (A) of predetermined thickness (fig. 6- 150) on inner race of lower driven gearshaft ball bearing. 2. Press fan driven gearshaft (B) into ball bearing. Figure 6-151. Pressing fart driven gearshaft into lower drive gearshaft ball bearing. 1. Position bearing spacer (A) on fan driven gearshaft and start upper driven gearshaft ball bearing on gearshaft 2. Press gearshaft (B) into ball bearing. Figure 6-152. Pressing fan driven gearshaft into upper driven gearshaft ball bearing. (b) Determine backlash for fan drive bevel gearshaft. Position original shims (fig. 6-123) on end of inner bearing race (side opposite bearing trade mark) of front bevel gearshaft ball bearing. Measure total thickness of bearing face and shim. from shim on inner race to face of outer race, with end play removed. Thickness should be from 0.7891-inch minimum to 0.791 1-inch maximum. When total thickness is more than 0.791 1-inch, strip 0.002-inch thick laminations from the shim pack until the correct thickness is obtained. When total thickness is less than 0.7891-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. 6-131