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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
5) Actuate the bleed system again to the valve closed (actuator piston shaft forward) position. 6) Measure the adjusted dimension again between the piston shaft end and the established housing reference point. 7) The adjusted Dimension D should be 0.015 inch (0.381 mm) minimum greater than Dimension B.
8) If Dimension D is still not within the limits, do this step again only enough times until Dimension D is within the limits.
(c) Make the final compression adjustment as follows (Fig. 501, View C-C, Final Compression Adjustment): 1) Actuate the bleed system to the valve open (actuator piston
shaft rearward) position. 2) Remove pressure to the actuator. 3) Turn the piston shaft 1/4 turn (90 degrees) clockwise. 4) Supply 100 psig pressure to the actuator again. 5) Actuate the bleed system again to the valve closed
(actuator piston shaft forward) position. 6) Measure the dimension between the end of the piston shaft
to the established reference point on the actuator housing. 7) Record this measurement as Dimension E. 8) Compare Dimension E with Dimension B. 9) Dimension E should be within 0.005 inch (0.127 mm) of
Dimension B.
(d) If Dimension E is not within 0.005 inch (0.127 mm) of Dimension B, do as follows: 1) Actuate the bleed system to the valve open (actuator piston
shaft rearward) position. 2) Remove pressure to the actuator. 3) Turn the piston another 1/4 turn (90 degree) clockwise. 4) Supply 100 psig pressure to the actuator again. 5) Actuate the bleed system again to the valve closed
(actuator piston shaft forward) position. 6) Measure Dimension E again. 7) Dimension E should be within 0.005 inch (0.127 mm) of
Dimension B.
8) If Dimension E is still not within the limits, do this step again only enough times until Dimension E is within the limits.
(e)
Cycle the bleed valve between the open and closed positions to verify that the 2.5 bleed valve assembly can be moved freely.
(f)
Remove pressure to the actuator.
(g)
Remove power from the pump.
(h)
Set the POWER switch on PWA 85842 Electrical Control Box to the OFF position.
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S 415-092-N00
(4) Install the shoulder bolt.
(a) Install the (LEFT-HAND THREAD) shoulder bolt to the piston shaft as follows: 1) Apply Engine Oil (P03-001) to the threads on the shoulder
bolt.
CAUTION: TO PREVENT LOSS OF ADJUSTMENT OR DAMAGE TO THE
_______ SHOULDER BOLT, MAKE SURE YOU HOLD THE ACTUATOR PISTON SHAFT HEX NUT WHEN YOU TORQUE THE SHOULDER BOLT.
2) Hold the piston shaft hex with a wrench and tighten the shoulder bolt (LEFT-HAND THREAD). 3) Tighten the shoulder bolt (LEFT-HAND THREAD) to 50-70 pound-inches (5.6-7.9 newton-meters).
4) Remove any contamination (oil, fuel, grease, or dirt) from the end of the piston shaft where you must install the cotter pin and sealant.
5) Install a new cotter pin to the piston shaft and shoulder bolt.
NOTE: You can turn the shoulder bolt 30 degrees
____ maximum in either direction to install the cotter pin. This adjustment for the cotter pin will keep the torque on the shoulder bolt satisfactory.
6) Apply Silicone Rubber Sealant (P09-014) to both ends of the cotter pin.
S 845-093-N00
(5) Remove the adjustment equipment as follows:
(a) Disconnect the connector for the Electrical Control Box from the actuator receptacle.
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