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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 025-010-N00
 (7)  Remove the streamered pin which holds the manual override lever for the bypass valve of the isolation valve in the open position.
 NOTE: Keep the bypass valve in the closed position during the
____ removal and installation of the hydraulic component. If the bypass valve is open, the hydraulic reservoir will drain.
 S 685-011-N00
 CAUTION:_______IMMEDIATELY CLEAN ALL OF THE HYDRAULIC FLUID THAT FALLS. THE HYDRAULIC FLUID CAN CAUSE CONTAMINATION OF THE AIRPLANE OR THE ENGINE.
 (8)  
Put an applicable container below the lower hydraulic actuator to catch the hydraulic fluid.

 S 025-012-N00

 (9)  
Disconnect the flex shaft from the lower non-locking hydraulic actuator to drain the hydraulic fluid from the flex shaft.

 S 025-013-N00

 (10)
 Disconnect the upper flex shaft and the lower flex shaft from the locking hydraulic actuator (Fig. 501).

 S 625-014-N00

 (11)
 Install protective caps on the upper and lower flexshaft ports on the center locking hydraulic actuator.

 S 025-015-N00

 (12)
 Remove the screws from the applicable access panel on the side of the thrust reverser sleeve (Fig. 501).

 S 025-016-N00

 (13)
 Remove the access panel.

 S 025-017-N00

 (14)
 Remove the nut, washers and bolt to disconnect the rod end of the locking hydraulic actuator from the clevis fitting on the thrust reverser sleeve (Fig. 501).

 (15)
 Remove the cap from the top flexshaft port on the actuator.

 S 025-018-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 985-019-N00
 (16)
 Turn the flexshaft drive with a 3/16-inch square drive to retract the actuator. Turn the flex shaft drive until the actuator is in the fully retracted posistion.

 S 215-034-N00

 (17)
 Make sure the actuator rod end is aligned with the clevis on the thrust reverser sleeve before you measure the clearance.

 S 625-020-N00

 (18)
 Install the protective cap on the upper flexshaft port of the locking hydraulic actuator.

 D.
Do the following steps to adjust the locking actuator:

 S 215-021-N00
 (1)  
Measure the clearance between the rod end collar and the actuator cylinder (dimension A in Fig. 501).

 S 215-022-N00

 (2)  
If dimension A is within the specified tolerance of 0.010-0.018 inches the actuator is adjusted correctly and no further steps are required.

 S 215-023-N00

 (3)  
If dimension A is out of the specified tolerance of 0.010-0.018 inches do the steps that follow to adjust the clearance of the actuator rod end:

 S 215-024-N00

 (4)  
Measure the clearance between the feedback stop bolt and the stop bracket slot on the center locking actuator (Fig. 501).

 NOTE:____Make a record of this dimension. The correct dimension is 0.030 - 0.060 inch (0.762 - 1.524 mm).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(5)  S 985-025-N00Turn the lock lever clockwise to release the actuator lock and extend the actuator rod end approximately 2 inches (50.0 mm).
 NOTE:____ Pull on the actuator rod end to extend it, but do not turn the actuator rod end at this time.
 (6)  S 825-026-N00If the clearance between the feedback stop bolt and the stop bracket slot was more than 0.060 inch (1.524 mm), do this adjustment: (a) Turn the actuator rod end counterclockwise one-half turn for each 0.020 inch (0.508 mm) of stop bolt clearance that is more than the specified dimension.
　
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