(b)
Monitor the torque on the dial indicator.
NOTE: When the the torque increases by 15-20 pound-inches the
____ internal stops are againts each other.
(c) Turn the torque wrench five turns counterclockwise.
NOTE: This is the rigged closed position.
____
S 864-009
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers for the side cargo door:
(a)
P415 Power Distribution Center - Right
1) 415F17 SIDE CARGO DOOR CONT
(b)
P715 Aux/Ext No. 2 Power Center
1) SIDE CARGO DOOR PWR
S 644-021
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR AND
_______ THE DOOR OPENING WHEN YOU OPERATE THE DOOR. FAILURE OF THE LIFT MECHANISM COULD CAUSE THE DOOR TO CLOSE QUICKLY WHICH COULD CAUSE INJURY OR DAMAGE.
(3) Lubricate the splines on the actuator (1), torque tube (5) and couplings (11) with grease.
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MAINTENANCE MANUAL
INTERNAL INTERNAL
-5 0 5 10 15 105 110 115116
TURNS OF MANUAL DRIVE TORQUE WRENCH
NOTE: THE TURNS ARE THE NUMBER OF TURNS OF A TORQUE WRENCH IN THE MANUAL DRIVE. COUNT THE TURNS AFTER YOU FIND THE INTERNAL STOPS.
USE A TORQUE WRENCH TO FIND THE
INTERNAL STOPS OF THE ACTUATOR AS FOLLOWS:
1.
MEASURE THE TORQUE (M) WHILE YOU MANUALLY TURN THE ACTUATOR.
(THE TORQUE SHOULD BE CONSTANT WITHIN |2 POUND-INCHES).
2.
TURN THE ACTUATOR UNTIL THE TORQUE INCREASES BY 15-20 POUND-INCHES (M + 15).
3.
TURN THE ACTUATOR 1/2-TURN IN THE OPPOSITE DIRECTION FROM THE (M + 15) POINT.
4.
THE INTERNAL STOPS ARE AT THIS POINT.
INITIAL SWITCH ADJUSTMENT ONLY. SEE THE TEXT FOR THE FINAL ADJUSTMENT.
Hook Actuator Internal Stop and Rig Positions
Figure 402
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(4) S 424-012Installing the aft actuator (1) as follows: (a) Put the actuator output shaft into the end of the torque tube (5) in the support bracket. (b) Align the mounting holes in the actuator (1) and support bracket. (c) Install the bolts (2) that hold the actuator (1) to the support bracket as shown in Fig. 401.
(5) S 424-013Install the forward actuator (1) as follows: (a) Install the bolts (2) that hold the actuator (1) to the support bracket as shown in Fig. 401. (b) Push the torque tube (5) into the actuator output shaft. (c) Install the coupling (11). (d) Install the two clamps (6).
(6) S 834-014Set the hook in the rigged closed position (hook opening up) and install the rigging pin SCD-5 through the hook and support housing.
NOTE:____ Adjust the hook shaft pushrod until you can install the rig pin.
(7) S 034-015Remove the pin SCD-5.
(8) S 424-016Connect electrical connector DX211 or DX212 to the actuator.
(9) S 824-023Adjust the hook closed switches as follows:
NOTE:____ These steps are for the forward and the aft hook closed switches.
(a) Turn the manual drive of the hook actuator clockwise until it hits the internal stops as follows: 1) Use a torque wrench with a dial indicator to manually turn the actuator clockwise at 25 |5 pound-inches torque.
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747-400 MAINTENANCE MANUAL
2) Manually turn the actuator until the torque increases by
15-20 pound-inches.
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