SHIM
LATCH
FITTING
FWD GUIDE ROLLER
A
Guide Roller Adjustment Figure 506
RAMP
CHANNEL
FORWARD GUIDE ROLLER RAMP
SHIM
LATCH
FITTING
4.31
INCHES
4.27
H36687
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A
747-400
MAINTENANCE MANUAL
ROTARY ACTUATOR
ARM AND LINK
(2 LOCATIONS)
SEE A
GEARBOX AND BRAKE ASSEMBLY (2 LOCATIONS)
LIFT
POWER UNIT
FWD
DOOR DOWN STOP
ROTARY
ACTUATOR
0.20 INCH
ADJUSTABLE END OF LINK
ROTARY ACTUATOR ARM
ROTARY ACTUATOR SLIP JOINT
LINK
DOOR END OF LINK
UP STOP
A
Lift Mechanism Adjustment
Figure 507
H36692
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A
747-400
MAINTENANCE MANUAL
AFT GEARBOX
AND BRAKE ASSEMBLY
FORWARD
GEARBOX AND
BRAKE ASSEMBLY
A
SEE A
GEAR BOX
A
BRAKE
TORQUE WRENCH
ADAPTER
TORQUE
WRENCH
A LOCK BOLT
BRAKE HOUSING
TORQUE
ADJUSTING
RING
GEAR
BOX
A-A
Brake Assembly Adjustment
Figure 508
H36695
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A
747-400
MAINTENANCE MANUAL
Not Used
Figure 509
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H36700
A 747-400 MAINTENANCE MANUAL
STOPS INTERNAL HOOK STOPS INTERNAL
HOOK ACTUATOR DIAGRAM
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.
Latch and Hook Actuator Internal Stop and Rig Positions
Figure 510 (Sheet 1)
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H36739
A
747-400
MAINTENANCE MANUAL
EXTERNAL STOPS EXTERNAL CONTACTED AND STOPS RIGGED CLOSED CONTACTED
1
(M + 15)
1
MANUAL DRIVE CRANKING TORQUE
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