S 862-004

 (3)  
Put the speed brake control lever in the DOWN position.

 S 022-006

 (4)  
Remove the differential mechanism (Fig. 201):

 (a)  
Disconnect the speed brake pushrod from the differential mechanism: 1) Remove the bolt (4), washer (5) and nut (6).

 (b)  
Remove the bolt (4), washers (5), and nut (6) to disconnect the link from the central control actuator.

 (c)  
Remove the bolts (14 and 17), washers (15), and nuts (16) from the coupling on each output shaft.

 (d)  
Move the couplings on the differential mechanism output shaft.

 NOTE: It can be necessary to manually turn the central control
____ actuator link. The couplings can touch the ribs on the mechanism housing.
 (e)  Remove the four bolts (1), washers (2), and nuts (3) from the differential mechanism.
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A
747-400
MAINTENANCE MANUAL

SEE  A 1. BOLT 
2. WASHER 
3. NUT 
(4 LOCATIONS EACH  7. BOLT 
MECHANISM)  8. BUSHING 
SEE  B  9. WASHER 
4. BOLT  10. NUT 
5. WASHER 
6. NUT 
SPEED BRAKE 
SPOILER OUTPUT  PUSHROD  GREASE COVER 
QUADRANT (EXAMPLE)  (2 LOCATIONS) 
BOLT4. 
WASHER5. 
NUT6. 
BOLT11. 
12. BUSHING 
9. WASHER 
10. NUT 

SEE C
CENTRAL CONTROL ACTUATOR LINK
BOLT14. 
15. WASHER 
BULKHEAD  SPEED BRAKE  16. NUT  13. DIFFERENTIAL 
SEQUENCE MECHANISM  (4 LOCATIONS)BOLT WASHER 17. 15.  MECHANISM (2 LOCATIONS) 
A  NUT16. (4 LOCATIONS)  CENTRAL CONTROL ACTUATOR 

Spoiler Differential Mechanism Installation
Figure 201 (Sheet 1)

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A
747-400 MAINTENANCE MANUAL
CENTRAL
CCA INPUT  SPOILER OUTPUT
CONTROL  SPEED BRAKE
SHAFT  QUADRANT
ACTUATOR  INPUT CRANK
(2 LOCATIONS)
LEVER ASSEMBLY INPUT ROD
AB
AB
MOUNTING
BOLTS
(5 LOCATIONS) SPEED BRAKE COUPLING SEQUENCE (2 LOCATIONS) SEE D MECHANISM INPUT
SPOILER DIFFERENTIAL RETAINING
MECHANISM BOLT
B
COUPLING
BOLTS
SPOILER DIFFERENTIAL MECHANISM
MOUNTING BOLT SPACER NUT AND WASHER
C
Spoiler Differential Mechanism Installation
Figure 201 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

A-A B-B
DESIGN LIMITS WEAR LIMITS
PART WORN REPLACE  PART WORN REPAIR  INSTR REPAIR 
X  1 
X  X  1 
X 

PERMITTED MAXIMUMDIAMETER
INDEX
WEAR DIAMETER
PART NAME DIM.
NO.
MINIMUM MAXIMUM DIMENSION CLEARANCE INCHES INCHES INCHES INCHES (mm) (mm) (mm) (mm)
1
INPUT LEVER
 ID
 0.2495
 0.2505
 0.2535
 
(6.337)
 (6.363)
 (6.439)
 
BOLT
 OD
 0.2485
 0.2495
 0.2585
 
(6.312)
 (6.337)
 (6.566)
 
INPUT CRANK
 ID
　
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