S 214-051

 (7)  
Make sure the operation on the inside of the actuator is smooth through the limits of operation.

 NOTE: If you can hear clicks, the operation is not smooth.
____
 S 224-055
 (8)  
Do a check of dimension A on the remaining guides.

 S 834-052

 (9)  
If the dimensions are not correct, adjust the linkage rods to get the correct dimension.

 H. Put the Airplane to Its Usual Condition.
 S 864-057
 (1)  For the applicable guide rail actuator, remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  
P86 Forward Lower Cargo Equipment Panel
 1) BAY 2 RIGHT
 2) BAY 2 LEFT
 3) LATERAL GUIDE FWD
 4) LATERAL GUIDE AFT

 (b)  
P59 Aft Lower Cargo Equipment Panel
 1) BAY 9 RIGHT PDU

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (c)  2) BAY 9 LEFT PDU 3) BAY 10 RIGHT PDU 4) BAY 10 LEFT PDU 5) LATERAL GUIDE ACTUATOR 6) AFT LATERAL GUIDEP414 Main Power Distribution Center Panel - Left 1) 414F15 CARGO DOOR CONTROL FWD 2) 414F16 CARGO DOOR CONTROL AFT
 (2)  S 864-034Extend the guide rails.
 (3)  S 864-053Move the power drive switch to the OFF position.
 (4)  S 414-035Install the structural door assembly with the splitter rail at Sta 664 and 1852 (BL 0.0).
 (5)  S 414-054Install the ball-transfer panels if it is necessary (Ref 25-53-15/401).
 (6)  S 864-036Push the caution light on the control panel to turn off the light that flashes.
 (7)  S 094-037Remove the safety barrier from the cargo door if it is necessary.
 (8)  S 414-038Close the cargo door if it is necessary (Ref 52-34-00/001).
 (9)  S 864-039Remove electrical power (Ref 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 GUIDE RAIL EXTENSION/RETRACTION LINKAGE - REMOVAL/INSTALLATION
______________________________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
 (1)  
The removal of the linkage rod assemblies for the lateral guide rail.

 (2)  
The installation of the linkage rod assemblies.

 B.  The guide rail linkage contains many cranks and rod assemblies. They connect a set of six guide rails with a linear actuator. Each rod assembly is adjustable. You can change the length when it is necessary to get the correct retracted position of the guide rails. The removal and the installation procedures are almost the same for all the rod assemblies.
 C.  The removal and the installation of the remaining linkage components are obvious. The guide rail adjustments that are necessary after replacement of these components are the same as after the replacement of the rod assemblies.
 D.  You must remove the ball-transfer panels and the structural door assembly with the splitter rail from floor at Sta 664 and 1852 (BL 0.0). This is necessary to get to the rod assembly, to lubricate the rod assembly and the fittings, and to adjust the rod assembly. You must also remove these components to do the operational test of the guide rail.
 TASK 25-53-13-004-001
 2.  Guide Rail Rod Assembly Removal (Fig. 401)_______________________________
 A.  Special Tools and Equipment
 (1)  3PRE65B00040 Lower Cargo Door Opening Safety Barrier
 B.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
25-53-15/401, Ball Transfer Panel

 (3)  
52-34-00/001, Forward/Aft Cargo Doors

 (4)  
IPC 25-53-14

 C.  Access
 (1)  Location Zone 121 Forward Cargo Container Compartment Fwd Half, LH 122 Forward Cargo Container Compartment Fwd Half, RH 141 Aft Cargo Container Compartment, LH 142 Aft Cargo Container Compartment, RH
　
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