S 414-017
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A
747-400 MAINTENANCE MANUAL
 BRAKING ROLLER - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
The removal of the braking rollers.

 (2)  
The installation of the braking rollers.

 B.  There are 10 braking rollers in the forward cargo compartment; 5 in each roller tray at LBL 32.50 and RBL 32.50. There are 8 braking rollers in the aft cargo compartment; 4 in each roller tray at LBL 32.50 and RBL
 32.50.
 C.  Each braking roller consists of a rubber covered aluminum body and an internal brake system. The roller spins freely in the loading direction but produces a retarding torque of 2.971 +0.371 / -0.00 pound-feet (4.0 +0.5 / -0.00 newton-meters) in the unloading direction.
 TASK 25-53-23-004-001
 2.  Braking Roller Removal (Fig. 401)______________________
 A.  Special Tools and Equipment
 (1)  3PRE65B00040, Lower Cargo Door Opening Safety Barrier
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 52-34-00/001, Forward/Aft Cargo Doors

 (3)  
AMM 25-53-23/401, Transport Roller Installation

 (4)  
AIPC 25-53-16

 C.  Access
 (1)  Location Zone
 100 Lower Half of Fuselage

 D.  Prepare for the Removal
 S 864-002
 (1)  
Supply electrical ground power (AMM 24-22-00/201).

 (2)  
Open the cargo compartment door (AMM 52-34-00/001).

 S 014-003
 S 494-004
 WARNING: BE CAREFUL WHEN YOU ARE NEAR THE OPENING OF THE CARGO
_______ COMPARTMENT DOOR. INSTALL A SAFETY BARRIER (3PRE65B00040) ACROSS THE OPENING OF THE DOOR UNLESS AN ACCESS STAND IS AT THE DOOR. INJURY TO PERSONS CAN OCCUR IF THEY FALL THROUGH THE OPENING OF THE DOOR.
 (3)  Install a safety barrier (3PRE65B00040) across the opening of the cargo compartment door if it is necessary.
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747-400
MAINTENANCE MANUAL

AFT CARGO 
COMPARTMENT 
FORWARD CARGO  SEE  B 
COMPARTMENT 
SEE  A 
BRAKE ROLLER 
AND TRAY 
FORWARD CARGO COMPARTMENT  (10 LOCATIONS)  TRANSPORT 
DOORWAY  SEE  C  ROLLER (REF) 

FWD 
FORWARD CARGO COMPARTMENT 
A 
ROLLER (REF) TRANSPORT  AFT CARGO DOORWAY COMPARTMENT 

CSEE AND TRAY BRAKE ROLLER (8 LOCATIONS)  FWD  B AFT CARGO COMPARTMENT 
Figure 401 (Sheet 1) Braking Roller Installation 

L51751
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747-400
MAINTENANCE MANUAL

BRAKING ROLLER AND TRAY
(EXAMPLE)

Braking Roller Installation
Figure 401 (Sheet 2)

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L51919
A
747-400 MAINTENANCE MANUAL
　
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