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 (b)  Fill the inner diameter of the axle with the dry ice.
 NOTE: When the steam from the dry ice almost stops, the axle
____ temperature will be near the temperature of the dry ice (-120°F). This is the recommended condition.
 (c)  Add more dry ice to the inner diameter of the axle before you install the axle sleeve puller.
 NOTE: This will keep the axle at a constant temperature when
____ you apply heat to the brake housing bushing.
 S 494-012
 (6)  
Install the axle sleeve puller on the brake housing bushing.

 (a)  
Do not remove the dry ice from the axle before you install the axle sleeve puller.

 S 884-013
 (7)  
Increase the temperature of the brake housing bushing:

 (a)  
Install the electrical heat blanket around the brake housing bushing.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 406 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 CAUTION:_______ DO NOT PERMIT THE TEMPERATURE OF THE AXLE COMPONENTS TO
 BECOME 300°F FOR MORE THAN 180 MINUTES.  THE MATERIALS FOR
 THE AXLE COMPONENTS CAN BECOME WEAK IF THE THERMAL LOADS
 ARE TOO LARGE.  WEAK AXLE COMPONENTS CAN HAVE A FAILURE

 DURING OPERATION.
 (b)  
Permit the temperature of the brake housing bushing to become approximately 250°F. 1) Use the thermometer to measure the temperature of the brake

 housing bushing. 2) As the temperature of the brake housing bushing increases, slowly and continuously increase the tension on the puller.

 (c)  
When the brake housing bushing starts to move, remove the electrical heat blanket. 1) If the brake housing bushing does not move, add more dry

 ice to the inner diameter of the axle.
 NOTE: You must remove the axle sleeve puller to add more
____ dry ice to the axle.
 S 034-014
 (8)  
Immediately remove the brake housing bushing with the axle sleeve puller before the component temperatures go to the ambient temperature.

 S 034-015

 (9)  
Remove the retention pin for the axle sleeve.

 S 884-016

 (10)
 Decrease the temperature of the axle for the removal of the axle sleeve:

 NOTE: The cold temperature will decrease the axle diameter.
____ When you subsequently apply heat to the axle sleeve, the fit between the axle sleeve and the axle will loosen.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 407 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 WARNING:_______ DO NOT GET THE DRY ICE ON YOUR SKIN.  THE DRY ICE IS
 FROZEN CARBON DIOXIDE AT A TEMPERATURE OF
 APPROXIMATELY -120°F.  THE COLD TEMPERATURE OF THE CARBON

 DIOXIDE CAN CAUSE INJURY TO PERSONS.
 (a)  Fill the inner diameter of the axle with the dry ice.
 NOTE: When the steam from the dry ice almost stops, the axle
____ temperature will be near the temperature of the dry ice (-120°F). This is the recommended condition.
 (b)  Add more dry ice to the inner diameter of the axle before you install the axle sleeve puller.
 NOTE: This will keep the axle at a constant temperature when
____ you apply heat to the axle sleeve.
 S 494-017
 (11)
 Install the axle sleeve puller on the axle sleeve.

 S 884-018

 (12)
 Increase the temperature of the axle sleeve:

 (a)  
Install the electrical heat blanket around the axle sleeve.

 CAUTION: DO NOT PERMIT THE TEMPERATURE OF THE AXLE COMPONENTS TO
_______ BECOME 300°F FOR MORE THAN 180 MINUTES. THE MATERIALS FOR THE AXLE COMPONENTS CAN BECOME WEAK IF THE THERMAL LOADS ARE TOO LARGE. WEAK AXLE COMPONENTS CAN HAVE A FAILURE DURING OPERATION.
 (b)  
Permit the temperature of the axle sleeve to become approximately 250°F. 1) Use the thermometer to measure the temperature of the axle
　
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