BRAKE HOUSING BUSHING REMOVAL
C
Axle Sleeve Installation for the Wing Landing GearFigure 401 (Sheet 3)
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747-400 MAINTENANCE MANUAL
S 494-003
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASKS BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 494-004
(3)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
H.
Procedure
S 034-005
(1)
Remove the tire/wheel assembly from the axle (AMM 32-45-01/401).
S 034-006
(2)
Remove the antiskid transducer from the axle (AMM 32-42-04/401).
S 034-008
(3)
Remove the transducer wires from the axle:
(a)
Remove the 4 screws from the pull box cover at the tow fitting.
(b)
Pull the disconnected wires until the connectors are at the pull box.
NOTE: The connectors will not go through the hole in the
____ wheel truck. It is not necessary to fully pull the wires from the wheel truck.
S 034-009
(4) Remove the brake unit (AMM 32-41-15/401).
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747-400
MAINTENANCE MANUAL
S 884-010
(5) Decrease the temperature of the axle for the removal of the brake housing bushing:
NOTE: The cold temperature will decrease the axle diameter.
____ When you subsequently apply heat to the brake housing bushing, the fit between the brake housing bushing and the axle will loosen.
(a) Put a cloth tightly in the axle at the location where the axle engages with the truck beam.
NOTE: The cloth will supply protection for the components in
____ the other end of the axle. When you fill the axle with the dry ice, the cloth will keep the dry ice in the correct end of the axle.
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.
(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 494-011
(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 884-012
(7)
Increase the temperature of the brake housing bushing:
(a)
Install the electrical heat blanket around the brake housing bushing (Fig. 401, View B).
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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
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本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 2(69)
