747-400 AMM 飞机维护手册 起落架 LANDING GEAR 2(32)

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 S 034-028
 (5)  Remove the lower pins (3) from the bearing housing (1) and the airplane structure if it is installed.
 NOTE: Move the inboard pin out after the removal of the lockbolts
____ (4). Use the puller to remove the outboard pin.
 S 424-029
 (6)  Lift the trunnion fork (7) that attaches with the retaining nut (6) and the bearing (5) into its position.
 NOTE: The clevis must be above and aft of the trunnion attach lugs.
____
 S 434-030
 (7)  Turn the bearing housing (1) up and out from the airplane structure while it is on the two pins (2).
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747-400 MAINTENANCE MANUAL
 S 434-031
 (8)  The bearing outer race (5) has slots which connect with the lugs on the housing (1).
 NOTE: Set the bearing on the trunnion fork (7) until the slots and
____
 the lugs can connect.

 S 424-032
 (9)  
Put the bearing into the housing.

 (a)  
Remove the lockwire or tape approximately half the distance in and move the bearing fully into its position.

 NOTE: Make sure you put the bearing slots in the lugs
____ before you turn the housing (1) back into its position.
 S 644-033
 (10)
 Lubricate the threads of the bearing retaining nut (6).

 S 434-034

 (11)
 Install the retaining nut (6) into its position.

 (a)  
Remove any grease from the exposed threads.

 (b)  
Apply a layer of Mastinox 6856K to the threads of the bearing retaining nut (6).

 NOTE: Do not let the sealant touch the bearing.
____
 S 644-035
 (12)
 Lubricate the washer (19) surfaces, the shanks and the threads of the bolts (14) with grease.

 (13)
 Turn the trunnion fork (7) down.

 S 434-036
 NOTE: Adjust the gear with the dolly until the trunnion lugs and
____
 the trunnion fork are aligned.

 S 434-037
 (14) Use the thread protector to install the trunnion fork bolts (14), the washers and the nuts in the trunnion joint.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 434-038
 (15) Tighten the nuts (20) 540 to 660 pound-inches.
 NOTE: Add the lockbolts, the washers and the self-locking nuts.
____
 Tighten the self-locking nuts.

 S 094-039
 (16)
 Remove the trunnion fork sling and the hoist.

 S 434-040

 (17)
 Use the dolly to adjust the gear if it is necessary.

 NOTE: Align the lower holes in the bearing housing (1) and the
____
 structure.

 S 644-041
 (18)
 Put grease on the housing pins (3) and the lockbolts (4).

 S 434-069

 (19)
 Install the pins (3) and the lockbolts (4).

 S 434-042

 (20)
 Install the shim (8) on the outboard side between the structure and the housing.

 NOTE: Use the shim which will give the least clearance, 0.000 to
____ 0.015 inches.
 S 824-043
 (21) Loosen the strap for the drag brace (17) and lower the drag brace until the holes align with the lugs on the trunnion fork (7).
 NOTE: Move the gear with the dolly to align if it is
____
 necessary.

 S 644-044
 (22)
 Lubricate the drag brace bolt (11), the washer and the nut with grease.

 S 434-045

 (23)
 Use the thread protector to install the assembly for the drag brace bolt (11, 12, and 13) from the inboard side.

 (a)  
Tighten the nut (24) 600 to 900 pound-inches and install the lockbolt (23).

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