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 CAUTION: DO NOT LIFT THE AIRPLANE IF THE GROSS WEIGHT IS MORE THAN
_______ 564,000 POUNDS. MAKE SURE YOU DECREASE THE LOAD ON THE OPPOSITE WING LANDING GEAR. THIS WILL PREVENT THE TOO MUCH LOAD ON THE BODY LANDING GEAR WHERE THE SEAL REPLACEMENT OCCURS.
 (9)  
Add the hydraulic fluid to extend the nose gear and the two body gear at the same time approximately symmetrical.

 (a)  
Lift the aircraft until the chrome surface (approximately 11.5 inches) shows on the inner cylinder for the left wing landing gear.

 (b)  
This will permit the bearing puller installation.

 H.
Procedure

 (1)  
Install the retainer puller for the lower bearing seal.

 S 498-076
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A
747-400
MAINTENANCE MANUAL

 CAUTION: KEEP THE GLAND NUT (9) AND THE OUTER CYLINDER (2) TOGETHER
_______ AS A SET. IF THE OUTER CYLINDER THREADS WERE REWORKED, THE GLAND NUT WOULD BE UNIQUE TO THE OUTER CYLINDER. A DIFFERENT GLAND NUT WILL NOT FIT THE OUTER CYLINDER TIGHTLY AND CAN CAUSE THE LANDING GEAR FAILURE DURING THE OPERATION.
 (a)  
Use the wrench adapter to remove the lockplate and loosen the gland nut (9).

 (b)  
Move the gland nut (9), the scraper ring and the retainer down to the inner cylinder yoke.

 (c)  
Attach the lower bearing puller to the bearing assembly with three rod assemblies.

 (d)  
Attach the sleeve of the puller around the open chrome part of the inner cylinder (13) and tighten.

 (e)  
Install the strap through the inner cylinder fork and tighten to the other pair of blocks on the sleeve.

 S 588-077
 CAUTION:_______LIFT THE AIRPLANE IN THE LEVEL ATTITUDE. DO NOT EXTEND THE STRUTS FULLY. KEEP THE DIMENSION X TO 32.30 INCHES FOR THE BODY LANDING GEAR AS A LIMIT (AMM 12-15-04/301). AND KEEP THE DIMENSION A TO 24.85 INCHES FOR THE NOSE LANDING GEAR AS A LIMIT (AMM 12-15-05/301).
 (2)  
Add the fluid to three shock struts to lift the airplane until you can get (approximately 10 inches) on the lower bearing (12).

 S 038-078

 (3)  
Remove the lower bearing assembly.

 (a)  
Remove the puller tool.

 (b)  
Lower the bearing assembly to the gland nut (9).

 S 028-081
 (4)  
Remove the seals.

 (a)  
Remove the used backup rings (7) and (11).

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747-400
MAINTENANCE MANUAL

 CAUTION: PUT A PROTECTION STRIP BETWEEN THE SEAL AND THE SURFACE OF
_______ THE INNER CYLINDER WHILE YOU CUT THE SEAL. THIS WILL PREVENT DAMAGE TO THE SURFACE OF THE INNER CYLINDER. NICKS AND SCRATCHES ON THE INNER CYLINDER WILL CAUSE DAMAGE TO THE SEALS DURING OPERATION.
 (b)  
Cut the used seal (6) and (8) from around the inner cylinder (13).

 (c)  
Use the plastic tool to prevent damage to the inner cylinder surfaces.

 S 118-082
 (5)  
Clean all parts fully with hydraulic fluid specified shock strut nameplate.

 S 218-083

 (6)  
Examine that the backup rings (7 and 11) are serviceable.

 (a)  
Replace the backup rings if they have nicked, scratched or damaged.

 NOTE: The recommended installation is to replace the used
____ backup rings with new backup rings. Use the used backup rings only after a full inspection and new rings are not available.
 (b)  Examine that the scraper rings are serviceable.
 S 428-084
 (7)  Install the seals.
 CAUTION: USE ONLY THE TYPE OF HYDRAULIC FLUID SHOWN ON THE
_______ SHOCK STRUT NAMEPLATE. DIFFERENT TYPES OF FLUID WILL CAUSE DAMAGE TO SEALS.
 CAUTION: USE THE CORRECT SEAL FOR THE HYDRAULIC FLUID THAT IS
_______ SHOWN ON THE SHOCK STRUT NAMEPLATE. THE INCORRECT SEAL WILL WEAR QUICKLY, AND CAUSE FLUID CONTAMINATION.
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 起落架 LANDING GEAR 1(117)