(a)
Put a cloth around the inner cylinder (13) for the shock strut below the gland nut (9).
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 (9) 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.
(b)
Remove the gland nut lockplate and use the wrench adapter to loosen the gland nut (9).
(c)
Move the gland nut (9) down to the inner cylinder yoke .
(d)
Lift the airplane (or lower the truck into a pit) if it is necessary.
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(e)
Give the clearance to install the puller tool
(AMM 07-11-01/201).
(f)
Move the scraper ring and the retainer down to the gland nut (9).
CAUTION: CLEAN THE HYDRAULIC FLUID IMMEDIATELY FROM THE TIRES IF
_______ THE FLUID ARE ON THE TIRES. THIS WILL PREVENT THE TIRE DETERIORATION.
(g)
Put a tray to catch the hydraulic fluid when you remove the lower bearing (12) and the seal retainer.
(h)
Attach the lower bearing puller to the bearing assembly with three screws.
(i)
Connect the sleeve of the puller to the chrome surface of the inner cylinder (13).
S 588-019
(2)
Lift the airplane or lower the inner cylinder (13) until you can get to the spare seal (6) (AMM 07-11-01/201).
(a)
Move the lower bearing assembly down to the gland nut (9) at the top of the yoke.
(b)
Continue to lift the airplane or lower the inner cylinder (13) until you get sufficient clearance to remove the seal (6).
S 028-021
(3) Remove the seals.
CAUTION: PUT A PROTECTION STRIP BETWEEN THE SEAL AND THE SURFACE OF
_______ THE INNER CYLINDER WHILE YOU CUT THE SEALS. THIS WILL PREVENT THE DAMAGE TO THE SURFACE OF THE INNER CYLINDER. THE NICKS OR THE SCRATCHES ON THE INNER CYLINDER WILL CAUSE DAMAGE TO THE INNER CYLINDER. THEY WILL ALSO CAUSE DAMAGE TO THE SEALS WHILE THE SEALS MOVE THROUGH THE NICKS OR SCRATCHES.
(a)
Remove the used backup rings (7) and (11).
(b)
Cut the seals (6) and (8) from around the inner cylinder (13).
(c)
Use the plastic tool to prevent damage to the inner cylinder surfaces.
S 118-022
(4) Clean all parts fully with hydraulic fluid specified on the shock strut.
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S 218-023
(5)
Examine that all backup rings (7 and 11) are serviceable.
(a)
Replace the backup rings if they have nicked, scratched or damaged.
NOTE: The recommended installation procedure is to replace the
____ used backup rings with new backup rings. Use the used backup rings only after a fully inspection and new rings are not available.
S 428-024
(6) 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 THE 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.
(a)
Apply a layer of applicable hydraulic fluid on the spare replacement seals (3 and 4).
(b)
Rub all open surfaces of the inner cylinder (13), the lower bearing (12) and the seal retainer with hydraulic fluid.
(c)
Lift up the spare seal (4).
(d) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 1(108)
