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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 038-044
(2)
Remove the truck pivot lockbolt, the nut, and the washer.
(a)
Move the axle jacks until the pivot bolt is free.
(b)
Remove the pivot bolt, the nut and the washer.
S 588-045
(3)
Lift the airplane or lower the truck into a pit.
(a)
Do that until the inner cylinder yoke is clear of the truck beam (AMM 07-11-01/201).
S 428-046
(4) Install the replacement 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: THE SEALS MUST BE RESISTANT TO THE TYPE OF FLUID SHOWN ON
_______ THE SHOCK STRUT NAMEPLATE. THE INCORRECT TYPE OF FLUID CAN CAUSE SEAL DETERIORATION AND FLUID CONTAMINATION.
(a)
Soak three sets of the replacement seals in the applicable hydraulic fluid.
(b)
Rub the outer edges of the inner cylinder yoke (Fig. 801) with the applicable hydraulic fluid.
CAUTION: USE PRECAUTION TO EXTEND THE SEALS TO GO THROUGH THE YOKE.
_______ MAKE SURE ALL SHARP EDGES ON THE STRUCTURE DO NOT CAUSE DAMAGE TO SEALS.
(c) Move three sets of seals up through the yoke. 1) Each set have one dynamic (smaller diameter) seal and one
static (larger diameter) seal. 2) The smaller seal in each set goes above the larger seal.
S 438-047
(5)
Install the truck pivot bolt.
(a)
Lower the airplane or lift the truck.
(b)
Do that until the inner cylinder yoke and the pivot holes for the truck beam align.
(c)
Use the axle jacks to help to align holes.
(d)
Lightly lubricate the pivot holes and the shank of the pivot bolt (Fig. 804).
(e)
Put the thread protector on the pivot bolt and install the bolt.
NOTE: Make sure the head of the pivot bolt is on the inboard
____
side of the truck beam.
(f) Remove the thread protector.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(g)
Apply grease to the washer, the threads of the pivot bolt, and the nut.
(h)
Install the washer and the nut on the pivot bolt.
(i)
Use the spanner wrench for the pivot pin nut and tighten nut 760 to 1200 pound-inches.
(j)
Add the lockbolt, the washer, and tighten the self-locking nut.
S 438-048
(6)
Install the brake rods.
(a)
Apply grease to the washer surfaces, the shank, and the threads of the brake rod bolts.
(b)
Install the brake rods with the bolt heads that point out from the beam (Fig. 804).
(c)
Tighten the nuts 144 to 720 pound-inches and install the lockbolt.
S 098-049
(7)
Remove the nylon sling from the inner cylinder fork.
S 038-050
(8)
Remove the lower bearing assembly.
(a)
Put a cloth around the inner cylinder for the shock strut below the gland nut (9) (Fig. 802).
(b)
Remove the lockplate and use the wrench adapter to loosen the gland nut (9).
CAUTION: KEEP THE GLAND NUT AND THE OUTER CYLINDER 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.
(c)
Move the gland nut 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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本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 2(155)
