(e)
This will give the clearance for the installation of the lower bearing puller.
CAUTION: CLEAN THE HYDAULIC FLUID FROM THE TIRES IMMEDIATELY IF
_______ THE FLUID ARE ON THE TIRES. THIS WILL PREVENT THE TIRE DETERIORATION.
(f)
Move the scraper ring and the retainer down to the gland nut (9).
(g)
Put a tray below the shock strut to catch the hydraulic fluid.
(h)
Attach the lower bearing puller to the lower bearing (12) with three screws.
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747-400 MAINTENANCE MANUAL
(i)
Attach the sleeve of the puller to the chrome surface of the inner cylinder (13).
(j)
Lift the airplane or lower the inner cylinder (13) until you can get the seal (6).
(k)
Move the lower bearing (12) down to the gland nut (9) at the top of the yoke.
(l)
Continue to lift the airplane or lower the inner cylinder until you get the seal (8).
S 028-052
(9) Remove the used seals (6) and (8).
CAUTION: PUT A PROTECTION STRIP BETWEEN THE SEAL AND THE SURFACE OF
_______ THE INNER CYLINDER WHILE YOU CUT THE SEAL. 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 SEALS WHILE THE SEAL MOVE THROUGH THE NICKS OR SCRATCHES.
(a)
Cut the seals (6) and (8) from around the inner cylinder (13).
(b)
Use the plastic tool to prevent damage to the inner cylinder surfaces.
S 118-053
(10)
Clean the inner cylinder (13) and other parts fully with hydraulic fluid specified on the shock strut nameplate.
S 218-054
(11)
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 all the
____ used backup rings with new backup rings. Use the used backup rings only after a fully inspection and new rings are not available.
(b) Examnine that the scraper rings are serviceable.
S 428-055
(12)
Install the new active seals.
(a)
Carefully move the seal (8) (smaller diameter seal) up through the seal groove.
(b)
Carefully move into the recess in the top of the lower bearing.
(c)
Use the blunt nonmetallic tool if it is necessary.
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747-400 MAINTENANCE MANUAL
(d)
Put the seal (8) fully in the recess.
(e)
Examine that the seal is not twisted.
(f)
Apply a light layer of hydraulic assembly lubricant if it is necessary.
(g)
Move the seal (6) (larger diameter seal) up into the outer groove of the lower bearing.
(h)
Move one set of the lubricated spare seals into each groove in the inner cylinder.
S 438-057
(13)
Install the lower bearing assembly.
(a)
Put the gland nut (9), the scraper ring and the lower
bearing (12) on top of each other.
(b)
Measure the height and get the dimension as the dimension A (Fig. 802).
CAUTION: KEEP THIS TOOL IN ITS POSITION WHILE YOU INSTALL THE
_______
PARTS. THIS WILL PREVENT DAMAGE TO SEALS.
(c)
Lubricate the seal split guide tool with applicable hydraulic fluid.
(d)
Move the assembled parts up into the outer cylinder (2) as much as possible by hand.
(e)
Lubricate the inner surfaces of the gland seating tool.
(f)
Put the tool halves 180 degrees apart on the inner cylinder (13).
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