747-400 AMM 飞机维护手册 起落架 LANDING GEAR 3(122)

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 6)  Hit the lower bearing up into the outer cylinder through the split guide.
 7)  There will be more resistance while the seal goes into the split guide.
 8)  After the seal fully goes through the split guide and into the outer cylinder, stop to hit the bearing.
 9)  Remove the split guide.
 10) Continue to hit the bearing until you install the bearing as far as the ram permits.
 11) Remove the installation ram.
Use the gland seating tool to install the bearing.
 1)  Apply force to the gland seating tool to put the assembled parts into the outer cylinder.
 2)  Lubricate the inner surfaces of the gland seating tool.
 3)  Set the tool halves 180 degrees apart on the inner cylinder (13).
 4)  Use the jack to lift the truck symmetrical until the gland nut (9) on the yoke touches the seating tool.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WARNING:_______ DO NOT APPLY UNWANTED FORCE WITH THE JACKS.  THIS
 WILL CAUSE DAMAGE TO THE YOKE, THE GLAND NUT AND THE
 SEATING TOOL.  IT ALSO CAN CAUSE INJURY TO PERSONS.

 5) Carefully lift the truck.
 6) Carefully push the assembled parts into the outer cylinder

 (2) until the parts move into the outer cylinder (2). 7) During the jack, make sure it moves freely. 8) Make sure not too much force is applied to the seating tool
 through the gland nut (9) and the yoke. 9) Decrease the jack pressure lightly and remove the gland seating tool. 10) Remove the split guide for the lower gland seal from the outer cylinder (2). 11) Move the scraper ring and the gland nut (9) up into the outer cylinder (2).
 (o)  
Remove the lower cam screw if it is there.

 WARNING:_______DO NOT LET YOUR SKIN TOUCH THE MATERIAL. CORROSION INHIBITION MATERIAL CONTAINS FLAMMABLE AND POISONOUS MATERIALS. SPEAK WITH THE MANUFACTURER, FIRE, INDUSTRIAL HYGIENE AND SAFETY ORGANIZATIONS ON THE NECESSARY EQUIPMENT, AND PROCEDURE FOR THIS MATERIAL. FLUSH THE MATERIAL FROM THE SKIN OR FROM THE EYES IMMEDIATELY WITH WATER. PROVIDE MEDICAL AID TO ANY PERSON WITH AN INJURY IMMEDIATELY.

 (p)  
Apply the corrosion inhibition material to the gland nut threads.

 (q)  
Use the wrench adapter to install the gland nut (9) on the outer cylinder (2).

 (r)  
Tighten the gland nut 2100 to 2400 pound-inches.

 (s)  
Loosen to align the nearest nut slot with the lock tab.

 (t)  
Measure the dimension B (Fig. 802).

 (u)  
Do a check that the dimension B is equal to (dimension A minus

 7.495 inches within | 0.045 inches). 1) If the dimension B is more than the limit, disassemble the shock strut.
 2)  Do a check for the twisted seals or the clearance between the parts.
 (v)  
Install the lock tab for the lower gland nut and tighten with the bolt, the washer and the nut (Fig. 802).

 (w)  
Install the check valve (used as drain plug) with the lubricated 0-ring into the outer cylinder (2) and the lockwire.

 (x)  
Tighten the check valve 264 to 300 pound - inches.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01A Page 815 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (y)  
Connect the higher and the lower torsion link if they are disconnected.

 (z)  
After the seal replacement, do a check for positive operation of the nose gear squat switches (AMM 32-09-03/501).

 G.
Put the airplane back to its usual condition.

 S 588-016
 (1)  
Lower the nose gear axle and remove the axle jack
 (AMM 07-11-03/201).

 S 118-017

 (2)  
Apply a thin layer of hydraulic fluid, specified on the shock strut nameplate, on the visible chrome surface of the inner cylinder.

 S 588-018

　
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