5. Install Main Landing Gear
A. With airplane still jacked to same height as on gear removal, prepare a landing gear assembly for installation.
WARNING: USE NITRILE GLOVES FOR SKIN PROTECTION AGAINST BMS 3-27 (MASTINOX 6856K). IF MASTINOX GETS ON YOUR SKIN, IMMEDIATELY REMOVE IT WITH WATER. IF THIS MATERIAL GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER AND GET MEDICAL AID. THIS MATERIAL CONTAINS VERY POISONOUS AND FLAMMABLE AGENTS WHICH CAN CAUSE INJURIES TO PERSONS.
CAUTION: REMOVE UNWANTED MASTINOX FROM SURFACES WHICH WILL BE LUBRICATED. IF YOU APPLY MASTINOX TO JOINTS THAT TURN, FAILURE OF THE LANDING GEAR TO EXTEND OR RETRACT CAN OCCUR.
NOTE: A landing gear assembly includes a shock strut, two brake units, two tire and wheel assemblies, upper and lower torsion links, proximity switch sensors, drag strut, trunnion link, static discharge assemblies, hydraulic lines, electrical harness, and clamps. A teleflex cable for ground spoiler is installed on the right gear.
1.
Parts which are not lubricated with grease after installation must be coated with Mastinox 6856K (Ref 12-21-11/201).
2.
Parts which are lubricated with grease after installation must be lubricated with Aero Shell 07 (Ref 12-21-11/201).
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Page 412A/412B
B. Install aft trunnion bearing in beam.
(1)
Verify exposed surface of bushing in beam is thoroughly clean and apply sealant around periphery of bushing on both fore and aft sides of beam.
(2)
Install bearing in beam from forward side, using care to avoid damage to bearing, bushing, or beam. Note that blank spline on bearing must align with mating spline in bearing retainer (9, Fig. 402) which is attached to aft side of beam. Apply sealant around periphery of bearing OD on both fore and aft sides of beam.
(3)
Install bearing retainer nut (3) and use torque wrench adapter to tighten nut 4500 to 7000 pound-inches lube torque. Apply BMS 3-28 antiseize compound to the threads of the nut prior to installation.
(4)
On airplanes with grease seal, install grease seal (10) on bearing flange (forward side of beam).
C. Support forward end of trunnion link (stage 4, Fig. 407).
D. Run gear under wheel well with torsion links facing forward.
E. Adjust position of gear until main gear wheels are a short distance aft of tire prints marked on ground from original gear assembly.
F. Chock wheels aft.
G. With two or three men, raise shock strut.
H. Secure drag strut to shock strut with line and remove trunnion link.
I. Slowly raise gear, simultaneously rolling gear towards tire prints. Three men should be used to steady gear (stage 3, Fig. 407).
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J. If necessary, lift to extend or bear down to compress shock strut.
K. If lateral adjustment is required, remove chocks and work gear into position by rolling on wheels forward and rearward to give a lateral zig-zag movement.
L. Install thread protector and pin alignment tool in aft trunnion.
M. Align aft trunnion with bearing center and insert trunnion into bearing while lifting and rolling gear towards tire prints until trunnion is seated in bearing.
N. Remove aligning tool, install key (8), washer (7) and fuse nut (6). Tighten fuse nut to a range of 1000 to 1200 pound-inches lube torque as appropriate to align lockbolt holes. Install washers, lockbolt (5) and lockwire.
O. Install bearing retainer lock (2), and retainer nut lockbolts (1) and lockwire.
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