4. Install Main Gear Shock Strut
A. Secure main landing gear sling to shock strut assembly (Fig 402).
B. Hook crane onto sling, hoist shock strut and clamp in position on landing gear buildup stand (Fig 403).
C. Connect trunnion link, assemble drag strut segments and torsion links (Ref 32-11-0).
D. Install brakes and wheels (Ref 32-45-11).
E. Add hydraulic lines and electrical wiring to shock strut (Fig. 404).
F. Install main gear oleo lock assembly (Fig. 401).
H79994
549 Shock Strut Air Charging Valve and Oleo Lock Assembly Installation
Feb 20/87 Figure 401 32-11-21
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G. Hoist assembly out of buildup stand.
H. Set gear down and lower trunnion-link-drag strut apex onto wood block on hydraulic floor jack.
I. Install main landing gear per 32-11-0, par. 5.
Main Landing Gear Sling 500
32-11-21 Figure 402 Nov 15/78
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Main Gear Build Up Stand
Nov 15/68 Figure 403 32-11-21
Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Main Gear Hydraulic Lines and Electrical Cables 501
32-11-21 Figure 404 May 15/79
Page 406
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
MAIN GEAR SHOCK STRUT - APPROVED REPAIRS
1. General
A. Spare seals are carried in grooves in the shock strut lower bearing. Two O-rings for dynamic seals in one groove and two O-rings for the static seal in the other groove. The spare seals permit active seals to be replaced without removing the shock strut inner cylinder every time a seal replacement is necessary. When either the spare static seal O-ring or the last spare dynamic seal O-ring is used the next replacement of that respective O-ring will require disassembly of the shock strut. A procedure for replacing active inner cylinder seals with spare seals and another procedure for replacing active inner cylinder seals with spare seals and another procedure for replacing active inner cylinder seals and installing spare seals are given in paragraphs 2 and 3 respectively. Prepare shock strut for either seal replacement procedure per paragraph 2B.
B. A split ring cam seal must be used with a spare dynamic seal O-ring to replace a faulty channel seal.
C. Backup rings are split and can be replaced without removing inner cylinder.
2. Replace Active Inner Cylinder Seals with Spare Seals (Fig. 801).
A. Equipment and Materials
(1)
Hydraulic Oil 0 MIL-H-6083 or MIL-H-5606
(2)
Dry air or nitrogen bottle capable of 2500 psi for servicing shock strut
(3)
Ground Lock Assemblies (Ref 32-00-01)
(4)
Gland nut wrench - F80033-1
(5)
Plastic tool for removing O-rings
(6)
Lockwire (Monel) - MS20995NC32
(7)
Thin strip of metal to be used as backup when cutting seals
(8)
Petrolatum - VV-P-236
(9)
Split ring cam seal
(10)
Drip tray.
(11)
Clean pieces of white cloth, new or laundered, containing less than 0.75% oil (carbon tetrachloride extraction) and free of silicone.
(12)
Cloth padding for protection of gland nut damage to shock strut, when unscrewed.
(13)
Corrosion Preventive Compound MIL-C-11796, Class 3 (Ref 20-30-21)
(14)
Corrosion Preventive Compound - BMS 3-27 (Mastinox 6856K)
510
Oct 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-11-21 Page 801
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