(s)
Do a check on all the interface dimensions that are common to the trunnion pins, trunnion bearings and the outer cylinder.
(t)
Replace the parts, which show signs of wear.
(u)
If it is necessary, replace the bushings in the shock strut inner cylinder and the steering collar, which are common to the inner cylinder.
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32-21-0 Page 604 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/90
(4) Restore Airplane to Normal
(a)
Remove wooden 2 x 6 and dial indicator platform.
(b)
Remove nose gear steering actuator rod clamps.
(c)
Remove axle jack and inflate shock strut to 237 psi with shock strut fully extended.
(d)
Lower airplane and remove jacks.
500 Nose Landing Gear Torsional Free Play Inspection
Oct 20/90 Figure 601 32-21-0
Page 605/606
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
NOSE 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 one O-ring 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 and installing spare seals are given in paragraphs 2 and 3 respectively. Prepare shock strut for either seal replacement procedure per paragraph 2.B.
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 - MIL-H-5606 or MIL-H-6083 for servicing nose gear shock strut
(2)
Dry air or nitrogen bottle capable of 1800 psi for servicing nose gear shock strut
(3)
Ground Lock Assemblies - (Ref 32-00-01)
(4)
Pin Spanner Adapter Assembly - F80013-1
(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 - V V-P-236 (Ref 20-30-21)
(9)
Split Ring Cam Seal - S13068-339
(10)
Drip tray
(11)
Torque wrench, one-half inch drive, calibrated in pound-feet
(12)
Solvent - TT-T-528 (Toluene) (Ref 20-30-31)
(13)
Primer - Dow Corning RTV 1200 (Ref 20-30-11)
(14)
Semco sealant gun
(15)
Solvent - TT-I-735, Isopropyl Alcohol (15% to 20% solution) (Ref 20-30-31)
(16)
Propyethylene squirt bottle for dispensing alcohol-distilled water solution
(17)
Sealant - Dow Corning QC-7063, GE RTV-174 or GE RTV-1502 (Ref 20-30-11)
(18)
Wooden or plastic spatula for removing old and applying new sealant
(19)
Two wooden blocks of equal dimensions for jacking lower bearing into outer cylinder
(20)
Small brush for applying primer
(21)
Clean pieces of white cloth, new or laundered, containing less than 0.75% oil (carbon tetrachloride extraction) and free of silicone
(22)
Cloth padding for protection of gland nut damage to shock strut, when unscrewed
(23)
Crow - foot wrench
510
May 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-21-11 Page 801
(24) Corrosion Preventive Compound MIL-C-11796, Class 3 (Ref 20-30-21) B Prepare for Seal Replacement
(1)
Check that ground lock assemblies are installed on all landing gear (Ref 32-00-01).
(2)
Jack nose of airplane until shock strut is extended about ten inches.
(Ref. Chapter 7 Jacking)
(3)
Deflate shock strut (Ref 12-15-31) by removing valve cap from charging valve at top of shock strut. Loosen outer hexnut two turns maximum.
WARNING: DO NOT LOOSEN VALVE BODY UNLESS SHOCK STRUT IS COMPLETELY DEFLATED. AIR PRESSURE CAN BLOW VALVE BODY OUT, CAUSING BODILY INJURY TO PERSONNEL.
CHARGING VALVE MUST REMAIN OPEN. INTERNAL PRESSURE CAN BLOW OUT LOOSENED GLAND NUT AND INJURE PERSONNEL.
500
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