(18)
Slide gland nut (8) into position to screw onto outer cylinder.
NOTE: If trouble is experienced in moving lower bearing into outer cylinder, align inner cylinder and place a wooden block of equal dimensions on each side of inner cylinder, below gland nut, and jack inner cylinder until gland nut reaches outer cylinder.
500
32-21-11 Page 804 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/85
501 Nose Gear Shock Strut Seal Replacement
Aug 15/71 Figure 801 32-21-11
Page 805
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(19)
Apply corrosion preventive compound to thread area on gland nut and outer cylinder.
(20)
Screw shock strut gland nut on outer cylinder and tighten to 75-100 pound-feet torque then back off nut to align nearest slot for lock.
(21)
Install gland nut lock.
(22)
Check that torsion link lugs on inner cylinder are opposite outer cylinder drag brace lug.
(23)
Check that the length of the fully extended gear is 24.0 inches as indicated on nose gear servicing chart (Ref 12-15-41, Servicing).
(24)
Clean area for new sealant fillet using a new or laundered white cloth and toluene.
(25)
Apply thin brush coat of primer to seal area of gland nut and allow a minimum of 1/2-hour drying time before applying sealant.
(26)
Apply sealant fillet.
(a)
Apply bead of sealant around shock strut outer cylinder and gland nut with sealant gun.
(b)
Work fillet onto surface with spatula or sealant gun tip. Minimize air bubbles as much as possible when forming fillet.
NOTE: A solution of 15 to 20% isopropyl alcohol in distilled water may be applied to the tool, used to form fillet, to prevent sealant from sticking to the tool. The water alcohol solution is to be kept free of contamination by dispensing it from polyethylene squirt bottles.
(c)
Form fillet a minimum of 0.08 inch thick at the junction of gland nut and shock strut surfaces extending 1/8 to 1/4 inch out on gland nut surface and up shock strut surface.
NOTE: A surface skin forms on the sealant a few minutes after it is exposed so forming of fillet must be done immediately after sealant is applied.
D. Restore Airplane to Normal Configuration.
(1)
Lower jack under nose gear axle and remove jack.
(2)
On airplanes with nose gear taxi light, connect taxi light electrical harness and lockwire the plug with lockwire using double twist method and install clamps on wiring harness at points where disconnected.
(3)
Wipe exposed inner cylinder with hydraulic fluid.
(4)
Service shock strut first with hydraulic fluid then dry air or nitrogen per decal on nose gear shock strut (Ref Chapter 12).
(5)
Lower nose of airplane and check for leaks at gland nut.
(6)
Remove airplane jacks.
(7)
Tag strut to show status of spare seals, either, "static spare seal used," or, "both dynamic seals used."
500
32-21-11 Page 806 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/86
500 Shock Strut Seal Arrangement
Aug 15/71 Figure 802 32-21-11
Page 807
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Replace Active Inner Cylinder Seals and Install Spare Seals
A. Equipment and Materials
(1) Same as that listed in par. 2.A. except add the following:
(a)
Orifice Tube Extension Tool - F80160-1 or SE32-1102
(b)
Hard wood strip (1 x 3 - 19-1/8 inches)
(c)
Clamp - Nose steering and piston position cables, F80161-1 or F80161-10 (2)
(d)
Ring Compressor - C32002-1
B. Prepare for Seal Replacement
(1)
Perform steps in par. 2.B.
(2)
Remove nose gear wheel well doors (Ref 32-22-11).
C. Replace Active Seals and Install Spare Seals
(1)
Remove lockwire between jamnut on orifice support tube extension and air valve and between the same jamnut and adjacent bolt which holds piston position pulley mount (Fig. 803).
(2)
Remove air valve from orifice support tube extension.
WARNING: CHECK THAT SHOCK STRUT IS COMPLETELY DEFLATED BEFORE BEGINNING TO REMOVE VALVE. FAILURE TO COMPLY CAN CAUSE BODILY INJURY TO PERSONNEL AND DAMAGE TO MATERIAL.
(3)
Remove jamnut and special washer from orifice support tube extension.
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