(4)
Install nose gear steering and piston position cable clamps. Clamp cables firmly against face of trunnion outlet nut.
(5)
Disconnect piston position spring cartridge. Remove piston position fitting assembly, and support with cables on pulleys out of path of interference of follow on operations.
(6)
Remove special nut and lockwasher from orifice support tube extension.
(7)
Install orifice support tube extension tool in orifice support tube extension.
(8)
Remove ground lock assembly (Ref 32-00-01).
(9)
Move landing gear control handle to OFF position to release hydraulic pressure from nose gear lock actuator.
(10)
Unlock lock link assembly.
(a)
Wedge a wooden strip, of proper length and sufficient strength, between top of lower drag brace attach lug on shock strut and bottom of lock brace assembly arm with top end of strip as far aft on arm as possible.
NOTE: Forward end of lock brace arm is lower than aft end. When top of wooden strip is tapped forward, strip will raise the hinge point of the lock brace assembly to an overcenter position to unlock the assembly.
(b)
Tap top end of wooden strip forward to unlock lock brace assembly.
(11)
Place cloth padding around shock strut inner cylinder below gland nut (8, Fig. 801) to prevent sharp edges from damaging inner cylinder if nut should accidentally be dropped allowing nut to slide down inner cylinder.
(12)
Place drip tray to catch hydraulic fluid when gland nut is removed.
CAUTION: CLEAN ANY HYDRAULIC FLUID FROM TIRES IMMEDIATELY TO AVOID DETERIORIZATION.
(13)
Remove gland nut lock (18) on aft side of shock strut. Use pin spanner adapter assembly to unscrew gland nut and slide nut to bottom of inner cylinder.
(14)
Remove bolt (10) to disconnect upper and lower torsion links.
(15)
Roll nose gear wheels forward and support inner cylinder until upper orifice support tube is completely withdrawn from outer cylinder. If orifice support tube extension tool installed in step C.(7) does not move down as wheels begin to roll, gently tap projecting end of tool to start movement of support tube.
(16)
Remove existing O-ring and backup rings from the upper orifice support tube extension.
(17)
Coat new O-ring and backup rings with VV-P-236 petrolatum prior to installation on upper orifice support tube extension.
(18)
Install new lubricated O-ring and backup rings in seal recess on support tube extension.
(19)
Remove retainer rings, upper cam, upper bearing, snubber valve, and key from inner cylinder.
(20)
Remove active static seal O-ring (17) and backup rings (1) from outer groove in lower centering cam (2). Use plastic tool to prevent damage to cam.
(21)
Remove active seal (16) and channel seal, cam seals or backup rings (3) from around inner cylinder.
CAUTION: EXTREME CARE MUST BE EXERCISED AS ANY NICKS OR SCRATCHES ON INNER CYLINDER, BESIDES DAMAGE TO INNER CYLINDER, WILL DAMAGE CENTERING CAM AND SEALS AS THEY SLIDE OVER DAMAGED SURFACE OF INNER CYLINDER.
(22)
Coat one each of static seal and active seal and channel seal, cam seal or backup rings with hydraulic fluid and a light coat of petrolatum.
(23)
If installed, slip lubricated channel seal (3) over and down inner cylinder to position around inner cylinder between lower bearing (6) and lower centering cam.
(24)
Carefully stretch and slip new lubricated active seal (16) over and down inner cylinder and lower centering cam to position in channel seal, if installed, or install backup rings or cam seal (Fig. 802).
(25)
Carefully stretch static seal (4) and spare O-rings or seal assembly, (5) necessary to replace missing spares, and slip over and down inner cylinder, lower centering cam, and lower bearing into respective recesses in lower bearings.
(26)
Carefully stretch new lubricated static seal O-ring (4) only enough to slip over and down inner cylinder into outer groove of lower centering cam (2) and install a new backup ring
(1) on each side of O-ring (Fig. 801).
(27)
Assemble upper cam, upper bearing, snubber valve, key, and retainer rings to inner cylinder.
500
32-21-11 Page 808 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 01/95
500 Nose Gear Assembly
Feb 15/80 Figure 803 32-21-11
Page 809
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500
32-21-11 Page 810 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/71
