(10)
Remove ground lock assemblies (Ref 32-00-01). Manually release downlock.

(11)
Slowly roll gear inboard until inner cylinder can be removed.

CAUTION:  HAVE EQUIPMENT OR MANPOWER READY TO SUPPORT WEIGHT OF INNER CYLINDER AS CYLINDER COMES OUT.

(12)
On airplanes listed in sheet 1, figure 801, take out retainer ring (18) and remove upper bearing assembly (19).

(13)
Remove snubbing valve (20), spacer (2), and seal adapter (4) from inner cylinder. 

(14)
Remove active static seal O-ring (3) and backup rings (15) from outer groove in seal adapter (4). Use plastic tool to prevent damage to cam.

(15)
Remove active dynamic seal (21) and channel seal, cam seals or backup rings (5) 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. 

(16)
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.

(17)
If installed, slip lubricated channel seal (5) over and down inner cylinder to position around inner cylinder between lower bearing (6) and lower centering cam.

(18)
Carefully stretch and slip new lubricated active dynamic seal (21) over and down inner cylinder and seal adapter to position in channel seal, if installed, or install backup rings or cam seal (sheet 2, Fig. 802).

(19)
Carefully stretch static seal (9) and spare O-rings or seal assembly, (8) necessary to replace missing spares, and slip over and down inner cylinder, seal adapter, and lower bearing into respective recesses in lower bearings. 

(20)
Carefully stretch new lubricated active static seal O-ring (9) only enough to slip over and down inner cylinder into outer groove of seal adapter (4) and install a new backup ring (15) on each side of O-ring (sheet 2, Fig. 801).

(21)
Slide seal adapter over the inner cylinder and down on to washer.

(22)
Slide spacer (2) over inner cylinder with double stepped side down.

(23)
Install snubbing valve (20) with flange up. Add upper bearing (19).

(24)
Check to ensure there is no twist in any of the seals.

(25)
Swing outer cylinder into position to admit insertion of inner cylinder. 

(26)
Slowly roll gear outboard until inner cylinder is inserted.

(27)
Engage main gear downlock and insert ground lock assemblies (Ref 32-00-01).

(28)
Slide lower bearing against newly installed seal and slide bearing and seal adapter as a unit into outer cylinder. 

(29)
Slide scraper adapter (11) with scraper ring (10) into position against lower bearing and install gland nut (12). 

(30)
Slide gland nut (12) into position to screw into outer cylinder.

CAUTION:  GLAND NUT AND OUTER CYLINDER THREADS MAY HAVE BEEN REWORKED (OVERSIZE). IF SO, GLAND NUT AND OUTER CYLINDER SHOULD BE IDENTIFIED ACCORDINGLY AND KEPT AS A SET.

(31)
ON AIRPLANES WITH GLAND NUT THAT HAS LUBE FITTINGS: apply MIL-C-11796, Class 3, corrosion preventive compound to the threads of the gland nut (12) and the outer cylinder (17). ON AIRPLANES WITH GLAND NUT THAT HAS PLUGS: apply BMS 3-27 (Mastinox 6856K) corrosion preventive compound to the threads of the gland nut (12) and the outer cylinder (17).

(32)
Turn inner cylinder until torsion links line up.

(33)
Connect torsion links at apex (Ref 32-11-51, R/I). 

(34)
Install the gland nut (12) on the outer cylinder (17). Tighten the gland nut (12) 50 to 400 pound-feet lube torque.

(a)  Turn the gland nut (12) to the nearest slot to allow the installation of the lockplate (1).

(35)
Measure the distance the gland nut (12) extends below the outer cylinder (17). The dimension must equal the dimension you recorded in step 3.C. (1), within 0.01 inch.

(36)
Measure the full stroke of the inner cylinder (16) by manually compressing and extending it.

500 
32-11-21 Page 808  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/96 

500  Main Landing Gear Shock Strut Replacement 
Aug 01/96  Figure 801 (Sheet 4)  32-11-21 
Page 808A 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500 
Feb 15/80  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-11-21 Page 809 

500 
32-11-21 Page 810  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/80 
　
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