C.  
You can use the spare seals in the lower bearing of the shock strut for the seal leak repair. Use these spare seals for the first and the second seal replacement. The removal of the inner cylinder or other primary components are not necessary for these seal replacements.

 D.  
After you use up the spare seals, you must disassemble the shock strut for the subsequent seal replacement. You must fully remove the inner cylinder from the outer cylinder. New spare and new seals can then be installed in their lower bearing grooves. Put the MIL-H-5606 fluid on the edge of the replacement seals which have four marks at two location. And put the BMS 3-11 fluid on the replacement seals which has three marks.

 TASK 32-21-02-968-060
 2.  Inner Cylinder Seals Replacement With Spare Seals (Fig. 801)
_________________________________________________
 A.  Special Tools and Equipment
 (1)  
2MIT65B01202 Shock Strut Lower Gland Nut Spanner Wrench

 (2)  
ME65B01221-1 Lower Cam Screw

 (3)  
3MIT65B01202 Shock Strut Lower Bearing Seal Retainer Puller

 (4)  
4MIT65B01221-1 Shock Strut Lower Gland Seals Split Guide

 (5)  
13MIT65B01221-4 Nose Gear Lower Cam Inner Cylinder Wrench

 (6)  
21MIT65B01211-1 Gland Seating Tool

 (7)  
747NLG-1100 Compression Strap; Flex-e-on, Inc., 30600 Solon Industrial Parkway, Solon, Ohio 44139 (Fig. 803)

 (8)  
747NLG-1200 Seal Guide Ring; Flex-e-on, Inc., 30600 Solon Industrial Parkway, Solon, Ohio 44139 (Fig. 803)

 (9)  
747NLG-1300 Installation Ram; Flex-e-on, Inc., 30600 Solon Industrial Parkway, Solon, Ohio 44139 (Fig. 803)

 B.  
Standard Tools and Equipment

 (1)  
Plastic tool for cutting T-ring (commercially available)

 (2)  
Drip tray with 10-gallon minimum capacity (commercially available)

 (3)  
Cloth padding for inner cylinder surface protection

 (4)  
Grease gun (commercially available)

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 32-21-02
 ALL  ú ú 02A Page 801 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL 
SEE  A  SHUTOFF VALVE 
B  SEE A  B  AIR VALVE  SHOCK STRUT PRESSURE SWITCH HYDRAULIC TUBE 
B  A 

A
OIL VALVE (CHECK VALVE)
FWD
B
Shock Strut for the Nose Landing Gear Figure 801 (Sheet 1)
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 32-21-02
 ALL  ú ú 01A Page 802 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

OIL VALVE CENTERING CAM
ACTIVE DYNAMIC SEAL
11.  BACKUP RINGS
SEE
C ACTIVE STATIC SEAL
A-A
3.  SPARE STATIC SEALS DYNAMIC SEALS
12.
14.  SCRAPER RING
CYLINDER
BACKUP RING
OR PISTON

13.
(BLACK NYLATRON) (EXAMPLE)
CYLINDER

(EXAMPLE)
B-B
LOWER CENTERINGBACKUP RING CAM(WHITE TEFLON) NOTE
(EXAMPLE) POSITION

CAM KEYOF RADIUS
BACKUP RING (BLACK NYLATRON) RIVET
(EXAMPLE)
ACTIVE DYNAMIC SEAL AND DUAL
CAM KEY
BACKUP RING INSTALLATION
SHELF

LOWER CENTERING CAM

Shock Strut for the Nose Landing Gear
Figure 801 (Sheet 2)

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 32-21-02
 ALL  ú ú 01A Page 803 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

A
A
WASHER
"A" LOWER BEARING
"B"
GLAND NUT
A-A
Seal Replacement Tools for the Shock Strut Figure 802 (Sheet 1)
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