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 S 644-003
 CAUTION:_______REPLACE USED O-RINGS WITH NEW O-RINGS. USED O-RINGS CAN CAUSE LEAKAGE.
 (2)  Lubricate the O-ring with a thin layer of the fluid used with the component or system.
 S 434-004
 CAUTION: DO NOT MAKE THE ELASTOMERIC O-RING INNER DIAMETERS LARGER BY
_______ MORE THAN 50% DURING INSTALLATION. DO NOT MAKE THE TEFLON AND PLASTIC O-RING INNER DIAMETERS LARGER BY MORE THAN 5% DURING INSTALLATION. FAILURE CAN OCCUR.
 (3)  
Put the thimble over the fitting.

 S 424-005

 (4)  
Put the O-ring on the thimble.

 S 424-006

 (5)  
Move the expanding body over the thimble and against the O-ring, then push the O-ring into the groove.

 S 034-007

 (6)  
Use the extracting rod to remove the expanding body from the thimble.

 S 034-008

 (7)  
Remove the thimble.

 S 214-009
 CAUTION:_______DO NOT PINCH THE O-RINGS. MAKE SURE ATTACHED BOLTS ARE CORRECTLY TIGHTENED. FAILURE CAN OCCUR.
 (8)  Examine the O-ring for twists and pinches caused by installation.
 (a)  Make sure you align the O-ring with no twists before you close the gland.
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747-400
MAINTENANCE MANUAL

O-Ring Installation Tool
Figure 401

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747-400 MAINTENANCE MANUAL
 RECESSED BOSS SEAL FITTINGS - REMOVAL/INSTALLATION
__________________________________________________
 1.  General
_______
 A.  This procedure contains three tasks. The first task is the removal of the fittings. The second task is installation of straight (style E) fittings. The third task is installation of elbow (style S) fittings.
 TASK 20-11-21-004-001
 2.  Recessed Boss Seal Fittings - Removal (Fig. 401)
_____________________________________
 A.  Procedure
 S 034-002
 (1)
Disconnect the hose or the tube from the fitting.

 S 034-003

 (2)
Loosen the jamnut if it is installed.

 S 024-004

 (3)
Remove the fitting from the boss.

 TASK 20-11-21-404-005
 3.  Recessed Boss Seal Fittings-Straight (Style E) - Installation (Fig. 401)
_____________________________________________________________
 A.  References
 (1) AMM 20-51-01/201, Standard Torque Values
 B.  Procedure
 NOTE: Use a lubricant on the O-ring which is applicable for the O-ring
____
 material.

 S 434-006
 (1)
Lubricate the new NAS1611 O-ring and backup ring.

 (2)
Install the O-ring and backup ring in the fitting grooves.

 (3)
Lubricate the new NAS1612 O-ring.

 S 424-017
 S 434-007
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A

747-400
MAINTENANCE MANUAL

 

 

BOSS
O-RING

YOU CAN USE A 45` OR 90` ELBOW JAMNUTS NAS 1410 DD, OR AN6298 WITH BACKUP RING MS28773 ARE OPTIONAL USE ONLY PHOSPHATE ESTER FLUIDS WITH NAS 1611 AND
NAS 1612 O-RINGS
Recessed Boss Seal Fitting Installation
Figure 401

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