32-41-03
 ALL  ú ú 01 Page 410 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 644-039
 (6)  
Lubricate the new O-rings, backup rings, adapters and filter fittings:

 (a)  
LEFT VALVE ASSEMBLY (1) Port: BRAKE A: Adapter (29), Nut (28), Backup Ring (26), O-ring (25), O-ring (24) PRESS A: Filter Fitting (23), O-ring (16), Backup Ring (14), O-ring (13) BRAKE B: Adapter (31), O-ring (24), O-ring (25), Nut (28), Backup Ring (26) PRESS B: Filter Fitting (23), O-ring (13), Backup Ring (14), Nut (15) PRESS C: Adapter (18), O-ring (19), O-ring (20), Nut (21), Backup Ring (22) RET A: Adapter (17), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)

 RET B:  Adapter (12), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)

 (b)  
RIGHT VALVE ASSEMBLY (2)

 Port: BRAKE A: Adapter (29), Nut (27), Backup Ring (26), O-ring (25), O-ring (24) PRESS A: Filter Fitting (23), O-ring (16), Backup Ring (14), O-ring (13) BRAKE B: Adapter (30), O-ring (24), O-ring (25), Backup Ring (26) PRESS B: Filter Fitting (23), O-ring (13), Backup Ring (14), Nut (15) PRESS C: Adapter (18), O-ring (19), O-ring (20), Nut (21), Backup Ring (22) RET A: Adapter (17), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16) RET B: Adapter (12), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)
 S 434-042
 (7)  Install the O-rings and backup rings on the adapters and fittings.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-03
 ALL  ú ú 03 Page 411 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 434-021
 (8)  
Loosely install these parts on the valve assembly:

 (a)  
LEFT VALVE ASSEMBLY (1) Port: BRAKE A: Adapter (29), Nut (28), Backup Ring (26), O-ring (25), O-ring (24) PRESS A: Filter Fitting (23), O-ring (16), Backup Ring (14), O-ring (13) BRAKE B: Adapter (31), O-ring (24), O-ring (25), Nut (28), Backup Ring (26) PRESS B: Filter Fitting (23), O-ring (13), Backup Ring (14), Nut (15) PRESS C: Adapter (18), O-ring (19), O-ring (20), Nut (21), Backup Ring (22) RET A: Adapter (17), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)

 RET B:  Adapter (12), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)

 (b)  
RIGHT VALVE ASSEMBLY (2) Port: BRAKE A: Adapter (29), Nut (27), Backup Ring (26), O-ring (25), O-ring (24) PRESS A: Filter Fitting (23), O-ring (16), Backup Ring (14), O-ring (13) BRAKE B: Adapter (30), O-ring (24), O-ring (25), Backup Ring (26) PRESS B: Filter Fitting (23), O-ring (13), Backup Ring (14), Nut (15) PRESS C: Adapter (18), O-ring (19), O-ring (20), Nut (21), Backup Ring (22) RET A: Adapter (17), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)

 RET B:  Adapter (12), O-ring (13), Backup Ring (14), Nut (15), O-Ring (16)
 S 434-060
 CAUTION:  CAREFULLY HOLD ONLY THE COMPONENT OF THE VALVE ASSEMBLY THAT
_______ CONTAINS THE NUT OR FITTING YOU TIGHTEN. IF YOU PUT A LOAD ON THE MATING SURFACES OF THE COMPONENTS OF THE VALVE ASSEMBLY, YOU CAN CAUSE DAMAGE.
 (9)  
Tighten the nuts and fittings.

 (a)  
Move the adapters that have angles to the positions that they had before you removed them.

 (b)  
Tighten the nuts and fittings: 1) Tighten the filter fittings at the A and B pressure ports to 360 +/-18 pound-inches. 2) Tighten the nuts at the A and B return ports to 360 +/-18 pound inches.

 3)  Tighten the nuts at the A and B brake ports to 280 +/-14 pound-inches.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 4)  Tighten the nut at the C pressure port to 110 +/-5.5 pound-inches.
 S 614-052
 (10)
 Fill the metering valve with hydraulic fluid.

 S 494-051

 (11)
 Put caps on the adapters and fittings.

 G.  
Install the Valve Assembly (1 left, 2 right).
　
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