ANTISKID SHUTTLE VALVE
MODULE COMPONENTS

C

Antiskid Shuttle Valve Module/Component Installation
Figure 401 (Sheet 2)

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 S 864-047
 (6)  
Remove the pressure from the right and left hydraulic systems and reservoirs (Ref 29-11-00).

 S 864-048

 (7)  
Push in the brake pedals seven times to release the pressure from the brake accumulator.

 TASK 32-42-07-024-061
 3.  Antiskid Shuttle Valve Module - Removal (Fig. 401)_______________________________________
 A. Procedure
 S 944-001
 (1)  
Do the Prepare for Removal procedure (Ref par. 2).

 S 034-002

 (2)  
Disconnect the hydraulic lines from the module and install caps on the lines.

 S 024-003

 (3)  
Remove the module attach bolts and remove the module.

 S 034-004

 (4)  
Remove the hydraulic fittings (four locations) from the ports for the brake hydraulic lines on the module and discard the O-rings.

 S 034-005

 (5)  
Remove the hydraulic fittings (six locations) from the ports on the module for the hydraulic lines that connect to the normal and alternate antiskid valves.

 TASK 32-42-07-404-006
 4.  Antiskid Shuttle Valve Module - Installation (Fig. 401)____________________________________________
 A. Consumable Materials
 (1)  
D00153 Hydraulic Fluid - BMS 3-11

 B.
References

 (1)
29-11-00/201, Pressurize/Depressurize Main Hydraulic Systems

 C.
Access

 (1)  
Location Zones
 143 Left Main Landing Gear Wheel Well
 144 Right Main Landing Gear Wheel Well

 D.
Procedure

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MAINTENANCE MANUAL

 S 644-066
 CAUTION:_______ IF YOU INSTALL ANTISKID SHUTTLE VALVE MODULE PART NUMBER
 2-8051-1 OR 2-8051-1MOD AS A SPARE OR TO PREVENT A FLUID
 TRANSFER OCCURANCE, IT IS RECOMMENDED THAT THE VALVE MODULE ON
 THE OPPOSITE WING BE THE SAME PART NUMBER.  THE 2-8051-1 OR
 2-8051-1MOD MODULES ARE DESIGNED TO DECREASE OR PREVENT RIGHT
 TO CENTER SYSTEM HYDRAULIC FLUID TRANSFER.  IF THE 2-8051-1 OR
 2-8051-1MOD VALVE MODULE IS MIXED WITH A 2-7460-3 OR 2-7460-4

 VALVE, FLUID TRANSFER CAN OCCUR.
 (1)  
Lubricate the O-rings and the hydraulic fittings before you install them in the module.

 S 434-008

 (2)  
Install the hydraulic fittings (four locations) to the brake ports on the module with new O-rings.

 S 434-009

 (3)  
Install the hydraulic unions (six locations) in the ports for the hydraulic lines that connect to the antiskid valve with new O-rings.

 S 424-010

 (4)  
Install the module with four bolts, washers and nuts (four locations).

 S 424-063

 (5)  
Connect the hydraulic lines to the module.

 S 864-013

 (6)  
Pressurize the right hydraulic system and reservoir (Ref 29-11-00).

 S 864-014

 (7)  
Push in the brake pedals fully four or more times.

 S 794-015

 (8)  
After five minutes, do a check for leaks at the hydraulic tube connections

 S 714-016

 (9)  
Do a test to make sure that the module operates properly as follows:

 (a)  
Push in and release the brake pedals and look to make sure that the brake wear pins for each of the four brakes extend and retract.

 NOTE: This check is to make sure that brake pressure is
____ applied through the module to operate the brakes on the side of the airplane for the module that you replaced.
 

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757 MAINTENANCE MANUAL
 (b)  
Remove the pressure from the right hydraulic system (Ref 29-11-00).

 (c)  
Pressurize the left hydraulic system and reservoir (Ref 29-11-00).

 (d)  
Push in the brake pedals fully again and look at the brakes to make sure that the brake on each of the four wheels operates.
　
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