757
MAINTENANCE MANUAL

 (2)  
Access Panel
 197KL Central Hydraulic Service Center

 E.
Install the Filter Module (Fig. 401)

 S 644-013
 (1)  
Apply hydraulic lubricant or hydraulic fluid to the O-rings and the union threads.

 S 434-014

 (2)  
Install new O-rings on the unions.

 S 434-015

 (3)  
Install the unions in the filter module ports.

 S 424-016

 (4)  
Put the filter module on the mounting bracket.

 S 434-017

 (5)  
Put the washers on the mount bolts with the countersunk side of the washer pointed in the direction of the bolt head.

 S 434-018

 (6)
Install the mount bolts and tighten them to 72-88 pound-inches.

 S 434-019

 (7)
Remove the caps and connect the inlet and outlet hydraulic lines.

 F.
Install the Filter Element (Fig. 401).

 S 644-020
 (1)  
Apply hydraulic lubricant or hydraulic fluid to the O-rings.

 S 434-021

 (2)  
Install two backup rings and the bowl O-ring in the groove in the filter head.

 S 434-022

 (3)  
Install the element O-ring and the backup ring in the groove in the filter element.

 (4)
Install the filter element on the fitting in the filter head.

 (5)  
Clean and install the filter bowl.

 (6)  
Tighten the filter bowl to 75-100 pound-inches.

 S 424-023
 S 424-024
 S 434-025
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757 MAINTENANCE MANUAL
 G.  Put the Airplane Back to Its Usual Condition S 864-026
 (1)  
Pressurize the reservoir fill system (AMM 12-12-01/301).
 S 214-027

 (2)  
Make sure there are no leaks at the connection points to the filter module.

 S 104-028 CAUTION: QUICKLY CLEAN THE INSTALLATION AREA OF ALL HYDRAULIC FLUID.
_______ HYDRAULIC FLUID CAN CAUSE DAMAGE TO THE AIRPLANE EQUIPMENT.
 (3)  
Clean all hydraulic fluid from the installation area
 (AMM 12-25-01/301).

 S 414-029

 (4)  
Close the access door for the hydraulic service bay, 197KL
 (AMM 06-41-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-18-04
 ALL  ú ú 01 Page 405 ú May 28/99
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A

757 MAINTENANCE MANUAL
 RAM AIR TURBINE (RAT) SYSTEM - DESCRIPTION AND OPERATION
________________________________________________________
 1.  General (Fig. 1)_______
 A.  The ram air turbine (RAT) provides reserve hydraulic power to the center system for operation of the flight controls. The RAT is stowed in the aft right wing/body fairing. When deployed, the RAT swings out into the airstream and remains extended until retracted on the ground. The RAT deploys if power is lost in both engines. The RAT can be deployed manually with the RAT deployment switch in the flight compartment.
　
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