757 MAINTENANCE MANUAL
 (2)  Access Panels
 197KL Central Hydraulic Service Center

 E. Install the Return Filter Module (Fig. 401)
 S 424-013
 (1)  
Put the return filter module in position.

 S 424-014

 (2)  
Install the three bolts and washers which attach the return filter module to the support bracket.

 S 644-015

 (3)  
Lubricate the O-rings and the fitting threads with hydraulic system lubricant or hydraulic fluid.

 S 434-016

 (4)  
Connect and tighten the hydraulic lines to the return filter module.

 F. Install the Filter Element (Fig. 401)
 S 164-017
 (1)  
Clean the filter element case.

 S 644-018

 (2)  
Apply hydraulic system lubricant or hydraulic fluid to the new O-rings and the threads on the filter element case.

 S 434-019

 (3)
Assemble the filter element, the O-rings, and the filter case.

 S 424-020

 (4)  
Install the filter element and case assembly into the return filter module.

 (5)  
Tighten the filter element case to 20-25 pound-feet.

 (6)  
Safety the filter element case with a lockwire.

 S 434-021
 S 434-022
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 29-11-13
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 G. Install the Return Filter Module Components (Fig. 401)
 NOTE: The steps which follow are applicable to the check valves, the
____ relief valve, the differential pressure indicator, and the ground service connector.
 S 644-023
 (1)  
Apply hydraulic system lubricant or hydraulic fluid to the O-rings, the backup rings and the threads on the component.

 S 434-024

 (2)  
Install the new O-rings and backup rings on the component, if it is applicable.

 S 434-025

 (3)  
Remove the plug from the opening in the return filter module.

 S 434-026

 (4)  
Install the component in the return filter module and tighten as follows:

 (a)  
Tighten the check valves to 35-40 pound-feet.

 (b)  
Tighten the relief valve to 60-75 pound-feet.

 (c)  
Tighten the differential pressure indicator to 15-20 pound-feet.

 (d)  
　
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