The ADP filter module and the EDP filter module are interchangeable.
Each module has these components:
*
Pressure filter

*
Case drain filter

*
Automatic filter bowl removal shutoff valve (2)

*
Differential pressure indicator (red pop-up indicator) (2)

*
Check valve (3)

*
Pressure transducer

*
Temperature transducer

*
Relief valve.

The EDP filter modules and the filter module for ADP C2 also have a ground service disconnect.
Location
The filter module for the left system EDP is in the left engine aft strut fairing. The filter module for the right system EDP is in the right engine aft strut fairing.
You get access to these filter modules through the aft strut fairing doors on the left and right sides of each engine strut.
The ADP filter modules are in the left wing to body fairing forward of the ADPs. An access panel permits you to get access to the filter modules.
Functional Description
Hydraulic pressure and case drain flow go through the filters in the filter modules.
A temperature transducer in the case drain line sends temperature signals to the HYDIM cards. A pressure transducer in the pressure line sends pressure signals to the HYDIM cards.
The check valves prevent hydraulic backflow. The check valve in the pressure line also isolates the pressure transducer from system pressure.

EFFECTIVITY BEJ ALL  29-10-00 
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D633W101-BEJ  Sep 05/2002 

MAIN HYDRAULIC SYSTEMS -ADP AND EDP PRESSURE AND CASE DRAIN FILTER MODULES

The relief valve starts to open at 3400 psid to protect the system from over-pressure. Full flow occurs at 4100 psi. The relief valve sends the hydraulic fluid back to the reservoir through the system return lines.
Training Information Point
You can not clean the filters and use them again.

The red differential pressure indicator extends to show a
clogged filter.  Replace  the  filter  and  manually  reset  the 
indicator. 
You  can  pressurize  the  hydraulic system  with  a  ground 

pressure source through the ground service disconnect.

EFFECTIVITY BEJ ALL  29-10-00 
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D633W101-BEJ  Sep 05/2002 

MAIN HYDRAULIC SYSTEMS -ADP AND EDP PRESSURE AND CASE DRAIN FILTER MODULES

EFFECTIVITY BEJ ALL  29-10-00 
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D633W101-BEJ  Sep 05/2002 

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

29-10-00

Page 46 D633W101-BEJ Sep 05/2002

MAIN HYDRAULIC SYSTEMS -RETURN FILTER MODULES

Purpose

The return filter modules remove particles from the hydraulic fluid before the fluid returns to the reservoirs.
Physical Description

The left and right return filter modules are the same. The center return filter module is different than the left and right modules.
Each module has these components:
*
Replaceable filter

*
Automatic filter bowl removal shutoff valve

*
Differential pressure indicator (red pop-up indicator)

*
Check valve (2) (left and right modules only)

*
Bypass relief valve with indicator

*
Ground service disconnect (Left and right modules only).

Location

The return filter module for the left system is in the left engine aft strut fairing. The return filter module for the right system is in the right engine aft strut fairing. You get access to these filter modules through the aft strut fairing doors on the right side of each engine strut.
The center system return filter module is on the keelbeam in the right wheel well.
EFFECTIVITY
BEJ ALL

Functional Description
Return fluid from airplane hydraulic systems and the heat exchangers goes through the return filter modules before it goes into the hydraulic reservoirs again.
The left and right return filter modules have a negative pressure loop.
The negative pressure loop and the check valves permit backwards flow of fluid from the reservoir to the system without backflush of the filter.
The center hydraulic system has a negative pressure loop outside the return filter module.
Bypass relief valves open to permit continued hydraulic flow if the filter clogs. The relief valve starts to open at approximately 165 psid.
Training Information Point
You can not clean the filters and use them again.
The red differential pressure indicator extends if the pressure difference across the filter is 48 -62 psi. This shows a clogged filter. Replace the filter and manually reset the indicator.
　
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