HYDRAULIC POWER -COMPONENT LOCATIONS

General
Hydraulic system components are in these locations:
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Left and right engine aft strut fairings

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Right wheel well

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Aft wing to body fairings

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Main equipment center

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Stabilizer compartment.

Left and Right Hydraulic Systems

The left and right hydraulic system components are almost the same. Most left system components are in the left engine aft strut fairing. Most right system components are in the right engine aft strut fairing.
The components in each engine aft strut fairing include:
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A hydraulic reservoir

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An alternating current motor pump (ACMP)

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Filter modules (3)

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A reservoir pressurization module.

The left system engine-driven pump (EDP) is on the left engine. The right system EDP is on the right engine.
The system pressure transducers are in the wing structure behind each engine.
Center Hydraulic System
Most center hydraulic system components are in the right wheel well. These components include:
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A hydraulic reservoir

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ACMPs (2)

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Filter modules (3)

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A reservoir pressurization module

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A system pressure transducer

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Isolation valves.

Two air-driven pumps (ADPs) are in the left aft wing to body fairing behind the left wheel well.
The ram air turbine (RAT) is in the right aft wing to body fairing behind the right wheel well.
Other Hydraulic System Components
Four hydraulic interface module (HYDIM) cards are in the cardfiles in the main equipment center.
Heat exchangers are in the left and right main fuel tanks.
Hydraulic ground servicing equipment is in the ground servicing bay. The ground servicing bay is in the right aft wing to body fairing.
Hydraulic accumulators are in the stabilizer compartment.

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777 AIRCRAFT MAINTENANCE MANUAL

HYDRAULIC POWER -COMPONENT LOCATIONS

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777 AIRCRAFT MAINTENANCE MANUAL

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HYDRAULIC POWER -OPERATION

General

You can pressurize the hydraulic systems with a ground service cart or with the hydraulic pumps.
Ground Service Cart Pressurization

The ground pressurization connections for the left system are in the left engine strut.
The ground pressurization connections for the right system are in the right engine strut.
You get access to these connections through the aft strut fairing doors on the right side of each engine strut.
The ground pressurization connections for the center hydraulic system are in the left wing to body fairing behind the left wheel well.
You get access to these connections through the ADP filter module access door.
Hydraulic Pump Pressurization

You use the Hydraulic/RAT panel on the P5 overhead panel to turn on the hydraulic pumps.
EFFECTIVITY
BEJ ALL

Training Information Point
If you pressurize the hydraulic systems with the hydraulic pumps, make sure there is sufficient fuel in the main fuel tanks to cool the heat exchangers. Approximately 709 gallons (2688 liters) (4794 pounds) (2175 kg) of fuel in the left and right main fuel tanks is necessary to cool the heat exchangers in the left and right hydraulic systems. Approximately 1080 gallons (4095 liters) (7303 pounds) (3313 kg) of fuel in the right main tank is necessary to cool the center system heat exchanger.
To pressurize a hydraulic system with a ground service cart, you first need to remove the pressure from the hydraulic reservoir.
The sequence in which you pressurize or remove the pressure from the hydraulic systems can cause fluid to move between the center and right systems. This can cause a high fluid level in one system and a low fluid level in the other system.
If you set the parking brake in one of these conditions:
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The right and center system pressurized

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Only the right pressurized

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No hydraulic system pressurized

and then release the brake with only the center system pressurized, the fluid can move to the center system.
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HYDRAULIC POWER -OPERATION

If you set the parking brake with only the center system pressurized, and then release the brake in one of these conditions:
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