Figure 302

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747-400 MAINTENANCE MANUAL
 HYDRAULIC SYSTEMS - SERVICING (HYDRAULIC REPLENISHING)
______________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
Hydraulic Reservoir Servicing (Manual Fill Procedure)

 (2)  
Hydraulic Reservoir Servicing (Pressure Fill Procedure)

 (3)  
A procedure(s) to transfer hydraulic fluid between systems.

 B.  It is necessary to pressurize the hydraulic reservoir to do the
 servicing.

 C.  The fill ports for the hydraulic reservoir are in the the wheel well for the left body gear. You can get access to the ports through the landing gear doors.
 D.  These EICAS messages show adjacent to the digital indication of the hydraulic quantity on the auxiliary EICAS display:
 (1)  
A LO (low quantity) message will show when the hydraulic fluid quantity is 0.34 or less.

 (2)  
A RF (refill) message will show when the hydraulic fluid quantity is between 0.35 and 0.75.

 (3)  
A OF (overfull) message will show when the hydraulic fluid quantity is 1.15 or more.

 (4)  
The LO and RF messages show on the EICAS status, synoptic, and maintenance displays. The OF message shows on the EICAS maintenance display.

 TASK 12-12-01-603-001
 2.  Hydraulic Reservoir Servicing (Manual Fill Procedure)(Fig. 301)_____________________________________________________
 A.  Consumable Materials
 (1)  D00153 Fluid - Hydraulic, Fire Resistant, BMS 3-11
 B.  References
 (1)  
AMM 09-11-00/201, Towing Taxiing

 (2)  
AMM 10-11-01/201, Parking (normal)

 (3)  
AMM 12-15-09/301, Hydraulic Brake Accumulator

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 29-11-00/201, Main Hydraulic Supply System

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RESERVOIR FILL  U.S. GAL  IMP GAL  LITRES 
LEVEL  FULL  REFILL  FULL  REFILL  FULL  REFILL 
SEE  A  SYSTEM NO. 1 OR 4  10.6  7.8  8.8  6.5  40.1  29.5 
SYSTEM NO. 2 OR 3  7.0  5.2  5.8  4.4  26.5  19.5 
FILL 
STORAGE TUBE FOR  FILTER 
THE FILLER HOSE 
PUMP 
HANDLE 
PORT 2 
HAND 
PUMP 
FILLER 
HOSE 
SELECTOR 
VALVE 
FLUID 
QUANTITY INDICATOR  FWD  PORT 4  PORT IN  PORT 3  PORT 1  HANDLE SELECTOR VALVE 

PRESSURE FILL CONNECTION
A
Ground Servicing System - Component Location Figure 301
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 C. Access
 (1)  Location Zone
 137A Body Landing Gear Wheel Well, LH

 D. Procedure
 S 863-109
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 863-111

 (2)  
Make sure the airplane is in the correct configuration:

 (a)  
All the landing gear is down.

 (b)  
All the landing gear doors are closed.

 (c)  
The airplane steering is in neutral.
　
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