Figure 302
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A72751
A
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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747-400
MAINTENANCE MANUAL
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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747-400
MAINTENANCE MANUAL
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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