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Reservoir Fill Filter
_____________________
 A.  The reservoir fill filter is installed between the hand pump and the selector valve. The filter prevents contamination of the system during ground filling. The filter is a noncleanable, nonbypass unit having a filter head, a filter bowl, and a 0.4 to 3 micron disposable element.
Operation
_________
 A.  Functional Description
 (1)  The hydraulic ground servicing system is used for filling the hydraulic reservoirs from one location. Two modes of servicing are provided: manual fill mode, with flow from a container of hydraulic fluid using the hand pump; or pressure fill mode, with flow from a ground servicing cart, that gives both fluid supply and pressure through the fill connection. The selector valve is used to select the reservoir to be filled, and the switch contained in the valve connects the fill indicator into the respective quantity indicating system circuit.
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 29-18-00
 ALL  ú ú 03 Page 1 ú Feb 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE  A 
TUBE STOWAGE FILL HOSE 
HANDLE PUMP 
PORT 2 
HOSE FILL HAND PUMP 
FLUID QUANTITY INDICATOR  FWD  PORT IN PORT 4 CONNECTION PRESSURE FILL  PORT 3 PORT 1  HANDLE SELECTOR VALVE VALVE SELECTOR 
A 
Ground Servicing System - Component Location Figure 1 

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 29-18-00
 ALL  ú ú 02 Page 2 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HAND PUMP - REMOVAL/INSTALLATION
________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the hand pump. The second task installs the hand pump.
 B.  The hand pump is in the left wheel well for the body landing gear.
 TASK 29-18-01-004-001
 2.  Hand Pump Removal (Fig. 401)
_________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 32-00-30/201, Landing Gear Door Locks

 (3)  
IPC 29-18-01 Fig. 1

 B.  
Access

 (1)  
Location Zone
 137A Body Landing Gear Wheel Well, LH

 C.  
Procedure

 S 494-024
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Do this task: Body Landing Gear Door Lock Installation (AMM 32-00-30/201).
 S 494-025
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)
Install the ground locks in all landing gear (AMM 09-11-00/201).

 (3)
Disconnect the fill hose and the outlet tube from the hand pump.

 (4)
Remove the two bolts which attach the hand pump to the bracket.

 S 034-005
 S 034-026
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 29-18-01
 ALL  ú ú 01 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

ASEE HAND PUMP 
FILL HOSE  PUMP OUTLET LINE 
INLET PORT 
FWD 

BRACKET
BOLT WASHER NUT (2 LOCATIONS)
HAND PUMP A
Hand Pump Installation
Figure 401

PRESSURE FILL LINE
OUTLET PORT
HAND PUMP
L57717
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