29-11-23
ALL ú ú 01 Page 202 ú Feb 10/91
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A
747-400
MAINTENANCE MANUAL
BACKUP RING
SCREW(4 LOCATIONS)
DIFFERENTIAL PRESSUREPACKING INDICATOR
HOSE FOR THE
AUXILIARY PUMP
(IF INSTALLED)
GROUND SERVICE DISCONNECT
BACKUP RING
PACKING
CHECK VALVE FOR THE
ENGINE-DRIVEN PUMP
BACKUP RING
CHECK VALVE FOR THE AUXILIARY PUMP RETAINER RING 1
FILTER PRESSURE MODULE
ELEMENT
PACKING FILTER BOWL
BACKUP RINGS
PACKING
RELIEF
VALVE B
1 RONSON/HYDRAULIC PRESSURE MODULES
Pressure Module and Component Installation
Figure 201 (Sheet 2)
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29-11-23
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 862-004
WARNING:_______ MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES
THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN
CAUSE INJURY TO PERSONS.
(3) Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 862-005
WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
(4)
Release the pressure in the hydraulic system (AMM 29-11-00/201).
S 862-006
(5)
Open the applicable circuit breaker and attach a DO-NOT-CLOSE tag:
(a)
P7 Overhead Circuit Breaker Panel 1) 7F3 HYDIM 1 2) 7G3 HYDIM 2 3) 7H3 HYDIM 3 4) 7J3 HYDIM 4
S 682-007
(6) Drain the hydraulic fluid from the reservoir (AMM 12-12-01/301).
S 022-107
(7) Remove the pressure module:
(a) Disconnect the tubes and the hose from the pressure module.
(b) Install caps on all the openings to keep contamination out.
(c) Disconnect the electrical connectors from the pressure switches
for the engine-driven pump and the demand pump.
(d) Remove the four bolts that attach the pressure module to the
support structure.
(e) Remove the pressure module.
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29-11-23
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 032-011
(8)
If you will install a new pressure module, remove the fittings from the ports of the used pressure module.
(a)
Discard all the packings.
TASK 29-11-23-402-012
3. Pressure Module Installation (Fig. 201)
____________________________
A. Consumable Materials
(1)
D00153 Fluid - Hydraulic, Fire Resistant, BMS 3-11
B.
References
(1)
AMM 12-12-01/301, Hydraulic Systems
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 36-00-00/201, Pneumatic System
(5)
AMM 54-62-00/201, Nacelle Strut Access Panels
(6)
IPC 29-11-23 Fig. 10
C.
Access
(1)
Location Zone
454 System 1 - Strut Aft Fairing
464 System 2 - Strut Aft Fairing
474 System 3 - Strut Aft Fairing
484 System 4 - Strut Aft Fairing
(2)
Access Panel
454AL Trailing Edge Fairing Doors - System 1
464AL Trailing Edge Fairing Doors - System 2
474AL Trailing Edge Fairing Doors - System 3
484AL Trailing Edge Fairing Doors - System 4
D.
Procedure
S 432-013
(1) If the pressure module is new, install the packings and the fittings in the ports of the new pressure module.
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