(2)
Supply electrical power (AMM 24-22-00/201).
S 014-002
S 864-003
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A
747-400 MAINTENANCE MANUAL
ENGINE NACELLE STRUT
SEE A 1. AUXILIARY AC MOTOR-DRIVEN HYDRAULIC PUMP
4.
BOLT
5.
WASHER (4 LOCATIONS)
FWD
LEFT SIDE VIEW
A
Auxiliary AC Motor-driven Hydraulic Pump Installation Figure 401 (Sheet 1)
2.
ELECTRICAL CONNECTOR
3.
BONDING JUMPER
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A
747-400
MAINTENANCE MANUAL
1. AUXILIARY HYDRAULIC PUMP
8. CASE DRAIN HOSE
7. PRESSURE HOSE
6. SUPPLY HOSE
ENGINE NACELLE STRUT
SEE B
A
B
BRACKET
A
C
B
4.
BOLT
5.
WASHER (4 LOCATIONS)
C
15. TEE FITTING
FWD
16. RIPPLE
DAMPENER
RIGHT SIDE VIEW B
Auxiliary AC Motor-Driven Hydraulic Pump Installation Figure 401 (Sheet 2)
A47306
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747-400 MAINTENANCE MANUAL
S 864-044
(3) Put the applicable HYD DEMAND 1 or HYD DEMAND 4 switch, on the overhead panel, P5, in the OFF position.
S 864-005
WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC SYSTEM BEFORE
_______ YOU OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID WHICH HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
(4)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 864-006
(5)
Release the pressure in the hydraulic system and the reservoir (AMM 29-11-00/201).
S 864-045
(6)
Open these circuit breakers for the applicable system and attach DO-NOT-CLOSE tags:
(a)
P714 Left Auxiliary External Power Center Panel
1) HYDR AUX AC PUMP 4
B-B C-C
Auxiliary AC Motor-Driven Hydraulic Pump Installation
Figure 401 (Sheet 3)
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747-400 MAINTENANCE MANUAL
2) HYDR AUX AC PUMP 1
S 034-008
(7) Disconnect the electrical connector (2), DM147, from the hydraulic pump (1).
S 494-009
(8) Put a container below the hydraulic pump (1) before you disconnect the hoses.
S 034-034
(9) Do these steps to disconnect the hydraulic hoses from the hydraulic pump (1): (a) Disconnect the supply hose (6) from the reducer (13) in the supply port. (b) Disconnect the T-fitting (15) from the union (11) in the pressure port. (c) Disconnect the case drain hose (8) from the union (9) in the case drain port. (d) Install covers on the openings in the hydraulic hoses to keep out contamination.
S 024-043
(10)
Remove the four bolts (4) and washers (5).
S 034-042
(11)
Disconnect the bonding jumper (3) from the lower left bolt (4).
S 024-041
(12)
Remove the hydraulic pump (1).
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