PRESSURE MODULE
SEE A
SWITCH PORT
IN THE
PRESSURE MODULE
FWD PRESSURE
MODULE
BACKUP RING
O-RING
BACKUP RING
LOW PRESSURE
SWITCH FOR THE
DEMAND PUMP
SEE B
LOW PRESSURE
SWITCH FOR THE
ENGINE-DRIVEN PUMP
SEE B
ELECTRICAL LOW PRESSURE
CONNECTOR SWITCH
(2 LOCATIONS) (EXAMPLE)
PRESSURE MODULE
B
A
Hydraulic Low Pressure Warning Switch Installation
Figure 401
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A 747-400 MAINTENANCE MANUAL
(3) S 864-004Open the circuit breaker for the applicable hydraulic system: (a) P7 Overhead Circuit Breaker Panel 1) 7F3 HYDRAULICS HYDIM 1 2) 7G3 HYDRAULICS HYDIM 2 3) 7H3 HYDRAULICS HYDIM 3 4) 7J3 HYDRAULICS HYDIM 4
(4) S 034-005Disconnect the electrical connector from the switch.
(5) S 024-006Remove the switch from the pressure module.
(6) S 034-007Install a cap on the switch port, in the pressure module, to keep out contamination.
TASK 29-34-01-404-008
3. Hydraulic Low Pressure Warning Switch Installation (Fig. 401)
__________________________________________________
A. Consumable Materials
(1)
D00153 Fluid - Hydraulic, Fire-Resistant, BMS 3-11
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-09-02/201, Air Ground Relays
(4)
AMM 54-62-00/201, Nacelle Strut Access Panels
(5)
AMM 54-62-02/501, Nacelle Strut Access Doors
C.
Access
(1)
Location Zone 454 System 1 - Strut Trailing Edge Fairing 464 System 2 - Strut Trailing Edge Fairing 474 System 3 - Strut Trailing Edge Fairing 484 System 4 - Strut Trailing Edge Fairing
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A
747-400
MAINTENANCE MANUAL
(2)
Access Panel
454A Trailing Edge Fairing Doors - System 1
464A Trailing Edge Fairing Doors - System 2
474A Trailing Edge Fairing Doors - System 3
484A Trailing Edge Fairing Doors - System 4
D.
Procedure
S 644-009
(1)
Lubricate the O-ring, the backup rings, and the threads on the switch with hydraulic fluid.
S 434-010
(2)
Remove the cap from the switch port in the pressure module.
S 424-011
(3)
Install the switch in the pressure module.
S 434-025
(4)
Safety the switch with a lockwire.
S 434-012
(5)
Connect the electrical connector to the switch.
S 864-013
(6)
Close the circuit breaker for the applicable hydraulic system:
(a)
P7 Overhead Circuit Breaker Panel
1) 7F3 HYDRAULICS HYDIM 1
2) 7G3 HYDRAULICS HYDIM 2
3) 7H3 HYDRAULICS HYDIM 3
4) 7J3 HYDRAULICS HYDIM 4
(7)
Supply electrical power (Ref 24-22-00/201).
S 864-014
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