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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