(4)  
Open the circuit breaker for the applicable hydraulic system 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 034-006
 (5)  
Disconnect the electrical connector from the switch for the low pressure warning for the reservoir.

 S 034-007

 (6)  
Remove the bolt which attaches the bonding jumper to the switch.

 S 034-008

 (7)  
Remove the lockwire from the switch.

 S 024-009

 (8)  
Remove the switch from the manifold.

 S 034-010

 (9)  
Remove the O-ring from the switch.

 S 034-032

 (10)
 Discard the O-ring.

 TASK 29-17-08-404-011
 3. Reservoir Low Pressure Warning Switch Installation (Fig. 401)
__________________________________________________
 A. Consumable Materials
 (1)  
D00567 - Lubricant - Skydrol Assembly Lube, MCS 352

 (2)  
G00095 Detector-Leak, Leak-Tek (160X)

 B.
References

 (1)  
AMM 20-22-01/601, Electrical Bonding

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 36-00-00/201, Pneumatic System

 (4)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (5)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 (6)  
IPC 29-17-51

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 ALL  ú ú 03 Page 403 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 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
 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 644-012
 (1)  
Apply lubricant to the new O-ring and the threads on the switch for the low pressure warning for the reservoir.

 S 434-013

 (2)  
Install the O-ring on the switch.

 S 424-033

 (3)  
Install the switch into the manifold.

 S 434-034

 (4)  
Tighten the switch to 145-155 pound-inches (16-17 N.m).

 S 434-035

 (5)  
Install a lockwire between the switch and the adapter.

 S 434-016

 (6)  
Install the nut, washers, and bolt to attach the bonding jumper to the switch.

 S 764-017

 (7)  
Measure the resistance between the bonding jumper on the switch and the airplane structure (AMM 20-22-01/601).

 NOTE: This resistance must be less than 0.0025 ohms.
 S 434-018
 (8)  
Connect the electrical connector to the switch.

 (a)  
Loosen the collar on the backshell.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 03 Page 404 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Pull the backshell down to move the serrations apart.

 (c)  
Turn the backshell to make the wire bundle straight.

 (d)  
Tighten the collar on the backshell.

 S 864-019
 (9)  
Supply electrical power (AMM 24-22-00/201).

 S 864-020

 (10)
 Remove the DO-NOT-CLOSE tag and close the circuit breaker for the applicable hydraulic system:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7F3 HYDIM 1
 2) 7G3 HYDIM 2
 3) 7H3 HYDIM 3
 4) 7J3 HYDIM 4

 
　
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