(6)  
IPC 32-53-05 Fig. 1

 (7)  
SSM 32-53-02

 (8)  
WDM 32-53-13

 C.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

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A
747-400 MAINTENANCE MANUAL
 D. Install the Servovalve (Fig. 401)
 S 864-010
 WARNING: REFER TO AMM 32-00-30/201 FOR LOCK THE INSTALLATION PROCEDURE.
_______ DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS THE CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Make sure that you install the door locks of the wing and the body landing gear (AMM 32-00-30/201).

 S 434-011

 (2)  
Put a new seal plate on the ports of the control module.

 S 424-012

 (3)  
Put the servovalve on the seal plate and install the four capscrews.

 (a)  
Tighten the capscrews to a torque of 65 to 70 pound-inches.

 S 434-013
 (4)
Connect the electrical connector to the applicable servovalve.

 (a)  
Right control module
 1) Servovalve electrical connector DX343C

 (b)  
Left control module
 1) Servovalve electrical connector DX358C.

 S 864-014
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE NOSE
_______ AND THE BODY GEAR BEFORE YOU PRESSURIZE THE HYDRAULIC SYSTEMS (AND OPERATE THE STEERING SYSTEMS). THE COMPONENTS THAT MOVE CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  
Pressurize hydraulic system No. 1 (AMM 29-11-00/201).

 (6)  
Do a check on the hydraulic connections for leaks.

 S 864-016

 (7)
Remove the pressure from hydraulic system No. 1 (AMM 29-11-00/201).

 E.
Servovalve Test

 S 794-015
 S 014-017
 (1)  Disconnect the torsion links of the nose landing gear at the apex (AMM 32-21-03/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-018
 (2)  Disconnect the steering actuators of the body landing gear from the torsion link (AMM 32-53-11/201).
 S 864-019
 (3)  Supply electrical power (AMM 24-22-00/201).
 S 864-032
 (4)  Close the circuit breakers as follows for the steering system of the body landing gear: (a) P7 Overhead Circuit Breaker Panel 1) 7G23 BODY GR STRG ARM AC 2) 7G24 BODY GR STRG ARM DC (b) P180 DC Power Distribution Panel 1) J07 ANTI-SKID 1-3 2) F07 ANTI-SKID 1-3 3) J22 ANTI-SKID 5-7 4) F22 ANTI-SKID 6-8 5) F23 ANTI-SKID 9-11 6) J23 ANTI-SKID 10-12 7) F08 ANTI-SKID 13-15 8) J08 ANTI-SKID 14-16 9) F10 BRK CONT IND/TEST 2 10) F25 BRK CONT IND/TEST 1
 S 864-020
 (5)  Pressurize the hydraulic system No. 1 (AMM 29-11-00/201).
 S 864-021
 (6)  Make sure that the tillers of the captain and the first officer are in the neutral position.
 S 864-022
 (7)  Make sure that the rudder pedals are in the neutral position.
 S 864-023
 (8)  Turn the tiller of the captain for a right turn (Clockwise) until the nose wheel angle is 25 degrees or more.
 S 714-024
 (9)  Make sure that the left actuators of the left and the right body landing gears start to extend.
 S 864-025

 (10)
 Turn the tiller of the captain for a left turn (Counterclockwise) until the nose wheel angle is 25 degrees or more.

 S 714-026

 (11)
 Make sure that the right actuators of the left and the right body landing gears start to extend.

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