(b)
Use the bolt alignment guide to install the assemblies (bolt (13), lubrication insert (10), and O-rings (11 and 12)) of the actuator attachment bolt in the yoke (43) and the actuators (31, and 32).
(c)
Install the tang washers (37) and the nuts (34).
(d)
Tighten nut (34) 80 to 100 pound-feet. 1) Loosen the nut and tighten it with your hand to the nearest castellation.
2) Install the lockbolt (33), the washer (35), and the nut (36).
(e)
Apply tamper proof putty to the nut (36) until any movement of the nut can cause the seal to break.
(f)
Remove the caps and the plugs and install the hydraulic lines and the clamps to the actuator.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-018
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR
_______ OPERATION AREA. A FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(3)
Supply hydraulic power to system No. 1 (AMM 29-11-00/201).
S 434-019
(4)
Connect the actuators (31, and 32) at the apex and turn the rod ends to engage the clevises.
NOTE: The actuator must not be locked by a partial extension to
____
permit movement of the clevis.
(a)
Make sure there are no leaks in the hydraulic connections.
(b)
Apply hydraulic pressure to the EXTEND port to release the actuator and extend the shaft approximately 1 inch.
(c)
Turn the clevis manually if it is necessary.
S 864-020
(5)
Remove the hydraulic power (AMM 29-11-00/201).
S 434-021
(6)
Continue to connect the actuators at the apex.
(a)
Use the apex pin alignment guide to install the apex pin assembly in the actuators and spindle.
(b)
Tap the apex pin assembly (apex pin (17), lube insert (15), and O-rings (14)) into the apex through the spindle and actuator clevises.
NOTE: Use a hollow drift to prevent damage to the grease
____
fittings.
(c) Install the splined washer (30) and the nut (27).
S 484-022
(7) Use the support stand to hold the assembly of actuators, the yoke fittings and the attachment fitting in an approximately horizontal position.
NOTE: The assembly must be free to move during the range of travel
____ of each actuator from fully extended to fully retracted.
S 434-023
(8) Replace the electrical conduit and the brake hydraulic hoses (tie out of way to prevent damage during test of actuators) on the apex spindle (19) and install the brackets in its position.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 434-024
(9)
Connect the electrical connectors as follows for the applicable steering actuator of the body landing gear:
(a)
Left body landing gear 1) Left actuator electrical connector DX401. 2) Right actuator electrical connector DX402.
(b)
Right body landing gear 1) Left actuator electrical connector DX404. 2) Right actuator electrical connector DX403.
S 864-025
(10)
Close the circuit breakers as follows:
(a)
P7 Overhead Circuit Breaker Panel
1) 7F25, PSEU SECT 1
2) 7F26, PSEU SECT 2
3) 7G23, BODY GR STRG ARM AC
4) 7G24, BODY GR STRG ARM DC
S 714-026
(11)
Remove the apex pin of the torsion link of the nose landing gear.
S 714-037
(12)
Manually move the upper link (in the held position) through its arc.
(a)
Make sure the torsion link does not hit the P37 panel and the housing of the runway turnoff light.
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