C.
Prepare for the Removal

 S 494-014
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1) Install the ground locks in all landing gear (AMM 09-11-00/201).
 S 494-003
 WARNING:  YOU MUST CAREFULLY DO THE STEPS IN THE TASKS BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this task: "Wing Landing Gear Door Lock Installation" (AMM 32-00-30/201).
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747-400 MAINTENANCE MANUAL
 S 494-015
 (3)  
Do this task: "Body Landing Gear Door Lock Installation" (AMM 32-00-30/201).

 S 864-004

 (4)  
Remove the hydraulic pressure from system No. 4 (Ref 29-11-00/201).

 D.
Remove the Downlock Actuator.

 S 024-005
 (1)  
Remove the downlock actuator (1) (Fig. 401):

 (a)  
Remove the hydraulic pressure from the retract side of the downlock actuator: 1) Break the safety wire on one of the bleed plugs on the rod

 end of the actuator. 2) Loosen the bleed plug approximately two turns. 3) Bleed all pressure from the retract side of the actuator.

 (b)  
Disconnect the hydraulic tubes (16 and 25) from the actuator (1).

 (c)  
Install caps on the hydraulic tubes.

 (d)  
Remove the attach bolts (3 and 27) at the ends of the actuator and remove the actuator (1).

 (e)  
If the adapters (13 and 19) are necessary for the installation of a new valve (8), remove the adapters (13 and 19) from the actuator (1). 1) Install plugs in the ports on the actuator.

 (f)  
If you do not remove the adapters (13 and 19), install caps on them.

 TASK 32-32-15-404-006
 3.  Wing Landing Gear Downlock Actuator Installation________________________________________________
 A. Consumable Materials
 (1)  
D00288 Lubricant - MCS 352 (Skydrol Assembly Lube)

 (2)  
D00196 Fluid-Hydraulic - BMS 3-11, Type IV, Class 1

 (3)  
D00633 Grease - BMS 3-33 (preferred)

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747-400
MAINTENANCE MANUAL

JURY STRUT
SEE B
SEE A
FWD
1.  DOWNLOCK ACTUATOR
SEE C
LOWER SIDE STRUT
4. TANG
3. BOLT 1 WASHER
2. GREASE
FITTING

5. NUT
A
6. COTTER PIN
17.  NYLON WASHER
17. NYLON WASHER
28.  
BLEED PLUG (2 LOCATIONS

29.  
SAFETY WIRE 18. BLEEDER

ON ROD END VALVE
OF ACTUATOR)  19. ADAPTER
7. RETAINER
20.  O-RING 22. WASHER
8. VALVE
21.  BACKUP RING
9.
O-RING

10.
BACKUP RING

11.
O-RING

12.
BACKUP RING CLAMP

BRACKET  13. ADAPTER
14.  
O-RING

15.  
BACKUP RING

26. GREASEFITTING
16.  TUBE
27. BOLT 1
23.  NUT
B
25. TUBE
24.  COTTER
PIN
1

INSTALLED IN REVERSED DIRECTION
ON THE RIGHT SIDE C

Wing Landing Gear Downlock Actuator Installation
Figure 401

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