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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
LOCKING HYDRAULIC ACTUATOR (RIGHT SIDE)
SEE B LOCKING HYDRAULIC ACTUATOR (LEFT SIDE) FWD SEE
A 3. FEEDBACK LVDT ELECTRICAL CONNECTORS
2. UPPER RETRACT
HYDRAULIC LINE1. UPPER FLEX
SHAFT TORQUE BOX (REF)
9. TUBE NUT
FWD

GIMBAL RING
13. STOP
BRACKET

11. LOCKING HYDRAULIC ACTUATOR
4. GIMBAL RING
10. ACTUATOR LOCK  RETAINER
PROXIMITY SENSOR 9. TUBE NUT

SEE C
8. EXTEND
5. LOWER RETRACT HYDRAULIC
HYDRAULIC LINE LINE
7. LOWER FLEX 6. LOCK
SHAFT LEVER
LOCKING HYDRAULIC ACTUATOR
(LEFT SIDE)

A

Locking Hydraulic Actuator Installation
Figure 402 (Sheet 1)

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3. FEEDBACK LVDT CONNECTORS ELECTRICAL 
4. GIMBAL RING RETAINER  2. UPPER RETRACT HYDRAULIC LINE 
GIMBAL RING  1. UPPER FLEX SHAFT 
6. LOCK LEVER 
TORQUE BOX (REF)  8. EXTEND HYDRAULIC LINE 
9. TUBE NUT 
5. LOWER RETRACT HYDRAULIC LINE  10. ACTUATOR SENSOR PROXIMITY LOCK 
9. TUBE NUT  SEE  C 
FWD  7. LOWER FLEX SHAFT  11. LOCKING ACTUATOR HYDRAULIC 
LOCKING HYDRAULIC ACTUATOR (RIGHT SIDE)  SEE  D 
B 

Locking Hydraulic Actuator Installation
Figure 402 (Sheet 2)

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C76403
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
12.  FEEDBACK LVDT
10. ACTUATOR LOCK SEE D PROXIMITY SENSOR TORQUE BOX (REF)
6. LOCK LEVER
FLEXSHAFT (REF)
RETRACT HYDRAULIC LINE (REF)
18.  DEPLOY PROXIMITY
13.  PROXIMITY SENSOR
SENSOR WIRE
14. WIRE
15.  
BOLT

CLAMPS
16.  
WASHER (2)

17.  
NUT (3 LOCATIONS)

C
FULL RETRACT 0.060
POSITION 0.030
1
FEEDBACK FULL EXTENDSTOP POSITIONBOLT
0.060 
0.030  FEEDBACK 
STOP 
1  BOLT 
STOP  11.  LOCKING  STOP  11.  LOCKING 
BRACKET  HYDRAULIC  BRACKET  HYDRAULIC 
ACTUATOR  ACTUATOR 
RETRACTED POSITION  EXTENDED POSITION 

LOCKING HYDRAULIC ACTUATOR FEEDBACK CHECK (BOTTOM VIEW)
D
1
ALL DIMENSIONS ARE IN INCHES
Locking Hydraulic Actuator Installation
Figure 402 (Sheet 3)

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S 844-014-N00
 CAUTION:_______IMMEDIATELY CLEAN ALL OF THE HYDRAULIC FLUID THAT FALLS. THE HYDRAULIC FLUID CAN CAUSE CONTAMINATION OF THE AIRPLANE OR THE ENGINE.
 (7)  Drain the hydraulic fluid from the actuator system (Fig. 403).
 (a)  
Put an applicable container below the lower hydraulic actuator

 (7) to catch the hydraulic fluid (Fig. 403).

 (b)  
Loosen the flexhose couplings for the extend line and retract line at the strut hydraulic connection.

 NOTE: This is done to let air into the actuator system at a
____ high point to drain the hydraulic fluid.
 (c)  
Remove the sync lock (8) from the lower non-locking hydraulic actuator (7) (Fig. 403) (AMM 78-34-13/401).
　
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