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A
747-400 MAINTENANCE MANUAL
 HORIZONTAL STABILIZER TRIM HYDRAULIC MOTORS - REMOVAL/INSTALLATION
__________________________________________________________________
 1.  General_______
 A.  This subject has three tasks. There is one task each for the removal, the installation, and the operational test of the horizontal stabilizer trim hydraulic motor (which is referred to as the "hydraulic motor"). The procedure has these parts:
 (1)  
The removal of the hydraulic motor

 (2)  
The installation of the replacement hydraulic motor

 (3)  
An operational test of the hydraulic motor.

 B.  
The removal and installation procedure is the same for the left and the right hydraulic motor.

 TASK 27-41-10-004-001
 2.  Stabilizer Trim Hydraulic Motor Removal (Fig. 401)_______________________________________
 A.  Standard Tools and Equipment
 (1)  
Bucket - 1 gallon capacity (for hydraulic fluid)

 B.  
References

 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

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

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AIPC 27-41-06, Fig. 1

 C.  
Access

 (1)  
Location Zone
 311 Area Aft of Pressure Bulkhead, LH
 312 Area Aft of Pressure Bulkhead, RH

 (2)  
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door

 D.  
Prepare for Removal

 S 864-002
 (1)  
Do this task to release the pressure in the hydraulic systems No. 2 and No. 3: "Remove Hydraulic Power" (AMM 29-11-00/201).

 (2)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 (3)  
Set the STAB TRIM 2 and 3 switches on the control stand to CUTOUT.

 S 864-003
 S 864-004
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 27-41-10
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747-400
MAINTENANCE MANUAL

Horizontal Stabilizer Trim Hydraulic Motor Installation
Figure 401 (Sheet 1)

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 27-41-10
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747-400 MAINTENANCE MANUAL
9. BOLT
9. BOLT5. BOLT 5. BOLT
10. WASHER
10. WASHER
(2 LOCATIONS)

25. PLUG
11. O-RING
11. O-RING
10. WASHER 12. UNION
24. O-RING
23. NUT
13. ELBOW
10. WASHER22. ELBOW 14. NUT
21. O-RING
15. MOTOR
20. BACKUP RING
16. O-RING
19. ADAPTER
17.
BACKUP RING

18.
ADAPTER

HYDRAULIC MOTOR
B
Horizontal Stabilizer Trim Hydraulic Motor Installation Figure 401 (Sheet 2)
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 27-41-10
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747-400
MAINTENANCE MANUAL

SEAL DRAIN ADAPTER (EXAMPLE)

D

THE LEFT INSTALLATION IS SHOWN; THE RIGHT IS OPPOSITE. (ADAPTERS ARE INSTALLED ON THE OUTBOARD SIDES OF THE MOTORS AND POINT FORWARD)
Horizontal Stabilizer Trim Hydraulic Motor Installation Figure 401 (Sheet 3)
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