S 434-012
 (3)  Install the new O-ring (3) correctly on the differential motor
 shaft.
 S 284-013
 (4)  Make sure the mating surfaces of the hydraulic motor and the
 differential housing are clean.
 S 424-014
 (5)  Install the hydraulic motor:
 (a) Engage the hydraulic motor shaft with the splines on the
 differential motor shaft.
 1) Align the motor mounting flange with the holes in the
 differential housing.
 2) Lift the hydraulic motor into its position.
 (b) Install the bolts (9), washers (10), and nuts (14).
 (c) Install the bolts (5), washers (10), and nuts (14).
 (d) For a new hydraulic motor,
 install the hydraulic fittings:
 1) Apply the assembly lube to the O-rings (11, 16, and 21),
 the backup rings (17 and 20), the fitting threads of the
 adapters (18 and 19), of the elbows (13 and 22), and of the
 plug (25).
 2) Install the O-ring (16), the backup ring (17) and the
 adapter (18).
 3) Install the O-ring (21), the backup ring (20), and the
 adapter (19).
 4) Install the O-ring (11), the union (12), and the elbow
 (13).
 5) Install the O-ring (11), the nut (23), and the elbow (22).
 Align the elbow (22) as shown in Fig. 401.
 6) Install the O-ring (24) and the plug (25).
 S 424-036
 (6)  If the filter module is installed, do the procedure to replace the
 filter element (AMM 27-41-15/401).
 S 434-015
 (7)  Connect the hydraulic lines.
 S 374-016
 (8)  Apply the corrosion inhibiting primer to the open metal surfaces
 around the motor mounting flange.

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747-400 MAINTENANCE MANUAL
 S 864-027
 (9)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E7, L STAB TRIM S/O VLV
 2) 7E20, R STAB TRIM S/O VLV

 S 864-028
 (10)
 Set the STAB TRIM 2 and 3 switches to ON.

 S 414-030

 (11)
 Close the access door 312A (AMM 06-09-05/201).

 S 714-033

 (12)
 Do this task:  "Operational Test - Stabilizer Trim Hydraulic Motor" (Ref paragraph 4.).

 TASK 27-41-10-714-031
 4.  Operational Test - Stabilizer Trim Hydraulic Motor__________________________________________________
 A. References
 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

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

 (3)  
AMM 27-41-00/201, Horizontal Stabilizer Trim Control System

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 B.
Access

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

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

 C.
Procedure

 (1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 864-020

 (2)  
Do this task to pressurize the hydraulic system No. 2 or No. 3 for the applicable test: "Supply Hydraulic Power" (AMM 29-11-00/201).

 S 864-029

 (3)  
Make sure the stabilizers move smoothly in the up or the down direction.

 S 864-017
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 (4)  S 014-032Open the access door 312A (AMM 06-09-05/201).
 (5)  S 794-022Examine the motor and the hydraulic connections for leaks.
 (6)  S 864-023Set the stabilizer to the neutral rig position (3 units of trim) (AMM 27-41-00/201).
　
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