(e)  
Remove the O-ring from the valve.

 S 434-033
 (5)  Put covers on the rudder PCU openings.
 TASK 22-12-21-404-009
 3.  Rudder Solenoid and Transfer Valve Installation (Fig. 401)_______________________________________________
 A. Consumable Materials
 (1)  
A00413 Adhesive - Sealant, BMS 5010, BMS 5-26 class B2

 (2)  
D00148 Fluid - Hydraulic, Fire resistant, BMS 3-11 Type IV, Class 1

 B. References
 (1)  
AMM 12-31-51/201, Fin and Rudder Access Doors and Panels

 (2)  
AMM 20-10-44/401, Lockwire

 (3)  
AMM 22-12-32/501, Yaw Damper Solenoid - Adjustment/Test

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 C. Access
 (1)  
Location Zone
 706 Vertical Stabilizer

 (2)  
Access
 9512 TE Access Panel - Rudder
 9514 TE Access Panel - Rudder

 D. Procedure
 S 864-026
 (1)  Make sure you remove the hydraulic pressure from the rudder hydraulic system A and B (AMM 29-15-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
 S 434-030
 (2)  Install the rudder solenoid valve or transfer valve:
 NOTE: Do not install rudder solenoid valves with these part
____ numbers: Boeing P/N 10-60811-1, or -9 Boeing P/N 10-60811-3 with Parker P/N 59600-5007
 Refer to the IPC for correct parts usage.
 (a)  
Remove covers from the valve opening.

 (b)  
Clean the seal plate.

 (c)  
Replace the O-rings if it is not serviceable.

 (d)  
Lubricate the O-rings with hydraulic fluid.

 (e)  
Install the O-ring on the valve.

 (f)  
Put the seal plate in the correct position.

 (g)  
Hold the valve in position and install the mounting bolts.

 (h)  
Tighten the mounting bolts to 40-50 pound-inches.

 S 434-018
 (3)  Install the lockwire (AMM 20-10-44/401).
 E. Rudder Solenoid and Transfer Valve Test
 S 864-032
 (1)  Supply the electrical power (AMM 24-22-00/201).
 S 864-035
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS ELEVATORS, FLAPS, SLATS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Supply hydraulic pressure to the rudder hydraulic systems A and B (AMM 29-15-00/201).
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 ALL  ú ú 02 Page 404 ú Jul 12/99
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A
737-300/400/500MAINTENANCE MANUAL
 S 744-038
 (3)  
AIRPLANES WITH 10-60447 YAW DAMPER COUPLER; Do the Yaw Damper Self-Test in the Yaw Damper System Test (AMM 22-12-00/501).

 S 744-039

 (4)  
AIRPLANES WITH 10-62253 YAW DAMPER COUPLER;
 Do this task: Yaw Damper Coupler - Adjustment/Test
 (AMM 22-12-32/501).

 S 794-029

 (5)  
Visually examine the valve to make sure there are no hydraulic leaks.

 F. Put the Airplane Back to Its Initial Condition
 S 414-020
 (1)  
Install the TE access panels at the lower area of the vertical stabilizer (AMM 12-31-51/201).

 S 864-021

 (2)  
Close these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  
P6 Circuit Breaker Panel
 1) TRIM CONT RUD

 (b)  
P18 Circuit Breaker Panel
 1) YAW DAMPER AC
　
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