737-300/400/500
MAINTENANCE MANUAL

HYDRAULIC  SEE  A 
PRESSURE 
SWITCH 
AILERON  SEE  C  SEE  B 
ACTUATOR B 
AILERON 
ACTUATOR A 

HYDRAULIC PRESSURE SWITCH
SEE C ELEVATOR ACTUATOR B
HYDRAULIC PRESSURE SWITCH
SEE C
A/P AILERON ACTUATOR
A
HYDRAULIC PRESSURE SWITCH
SEE C
ELEVATOR
ELECTRICAL ACTUATOR A
RECEPTICLE HYDRAULIC PRESSUREPORT
A/P ELEVATOR ACTUATOR
HYDRAULIC PRESSURE SWITCH B
C
Hydraulic Pressure Switch Installation Figure 401
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 22-11-40
 ALL  ú ú 01 Page 402 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  P18 Circuit Breaker Panel 1) AUTO FLT CONT SYS A ENGAGE INTLK A
 S 494-004
 (3)  Get access to the A/P aileron actuators:
 (a)  
Install the downlocks on the main landing gear (Ref 32-00-01/201).

 (b)  
Make sure the screen doors for tire burst protection are open.

 S 014-005
 (4)  Get access to the A/P elevator actuators:
 (a)  Remove the 3802 tail cone access door (Ref 12-31-41/201).
 S 024-006
 (5)  Remove the hydraulic pressure switch:
 (a)  
Disconnect the electrical connector from the hydraulic pressure switch.

 (b)  
Remove the hydraulic pressure switch.

 (c)  
Remove the O-ring and discard it.

 (d)  
Put a cover on the open hydraulic port.

 TASK 22-11-40-404-015
 3.  Hydraulic Pressure Switch Installation (Fig. 401)______________________________________
 A. Consumable Materials
 (1)  
D00148 Fluid - Hydraulic, Fire Resistant, BMS 3-11, Type IV, Class 1

 (2)  
D00054 Lube - Skydrol Assembly, MCS 352

 B. References
 (1)  
12-31-41/201, Body Section 48 Access Doors and Panels

 (2)  
AMM 20-10-44/401, Lockwire

 (3)  
AMM 22-11-40/501, Hydraulic Pressure Switch

 C. Access
 (1)  
Location Zone
 216 Left Main Wheel Well
 705 Tail Cone Access Door

 (2)  
Access Panel
 3802 Tail Cone Access Door

 D. Procedure
 S 864-013
 (1)  
Remove the cover from the hydraulic port.

 S 424-008

 (2)  
Install the hydraulic pressure switch:

 (a)  
Lubricate the O-ring with assembly lube or hydraulic fluid.

 (b)  
Lubricate the threads of the hydraulic pressure switch with assembly lube or hydraulic fluid.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-11-40
 ALL  ú ú 01 Page 403 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c)  
Install the O-ring on the hydraulic pressure switch.

 (d)  
Install the hydraulic pressure switch.

 (e)  
Tighten the hydraulic pressure switch from 70 to 120 pound-inches.

 (f)  
Install the lockwire (AMM 20-10-44/401).

 (g)  
Connect the electrical connector to the hydraulic pressure switch.

 E. Hydraulic Pressure Switch Test
 S 864-009
 (1) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
 (a)  
P6 Circuit Breaker Panel
 1) AUTO FLT CONT SYS B ENGAGE INTLK B

 (b)  
P18 Circuit Breaker Panel
 1) AUTO FLT CONT SYS A ENGAGE INTLK A

 S 714-010
 (2)  
Do this task: "Hydraulic Pressure Switch - Adjustment/Test" (Ref 22-11-40/501).

 (3)  
Close the screen doors for the tire burst protection.
　
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