S 034-004
 (3)  
Remove the electrical connector from the applicable low pressure switch.

 S 024-005

 (4)  
Remove the applicable low pressure switch from the system pressure module.

 (a)  
Discard the O-ring.

 (b)  
Install a plug in the open port of the system pressure module.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SYSTEM A PRESSURE MODULE
SEE A
FWD 
SYSTEM B PRESSURE MODULE 
WHEEL WELL  SEE  B 
ELECTRICAL CONNECTOR  SWITCH LOW PRESSURE ENGINE 1  SWITCH PRESSURE ENGINE 2 LOW ELECTRICAL CONNECTOR 

SYSTEM A PRESSURE
SYSTEM B MODULE
PRESSURE MODULE
SYSTEM A PRESSURE MODULE SYSTEM B PRESSURE MODULE AB
Hydraulic Systems A and B EDP Low Pressure Switch Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 TASK 29-34-11-404-008
 3. Hydraulic System A and B EDP Low Pressure Switch Installation (Fig. 401)
_____________________________________________________________
 A. Consumable Materials
 (1)  
D00567 Skydrol Assembly Lube - MCS 352

 (2)  
D00568 Fluid - Hydraulic, BMS 3-11

 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
71-00-00/201, Power Plant

 C. Access
 (1)  Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 D. Install the Low Pressure Switch
 S 644-009
 (1)  
Apply assembly lube or hydraulic fluid to the O-ring and the threads of the low pressure switch.

 S 434-010

 (2)  
Install the O-ring on the low pressure switch.

 S 034-024

 (3)  
Remove the plug from the system pressure module.

 S 424-011

 (4)  
Install the low pressure switch in the applicable pressure module port.

 (a)  
Tighten the low pressure switch.

 (b)  
Install a lockwire.

 S 434-014
 (5)  
Install the electrical connector.

 S 864-015

 (6)  
Remove the DO-NOT-CLOSE tags and close the applicable circuit breakers:

 (a)  
P6-2 Circuit Breaker Panel 1) HYD SYSTEM ELEC HYD PUMP CONT SYS A 2) HYD SYSTEM ELEC HYD PUMP CONT SYS B

 (b)  
P6-3 Circuit Breaker Panel 1) INDICATOR MASTER DIM BUS SECT 5 (system B) 2) INDICATOR MASTER DIM BUS SECT 6 (system A)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 E. Do a Check on the Low Pressure Switch
 S 864-016
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 214-017

 (2)  
Make sure the applicable LOW PRESSURE light (ENG 1 or ENG 2), on the P5 panel, is on.

 S 864-018
 CAUTION: DO NOT OPERATE THE SYSTEM A OR B HYDRAULIC PUMPS FOR MORE THAN
_______ TWO MINUTES WITHOUT FUEL IN THE FUEL TANKS. THE NO. 1 (FOR SYSTEM A) AND NO. 2 (FOR SYSTEM B) FUEL TANKS MUST HAVE A MINIMUM OF 250 GALLONS (1675 POUNDS/760 KILOGRAMS) OF FUEL IN THEM. IF THERE IS NOT SUFFICIENT FUEL IN THE FUEL TANKS, THE HYDRAULIC SYSTEMS WILL BECOME TOO HOT.
 (3)  Motor the applicable engine (Ref 71-00-00/201).
　
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