(a)  Make sure the applicable LOW PRESSURE light (ENG 1 or ENG 2) comes on.

 (5)  
Examine the applicable low pressure switch for leaks.

 (6)  
Remove electrical power (Ref 24-22-00/201).

 S 794-022
 S 864-023
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737-300/400/500MAINTENANCE MANUAL
 HYDRAULIC SYSTEMS A AND B EMDP LOW PRESSURE SWITCH - REMOVAL INSTALLATION
_________________________________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task for the removal and a task for the installation of the hydraulic systems A and B EMDP low pressure switch.
 B.  There is a low pressure switch for each electric motor driven pump on the system A and B pressure modules.
 TASK 29-34-21-004-017
 2.  Hydraulic Systems A and B EMDP Low Pressure Switch Removal (Fig. 401)__________________________________________________________
 A.  References
 (1)  AMM 29-15-00/201, Hydraulic Systems A, B and Standby
 B.  Access
 (1)  Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 C.  Procedure
 S 864-001
 (1)  
Remove power from the applicable hydraulic system (AMM 29-15-00/201).

 S 864-002

 (2)  
Open the applicable circuit breakers and attach DO-NOT-CLOSE tags:

 (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)

 S 434-003
 (3)  
Remove the electrical connector from the applicable low pressure switch.

 S 424-004

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

 (a)  Discard the O-ring.
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A

737-300/400/500
MAINTENANCE MANUAL

SYSTEM A PRESSURE MODULE
SEE A
FWD
SYSTEM B PRESSURE MODULE
SEE B
WHEEL WELL
ELECTRICAL
ELECTRICAL CONNECTOR
ELEC 2 LOW PRESSURE SWITCH
SYSTEM A PRESSURE MODULE
SYSTEM A PRESSURE MODULE A
ELEC 1 CONNECTOR
LOW PRESSURE SWITCH
SYSTEM B
PRESSURE
MODULE

SYSTEM B PRESSURE MODULE B
Hydraulic Systems A and B EMDP Low Pressure Switch Installation
Figure 401

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737-300/400/500MAINTENANCE MANUAL
 (b)  Install a plug in the open port of the system pressure module.
 TASK 29-34-21-404-018
 3.  Hydraulic Systems A and B EMDP Low Pressure Switch Installation (Fig. 401)_______________________________________________________________
 A. References
 (1)  AMM 24-22-00/201, Manual Control
 B. Access
 (1)  Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 C. Install the Low Pressure Switch
 S 644-005
 (1)  
　
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