S 434-006

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

 S 034-016

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

 S 424-007

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

 (a)  
Tighten the low pressure switch.

 (b)  
Install a lockwire.

 S 434-008
 (5)  
Install the electrical connector.

 S 864-009

 (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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A
737-300/400/500MAINTENANCE MANUAL
 D. Do a Check on the Low Pressure Switch
 S 864-010
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 214-011

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

 S 864-012
 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)  Put the applicable ELEC (1 or 2) HYD PUMPS switch to the ON position.
 (a)  Make sure the applicable LOW PRESSURE (ELEC 1 or ELEC 2) light goes off.
 S 864-013
 (4)  
Put the applicable ELEC (1 or 2) HYD PUMPS switch to the OFF position.

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

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

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

 S 794-014
 S 864-015
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A
737-300/400/500MAINTENANCE MANUAL
 STANDBY SYSTEM 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 standby system EMDP low pressure switch.
 TASK 29-34-31-004-010
 2.  Standby System EMDP Low Pressure Switch Removal (Fig. 401)_______________________________________________
 A.  Access
 (1)  Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 215 Keel Beam

 B.  Procedure
 S 864-002
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P6-3 Circuit Breaker Panel 1) INDICATOR MASTER DIM BUS SECT 4

 (b)  
P6-11 Circuit Breaker Panel
 1) STBY HYD PUMP NORMAL

 (c)  
P6-12 Circuit Breaker Panel
 1) STBY HYD PUMP (ALT)

 S 034-001
 (2)
Remove the electrical connector from the low pressure switch.

 S 024-003

 (3)  
Remove the low pressure switch from the standby system pressure module.

 (a)  
Discard the O-rings.

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

 TASK 29-34-31-404-011
 3.  Standby System EMDP Low Pressure Switch Installation (Fig. 401)____________________________________________________
　
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