S 434-020

 (3)  
Install the O-ring on the low quantity switch.

 S 424-021

 (4)  
Install the low quantity switch in the port on top of the standby hydraulic reservoir.

 (a)  Tighten the low quantity switch.
 S 394-022
 (5)  Apply a fillet seal of sealant around the hex nut of the low quantity switch.
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 S 434-023
 (6)  
Install the electrical connector to the low quantity switch.

 S 864-024

 (7)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6-3 Circuit Breaker Panel
 1) INDICATOR MASTER DIM BUS BAT
 2) INDICATOR MASTER DIM BUS NO. 1 DC
 3) INDICATOR MASTER DIM BUS NO. 2 DC
 4) INDICATOR MASTER DIM BUS SECT 1
 5) INDICATOR MASTER DIM BUS SECT 2
 6) INDICATOR MASTER DIM BUS SECT 3
 7) INDICATOR MASTER DIM BUS SECT 4
 8) INDICATOR MASTER DIM BUS SECT 5
 9) INDICATOR MASTER DIM BUS SECT 6
 10) MASTER CAUTION ANNUNCIATOR NO. 1
 11) MASTER CAUTION ANNUNCIATOR BAT

 S 214-025
 (8)  
Make sure the STANDBY HYD LOW QUANTITY light, on the P5 panel, is on.

 S 614-026

 (9)  
Fill the standby and the system B reservoirs (Ref 12-12-00/301).

 S 214-027

 (10)
 Make sure the STANDBY HYD LOW QUANTITY light goes off.

 S 434-001
 CAUTION: MAKE SURE THE DISCONNECT POPPET IS STRAIGHT BEFORE YOU INSTALL
_______ THE HOSE HALF OF THE SELF-SEAL DISCONNECT. IF TOO MUCH TORQUE IS NECESSARY TO DO THE INSTALLATION, DISCONNECT THE SELF-SEAL DISCONNECT AND AGAIN MAKE SURE THE POPPET IS STRAIGHT. AFTER THE INSTALLATION, MAKE SURE THE INDICATOR PINS EXTEND A MINIMUM OF 0.06 INCH. IF THE INDICATOR PINS ARE NOT CORRECTLY EXTENDED, FLUID FLOW WILL BE DECREASED OR STOPPED. THIS CAN CAUSE DAMAGE TO THE RESERVOIR OR THE PUMP.
 (11) Connect the supply line for the standby hydraulic pump at the quick-disconnect at the bottom of the standby hydraulic reservoir.
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 S 094-032
 (12)
 Remove the lock from the depressurization valve.

 S 864-030

 (13)
 Close the system B depressurization valve.

 S 864-029

 (14)
 Pressurize system B reservoir (Ref 29-09-00/201).

 S 794-008

 (15)
 Examine all the connections for leaks.

 S 214-009

 (16)
 Do a check of the system B hydraulic quantity.

 S 614-010

 (17)
 Do the servicing for hydraulic system B if it is necessary (Ref 12-12-00/301).

 (18)
 Remove electrical power (Ref 24-22-00/201).

 S 864-011
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737-300/400/500MAINTENANCE MANUAL
 PUMP LOW PRESSURE WARNING SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________________
 1.  General (Fig. 1)_______
 A.  A low pressure warning system is provided for each hydraulic pump. Low pressure sensing switches are mounted appropriately on each system pressure module. The switches are connected to amber low pressure lights on the P5 panel.
 B.  Two low pressure warning switches, one for the EDP and one for the EMDP, are installed on each system A and B pressure module. The standby low pressure warning switch is installed on the standby system pressure module. Each switch is upstream of the pump check valve.
　
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