B.  Standard Tools and Equipment
 (1)  Container to catch hydraulic fluid (approximately 6 gal capacity)
 C.  References
 (1)  
12-40-00/201, Cleaning and Washing

 (2)  
29-09-00/201, Hydraulic Reservoir Pressurization System

 D.  Access
 (1)  Location Zone
 215 Keel Beam

 E.  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 BAT 2) INDICATOR MASTER DIM BUS NO. 1 DC 3) INDICATOR MASTER DIM BUS NO. 2 DC 4) INDICATOR MASTER DIM BUS SECT 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A STANDBY HYDRAULIC SYSTEM  SWITCH LOW QUANTITY BSEE 
RESERVOIR STANDBY 

KEEL BEAM
ELECTRICAL CONNECTOR
FWD O-RING
STANDBY HYDRAULIC SYSTEM
LOW QUANTITY
A
SWITCH
FLOAT
LOW QUANTITY SWITCH B
Standby Hydraulic System Low Quantity 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 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
 (2)  S 864-003Put the FLT CONTROL B switch to the OFF position.
 (3)  S 864-004Release pressure from system B hydraulic reservoir (Ref 29-09-00/201).
 (4)  S 494-031Install the lock on the depressurization valve when the valve is open.
 (5)  S 034-005Remove the supply line for the standby hydraulic pump at the quick-disconnect at the bottom of the standby hydraulic reservoir.
 (6)  S 864-012Put the hose, with the quick-disconnect coupling half installed, in a container.
 (7)  S 684-014Drain the hydraulic fluid into the container.
 (8)  S 164-015Clean all hydraulic fluid from the installation area if it is necessary (Ref 12-40-00/201).
 (9)  S 494-000Connect the quick-disconnect coupling half to the quick-disconnect at the bottom of the standby hydraulic reservoir.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 034-016
 (10)
 Remove the electrical connector from the low quantity switch.

 S 024-017

 (11)
 Remove the low quantity switch from the standby hydraulic system reservoir.

 S 094-018

 (12)
 Remove the quick-disconnect coupling half and the hose.

 TASK 29-33-21-404-006
 3. Standby Reservoir Low Quantity Switch Installation (Fig. 401)
__________________________________________________
 A. Consumable Materials
 (1)  
D00567 Skydrol Assembly Lube - MCS 352

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

 (3)  
A00626 Sealant - BMS 5-95

 B. References
 (1)  
12-12-00/301, Hydraulic Reservoir

 (2)  
24-22-00/201, Manual Control

 (3)  
29-09-00/201, Hydraulic Reservoir Pressurization System

 C. Access
 (1)  Location Zone
 215 Keel Beam

 D. Procedure
 S 864-007
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 644-019

 (2)  
Apply assembly lube or hydraulic fluid to the O-ring.
　
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