C.  Procedure
 S 864-013
 (1)  
Release pressure from the hydraulic reservoirs (Ref 29-09-00/201).

 S 864-014

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

 (a)  P6-3 Circuit Breaker Panel 1) INDICATOR MASTER DIM BUS SEC 5 (system B) 2) INDICATOR MASTER DIM BUS SEC 6 (system A)
 S 034-015
 (3)  Disconnect the supply line quick-disconnect to prevent high leakage of fluid.
 NOTE: You can find the quick-disconnect for system A at the
____ reservoir and the quick-disconnect for system B at the EMDP.
 S 034-016
 (4)
Remove the electrical connector from the overheat switch.

 (5)  
Remove the overheat switch from the switch tee.

 S 024-017
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 737-300/400/500MAINTENANCE MANUAL
SEE A
SYSTEM A RESERVOIR  CASE DRAIN LINE  SYSTEM B EMDP  SYSTEM B RESERVOIR 
FWD  SYSTEM A EMDP 

SUPPORT 
BRACKET 
A  WASHER 
OVERHEAT  BULKHEAD NUT 
SWITCH 
SEE  B  TO THE HEAT 
EXCHANGER AND 
THE RESERVOIR 
CASE DRAIN 
O-RING  LINE 
OVERHEAT 
SWITCH 
ELECTRICAL 
CONNECTOR 

OVERHEAT SWITCH FOR SYSTEM A (SYSTEM B IS OPPOSITE)
B
EMDP Hydraulic Fluid Overheat Switch Installation Figure 401
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A
737-300/400/500MAINTENANCE MANUAL
 S 034-018
 (6)  
Discard the O-ring.

 S 434-019

 (7)  
Install a cover on the open port of the tee fitting.

 TASK 29-32-12-404-002
 3.  Hydraulic Fluid Overheat Warning 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
 C. Access
 (1)  Location Zone
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 D. Procedure
 S 644-003
 (1)  
Apply assembly lube or hydraulic fluid to the O-rings and the fittings threads.

 S 424-004

 (2)  
Install the O-ring and the overheat switch in the open port of the tee fitting.

 (3)  
Install a lockwire.

 (4)
Connect the electrical connector to the overheat switch.

 S 434-005
 S 434-006
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A
737-300/400/500MAINTENANCE MANUAL
 S 864-007
 (5)  Remove the DO-NOT-CLOSE tags and close the applicable circuit breakers:
 (a)  P6-3 Circuit Breaker Panel
 1) INDICATOR MASTER DIM BUS SEC 5 (system B)
 2) INDICATOR MASTER DIM BUS SEC 6 (system A)

 S 434-020
 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.
　
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