S 864-019
(10)
Supply electrical power (Ref 24-22-00/201).
S 864-020
(11)
Pressurize the applicable hydraulic reservoir (Ref 29-09-00/201).
S 864-021
(12)
Pressurize the applicable hydraulic system (Ref 29-15-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
S 794-010
(13)
Examine all connections for leaks.
S 864-022
(14)
Remove power from the applicable hydraulic system (Ref 29-15-00/201).
S 864-023
(15)
Remove electrical power (Ref 24-22-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
HYDRAULIC FLUID OVERHEAT WARNING SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________________________
1. General_______
A. An overheat warning system is provided to monitor the fluid operating temperatures of each system A and B EMDP. The standby pump is not fitted with an overtemperature sensing device. A switch placed in each EMDP case drain line is connected to a respective amber light on the P5 panel. The circuit uses 28v dc power routed through circuit breakers on the P6 panel.
B. Each system A and B EMDP also has a built-in temperature sensor which also connects to the overheat lights on the P5 panel.
2. Overheat Lights (Fig. 1)_______________
A. An overheat light for each EMDP is located above it's respective control switch and low pressure light on the P5 panel.
3. Overheat Light Temperature Switches___________________________________
A. The temperature switches react to temperatures exceeding 220° |5° to make contact and turn on the warning light. When the temperature at the switch drops to 165°F, the switch breaks contact turning off the lights. The A and B system switches are located in the wheel well adjacent to the EMDP's in their case drain lines leading to respective case drain filters.
4. Operation_________
A. Functional Description
(1) An overheat switch located in each EMDP case drain line is closed when a high fluid temperature is sensed. The overheat switch provides the completion of the warning light circuit to illuminate the light on the P5 panel. Sensing fluid cooling will automatically break the warning light circuit and extinguish the light.
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A 737-300/400/500MAINTENANCE MANUAL
OVERHEAT LOW PRESSURE LOW PRESSURE LOW PRESSURE OVERHEAT LOW PRESSURE
HYD PUMPS ELEC 1 ENG 2ELEC 2 OFF ON BA ON OFF ENG 1
SYS A EMDP OVERHEAT SWITCH
Hydraulic Fluid Overheat Warning System Schematic Figure 1
T81083
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29-32-01
ALL ú ú 02 Page 2 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
HYDRAULIC FLUID OVERHEAT WARNING SYSTEM - ADJUSTMENT/TEST
_________________________________________________________
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