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* In a five-minute period, do not make more than five starts of
any one pump.
* Wait 30 seconds before you start the pump again.
NOTE: If the fuel temperature increases to more than 90F
(32C), monitor system A and B overheat lights. Move
the pump switch to OFF when the overheat light comes
on.
If you attempt more than five starts in a five-minute period, you
should do one of these steps:
* Run the pump continuously for 5 minutes after the fifth start
(monitor the overheat warning lights)
* Turn the pump OFF and let it cool for more than 30 minutes.
MAIN HYDRAULIC SYSTEMS - ELECTRIC MOTOR-DRIVEN PUMP
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-008
MAIN HYDRAULIC SYSTEMS - ELECTRIC MOTOR-DRIVEN PUMP
MAIN HYDRAULIC SYSTEMS - ELECTRIC MOTOR-DRIVEN PUMP
EFFECTIVITY
GUN ALL 29-10-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-008
THIS PAGE IS INTENTIONALLY LEFT BLANK
MAIN HYDRAULIC SYSTEMS - ELECTRIC MOTOR-DRIVEN PUMP
29-10-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The pressure module does these functions for hydraulic system
A and B:
* Distributes hydraulic pump pressure to user systems
* Cleans pressure fluid from EDP and EMDP
* Monitors EDP and EMDP pressure
* Monitors system pressure
* High pressure system protection.
Location
The system A pressure module is on the left side of the forward
bulkhead of the main gear wheel well.
The system B pressure module is near the center of the forward
bulkhead of the main gear wheel well.
Physical Description
The pressure module has these components:
* Pressure filter (2)
* Pump low pressure switch (2)
* EDP pressure switch auto slat system (system B only)
* Check valve (2)
* Pressure transmitter
* Pressure relief valve.
The pressure modules are interchangeable.
Functional Description
Hydraulic pressure from the EDP and EMDP goes through the
non-bypass, non-cleanable, 5-15 micron cartridge-type
pressure filters to the user systems.
Pump low pressure switches send signals to the hydraulic
panel when the EDP or EMDP pressure decreases to less than
normal.
See the hydraulic indicating system section for more
information about the hydraulic pump low pressure warning
indication. (SECTION 29-30)
The EDP pressure switch auto slat system (system B pressure
module only) sends a signal to the hydraulic power transfer unit
(PTU) system when system B EDP pump pressure decreases to
less than 2350 psi.
See the hydraulic power transfer unit (PTU) system section for
more information about the EDP pressure switch auto slat
system. (SECTION 29-25)
The check valves prevent hydraulic backflow through the
pressure filters. They also isolate the pump low pressure
switches from user system pressure and ground service
disconnect pressure.
MAIN HYDRAULIC SYSTEMS - PRESSURE MODULE
EFFECTIVITY
GUN ALL 29-10-00
Page 23
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-009
A pressure transmitter monitors system pressure and sends
signals to the display electronics unit (DEU)in the electronics
equipment compartment. The DEU sends the data to the
common display system in the flight compartment.
See the hydraulic indicating system section for more
information about the hydraulic pressure indication.
(SECTION 29-30)
The pressure relief valve starts to open at 3500 psi to protect the
system when the system pressure increases to more than
normal.
Training Information Point
CAUTION: MAKE SURE UNWANTED MATERIAL DOES NOT
GO INTO THE MODULE PORTS OR THE
HYDRAULIC LINES DURING THE INSTALLATION.
THIS CAN CAUSE DAMAGE TO THE EQUIPMENT.
You can replace each component in the pressure module.
Filter Element Replacement
CAUTION: PUT HYDRAULIC FLUID IN THE FILTER BOWL
BEFORE YOU PUT THE FILTER ELEMENT IN THE
FILTER BOWL. AIR BELOW THE FILTER ELEMENT
CAN CAUSE DAMAGE TO IT.
NOTE: You can not clean the pressure filters and use them
again.
NOTE: If you replace the filter element you must do the
　
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