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STANDBY HYDRAULIC SYSTEM - RESERVOIR
STANDBY HYDRAULIC SYSTEM - RESERVOIR
EFFECTIVITY
GUN ALL 29-22-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The standby hydraulic system electric motor-driven pump
(EMDP) supplies hydraulic pressure to the standby hydraulic
system.
Location
The standby hydraulic system EMDP is in the right aft wing to
body fairing, inboard of the brake accumulator.
Physical Description
The EMDP assembly has these components:
* Three-phase, 400 hertz, 115v ac electric motor
* Variable-delivery, positive-displacement hydraulic pump.
The motor mounts to airplane structure and the pump mounts to
the motor.
The EMDP has these connections:
* Supply
* Pressure
* Case drain.
The EMDP is rated at 3.7 gpm at 2700 psi.
Functional Description
Pressurized hydraulic fluid from the standby hydraulic reservoir
enters the pump through the supply connection. The pump
maintains a supply of pressure to the standby hydraulic system
pressure module.
Some of the supply fluid in hydraulic pump becomes case drain
fluid. The case drain fluid cools and lubricates the pump and
then goes through the case drain filter before it enters the
reservoir.
The motor is air cooled through a cooling duct. Air flows from
outside the airplane and goes thru a vent in the right aft wing to
body fairing access panel to the EMDP cooling duct. Air then
goes thru the EMDP plenum and into the compartment. There is
a hole in the left aft wing to body fairing on the other side of the
fuselage for a vent.
Training Information Point
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT
ARE CLEAR OF RUDDER, THRUST REVERSERS,
AND LEADING EDGE SLATS BEFORE YOU
SUPPLY HYDRAULIC POWER. RUDDER, THRUST
REVERSERS, AND LEADING EDGE SLATS CAN
MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC
POWER. THIS CAN CAUSE INJURY TO PERSONS
AND DAMAGE TO EQUIPMENT.
STANDBY HYDRAULIC SYSTEM - ELECTRIC MOTOR-DRIVEN PUMP
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-005
The hydraulic pump or electric motor can be replaced
individually.
STANDBY HYDRAULIC SYSTEM - ELECTRIC MOTOR-DRIVEN PUMP
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-005
STANDBY HYDRAULIC SYSTEM - ELECTRIC MOTOR-DRIVEN PUMP
STANDBY HYDRAULIC SYSTEM - ELECTRIC MOTOR-DRIVEN PUMP
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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STANDBY HYDRAULIC SYSTEM - ELECTRIC MOTOR-DRIVEN PUMP
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The standby hydraulic system module does these functions:
* Cleans the pressure flow from the standby EMDP
* Controls pressure to the leading edge flaps and slats
* Controls pressure to the standby rudder power control unit
(PCU)
* Supplies metered pressure to the thrust reversers
* Monitor system pressure
* Protect system from over pressure.
The case drain filter module cleans the case drain flow from the
standby pump.
Location
The standby hydraulic system module and the case drain filter
module are on the aft bulkhead of the main landing gear wheel
well.
Physical Description
The standby hydraulic system module has these components:
* Leading edge flaps and slats shutoff valve
* Standby rudder shutoff valve
* Pressure filter module
* Pressure relief valve
* Case drain filter module
* EMDP low pressure switch.
The leading edge flaps and slats shutoff valve and standby
rudder shutoff valve are identical 28v dc, motor-operated
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