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* Reservoir
* Standby hydraulic system module
* Case drain filter module.
The standby system electric motor-driven pump (EMDP) is in
the aft wing-to-body fairing.
Hydraulic Power Transfer Unit (PTU) System
These are the components in the main landing gear wheel well:
* Power transfer unit
* PTU pressure filter module
* PTU flow limiter
* PTU control valve
* EDP pressure switch autoslat system.
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Ground Servicing System
The ground servicing system components are in the right
forward corner of the main wheel well.
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
You pressurize the hydraulic systems with the hydraulic pumps
or a ground service cart.
Hydraulic Pump Pressurization
You use the hydraulic panel on the P5 forward overhead panel
to monitor and turn on system A and B hydraulic pumps.
You use the flight control panel on the P5 forward overhead
panel to monitor and turn on the standby pump.
You can pressurize system A and system B with either an
engine-driven pump (EDP) or an electric motor-driven pump
(EMDP). The ELEC 1 and ELEC 2 switches on the hydraulic
panel let you control the EMDPs. The hydraulic LOW
PRESSURE light is off when the hydraulic pressure is normal.
Usually, the ENG 1 and ENG 2 switches are in the ON position.
When the engines are on, the EDPs come on to also pressurize
systems A and B. If you move the ENG switches to the OFF
position, this will stop pump output pressure.
An OVERHEAT light monitors system A and system B only. The
standby hydraulic system does not have an overheat light.
Ground Service Cart Pressurization
To pressurize hydraulic system A, connect a ground service
cart to the left ground service disconnect. To pressurize
hydraulic system B, connect a ground service cart to the right
ground service disconnect.
You do not pressurize the standby system from a ground
service cart.
Training Information Point
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM
ALL CONTROL SURFACES AND THE NOSE GEAR
WHEN HYDRAULIC POWER IS SUPPLIED. THE
AILERONS, ELEVATORS, RUDDER, FLAPS,
SLATS, SPOILERS, AND THE NOSE GEAR ARE
SUPPLIED WITH POWER BY THE HYDRAULIC
SYSTEMS. INJURIES TO PERSONS OR DAMAGE
TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC
POWER IS SUPPLIED.
CAUTION: YOU MUST MONITOR THE INSTRUMENTS AND
INDICATOR LIGHTS FOR THE HYDRAULIC
SYSTEMS WHEN HYDRAULIC SYSTEMS ARE
PRESSURIZED. THIS IS TO MAKE SURE THE
HYDRAULIC SYSTEMS OPERATE CORRECTLY. IF
THE OVERHEAT LIGHT OF A HYDRAULIC SYSTEM
COMES ON, YOU MUST STOP THE OPERATION
OF THAT HYDRAULIC SYSTEM IMMEDIATELY.
DAMAGE TO THE EQUIPMENT CAN OCCUR IF
YOU DO NOT DO THIS.
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EFFECTIVITY
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CAUTION: DO NOT OPERATE THE EMDP FOR MORE THAN
TWO MINUTES IF THE NO. 1 FUEL TANK
CONTAINS LESS THAN 250 GALLONS (1675
POUNDS/760 KILOGRAMS) OF FUEL. YOU MUST
LET THE RESERVOIR TEMPERATURE DECREASE
TO AMBIENT TEMPERATURE BEFORE YOU
OPERATE THE PUMP AGAIN. DAMAGE TO
EQUIPMENT CAN OCCUR IF YOU DO NOT DO
THIS.
If you pressurize the hydraulic systems with the hydraulic
pumps, make sure there is sufficient fuel in the main fuel tanks
to cool the heat exchangers.
Before you pressurize a hydraulic system with a ground service
cart, you must remove the pressure from the hydraulic
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