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MAIN HYDRAULIC SYSTEMS - RETURN FILTER MODULE
MAIN HYDRAULIC SYSTEMS - RETURN FILTER MODULE
EFFECTIVITY
GUN ALL 29-10-00
Page 35
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-012
THIS PAGE IS INTENTIONALLY LEFT BLANK
MAIN HYDRAULIC SYSTEMS - RETURN FILTER MODULE
29-10-00
Page 36
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The ground service disconnect module lets you pressurize the
hydraulic systems A and B from a ground service cart.
Location
The hydraulic system A ground service disconnect module is on
the aft bulkhead of the left ram air bay.
The hydraulic system B ground service disconnect module is on
the aft bulkhead of the right ram air bay.
Physical Description
The ground service disconnect module has these components:
* Pressure connection
* Return connection
* Pressure filter.
The pressure and return connections are a quick-disconnect
type fitting.
The pressure filter is a non-bypass type with a non-cleanable, 5-
15 micron, cartridge-type filter element.
Functional Description
Hydraulic system operation from a ground power cart is the
same for both systems A or B. Pressure from the cart is cleaned
before use by the user systems.
Pressurized fluid enters either system A or B and goes to the
system A or B pressure module check valves and the user
systems.
With electrical power and ground hydraulic power on the
airplane, pressure for either system shows on a pressure
indicator in the flight compartment.
See the hydraulic indicating system section for more
information about hydraulic pressure indication.
(SECTION 29-30)
Return fluid from the user systems goes back to the cart through
the ground service disconnect return connection.
Training Information Point
You can not clean the filter element and use it again.
MAIN HYDRAULIC SYSTEMS - GROUND SERVICE DISCONNECT MODULE
EFFECTIVITY
GUN ALL 29-10-00
Page 37
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-013
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.
Hydraulic System A or B Pressurization With a Portable
Hydraulic Cart
WARNING: MAKE SURE THE GROUND LOCKS ARE
INSTALLED IN ALL THE LANDING GEARS
BEFORE YOU PRESSURIZE THE HYDRAULIC
SYSTEM. WITHOUT THE GROUND LOCKS, THE
LANDING GEARS CAN RETRACT AND CAUSE
INJURIES TO PERSONS AND DAMAGE TO
EQUIPMENT.
See the landing gear system section for more information about
the landing gear downlock pins. (SECTION 32-00)
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT
ARE CLEAR OF ALL CONTROL SURFACES
BEFORE YOU SUPPLY HYDRAULIC POWER. THE
AILERONS, RUDDER, ELEVATORS, FLAPS,
SLATS, SPOILERS, LANDING GEAR, AND
THRUST REVERSERS CAN MOVE QUICKLY
WHEN YOU SUPPLY HYDRAULIC POWER. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO EQUIPMENT.
NOTE: Do not operate the EDPs or EMDPs with the portable
hydraulic cart return and pressure lines connected.
This may prevent the pumps from receiving enough
hydraulic fluid from their respective reservoirs and
cavitate the pump.
MAIN HYDRAULIC SYSTEMS - GROUND SERVICE DISCONNECT MODULE
EFFECTIVITY
GUN ALL 29-10-00
Page 38
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-013
MAIN HYDRAULIC SYSTEMS - GROUND SERVICE DISCONNECT MODULE
MAIN HYDRAULIC SYSTEMS - GROUND SERVICE DISCONNECT MODULE
EFFECTIVITY
GUN ALL 29-10-00
Page 39
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-013
General
The EDP operates when the related engine turns.
To stop output flow from the EDP, move the ENG 1 HYD PUMP
or ENG 2 HYD PUMP switch on the hydraulic panel to the OFF
position. This does not stop the rotation of the pump or the
internal pressure in the pump.
Functional Description
The pump can operate in a normal mode or in a depressurized
mode. In the normal mode, the pump is rated at a maximum of
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