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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-017
MAIN HYDRAULIC SYSTEMS - SYSTEM B - FUNCTIONAL DESCRIPTION
MAIN HYDRAULIC SYSTEMS - SYSTEM B - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-10-00
Page 55
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-017
General
The ground servicing system fills all hydraulic reservoirs from
one central location.
Location
The system components are in the right main gear wheel well
on the lower outboard area of the forward bulkhead.
Physical Description
These are the ground servicing system components:
* Reservoir fill selector valve
* Reservoir fill filter module
* Reservoir manual fill pump
* Pressure fill connection.
The reservoir fill selector valve is a manually-operated, threeposition
selector valve.
The reservoir fill filter module is a non-bypass type with a noncleanable,
0-3 micron, cartridge type filter element.
The reservoir manual fill pump is a double acting, piston-type
pump. The pump has a spring-loaded one-way check valve in
the piston head and another in the suction port. The pump also
has a manual handle.
Functional Description
The reservoir fill selector valve lets you select which reservoir
will receive hydraulic fluid.
These are the three positions:
* Port A
* Port B
* Closed.
The reservoir fill filter module cleans the hydraulic fluid before it
goes into either of the hydraulic system reservoirs.
The reservoir manual fill pump lets you service all the hydraulic
system reservoirs manually when pressure service equipment
is not available. A suction hose is connected to the pump and is
stowed in brackets when not in use.
The pressure fill connection lets you fill the hydraulic system
reservoirs from a ground servicing cart. A cap covers the
connection when not in use.
Operation
You fill the reservoirs with either of these two procedures:
* Manual fill pump
* Ground service cart.
MAIN HYDRAULIC SYSTEMS - GROUND SERVICING SYSTEM
EFFECTIVITY
GUN ALL 29-10-00
Page 56
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-018
You use the reservoir fill selector valve to send hydraulic fluid
from the manual fill pump or a ground service cart.
* Port A sends hydraulic fluid to the system A reservoir.
* Port B sends hydraulic fluid to system B and the standby
reservoirs.
Move the valve to the closed position after servicing.
You use the manual pump suction hose during the manual fill
operation. One end of the hose connects to the manual fill
pump. The other end of the hose goes in the hydraulic fluid
container. When not in use, put the end of the suction hose in a
protective cover.
Training Information Point
WARNING: DO NOT GET HYDRAULIC FLUID ON YOU.
HYDRAULIC FLUID, BMS 3-11 CAN CAUSE
INJURIES TO PERSONS. IF YOU GET THE
HYDRAULIC FLUID ON YOUR SKIN, FLUSH YOUR
SKIN WITH WATER. IF YOU GET THE HYDRAULIC
FLUID IN YOUR EYES, FLUSH YOUR EYES WITH
WATER AND GET MEDICAL AID. IF YOU EAT OR
DRINK THE HYDRAULIC FLUID, GET MEDICAL
AID.
CAUTION: DO NOT SUPPLY HYDRAULIC FLUID AT MORE
THAN 75 PSI TO THE PRESSURE FILL
CONNECTION. A PRESSURE OF MORE THAT 75
PSI CAN CAUSE DAMAGE TO THE HYDRAULIC
SYSTEM.
CAUTION: USE CLEAN HYDRAULIC FLUID AND CLEAN
EQUIPMENT WHEN YOU FILL THE HYDRAULIC
RESERVOIRS. DIRT CAN CAUSE DAMAGE TO THE
HYDRAULIC SYSTEM.
CAUTION: PROTECT TIRES, GEAR STRUCTURE, AND
SURROUNDING AREA FROM ACCIDENTAL
HYDRAULIC FLUID SPILLAGE. HYDRAULIC
FLUID CAN CAUSE DAMAGE TO EQUIPMENT.
Servicing
To get the correct results when you do a check of the hydraulic
fluid quantities or fill the reservoirs, the airplane should be in
this condition:
* Flight controls - neutral
* LE flaps and slats - up
* TE flaps - up
* Spoilers - down
* Landing gear - down
* Thrust reversers - closed
* Hydraulic system A and system B - off
* Brake accumulator pressure - 2850 psi or more.
If the ambient temperature on the ground is 20F (-6C) or lower at
an arrival location and a fluid level is below REFILL, service the
reservoir to just above REFILL to avoid the overflow of fluid at
the next warmer location.
MAIN HYDRAULIC SYSTEMS - GROUND SERVICING SYSTEM
EFFECTIVITY
GUN ALL 29-10-00
Page 57
D633A101-GUN Oct 10/2005
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