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6.8 gallons (25.8 liters).
The hydraulic system B reservoir has a total volume capacity of
10.7 gallons (40.6 liters).
Each reservoir is an airtight metal shell that contains these
components:
* Air pressure port
* EDP and EMDP supply line port
* Return line port
* Drain valve
* Hydraulic fluid quantity transmitter/indicator.
Functional Description
The reservoirs are pressurized by the reservoir pressurization
system.
The hydraulic system A reservoir has a standpipe for the
engine-driven pump (EDP). A port at the bottom of the reservoir
supplies fluid to the electric motor-driven pump (EMDP). The
reservoir drain valve at the bottom is manually operated.
The hydraulic system B reservoir has a standpipe for the EDP
and EMDP. A port at the bottom of reservoir supplies fluid to the
power transfer unit (PTU) pump. The reservoir drain valve at the
bottom is a manually operated valve.
The fill and balance line connects the system B reservoir to the
standby reservoir. System B reservoir pressure also
pressurizes the standby hydraulic system reservoir.
See the standby hydraulic system section for more information
for the standby hydraulic system reservoir. (SECTION 29-22)
The quantity indicator shows O for empty, RFL for refill, and F
for full.
See the hydraulic indicating system section for more
information for the hydraulic fluid quantity transmitter/
indicator. (SECTION 29-30)
MAIN HYDRAULIC SYSTEMS - RESERVOIR
EFFECTIVITY
GUN ALL 29-10-00
Page 9
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-005
This table shows nominal quantities at different levels in the
reservoirs.
RESERVOIRS QUANTITY (GAL/L)
QUANTITY SHOWN
ON UPPER
CENTER DISPLAY
UNIT
A
FULL LEVEL 5.7 / 21.6 100%
REFILL 4.7 / 17.7 76%
EDP STANDPIPE 2.3 / 8.5 20%
OVERFILL MORE THAN
5.7 / 21.6
101-106%
B
FULL LEVEL 8.2 / 31.1 100%
REFILL 6.9 / 26.0 76%
FILL & BALANCE 6.6 / 25.1 72%
EDP/EMDP
STANDPIPE
1.3 / 4.9 0%
OVERFILL MORE THAN
8.2 / 31.1
101-106%
MAIN HYDRAULIC SYSTEMS - RESERVOIR
EFFECTIVITY
GUN ALL 29-10-00
Page 10
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-005
MAIN HYDRAULIC SYSTEMS - RESERVOIR
MAIN HYDRAULIC SYSTEMS - RESERVOIR
EFFECTIVITY
GUN ALL 29-10-00
Page 11
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-005
Purpose
The EDP supply shutoff valve for hydraulic system A stops
hydraulic fluid flow from the reservoir to the hydraulic system A
EDP when you move the No. 1 engine fire switch to the up
position.
The EDP supply shutoff valve for hydraulic system B stops
hydraulic fluid flow from the reservoir to the hydraulic system B
EDP when you move the No. 2 engine fire switch to the up
position.
Location
The EDP supply shutoff valve for hydraulic system A is in the
supply line between the reservoir and the No. 1 engine EDP, on
the left side of the upper bulkhead of the main landing gear
wheel well.
The EDP supply shutoff valve for hydraulic system B is in the
supply line between the reservoir and the No. 2 engine EDP, on
the right side of the upper bulkhead of the main landing wheel
well.
Physical Description
The EDP supply shutoff valve is a two-position, 28v dc motoroperated,
normally open valve.
A position indicator on the valve shows valve position, OPEN or
CLSD. You can not use the position indicator to open or close
the EDP supply shutoff valve manually.
Functional Description
When you pull the engine fire switch, the EDP supply shutoff
valve moves to the closed position. This stops the supply of
hydraulic fluid to the EDP.
The EDP supply shutoff valve moves to the open position when
you move the engine fire switch to the down or normal position.
Training Information Point
CAUTION: DO NOT TURN THE FIRE HANDLE. IF YOU TURN
THE FIRE HANDLE, THE FIRE BOTTLE WILL
RELEASE ITS CONTENTS.
Because the supply of hydraulic fluid to the pump stops when
you move the engine fire switch up, case drain flow does not
flow through the EDP.
If the engine continues to turn (windmill) with the valve in the
closed position, the EDP may be damaged. You must do an
　
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