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to both the engine-driven pump and the electric motor-driven
pump. The heat exchanger is in the bottom of the number one
fuel tank.
The system B heat exchanger is in the case drain line common
to both the engine-driven pump and the electric motor-driven
pump. The heat exchanger is in the bottom of the number two
fuel tank.
Physical Description
The heat exchanger is a fin-tube type assembly that has these
components:
* Fin-tube core
* Inlet port
* Outlet Port
* Bracket assembly.
The heat exchanger weight is 7.6 lbs.
The heat exchangers are interchangeable.
Functional Description
The heat exchanger for each system receives case drain fluid
from the EDP and the EMDP. Case drain fluid flows through the
heat exchanger when either pump operates.
The heat exchanger transfers heat from the hydraulic fluid to
the fuel in the tank.
Training Information Point
WARNING: MAKE SURE THAT PERSON AND EQUIPMENT
ARE CLEAR OF ALL CONTROL SURFACES
BEFORE YOU APPLY HYDRAULIC POWER. THE
AILERONS, RUDDERS, ELEVATORS, FLAPS,
SLATS, SPOILERS, LANDING GEAR, AND
THRUST REVERSERS CAN MOVE QUICKLY
WHEN YOU APPLY HYDRAULIC POWER. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO EQUIPMENT.
WARNING: OBEY ALL OF THE FUEL TANK PURGING AND
ENTRY PRECAUTIONS. IF YOU DO NOT, INJURY
TO PERSONS AND DAMAGE TO THE AIRPLANE
CAN OCCUR.
MAIN HYDRAULIC SYSTEMS - HEAT EXCHANGER
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-011
CAUTION: DO NOT OPERATE THE SYSTEM A OR THE
SYSTEM B EMDP FOR MORE THAN 2 MINUTES
IF THE NO.1 OR THE NO. 2 FUEL TANK
(RESPECTIVELY) CONTAINS LESS THAN 250
GALLONS (1675 POUNDS, 760 KG) OF FUEL. YOU
MUST LET THE RESERVOIR TEMPERATURE
DECREASE TO THE AMBIENT TEMPERATURE
BEFORE YOU OPERATE THE PUMP AGAIN.
DAMAGE TO THE EQUIPMENT CAN OCCUR.
MAIN HYDRAULIC SYSTEMS - HEAT EXCHANGER
EFFECTIVITY
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-011
MAIN HYDRAULIC SYSTEMS - HEAT EXCHANGER
MAIN HYDRAULIC SYSTEMS - HEAT EXCHANGER
EFFECTIVITY
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-011
Purpose
The return filter modules clean the return hydraulic fluid from
the engine-driven pumps (EDP) or electric motor-driven pumps
(EMDP) before it goes back to the reservoirs.
Location
The return filter module for systems A and B are on the forward
bulkhead of the main gear wheel well, below the reservoirs.
Physical Description
The return filter is a bypass type, with a 15 micron, noncleanable,
cartridge type filter element.
The return filter module has these parts:
* Filter module head
* Filter bowl
* Replaceable filter element.
The filter head has these parts:
* Bypass valve
* Differential pressure indicator
* Check valve (2)
* Shutoff valve.
Functional Description
When a clogged return filter causes a differential pressure
across the filter element of 65 psi, the red differential pressure
indicator will move up and you can see it. The differential
pressure indicator does not move if the temperature is less than
36F (2C).
If the differential pressure is 100 psi or more, the bypass valve
opens and lets the fluid bypass the filter and flow directly into
the reservoir.
Two check valves in the return filter module head create a
negative pressure loop. The negative pressure loop allows
backward flow of hydraulic fluid from the reservoir to the system
without backflush of the filter element.
Training Information Point
To reset the differential pressure indicator after filter element
replacement, push down on the indicator.
When you remove the filter to replace the filter element, the
shutoff valve in the return filter closes to prevent fluid loss from
the reservoir.
You can not clean the filter element and use it again.
MAIN HYDRAULIC SYSTEMS - RETURN FILTER MODULE
EFFECTIVITY
GUN ALL 29-10-00
Page 34
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
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