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inspection of the EDP pressure and case drain filters.
If you replace the EDP supply shutoff valve, remove the
pressure from the reservoir and drain it.
MAIN HYDRAULIC SYSTEMS - EDP SUPPLY SHUTOFF VALVE
EFFECTIVITY
GUN ALL 29-10-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-006
MAIN HYDRAULIC SYSTEMS - EDP SUPPLY SHUTOFF VALVE
MAIN HYDRAULIC SYSTEMS - EDP SUPPLY SHUTOFF VALVE
EFFECTIVITY
GUN ALL 29-10-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
29-10-00-006
THIS PAGE IS INTENTIONALLY LEFT BLANK
MAIN HYDRAULIC SYSTEMS - EDP SUPPLY SHUTOFF VALVE
29-10-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
Purpose
The engine-driven pumps (EDPs) supply hydraulic pressure for
the hydraulic systems A and B.
Location
The EDP mounts with a pump attach clamp to the front face of
the engine accessory gearbox on the left side of the engine.
Physical Description
GUN 001-099, 101-115
The EDP is an axial-piston, variable-displacement, camactuated,
pressure compensated hydraulic pump with a
solenoid-operated depressurization valve.
GUN 201-999
The EDP is an axial-piston, variable-displacement, yokeactuated,
pressure compensated hydraulic pump with a
solenoid-operated depressurization valve.
GUN ALL
The pump has these three lines that attach to it:
* Hydraulic fluid supply line
* Output pressure line
* Case drain line.
The pressure and supply hydraulic line connections at the pump
have a self-sealing, quick release disconnect to prevent
leakage and keep air out of the hydraulic system. The case
drain lines are threaded type fitting.
Quick disconnects on the engine service disconnect panel
support beam permit engine maintenance or removal.
The pump weight (wet) is 32 lbs.
Functional Description
GUN 001-099, 101-115
The pump has a rotating cylinder barrel that has nine pistons.
The pistons ride on an inclined cam surface. As the barrel
rotates, the pistons reciprocate within the barrel. Change to the
incline of the cam changes the stroke of each piston and
changes the variable-displacement of the pump.
GUN 201-999
The pump has a rotating cylinder barrel that has nine pistons.
The pistons ride on an inclined yoke surface. As the barrel
rotates, the pistons reciprocate within the barrel. Change to the
incline of the yoke changes the stroke of each piston and
changes the variable-displacement of the pump.
GUN ALL
MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP
EFFECTIVITY
GUN ALL 29-10-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-007
During the intake stroke of each piston, hydraulic fluid is drawn
in the top of the barrel and into the piston cylinder bores.
During the discharge stroke of each piston, hydraulic fluid is
forced out of the piston cylinder bores and into the output
pressure line.
Some of the supply fluid in the pump becomes case drain fluid.
The case drain fluid cools and lubricates the pump before it
goes to the heat exchanger and reservoir through the case
drain connection.
A pressure compensator in the pump maintains a preset
pressure by control of the fluid flow out of the pump in response
to changes in system demands.
The pump operates in the pressurized or depressurized mode.
In the depressurized mode, the pump is isolated from the
hydraulic system and runs at a zero output flow. The solenoid
operated depressurization valve controls the pressurized or
depressurized modes of the pump.
Both EDPs are rated at 36 gpm at 3000 psi (20685 kpa).
Training Information Point
WARNING: BE CAREFUL WHEN YOU MOVE THE PUMP.
HYDRAULIC FLUID COULD LEAK FROM THE
OPEN PORTS OF THE PUMP. MAKE SURE YOU
WEAR PROTECTIVE CLOTHES AND GLOVES
WHEN YOU MOVE THE PUMP. INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT COULD
OCCUR.
If replacement of the engine-driven pump is necessary, make
sure you wear protective clothing.
CAUTION: DO NOT OPERATE THE HYDRAULIC SYSTEMS A
AND B ENGINE-DRIVEN PUMPS FOR MORE THAN
TWO MINUTES WITHOUT FUEL IN THE FUEL
TANKS. THE NO 1. (FOR HYDRAULIC SYSTEM A)
　
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