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AND NO. 2 (FOR HYDRAULIC SYSTEM B) FUEL
TANKS MUST HAVE A MINIMUM OF 250 GALLONS
(1675 POUNDS/760 KG) OF FUEL IN THEM. IF
THERE IS NOT SUFFICIENT FUEL IN THE FUEL
TANKS, THE ENGINE-DRIVEN PUMPS WILL
BECOME TOO HOT. THIS CAN CAUSE DAMAGE
TO THE ENGINE-DRIVEN PUMPS.
MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP
EFFECTIVITY
GUN ALL 29-10-00
Page 16
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-007
MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP
MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP
EFFECTIVITY
GUN 001-099, 101-115 29-10-00
Page 17
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-007
MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP
MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP
EFFECTIVITY
GUN 201-999 29-10-00
Page 18
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-007
Purpose
The electric motor-driven pumps (EMDPs) supply hydraulic
pressure for hydraulic systems A and B.
Location
The EMDPs are attached to a vibration absorbing mount in the
center of the main wheel well on the forward bulkhead.
Physical Description
The EMDP assembly has these components:
* Oil-cooled, three-phase, 115v ac motor
* Temperature switch
* Centrifugal pump
* Single-stage, variable-displacement, pressure-compensated
hydraulic pump.
The EMDP has these connections:
* Supply (with a quick disconnect at the system A reservoir,
and a quick disconnect between the EMDP and the system B
reservoir)
* Pressure
* Case drain.
The pump weight (dry) is 30 lbs.
An acoustic filter is in the pressure line connected to the EMDP.
Functional Description
Hydraulic fluid goes into the electric motor housing to cool the
electric motor before it goes into the centrifugal pump. The
centrifugal pump pushes the fluid into the single-stage,
variable-displacement, pressure compensated hydraulic pump.
GUN 001-099, 101-115
The hydraulic pump has a rotating cylinder barrel that has nine
pistons. The piston rod ends 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 hydraulic pump has a rotating cylinder barrel that has nine
pistons. The piston rod ends 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
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.
MAIN HYDRAULIC SYSTEMS - ELECTRIC MOTOR-DRIVEN PUMP
EFFECTIVITY
GUN ALL 29-10-00
Page 19
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-008
A pressure compensator in the hydraulic pump maintains a
preset pressure by control of the fluid flow out of the pump in
response to changes in system demands.
Some of the supply fluid in the hydraulic 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.
An internal temperature switch in the EMDP monitors the
temperature of the EMDP electric motor. When the temperature
is 235F (113C) or more, the temperature switch closes to supply
a signal to the hydraulic control panel and turn on the amber
OVERHEAT light for the pump. The temperature switch resets at
temperatures between 185F (85C) and 215F (102C).
The acoustic filter decreases the noise and vibration from the
EMDP.
Retention cables prevent damage to the aileron components if
the EMDP breaks away from its mount.
Bonding jumpers provide a ground from the pump to the
airplane structure.
The EMDP is rated at 5.7 gpm at 2700 psi.
Training Information Point
If you operate the EMDPs intermittently, use this procedure:
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