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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The controls for the main hydraulic system pumps are on the
hydraulic panel. This panel is on the P5 forward overhead
panel.
The engine fire switches on the P8 aft electronics panel control
the fluid supply to the engine-driven pump (EDPs).
Hydraulic Pump Controls
The EDP and the electric motor-driven pump (EMDP) each have
a switch on the hydraulic panel. The switches have two
positions, ON and OFF.
The ENG 1 HYD PUMP switch controls the EDP for system A.
The ENG 2 HYD PUMP switch controls the EDP for system B.
Each pump has a depressurization solenoid valve. The valve
blocks pump output pressure to the main hydraulic power
system when the ENG 1 or ENG 2 HYD PUMP switch is in the
OFF position.
The ELEC 2 HYD PUMP switch controls the EMDP for system A.
The ELEC 1 HYD PUMP switch controls the EMDP for system B.
Engine Fire Switches
The engine fire switches isolate the engine if there is an engine
fire. Each engine fire switch controls the supply shutoff valve for
its related EDP.
When you operate one of the engine fire switches, the pump
LOW PRESSURE amber light is disarmed and the hydraulic
fluid supply to the related EDP stops.
Hydraulic Pump Low Pressure Warning Indications
Pressure switches on the pressure module monitor the EDP
and the EMDP for low pressure. LOW PRESSURE amber lights
for each EDP and EMDP come on when the pump output
pressure is less than normal. The LOW PRESSURE amber
lights are above each HYD PUMP switch.
See the hydraulic indicating system section for more
information about the hydraulic pump low pressure indication.
(SECTION 29-30)
Hydraulic Pump Overheat Warning Indications
A temperature switch in each case drain line downstream of the
pump monitors the EMDP case drain fluid for overheat. An
amber OVERHEAT light for each EMDP comes on when the
case drain fluid temperature increases to more than normal.
The OVERHEAT lights are above the EMDP LOW PRESSURE
lights.
A temperature switch in each EMDP monitors the temperature
of the EMDP electric motor. This switch sends a signal,
independent of the case drain temperature switch, to the
amber OVERHEAT light on the hydraulic control panel when the
temperature of the EMDP increases to more than normal.
MAIN HYDRAULIC SYSTEMS - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN ALL 29-10-00
Page 5
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-002
See the hydraulic indicating system section for more
information about the hydraulic overheat warning indication.
(SECTION 29-30)
Training Information Point
Because the EDP depressurization solenoid valve gets
electrical power when the EDP HYD PUMP switch is OFF, you
normally keep the switch in the ON position.
While you do maintenance, if the switch is in the OFF position
for a long time, you should open the circuit breaker for the HYD
SYS ENG PUMP DEPRESS VALVE 1 or HYD SYS ENG PUMP
DEPRESS VALVE 2.
MAIN HYDRAULIC SYSTEMS - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN ALL 29-10-00
Page 6
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-002
MAIN HYDRAULIC SYSTEMS - CONTROLS AND INDICATIONS
MAIN HYDRAULIC SYSTEMS - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN ALL 29-10-00
Page 7
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-002
THIS PAGE IS INTENTIONALLY LEFT BLANK
MAIN HYDRAULIC SYSTEMS - CONTROLS AND INDICATIONS
29-10-00
Page 8
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 hydraulic reservoirs supply hydraulic fluid under pressure
to the hydraulic pumps. The reservoirs also get return fluid from
the airplane systems that use hydraulic power.
Location
The hydraulic system A reservoir is in the center of the main
wheel well on the forward bulkhead.
The hydraulic system B reservoir is on the right forward
bulkhead of the main wheel well.
Physical Description
The hydraulic system A reservoir has a total volume capacity of
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