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pressure labels (A, B, QTY%, RF, and PRESS) are also shown
on the systems display in the color cyan. These indications do
not change color as pressure or quantity changes.
See the common display system for more information about the
display electronics unit. (SECTION 31-62)
Training Information Point
To see the systems display, move the lower DU selector on the
display select panel (P1 or P3) to the NORM position and push
the system (SYS) switch on the engine display control panel
(P2).
HYD INDICATING SYS - HYD PRESSURE INDICATING SYS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-006
HYD INDICATING SYS - HYD PRESSURE INDICATING SYS - FUNCTIONAL DESCRIPTION
HYD INDICATING SYS - HYD PRESSURE INDICATING SYS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-006
General
Hydraulic system A and system B pump low pressure switches
send pressure information to the flight compartment when
pump pressure is less than normal.
The standby hydraulic system pump low pressure switch sends
pressure information to the flight compartment when the pump
pressure is less than normal.
location
The hydraulic system A and B EDP and EMDP pump low
pressure switches are on the hydraulic system A and B
pressure modules in the main landing gear wheel well forward
bulkhead.
The standby hydraulic pump pressure switch is on the standby
hydraulic system module in the main landing gear wheel well
aft bulkhead.
Physical Description
Each hydraulic pump low pressure switch is sealed assembly
with a piston, disc spring and electrical switch.
Functional Description
Hydraulic system A and system B engine-driven pump (EDPs)
and electric motor-driven pump (EMDPs) pump LOW
PRESSURE amber lights come on when the hydraulic pump
pressure is less than 1300 psi. The LOW PRESSURE amber
lights go off when the hydraulic pressure is moore than 1600
psi.
The standby hydraulic LOW PRESSURE amber light comes on
when the EMDP pressure is less than 1300 psi and goes off
when the hydraulic pressure is more than 1600 psi.
Training Information Point
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT
ARE CLEAR OF ALL CONTROL SURFACES
BEFORE YOU SUPPLY HYDRAULIC POWER.
AILERONS, RUDDER, ELEVATORS, FLAPS,
SPOILERS, SLATS, AND THRUST REVERSERS
CAN MOVE QUICKLY WHEN YOU SUPPLY
HYDRAULIC POWER. THIS CAN CAUSE INJURY
TO PERSONS AND DAMAGE TO EQUIPMENT.
System A and system B pump low pressure switches are
interchangeable.
The pressure settings of the pump low pressure switches are
not adjustable.
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - HYD PUMP LOW PRESSURE SWITCHES
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-012
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - HYD PUMP LOW PRESSURE SWITCHES
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - HYD PUMP LOW PRESSURE SWITCHES
EFFECTIVITY
GUN ALL 29-30-00
Page 25
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-012
General
Pressure switches monitor the pressure of the engine-driven
pumps (EDPs) and electric motor-driven pumps (EMDPs) in
hydraulic systems A and B. These switches send a signal to the
hydraulic pump LOW PRESSURE amber lights on the hydraulic
panel when the pump pressure is less than normal.
Pump Pressure Switches
One pressure switch for each pump on the system pressure
module monitors the pressure output of the pump.
Hydraulic Pump Pressure Indication
The pump pressure switch closes and supplies a ground when
the pump pressure decreases to less than 1300 psi. The ground
from the pressure switch causes the HYD PUMP LOW
PRESSURE amber light to come on.
The ground from the pressure switch also causes the MASTER
CAUTION light and HYD light on the system annunciator panel
to come on. These lights come on when any of the amber lights
on the hydraulic panel come on.
The LOW PRESSURE amber light, the MASTER CAUTION light
　
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