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operated electrical switch.
Functional Description
When the hydraulic fluid temperature in the case drain line from
the EMDP increases to 225F or more, the switch sends a signal
to the hydraulic panel. This turns on the HYD PUMP OVERHEAT
amber light. When the hydraulic temperature in the case drain
line decreases to less than 185F (85C), the hydraulic pump
OVERHEAT amber light goes off.
Training Information Point
CAUTION: DO NOT REMOVE OR INSTALL THE OVERHEAT
SWITCH WITH THE ELECTRICAL CONNECTOR
ATTACHED TO THE OVERHEAT SWITCH. YOU
CAN CAUSE DAMAGE TO THE OVERHEAT
SWITCH OR THE CONNECTOR.
HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - HYD FLUID OVERHEAT WARNING SWITCH
EFFECTIVITY
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HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - HYD FLUID OVERHEAT WARNING SWITCH
HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - HYD FLUID OVERHEAT WARNING SWITCH
EFFECTIVITY
GUN ALL 29-30-00
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General
Hydraulic fluid overheat warning switches monitor the
temperature of the case drain hydraulic fluid in hydraulic
systems A and B. These switches send signals to the
OVERHEAT lights on the hydraulic control panel when the
temperature of the EMDP case drain hydraulic fluid increases to
more than normal.
A temperature switch in each electric motor-driven pump
(EMDP) for systems A and B monitors the temperature of the
EMDP electric motor. This switch sends a signal, independent
of the case drain overheat warning switch, to the overheat light
on the hydraulic control panel when the temperature of the
EMDP increases to more than normal.
Hydraulic Fluid Overheat Warning Switches
The hydraulic fluid overheat warning switches supply a ground
for the amber OVERHEAT light when the pump case drain
hydraulic fluid temperature increases to more than 225F (107C).
This lets 28v dc from bus 2 go through the master dim and test
system to the hydraulic panel and turn on the amber
OVERHEAT light.
The ground from the hydraulic fluid overheat warning 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 amber OVERHEAT light, the MASTER CAUTION light, and
the HYD light go off when the temperature of the pump case
drain hydraulic fluid decreases to less than 185F (85C).
Hydraulic Pump Temperature Switches
The EMDP temperature switch closes and supplies a ground for
the amber OVERHEAT light when the hydraulic fluid
temperature in the pump electric motor housing increases to
more than 235F (113C). This lets 28v dc from bus 2 go through
the master dim and test system to the hydraulic panel and turn
on the amber OVERHEAT light.
The ground from the EMDP temperature 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 amber OVERHEAT light, the MASTER CAUTION light, and
HYD light goes off when the pump temperature decreases to
less than 185F (85C) and the temperature switch opens.
See the main hydraulic system section for more information
about the electric motor-driven pump. (SECTION 29-10)
HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-007
HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - FUNCTIONAL DESCRIPTION
HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-30-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-007
CHAPTER
30
Ice and Rain Protection
Subject/Page Date COC
EFFECTIVE PAGES
1 thru 3 Oct 10/2006
4 BLANK
30-CONTENTS
1 Oct 10/2005
2 Oct 10/2005
3 Oct 10/2005
4 Jun 10/2003
30-00-00
1 Oct 10/2002
R 2 Oct 10/2006
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