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APU LUBRICATION SYSTEM - INTRODUCTION
EFFECTIVITY
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APU LUBRICATION SYSTEM - INTRODUCTION
APU LUBRICATION SYSTEM - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The lube module contains many of the lubrication system
components. The lube module is on the front of the APU
gearbox.
Components
The lube module contains lube and scavenge pump elements.
A shaft from the gearbox turns the pump elements. A pressure
regulating/relief valve is also internal to the lube module.
These components are on the outside of the lube module and
are LRUs:
* Filter indicator
* Filter bypass switch
* Oil filter element
* Generator filter element
* Oil temperature sensor.
Training Information Point
The fuel control unit (FCU) attaches to the lube module. You
must first remove the FCU to remove the lube module.
You must remove the FCU and the lube module to replace the
lube module seal plate.
Replace the seal plate only if you believe there is a leak due to a
failed seal plate or when you replace the lube module.
APU LUBRICATION SYSTEM - LUBE MODULE
EFFECTIVITY
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APU LUBRICATION SYSTEM - LUBE MODULE
APU LUBRICATION SYSTEM - LUBE MODULE
EFFECTIVITY
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APU LUBRICATION SYSTEM - LUBE MODULE
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Lube and Scavenge Pumps
The lube and scavenge pumps are on a common shaft. Three of
the pumps are lube pumps. Three elements are startergenerator
scavenge pumps and one is a turbine bearing
scavenge pump.
Pressure Regulating/Relief Valve
The pressure regulating/relief valve keeps the oil pressure at 60
to 74 psi. If the pressure is more than this, the valve returns the
oil to the oil pump inlet. The relief valve is set at 200 to 280 psi.
Temperature Control Valve
The temperature control valve controls the oil flow to the oil
cooler to control oil temperature and to bypass the oil cooler
when the oil is cold.
When the oil temperature is 140F (60C) or less, the valve is fully
open and the oil does not go to the oil cooler. When the oil
temperature is 170F (78C) or more, the valve is fully closed and
the oil goes to the oil cooler. Between temperatures of 140F
(60C) and 170F (78C), the valve is not fully open.
A pressure difference of 50 psid also opens the valve to permit
the oil to continue to flow if the oil cooler clogs.
Oil Filter Elements
There are two interchangeable oil filters. The oil from the APU
generator goes through the generator filter element.
Pressurized oil goes through the oil filter element after it
goes through the oil cooler. The filters are throw-away type
elements. They both have a 10 micron rating.
Oil Filter Bypass Valve and Indicator Button
The oil filter has an indicator button to monitor for filter clogs.
When there is a pressure difference of more than 26 to 40 psid
across the filter and the oil temperature is more than 90F (32C),
the indicator button extends.
The oil filter also has a bypass valve that allows the oil to flow if
there is a clog or the oil is cold. The filter bypasses oil at 50 to 70
psid.
Generator Filter Bypass Valve and Filter Switch
The generator filter element has a filter pressure switch to
monitor for filter clogs. When there is a pressure difference of
more than 30 to 40 psid across the filter, for 5 seconds, the
switch sends a signal to the ECU. The ECU shutsdown the APU
if these occur:
* High filter delta pressure
* Oil temperature is more than 100F (38C)
* Main engines not running for 90 seconds
* Airplane on ground.
APU LUBRICATION SYSTEM - LUBE MODULE - FUNCTIONAL DESCRIPTION
　
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