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EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
49-90-00-003
The generator filter element also has a bypass valve to let the
oil flow if there is a clog or the oil is cold. The bypass valve
bypasses oil at 50 to 70 psid.
Oil Temperature Sensor
The oil temperature sensor sends lube oil temperature data to
the ECU. The ECU shuts down the APU if the APU speed is more
than 95 percent and the oil temperature is 290F (143C) or more.
APU LUBRICATION SYSTEM - LUBE MODULE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 49-90-00
Page 8
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-90-00-003
APU LUBRICATION SYSTEM - LUBE MODULE - FUNCTIONAL DESCRIPTION
APU LUBRICATION SYSTEM - LUBE MODULE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 49-90-00
Page 9
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-90-00-003
General
The oil cooler is an air/oil heat exchanger. Compartment and
outside air cool the pressurized oil after it leaves the oil pump.
The oil cooler is on the upper left side of the APU turbine case. It
is part of the eductor cooling system.
The temperature control valve is on the APU gearbox behind
the lube module. The valve controls the oil flow to and from the
oil cooler.
Functional Description
The APU exhaust causes a suction of air from outside through
the eductor inlet duct. This causes the APU compartment and
outside air to move through the oil cooler to cool the APU oil.
The cooling air then flows overboard through the exhaust duct.
The temperature control valve allows oil to bypass the oil cooler
if the oil temperature is less than 140F (60C). The valve lets oil
flow through the cooler if the oil temperature is more than 170F
(78C). If the oil pressure is more than 50 psid across the bypass
valve, the oil bypasses the cooler.
The temperature control valve uses a seal plate for attachment
to the gearbox.
Training Information Point
Replace the seal plate only if you believe there is a leak due to a
seal plate failure.
APU LUBRICATION SYSTEM - OIL COOLER AND TEMPERATURE CONTROL VALVE
EFFECTIVITY
GUN ALL 49-90-00
Page 10
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-90-00-004
APU LUBRICATION SYSTEM - OIL COOLER AND TEMPERATURE CONTROL VALVE
APU LUBRICATION SYSTEM - OIL COOLER AND TEMPERATURE CONTROL VALVE
EFFECTIVITY
GUN ALL 49-90-00
Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-90-00-004
Purpose
The magnetic drain plug collects metallic particles that are in
the engine oil. It has two parts, the magnetic chip collector and
the drain plug. You remove the drain plug to drain the oil out of
the gearbox.
Location
There is one magnetic drain plug. It is on the bottom front of the
gearbox.
Components
These are the components of the magnetic drain plug:
* Magnet plug
* Drain plug
* Magnet
* Packing
* Check valve
* Spring.
The check valve closes to prevent oil loss when you remove the
magnetic chip detector from the magnetic drain plug.
APU LUBRICATION SYSTEM - MAGNETIC DRAIN PLUG
EFFECTIVITY
GUN ALL 49-90-00
Page 12
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-90-00-005
APU LUBRICATION SYSTEM - MAGNETIC DRAIN PLUG
APU LUBRICATION SYSTEM - MAGNETIC DRAIN PLUG
EFFECTIVITY
GUN ALL 49-90-00
Page 13
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-90-00-005
General
The APU lubrication system supplies pressurized oil to cool,
clean, and lubricate APU components and the APU generator. A
scavenge system returns the oil to the reservoir in the gearbox.
Supply
Oil pumps in the lube module, pump oil from the reservoir in the
gearbox. Pressurized oil from the lube module goes to the oil
　
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