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GENERATOR DRIVE - FUNCTIONAL DESCRIPTION
24-10-00
Page 22
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Charge and Scavenge Oil Filters
There are two remove-and-replace oil filters on the IDG. You
check and replace both filters at scheduled intervals. You
should always replace old filters with new filters.
The charge oil filter is downstream of the charge pump. If this
filter clogs, a differential pressure valve opens and lets oil
bypass the filter. There is no indication if this filter clogs.
The scavenge filter is downstream of the scavenge pump. The
differential pressure indicator shows if the filter clogs.
Oil Servicing
You do the oil servicing of the IDG at the pressure fill port. You
must push the push-to-vent-valve to release IDG case air
pressure before you add oil.
The oil that you pump into the IDG flows through the scavenge
filter and then through the heat exchangers and into the IDG
case. Air in the circuit moves ahead of the oil to the IDG sump.
Because it takes time for the oil to flow through external
components, you should add oil slowly. This prevents
overservicing. You pump oil into the IDG until the correct oil
level shows on the oil sight glass.
WARNING: SERVICE TO THE PROPER LEVEL. OPERATION OF
THE IDG WITH TOO MUCH OIL OR WITHOUT
ENOUGH OIL CAUSES DAMAGE TO THE IDG.
WARNING: FAILURE TO PUSH THE CAP OF THE VENT VALVE
TO RELIEVE THE INTERNAL IDG PRESSURE
COULD CAUSE HOT OIL TO SPRAY OUT.
CAUTION: DO NOT MIX DIFFERENT OIL TYPES IN IDG.
MIXING DIFFERENT OIL TYPES CAN CAUSE
DAMAGE TO IDG.
Oil Quantity Check
The oil level sight glass shows the amount of oil in the IDG. The
oil level sight glass cover is black with a silver band. When the
oil level is below the silver band, the IDG oil level is low and it is
necessary to add oil. When the oil level is in the silver band, the
IDG oil level is normal.
When the oil is cold and the level is above the silver band, the
IDG oil level is high and you must drain oil.
When the oil is hot and the level is above the silver DRAIN line,
the IDG oil level is high and you must drain oil. Hot oil, above
the silver band, but below DRAIN, is acceptable.
GENERATOR DRIVE - SERVICING
EFFECTIVITY
GUN ALL 24-10-00
Page 23
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-10-00-015
Because of wing dihedral, the oil level in the sight glass is
different for the left and right engine. You must service to the
correct left or right engine marks on the sight glass. You should
always vent the IDG before you do an oil quantity check.
CAUTION: DO NOT CHECK THE OIL LEVEL OF A
DISCONNECTED IDG. A DISCONNECT CAN
CAUSE AN INCORRECT OIL QUANTITY
INDICATION IN THE IDG. TOO MUCH OR NOT
ENOUGH OIL CAN CAUSE DAMAGE TO THE IDG
DURING CONTINUED OPERATION.
NOTE: Make sure that the engine has been shutdown for a
minimum of 5 minutes before you do an oil quantity
check.
Drain Plug
There is a drain plug at the bottom of the IDG. You use it to drain
the oil from the IDG.
Training Information Point
The IDG has two servicing placards.
The small placard below the sightglass reminds you to vent the
IDG before you do an oil quantity check. Your check may not be
accurate if you do not vent the IDG.
The large placard has a warning and the IDG servicing
instructions. You should always vent the IDG before and after
you service it.
GENERATOR DRIVE - SERVICING
EFFECTIVITY
GUN ALL 24-10-00
Page 24
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-10-00-015
GENERATOR DRIVE - SERVICING
GENERATOR DRIVE - SERVICING
EFFECTIVITY
GUN ALL 24-10-00
Page 25
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-10-00-015
THIS PAGE IS INTENTIONALLY LEFT BLANK
24-20-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
AC generation makes and controls three-phase, 115/200 v ac,
400 Hz power for use by the electrical power system.
AC GENERATION - INTRODUCTION
EFFECTIVITY
GUN ALL 24-20-00
　
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