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When you add oil, you must attach a drain hose to the IDG overflow drain valve. Add oil until at least one quart (liter) of oil comes out of the drain valve hose, then stop. When the flow out of the overflow hose is within limits, disconnect the pressure fill hose and the drain valve hose.
WARNING: DO NOT LET HOT OIL GET ON YOU. PUT ON CLOTHES, GOGGLES, AND EQUIPMENT FOR PROTECTION OR LET THE IDG BECOME COOL. HOT OIL CAN BURN YOU.
CAUTION:  DO NOT DO THIS TASK FOR A DISCONNECTED IDG. THE OPERATION OF A DEFECTIVE IDG CAN CAUSE DAMAGE TO EQUIPMENT.
WARNING: WHEN YOU CONNECT THE OVERFLOW COUPLING TO THE OVERFLOW DRAIN VALVE, USE A RAG AROUND THE FITTING. THIS WILL PREVENT A SPRAY CAUSED BY PRESSURE IN THE IDG CASE. HOT OIL CAN BURN YOU.
CAUTION:  THE OIL OVERFLOW HOSE AND COUPLING MUST BE CONNECTED TO THE OIL OVERFLOW DRAIN VALVE TO RELEASE INTERNAL PRESSURE IN THE IDG. THE OVERFLOW HOSE AND COUPLING MUST REMAIN CONNECTED TO THE OVERFLOW DRAIN VALVE UNTIL SERVICING IS COMPLETED AND OIL OVERFLOW HAS SLOWED TO A FEW DROPS A MINUTE. FAILURE TO DO THIS CAN RESULT IN OVERFILLING WITH OIL, WHICH CAN CAUSE THE IDG TO BE DAMAGED DURING OPERATION.
CAUTION:  DO NOT MIX TYPES OR BRANDS OF OIL WHEN YOU ADD OR REPLACE THE OIL IN THE IDG. INCORRECT OILS CAN CAUSE DAMAGE TO THE IDG.
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GENERATOR DRIVE -IDG -OIL SERVICING

CAUTION:  MAKE SURE THE DRAIN VALVE HOSE IS CONNECTED TO LET THE OIL DRAIN TO THE CORRECT LEVEL IN THE IDG. TOO MUCH HEAT CAN OCCUR IF THE IDG IS FILLED WITH TOO MUCH OIL.
CAUTION:  DO NOT REMOVE THE OIL OVERFLOW HOSE AND COUPLING FROM THE OVERFLOW DRAIN VALVE UNTIL SERVICING IS COMPLETED AND OIL OVERFLOW HAS SLOWED TO A FEW DROPS A MINUTE. FAILURE TO DO THIS CAN RESULT IN OVERFILLING WITH OIL, WHICH CAN CAUSE THE IDG TO BE DAMAGED DURING OPERATION.
Training Information Point
The IDG oil level data on the electrical maintenance page and the sightglass is not accurate until you wait a minimum of 5 minutes after engine shutdown.
When the IDG operates, the electrical maintenance page does not get new oil level data. The oil level data shows as two dashes.
The oil level data is blank for any of these conditions:
*
Engine shutdown (blank for approximately 10 minutes)

*
Initial GCU power-up (blank for approximately 10 minutes)

*
Data is invalid due to a fault.

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GENERATOR DRIVE -IDG -OIL SERVICING

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GENERATOR DRIVE -IDG -OIL SERVICING

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777 AIRCRAFT MAINTENANCE MANUAL

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Page 32 D633W101-BEJ Jan 05/2002

GENERATOR DRIVE -BACKUP GENERATOR

General
The backup generator is an alternative power source. It can supply 115v ac, 400 Hz, electrical power to the transfer buses.
The backup generator also has permanent magnet generators (PMGs). One PMG supplies the field power for the backup generator. Two PMGs are power sources for the flight control power supply assemblies (PSAs).
Electrical Connections
These are the four electrical connections on the backup generator:
*
Terminal block

*
Electrical connector J1

*
Electrical connector J2

*
Electrical connector J3.

The terminal block connects the power feeder cables to the backup generator. Electrical connector J1 transmits the control inputs and the data outputs of the backup generator. Electrical connectors J2 and J3 connect the backup generator PMG power to the PSAs.
Mechanical Items
You can get access to these mechanical items on the backup generator:
EFFECTIVITY
BEJ ALL

*
Oil in port

*
Oil out port

*
Overtemperature dump valve port

*
Case drain plug

*
Oil filter.

The overtemperature dump valve opens when the generator gets too hot. Generator oil drains through the open valve to the accessory drain.
Maintenance Items
You use these items to maintain the backup generator:
*
Oil level sightglass

*
Overfill drain port
　
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