(2)
ENGINES POST-RR-SB 24-9280; Two vanes are installed in the heat exchanger duct on each side of the duct central stiffener. The vanes are connected to a drive shaft which is connected by a lever and control rod to a pneumatic ram. The ram uses HP3 air from the engine to close the vanes and limit the air flow. The ram is attached to a bracket on the engine at the side of the heat exchanger. A thermal switch is installed in the oil exit tube from the heat exchanger. The switch gives a signal to operate a solenoid valve which controls the HP3 air to the ram. The solenoid valve is installed on a bracket at the front flange of the rear LP compressor case.
(3)
The inlet duct of the heat exchanger collects air from the low pressure compressor. This air goes through the cooling element of the heat exchanger. (The cooling element is made up of a number of corrugated fins). IDG oil is carried through this cooling element by oil transfer tubes. Heat from the oil is then transferred to air flowing through the cooling element. After passing through the heat exchanger cooling element, air passes out through the outlet duct. This air is vented out through a cutaway in the engine firewall.
(4)
Oil flow pressure through the cooler is controlled by the pressure relief valve. If the oil inlet pressure exceeds 60-70 psi., the valve operates and progressively opens. This allows oil to bypass the cooler element and therefore protect the element.
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24-11-00
ALL ú ú 01 Page 1 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
SEE A
HIGH SPEED EXTERNAL GEARBOX
QAD RING
TENSION
BOLT OIL-IN LINE
FWD TERMINAL INTEGRATED
BLOCK DRIVE GENERATOR
SEE B
OIL-OUT
ELECTRICAL
LINE
CONNECTOR "B"SCAVENGE FILTER
INTEGRATED DRIVE GENERATOR INSTALLATION A
Generator Drive System - Component Location Figure 1 (Sheet 1)
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24-11-00
ALL ú ú 02 Page 2 ú Jun 20/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
ELECTRICAL
CONNECTOR "B" OIL OUT
CHARGE PRESSURE TEST PORTTERMINAL
BLOCK
GENERATOR TERMINAL COVER
SEE D
SEE C OIL INELECTRICAL CONNECTOR "A"
SCAVENGE FILTER PRESSURE FILL
~P INDICATOR
SCAVENGE ADAPTER (ACTIVATED) FILTER
OVERFLOW DRAIN INTEGRATED DRIVE GENERATOR REAR VIEW
B
LIFTING BOSS
ELECTRICAL TERMINAL
CONNECTOR "B" BLOCK
OIL OUT
SPLINE
ELECTRICAL CONNECTOR "A"
DISCONNECT
RESET RING
RELIEF VALVE CASE THERMAL CASE DRAIN (OIL) OIL IN GOVERNOR ADJUSTMENT
1 FWD
LEFT SIDE FILL (OIL) PRESSURE RELIEF VALVE CASE THERMAL
1
C DRAIN (OIL) OVERFLOW DRAIN CASE OIL LEVEL
(OIL) INDICATOR
1 SEAL DRAIN LINE CONNECTS TO RIGHT SIDE
CASE THERMAL RELIEF VALVE
D
Generator Drive System Component Location
Figure 1 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
24-11-00
ALL ú ú 01 Page 3 ú Sep 15/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
ELECTRICAL CONNECTOR "B"
OIL OUT
CHARGE PRESSURE TEST PORT
TERMINAL
BLOCK
GENERATOR TERMINAL COVER
SEE D
SEE C OIL INELECTRICAL CONNECTOR "A"
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