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A
747-400
MAINTENANCE MANUAL
(22)
IDG Servicing Features (Fig. 5)
(a)
An oil level indicator is provided on the bottom of the IDG to show when the oil level is low. The indicator consists of a display prism with two white marks for viewing alignment. The indicator only shows whether the IDG oil level is low. The indicator does not show a high level, nor does it indicate the system oil quantity numerically. A dark prism with an "OK" appearing indicates the IDG oil level is adequate. A shiny bright prism without an "OK" displayed indicates the IDG oil level is low. The indicator reflects light back to the viewer without an "OK" displayed when it is not covered with oil. When the prism is covered with oil, the light is absorbed into the oil and not reflected back to the viewer and an "OK" is displayed. Therefore, when there is no bright spot and an "OK" is displayed in the viewing area, the IDG has enough oil and oil servicing is not required. When there is a bright spot (large or small) and no "OK" is displayed in the viewing area, the oil level is low and the IDG requires servicing.
(b)
The low oil level indicator can operate on low levels of light. Light sufficient to see the white alignment marker is all the light that is needed to view the indicator. Shining a flashlight (or other light source) directly into or onto the viewing face can induce too much light and cause reflections resulting in incorrect interpretation of the indicator.
(c)
The indicator viewing face must be clean before attempting to view the indicator. A dirty viewing face can also cause reflections resulting in incorrect interpretation.
(d)
IDG oil is drained through the case drain plug. Filling the IDG through the pressure fill valve causes oil to first flow through the IDG scavenge filter, then through the external oil circuit, and into the IDG case. Air that is in the circuit is forced out ahead of the oil and escapes through the overflow drain. The oil level rises in the IDG sump until the oil level rises above the top of the standpipe and then flows from the overflow drain.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A 747-400 MAINTENANCE MANUAL
DOG TOOTH CLUTCH SEPARATION POINT
INPUT SPLINE
PAWL TYPE DISCONNECT
INPUT
COUPLING
BALL
SHAFT
THERMAL
SPRING
EUTECTIC SOLDER
RAMP TYPE DISCONNECT
Integrated Drive Generator Disconnect/Reset Mechanism
Figure 6
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400
MAINTENANCE MANUAL
(e) The overflow drain establishes the proper fill level for the IDG oil system. The IDG oil level is correct when oil overflows from the overflow drain and then slows to drops. The overflow standpipe establishes the maximum oil level in the IDG case.
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A
747-400 FAULT ISOLATION/MAINT MANUAL
GENERATOR DRIVE SYSTEM
COMPONENT SHT 102 FIG. QTY ACCESS/AREA REFERENCE AMM
CIRCUIT BREAKER - 1 117AL, MAIN EQUIP CTR, P180-1
GEN DRIVE DISC 1, C10055 1 180L4 *
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