MBW AT84 - Manual (Page 9)

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7. Fill exciter with MBW Ground Pounder® Exciter Oil
until oil starts to drain from oil check plug. See chart
for proper amounts.
8. Replace both plugs.
Checking Exciter Oil
1. Place drum on a level surface
2. Remove oil check plug. The plug is the smaller of the
two on the vent side which also has an allen head
drive.
3. Rotate drum until check plug is at 6 o’clock position.
4. If oil level is adequate, it should dribble out of hole.
5. If necasary, remove fill/drain plug, and add MBW
Ground Pounder® Exciter Oil.