Regal 53 SC Owner's Manual page 235

Filling Drive Gear Lubricant
Perform the following steps to fi ll the drive gear monitor.
1. Remove the drive gear lube monitor cap.
2. Fill the drive gear lubricant monitor with the after-
break-in high performance gear lubricant (80-90 weight
synthetic Merc oil 92-858064K01) so the gear lubricant
is level with the "cold fi ll level" (cold full line). Make sure
not to overfi ll the monitor (reservoir).
3. Check that the cap rubber gasket is in place and install
the cap.
Changing Drive Gear Lubricant
Note: It is recommended to change the gear drive when
the drive is at operating temperature. At this point, the
used lubricant will fl ow more freely, and will carry away
more impurities, and is easier to remove it.
The gear drive lubricant can be changed in different ways;
one with the boat in the water and the other with the boat
out of the water.
If the vessel is in the water an attachment to drain and
fi ll the drive unit is found at the steering actuator. If the
vessel is out of the water drain the gearcase into a con-
tainer and dispose of properly. A pump connected to a
jug of Merc drive gear lubricant through a special adapter
is used to fi ll the drive unit to the "cold fi ll level".
Refer to the Zeus operator's manual for detailed in-
structions on the above procedure.
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Chapter 5