Yes. Because the standard Opto-Matic oilers are designed to be vented to the outside atmospheric conditions, it is very important that the bearing housing also be vented to the same atmospheric conditions. Always confirm that the bearing housing is vented and the the vent is clear. If the vent is not there or is plugged, this will create a different atmospheric condition inside the bearing housing than that at the oiler, causing a misfeed situation. If there are motor fans or blower motors in the vicinity of either the oiler or vent on the bearing housing, this can also create a different atmospheric condition leading to a misfeed situation.
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