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Constant Level Oilers
The figure provided here illustrates a constant level oiler. On the right hand side you see the bearing housing containing a rotating bearing. The lower part of the bearing is submerged in the reservoir oil. The bearing housing is provided with a constant level oiler, installed on the left hand side. An inverted glass bulb acts as the oiler reservoir - from which oil flows to the bearing reservoir, when needed. Notice that the oil level in the oiler reservoir is higher than that of the bearing housing reservoir.
The oiler is designed to maintain the desired oil level in the bearing housing. The oiler is provided with an adjustment screw (shown on the left hand side). You can use this screw to set the level at the desired point.
When oil level in the bearing housing drops due to any reason, the oiler allows the makeup oil to flow into the reservoir. Operators need to keep an eye on the glass bulb. When necessary, they should remove it, fill it up with oil and replace it.