USABlueBook-FAQ’s-Aeration

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What kind of oil and how much do I put in the gear case on my positive displacement blower?

The instruction manuals for Sutorbilt Legend, M-D Pneumatics Competitor Plus and Roots URAI blowers (the three brands offered by USABlueBook) all contain information regarding recommended lubricants. If you use regular straight weight, non-detergent petroleum oil, different viscosities are called out for different ambient operating temperatures. The simplest approach is to use synthetic oil that has been specifically selected for use with these series of blowers. One grade of oil covers every operating temperature range for which these blowers have been designed. It flows well at very cold temperatures and does not break down at very high temperatures. The extra cost of using synthetic is minimal considering that most of the gear cases use less than a quart.

The amount of oil held in a gear case will vary with the mounting position of a blower. If blower shafts are in a horizontal plane, more oil will be required than if the shafts are in a vertical plane. Each gear case has multiple drain plugs for satisfying every mounting position and one breather cap is always included. In any position one drain plug will always be on the bottom and the breather plug should always be installed in the top. The drain plug on the side of the gear case closest to the bottom drain plug is generally the fill level plug, but always read your instruction manual to confirm its precise location. Remember, only the lower portion of the gears (lower gear in the case of a vertical mount) are submersed in oil, which is splashed throughout the gear case as the gears turn. Overfilling will result in excessive heat buildup due to the resistance of the oil to gear rotation.