Blackmer® helical gear reducers are designed for use with 1,750, 1,150, 1,450, and 950 rpm motors up to 30 hp. A full range of standard reduction ratios are available from 2.24:1 to 9.08:1 to provide standard operation speeds for Blackmer pumps as well as other brands of positive displacement pumps.
Blackmer gear reducers are rated in accordance with practices of ANSI/AGMA 6010. They are manufactured in three sizes (HROF, HRA, and HRB) to accommodate a variety of pump speeds for low to high-viscosity transfer applications.
Gear reducers are available fixed bracket mounted (HROF), or adjustable bracket mounted versions (HRA and HRB) for fast, accurate alignment of pumps/reducers and prime movers.