NAPCO rotary gear pumps can be belt driven with a sheave installed directly on the drive shaft. However a jack shaft will dramatically increase bearing life. An in-line gear reducer is the preferred method to reduce motor speed. The pump and any motor should be rigid so as not to flex when the pump is operating. The pump can also be operated on a truck power take-off with a flexible coupling. Improper alignment of the motor drive with the pump drive shaft will cause premature wear and/or failure of the gears, seals and/or bearings.
To facilitate easy maintenance and repair of the pump, it should be installed with the grease zerks exposed, and with adequate clearances so the end plates can be accessed and removed. (See the “Dimensional Data in this Manual for mounting holes and pump ports.)