Northrock internal concrete vibrators are built to take a beating. Electric motors are protected by a high strength cast aluminum housing that also dissipates potentially damaging heat. A rugged shock absorbing frame protects the housing while acting as a convenient carrying handle for the unit. Watertight, strain relief power cords take all kinds of abuse on the job and power switches are protected by the frame. 

The Northrock Pro Series of electric vibrators includes three models that range from the Pro 1.5 for small jobs requiring a 1 1/2" head or less, to the Pro 2 + the most versatile motor on the market that can power up to a 2 1/2" head, and finally the Pro 3 which is a true work horse for the most demanding applications. 

Selecting NORTHROCK Electric Motor (see chart in pictures)

1. Determine diameter of head based on radius of influence needed as shown on vibrator specifications chart
2. Determine length of shaft needed to reach bottom of form
3. Using selections from steps 1 and 2 above, determine the appropriate motor

UPGRADE TO NEXT SIZE POWER UNIT UNDER THESE CONDITIONS;

LARGER DIAMETER HEAD MAY BE INSTALLED IN THE FUTURE LOW-SLUMP CONCRETE OR ABNORMAL CONDITIONS EXIST WHICH RESTRICT FLOW UNIT WILL RUN CONTINUOUSLY AS AT A PRECAST PLANT SHAFT CONNECTORS WILL BE USED TO EXTEND SHAFT LENGTH FREQUENCY IS BELOW 10,000 VPM UNDER ANY CIRCUMSTANCES