In 2005 Key Technology introduced the StrongArm™, a new spring arm that, depending on conditions, was estimated to last 20% longer than other styles. Eight years later we still have some Iso-Flo® conveyors with the original StrongArms running in factories across the globe. Spring rate consistency is the biggest factor in making the StrongArm a success in reducing maintenance cost and preventing unplanned downtime and the easily identifiable blue spring arms have even been seen on TV programs about how food products are produced.
While they may last longer than any other arm, they don’t last forever. If all other factors, such as product load, product condition, speed, etc. have not changed and you notice a change in the stroke, it is time to change the arms. Rather than adding or replacing a couple of arms, we recommend you replace all of the arms at the same time. Otherwise, you will end up in a continual maintenance routine until all the arms have been replaced.
You should refer to the drawing for your shaker to determine the original number of arms. You should also use steel setup arms (Key Technology part number: 429816.1) to ensure the bed is in the proper position when changing the arms. Refer to the Iso-Flo Technical Manual for detailed instructions, but at a minimum, place the steel setup arms on the corners; one for each corner arm bracket. For longer shakers, placing one on each side in the middle of the length of shaker will help prevent sagging and misalignment of the bed.
After replacing the arms, check the speed and stroke to ensure it meets the design specifications listed on the drawing. Remember the “Max Stroke” stenciled on the side of the frame is NOT the design stroke; it is the point at which you will begin to damage the arms, the bed, or possibly the frame. To measure the speed, our technicians use a tachometer which can be ordered from our PROliance Parts Sales team (Key Technology part number: 016279).