Sportsmith Blog
1Apr/130

Star Trac: StairMill – How to check Battery Drain and Adjust Chain Tension


Having a problem with you Star Trac StairMill battery draining and the unit not powering up? It’s possible that you have too much tension in the chain system.

Below is a summary of the video above, "Star Trac: E-SM - Battery Drain and Chain Tension" by Star Trac.

  • Perform weight test. This will allow you to verify if there is too much tension.
  • Check chain tension. There should be a 25mm-32mm gap between the Idler Pulley and the chain.
    • If the gap is less then 1 inch you will need to Adjust the Idler Pulley Gap.
    • Loosen both right and left side pillow blocks.
    • Make an adjustment on the set screws using an Allen key. The brackets on the right and left side should be the same. Tight pillow blocks back.
  • Measure chain sag.
    • Place a straight edge across the top and bottom bearing.
    • Measuring the amount of sag from the bottom of the straight edge to the top of the chain there should be ¾”(19mm).
  • Adjusting the Chain Tension for the Correct Amount of Sag.
    • Loosen pillow blocks on both the right and left side of the bottom pulleys.
    • Back out set screws. (Equal amount on both sides).
    •  Before checking sag tighten pillow blocks on both sides.
    •  Should have a ¾”(19mm) gap on both right and left sides.
  • Perform weight test again. Double check the sag measurements and make corrections if the steps still do not move.
  • Test the StairMill before putting the shrouds back on the machine.

For Star Trac Replacement Parts click here.

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