Promethion Metabolic Treadmill – Belt Replacement

This instructional video demonstrates how to remove and replace the running belt on the Promethion Metabolic Treadmill made by Sable Systems International.

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A number of tools will be required. The key tools are included in the accessory kit.

This is a key treadmill maintenance procedure.

  1. Start by setting the chamber horizontal, turn it off, and unplug. Remove the lid and unscrew the side front wall. New treadmills will have thumb screws, so no tools will be required. Always keep a small container to hold the nuts and screws.
  2. Remove the push rod by loosening the set screw on the handle and sliding it off. Then slide the push rod from its port and place aside.
  3. Remove the main litter tray and the secondary litter tray. Then undo the thumb nuts to remove the drive belt cover on the side rear.
  4. Take out the cover plugs in the back of the chamber and use a Phillips screwdriver to loosen the tension screws on the back roller. Alternate full turns of the screws to loosen the roller bracket evenly. Continue with this until both screws are completely loose. Once loose, slide the bracket forward while holding the roller in place, then unhook the roller from the bracket. This frees the belt.
  5. Now, loosen the mounting nuts on the motor bracket and slide the motor up to remove the drive belt. Loosen the set screw on the drive gear and slide the gear off the D-axle.
  6. Undo the nuts and remove the motor completely.
  7. Remove the front roller bracket by undoing the 2 mounting screws situated under the running chamber. Unhook the bracket from the front roller and pull the roller out. The belt can now be removed from the chamber.  While the chamber is now more opened up, this opportunity can also be used to do some deep cleaning in the chamber.

Replacing a New Belt:

  1. Reinsert the front roller through the axle port and hook the belt over the roller. Then fold the rest of the belt over the front of the chamber.
  2. Push the roller back in place and clap the belt against the front of the chamber to hold the roller in place. Now position the roller bracket and slide forward over the roller’s bearing. Make sure that the bracket slots between the bearings’ flanges for a good fit.
  3. Line the bracket up with the mounting holes in the chamber. Check the line up.
  4. Reattach the front roller bracket with its mounting screws from below the chamber. Once the bracket is fixed in place, fold the belt back over the support plate. Hook the motor back on the mounting bolts and loosely tighten the nuts. Leave a bit of play to adjust the motor.
  5. Fit the drive gear over the D-axle and line the set screw up with the flat edge of the D-axle. Also align the gear’s edge with the tip or end of the axel. Now tighten the set screw.
  6. Lift the motor enough to hook the drive belt over the drive and motor gears. Lower the motor until the drive belt tightens and tighten the motor mounting nuts. Slide the back roller bracket forward again and hook the back roller back in.
  7. From the back, insert the screwdriver and grip a tension screw and hold it steady. Align the roller bracket with its screw insert over the screw tip. Slowly turn the screw until the thread grips in the insert. Twist once to hold the screw in the screw insert. Repeat this on the opposite end.
  8. And once both tension screws are seated, proceed with alternate full turns to tighten each tension screw. Only tighten the screws to the point where their tips can be felt through the screw insert openings. The belt is now refitted in the treadmill.
  9. Slide the belt on the roller so that the belt edge aligns along the length of the support panel edge. Power the treadmill on and set a speed of 5 to 10 meters per minute to start belt tracking.
  10. Once rolling, if the belt veers off to one side, tighten the tension screw on the back roller bracket on that same side to correct the tracking. Make sure to make small adjustments to prevent over-correcting the belt’s tracking. Go slow and make sure the belt maintains a stable tracking alignment. The convex rollers of the treadmill will also aid in auto-tracking, easing this process. Once belt tracking is completed, the rest of the reassemble can be completed.
  11. Place the drive belt cover back and fit the thumb nuts.
  12. Reinsert the back cover plugs in the tension screw ports.
  13. Reinsert the push rod and attach the handling knob.
  14. Replace the main and secondary litter trays.
  15. Reattach the side front panel. Newer treadmills will have thumb screws to eliminate the need for tools.
  16. Finally, put the chamber lid back on. This concludes the treadmill belt replacement procedure.