Telebelt Tunnel Skirt Adjustment

This Tricks of the Trade applies to all “active feeder” models below:

TB 110 – TB 130 – TBS 130

The tunnel skirts on Telebelts® are the parts that direct the material from the feeder onto the main belt. They are pinned in place and held down by springs and tensioning chains.

The tunnel skirts can be mounted IN or OUT, depending on job requirements. The IN position would be used for high-slump concrete to keep the concrete from running over the edge of the main belt.

The OUT position is used for low-slump concrete or other dry material. The OUT position exposes more of the main belt, to reduce “bridging” of material.

Steps to Adjusting the Tunnel Skirt: Moving the tunnel skirts is fairly easy and takes less than 15 minutes.

  1. Remove the boom cover hairpins at the rear of the boom, and fold the boom covers forward, exposing the tunnel skirts.
  2. Release the tension on the hold-down springs.
  3. Remove the hairpins at the tunnel skirt mounting pins.
  4. Pull the tunnel skirts back to remove them from the mounting pins.
  5. Move the tunnel skirts to the desired position, push them forward, and insert the retaining hairpins.
  6. Pull and pin the tensioning chains. MAKE SURE there is enough tension to hold the skirt rubber in contact with the main belt. More tension is usually required on the rear tension chains.
  7. Move the boom covers back into position and pin them in place.

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