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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Why Should Your Telebelt Always Wear a Skirt?

Tunnel skirts act as a funnel to direct the flow of material from the feeder belt to the main conveyor. The TB 105, TB 110 and TB 130 all have tunnel skirts, or transfer tunnels located at the feeder transfer. Tunnel skirts are invaluable in ensuring that the flow from the feeder through the transfer and onto the main belt is smooth for more efficient material placement, a cleaner job site and easier cleanup at the end of a job. Due to its design, which incorporates a transfer hopper, the TB 80 is the only Telebelt that doesn’t need a tunnel skirt.

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TB 105 Skirts:

  • Are adjustable as needed by tying the skirts back. This is made simple by using rope or bungee cords to tie the tunnel skirt’s handles back to the transfer stand tubes.
  • Do not require hold-down springs to prevent leaks because the material used is heavy enough to provide a sufficient seal with the belts.

TB 110 and TB 130 Skirts:

  • Can be adjusted in or out, depending on the type of material being conveyed, to expose more or less of the conveyor to carry material away from the feeder transfer. Adjust in for a more narrow exposure when conveying wet concrete, and adjust out for a wide exposure when conveying dry concrete or fill material.
  • Feature easy adjustment by moving the tunnels in or out on two sets of mounting brackets. This can be done in about 10 minutes without the need for any tools.
  • Use hold-down springs to make a seal with the belts that prevents any leakage of material being conveyed.

What Do Boom Covers Actually Do?

Boom covers are a factory-installed standard feature on the main conveyor belt of all Telebelt models and must be used at all times. They prevent material from leaking down onto the return side of the belt or into the structural parts of the boom. Boom covers are located on the base section of the Telebelt, or arm one.

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Why Are Boom Covers So Important?

  • Failure to use your boom cover can result in rock bounce if the belt is set to run too fast, causing rocks to fall through and ride the return side of the belt. This will ultimately punch holes in the belt and dramatically shorten its lifespan.
  • Boom covers prevent large rocks from getting stuck in the roller cradles, ensuring that when the boom retracts, trapped rocks do not bend the roller cradles.

TECH NOTE – BOOM COVERS

To determine if you need to replace your boom cover, stand under the base section and look up. If you see daylight between the boom cover and the main conveyor, it’s time to replace the boom cover. Please contact Putzmeister Customer Support at 1-800-890-0269.