Why do fire trucks have chains hanging from the axles?

Posted 14 February 2011 by

I thought it might have something to do with electrical grounding but that is just my guess.
I also just found out that they have automatic chains for traction in bad weather.

http://www.howstuffworks.com/framed.htm?parent=fire-engine.htm&url=http://www.onspot.com/indhisfr.htm

they are chains for snow/ice conditions. The chains are air-actuated; A wheel is mounted horizontally and rubs against the sidewall of the tire causing it to spin. Small lengths of chain are attached around the wheel and hang down, so when the wheel spins it swings the chains out and they go underneath the tire, giving it more traction.

http://www.onspot.com/indhisfr.htm

You will see grounding chains or metal braided straps that drag on the ground on fuel tankers… Those are for actual grounding of static electrcity.

Post Details

6 Responses to Why do fire trucks have chains hanging from the axles?

  1. rockyfella25 says:

    I know that clear radio communications is very important. That is the reason that some fire trucks and ambulances have "drop" or "drag" chains on them.
    References :

  2. 07_ShelbyGT500 says:

    Yes, they are for traction in snowy/icy conditions.

    They are absolutely not to ground the vehicle.
    References :

  3. the rocket says:

    It takes away static electricity.So you are correct.
    References :

  4. boogie_4wheel says:

    they are chains for snow/ice conditions. The chains are air-actuated; A wheel is mounted horizontally and rubs against the sidewall of the tire causing it to spin. Small lengths of chain are attached around the wheel and hang down, so when the wheel spins it swings the chains out and they go underneath the tire, giving it more traction.

    http://www.onspot.com/indhisfr.htm

    You will see grounding chains or metal braided straps that drag on the ground on fuel tankers… Those are for actual grounding of static electrcity.
    References :

  5. Brett S says:

    yeah that is what is hanging from the axles. they are chains hanging from a device that when they need traction on ice or snow they turn it on and it rotates and trows the chains under the tires every few seconds and it makes it like snow chains for ur tires but u do not have to put them on it is automatic
    References :

  6. Zach says:

    They are sometimes used for traction in icy/snowy conditions.

    We have trucks that have chains that hang from their axle here in Michigan, where those traction systems are illegal. I know they are a control for the ride height of the vehicle. These are vehicles that have rear air suspension. A mechanic can compress the air out of the air bag and raise or lower the vehicle, changing the center of gravity.
    References :

Leave a Reply

Your email address will not be published.Required fields are marked *

*