Sunday Video 3

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12 Responses to Sunday Video 3

  1. SgtBob says:

    Dang!

  2. crawfisher says:

    I suspect a hydraulic cylinder or hose failure spraying on the hot exhaust pipe. I wonder if that failure was identified during the design phase?

  3. Phssthpok says:

    Many moons ago I was running a 6′ Hercules shear and had a primary high pressure hose blow out.

    I was in the middle of cutting some 5/8″ GR50 mild steel when I heard the pump drive motor tone change… like it suddenly wasn’t working as hard.

    I looked up out of curiosity to see a TINY little stream of…something… shooting straight up and turning into a fine mist. Within about two seconds that tiny stream turned into a full-on GUSHER as the hose let loose.

    I ran like that guy did.

    Photo of said shear model: http://data.yodermachinery.com/Upload/Product/Photos/70228_389803.jpg

    That large diameter hose you see arched at the top? Yeah… that’s the one that blew out. There was a 20′ long straight edge bolted to the left side of the bed (I was cutting 30′ long strips down into parts).

    Guess where the E-stop for the shear was?

  4. Al_in_Ottawa says:

    Most hydraulic fluids, including what’s in older automatic transmissions and power steering systems, are petroleum based. Military aircraft started using Skydrol in the ’60s and all the airliners now use it as well.

  5. Large Marge says:

    Around 1990 or so, I stopped by a warehouse to see a pal.
    She pointed to an etching in the concrete wall.
    It was about three inches deep and twelve feet long.
    She told me a hydraulic line blew on a trash hauler as it lifted the Dumpster©.

    That would cut a human in two without breaking a sweat.

    • Elmo says:

      Modern hydraulic machinery, such a excavators and bulldozers, use variable displacement pump systems that run pressures up to 2500 psi. You never want to check for pinhole leaks in hydraulic lines using your fingers unless you wouldn’t mind losing them.

      • ABE says:

        Same with high pressure steam. My father-in-law worked on ships during the war (WWII) and told me the way to find high pressure pin-hole steam leaks (steam is invisible) was to hold a broom and run the bristles over the pipes. When the bristles fell off, you knew you found the leak. Scary shit!

      • Ben C says:

        Mobile equipment passed 2500 PSI 20 years ago. 5000 is standard on excavators now, propel circuits can be over 7k on dozers and other mobile equipment. McNeilus refuse trucks like the one in the vid are usually running around 3000 PSI with spikes (like when the arms stop suddenly as the dumpster tilts) over 6000.

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