Announcement

Collapse
No announcement yet.

two-engine scrapers

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • two-engine scrapers

    Construction has begun on a 67-unit housing development in my neighborhood. I had a look at the two Caterpillar 627G scrapers on the job. I'd never walked around one of these before so was surprised to see that they have an engine in the front, another in the rear.



    There are two throttle pedals in the cab, one for each engine. That must take some getting used to.



    The 627G is a medium-sized scraper. How big to these things get?
    Allan Ostling

    Phoenix, Arizona

  • #2
    Good lord, what size lathe do you use that sucker on?!

    (Oh not that sort of scraper! )

    Comment


    • #3
      Great pics!! Not sure how many yards the bucket is, but yup "Pull and Push".
      When i was 8 or so used to ride my bike out of town to watch scrapers like that working at building the 4 lane hwy #401 in the early 50's.
      Those scrapers were branded "Turnopole" (Spelling.)

      Comment


      • #4
        Originally posted by sasquatch View Post
        Those scrapers were branded "Turnopole" (Spelling.)
        Tournapull, made by the R.G LeTourneau Co.

        Dave

        Comment


        • #5
          Thanks Becksmachine, it was exciting times for an 8 year old to watch these mighty machines bounce along.

          Comment


          • #6
            Two engine scrapers are fairly common.

            RG Letourneau made one with 8 engines and 3 scraper pans and 6 axles. Was used near Longview Texas when building Interstate 20. It may also have been used during the construction of Lake of the Pines in East Texas. It was HUGE! Seems like it was something like 1200 Cu. Yards.

            Comment


            • #7
              I've seen the old single engine "pans" as we call them & when full they had to be pushed with a dozer, so this cures that problem.

              Comment


              • #8
                Originally posted by becksmachine View Post
                Tournapull, made by the R.G LeTourneau Co.

                Dave
                As a side note R. G. LeTourneau was a truly amazing engineer. He had virtually no education (he didn't even finished high school) and learned welding, fabrication, and mechanics in the field. He was a prolific innovator and amassed hundreds of patents during his life.
                Mike
                Central Ohio, USA

                Comment


                • #9
                  Originally posted by kf2qd View Post
                  RG Letourneau made one with 8 engines and 3 scraper pans and 6 axles.
                  The only reference I have found to this is from http://www.ritchiewiki.com/wiki/inde...trous_Machines. I wish we could see a photo.

                  With the development of the Electric Digger series in the 1950s, LeTourneau’s company manufactured the world’s largest motor scrapers.[4] The Goliath, or Model A4, was the biggest motor scraper built to date. This model contained an electric motor in every wheel. Following the Goliath was the development of the LT-360. This scraper, the biggest ever built, included three bowls for a capacity of 216 cubic yards (165 m3). It moved, with the power of eight 635 horsepower engines, on eight wheels that each measured more than 10 feet (3 m) in diameter. LeTourneau’s scrapers never sold in large numbers; they were mostly considered experimental.
                  Allan Ostling

                  Phoenix, Arizona

                  Comment


                  • #10
                    Thanks to leading me into some research and photo viewing.
                    Being a midwest farm boy I really never had the opportunity to see heavy industry until the web and all contributers made it available.
                    http://photostp.free.fr/phpbb/viewtopic.php?f=13&t=8607

                    It appears LeTourneau has made some interesting behemoth's.

                    Comment


                    • #11
                      Spent most of my working life keeping these things running. You will notice a a push block and bale on the front and a post on the back. They usually run two of these machines together.
                      The machine at the back hooks his bale over the post then pushes while the front machine loads, then the rear one loads while the front one pulls. That way they have four engines to do the work.
                      The other alternative is to use single engine scrapers and push them with a Cat to get them loaded. They are actually not that bad to operate, one foot on each throttle and away you go.
                      It is a younger mans job because these things can be a petty rough ride.
                      Larry - west coast of Canada

                      Comment


                      • #12
                        Originally posted by aostling View Post
                        The only reference I have found to this is from http://www.ritchiewiki.com/wiki/inde...trous_Machines. I wish we could see a photo.

                        With the development of the Electric Digger series in the 1950s, LeTourneau’s company manufactured the world’s largest motor scrapers.[4] The Goliath, or Model A4, was the biggest motor scraper built to date. This model contained an electric motor in every wheel. Following the Goliath was the development of the LT-360. This scraper, the biggest ever built, included three bowls for a capacity of 216 cubic yards (165 m3). It moved, with the power of eight 635 horsepower engines, on eight wheels that each measured more than 10 feet (3 m) in diameter. LeTourneau’s scrapers never sold in large numbers; they were mostly considered experimental.
                        The book LeTourneau Earthmovers has pictures. Google search 'LeTourneau Earthmovers LT-360'. One of the things LeTourneau pioneered was electric motor hubs on construction equipment.

                        I also recommend the Historical Construction Equipment Association, check it out. http://www.hcea.net/
                        Mike
                        Central Ohio, USA

                        Comment


                        • #13
                          have a look at this as mentioned above

                          http://www.youtube.com/watch?v=ahH7B5-O8Vc

                          Stuart

                          Comment


                          • #14
                            627s are mid size scrapers. 657s are the largest I've seen. Smallest push Cat worth bothering is a D8 - about 300 HP . Largest to the D11. Subdivisions move huge volumes of dirt. I`ve watched 5 631`s ¸working with a D10 double strip 80 acres in a week. Moved about 8 - 10`each lift....

                            Cat, Letourneau, and terex seem to dominate the motor scraper market. There is a move toward pull scrapers behind beefed up Ag tractors - think tandem or triple scraper pans behind 500+ hp quad trac or wheeled 4wd tractor.


                            Youtube has many, many videos of motor scrapers doing their thing....
                            Design to 0.0001", measure to 1/32", cut with an axe, grind to fit

                            Comment


                            • #15
                              I was looking for this video when I posted before. The two engines on one scraper would initially seem to be capable of anything a normal person would want to do. Apparently not.

                              Haven't done the math, how many hp on this cutting edge?

                              Can someone tell me why the rear scraper engine isn't used while loading? In the video it looks like the rear engine isn't doing anything.

                              Always wondered what it looks like when they encounter the fabled "immovable object"?

                              Dave

                              http://www.youtube.com/watch?v=9gAYeyUB7oA
                              Last edited by becksmachine; 09-23-2013, 12:36 PM.

                              Comment

                              Working...
                              X