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Elsewhere on this site we have featured the LeTourneau log stackers which are electric drive. Historically they were not without competition. Both Kenworth and Wagner made hydraulic models. this is a FWD Wagner model. Now Wagner hasn't been around for 40 years but their machinery still is. This machine is alive and well in 2007, but was likely made in the 1960's. To be sure the Wagners are fading into history but these are still alive and kicking. This pulp wood yard has two of them. They have one feature not found on many other machines. They have 'kickers'.--a set of vertical teeth hinged at the top that can be used to scrape the logs off the teeth.
These machines were made in several sizes with the smaller one being a true tricycle with just a single tire on the back. This larger model has tires on the back close together, and they will turn nearly crossways for very short turning. The typical engine is a Cummins mounted almost under the cab with an Allison transmission. The front axle is the only driving axle.
The winter series of photos came to me in the Winter of 2009 from a Canfor mill in Radium Hot Springs, BC where several machines were operating.
See also:
I have now received information that http://www.alliedsystems.com has the manufacturing rights to the Wagner stacker and is making them here in Oregon, though I have yet to see one anywhere.