Quote:
Originally Posted by maple_leaf_eh
I have few exact construction details. The literature for a Madill 171 lists the base vehicle as an M4A3, another clearly indicates M32 for a Madill 071. Another user, Finning which made pneumatic rock drills uses the base vehicle in the model designator, ie. Finning M32F Hammer Drill.
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Primary reason for the M-32 carrier designation was to avoid confusion with the first tank drills, which used M-4 high speed tractors. The larger Madill and Tyee yarders used a carrier designated the "M4A3", which was a Dr. Frankenstein thing closer to an M40 SP gun. Widened and lengthened hull, and carrying 60 tons of machine. Several of the so-called "M-32" drills were likely built from Grizzlies and Sextons, had the CDP track. Horrible stuff, most got replaced within a year or two with US pattern track. The last tank drills were "M-40F's" and are not an M-40 at all, they are a typical HVSS Sherman with standard length hull.
Lots of the earliest steel spar yarders were mounted on M-6 HS tractors, converted to varying degrees. Some still retained the original cab. The first tank drill was simply an M4 HS tractor with a compressor on the back and a drill attached to the front. Still had the Waukesha gas engine, even. Later versions were highly modified, with air control for steering, diesel power, etc. Also 10 speed transmissions added.