BUTCH'S ALLIS CHALMERS
ALLIS CHALMERS WD
When the "WC" ended production in 1948, the "WD" succeeded it. The new model looked like its predecessor, but there were so many new features and improvements on the "WD" that the sales force had to learn a whole new set of terms for the tractor. Two-clutch power control, single hitch-point implements, traction-booster, and power-shift wheels were all new features. The two-clutch feature allowed the operator to stop the drive wheels while power continued to the PTO (power take off) operating implements like combines and balers. The power shift rear wheels allowed the "WD" to move its rear wheels away from or closer to the tractor for different row widths without jacking the tractor up off the ground. Power shift worked by engaging spiral rails on the axel and was a big hit with farmers. The "WD's" 24-30 horsepower allowed it to pull three plows. Over its six years of production, the "WD" sold over 145,000 units.