18-27 Row Crop Single Front Wheel
The Oliver Chilled Plow Company was very close to releasing there new line of tractors when the merger took place. Now with this new tractor design, the newly formed company had most of the research work behind them and proceded forward with the release of the new ROW CROP model. This new design started a new era of manufacturing at the Charles City plant.

The new ROW CROP went into production in February of 1930, it was the first model of the three to be introduced in 1930. It featured a four cylinder Waukesha valve in head engine. The front steel wheel was of unique design being of concave shape This single front wheel combined with the fact that this tractor had no turning brakes provided a challenge turning in loose soil with an implement in tow. Then late in 1930 at approximately serial number 102130, turning brakes were added to the rear axle. Many earlier Row Crops were field equiped with these add-on turning brakes, which helped a great deal for turning. In 1931 the dual front wheel Row Crop appeared and these tractors featured differential shaft brakes to assist in turning. The engine in the Row Crop tractor was a valve-in-head design built by Waukesha. Actually, the engine blocks with the name HART-PARR cast into them were manufactured in the Charles City plant, the heads were made in Milwaukee, Wisc. and then the blocks and heads were shipped to Waukesha for assembly and then back to Charles City. With the introduction of the Row Crop also came the introduction of the famous "Tip Toe Wheel". This proved to be a good invention and traction usually was no problem with this style of wheel. It was a simple idea with lugs bolted on either side of a band of 9/16 wide steel. With this style, compaction was to a bare minimum without sacrificing traction.

One unique feature on the first 350 Row Crops built is that they used a cast iron air cleaner cover. I'm sure some of these covers got broken over the years and were replace by the tin cover as used with the dry type air cleaner. Two different drawbars were used on the single front wheel Row Crops. The earlier ones used just a plain drawbar, but on the later ones a tool box was incorporated into the drawbar, which made it handy to store tools and drawbar pins.

18-27 Row Crop Dual Front Wheels
The dual wheel Row Crops appeared in 1931 and were a huge success. You can notice that the two front wheels made the tractor longer, but was easier to handle. As the single front wheel models, they had the unique system for attaching front mounted implements to the tractor which had been developed by the Oliver Chilled Plow company. This system was known as the "pipe frame system". Two cross pipes was placed in holes in the front frame of the tractor and you could attach either a cutivator or planter. Also available was a PTO and was driven by the same power train as the belt pulley. The words Oliver Hart-Parr were prominently cast into the upper radiator tank of the tractor. From 1930 to 1933 the words Hart-Parr were in large letters and the word Oliver in small letters. Then in 1934 the size was switched around to make the name Oliver more prominent.