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The Hawkeye Motor Patrol was a grader based on the John Deere Model D. It was an idea from the Hawkeye Maintainer Company of Waterloo Illinios.
A document from May 27, 1927, says that rubber tires for a one man grader had been adopted by this time. The tire sizes were 32x5 (front) and 50x10 (rear).
The first tractor that Deere provided to the Hawkeye Maintainer Company was Model D #72074. It was shipped on either November 11, 1928(Forty-Twenty.com) or November 12 (Green Magazine).
According to a decision made on January 7, 1929 the Model D would be fitted with special parts for use on the Hawkeye Maintainer...
- Fuel Tank 10 inches longer, with a capacity of 30 gallons
- With use of a pipe and elbow, oil filler is located on pulley side of tractor
- Brake extensions, to bring emergency brake within easy reach of operator
- Hard rubber tired wheels, instead of steel
| Serial Number | Ship Date |
| 72074 | 11/12/28 |
| 72140 | 11/19/28 |
| 74610 | 01/11/29 |
| 74611 | 01/11/29 |
| 74836 | 01/16/29 |
| 74837 | 01/16/29 |
| 75032 | 01/21/29 |
| 75033 | 01/21/29 |
| 75347 | 02/07/29 |
| 77895 | 03/05/29 |
| 77896 | 02/21/29 |
| 79148 | 03/07/29 |
| 82890 | 04/26/29 |
| The above information is from Two-Cylinder Magazine | |
In July 1931, a group of 11 Model D tractors were shipped to Royer Manufacturing Company of Janesville, Iowa on July 18, 1931. These were serial numbers 115222-115232. They were equipped with 32x6 (front) and dual 42x9 (rear) high pressure pneumatic tires. They were made into Motor Patrols, and shipped to the Nebraska Road Department.