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Isaac Enjoys His Tractor

| September/October 1990

  • John Deere

  • John Deere

  • John Deere
  • John Deere

5166 S. Vine Wichita, Kansas 67217

Isaac, my grandson, who is seventeen months old, is too small for the other tractors I have built. I decided to build a tractor small enough so that he could drive now and yet grow into it later. Most of my Fun Scale tractors are red, so it was time for a new color. After much thought the color green came to me. I have wanted an unstyled John Deere B for a long time so that settled the type of tractor. The size works out to about 1/4 Fun Scale; this is about as small a tractor as can be built and still use pneumatic tires.

I felt that a gasoline engine had too much power for a little guy like Isaac, so the next choice for a power source was electric. The biggest problem was finding a motor big enough to have good power and still fit in the frame. After much searching in car salvages the only motor I could find was an electric fan motor for the radiator. Several fan motors were tried but only one was felt to have enough power to do the job. I do not know what kind of car the motor I used came out of, because it was lying on the ground when found. This motor is what I call a pancake motor. It is very well built with ball bearings on both ends of the shaft and four brushes. Maximum current draw is about 40 amps stall at 12 volts.

With the motor problem solved, a control system had to be devised. A motor reversing switch was ruled out because of complexity. I thought about using a three speed transmission but felt it was also too complex and too heavy.

The next option was a forward reverse gear box from an old riding lawn mower. This gear box gives some speed reduction and will be a good shift trainer as Isaac grows older. Speed control is obtained by using a nicrome coil resister for low speed and direct connection for high speed. A garden tractor battery is used to supply energy for the motor, duration of the battery is over an hour and a half with a 50 pound youngster driving.

A small riding mower differential was used for the final drive and rear axles. The rear rims are from 8 inch wheelbarrow wheels. After cutting out the centers, a hub and spokes were welded in, then 4.00 x 8 inch tractor tires were added. For front wheels, 2.50 x 4 inch tires and 4 inch rims were used. The frame is 2 x 2 x Ā 1/4 inch angle iron. A motorcycle seat was cut down for a seat. Steering gears came from a self-propelled lawn mower transmission. The steering wheel was bent from ? inch conduit on a tool I built.


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