RIDING LAWN MOWER CONVERSION
RC Mower Project Page 8 (Gear shifting).
A large scale servo was added to the mower to take care of shifting the gears. The shifting system is easy to setup. First mount the large scale servo so it is in line with the shifting lever. Then add linkage to the lever and place the shifter in the center of it's needed throw. The linkage should be cut so it is in the center of the servo output shaft. Then move the servo to it's full throw (using the transmitter) Then move the shifter to it's full throw needed in the same direction. At this point you should be able to get an idea of how long a servo arm you will need. It is a good idea to make it longer and trim it down after you have the linkage setup and working right. On my mower the linkage is setup so that turning the AUX channel knob all the way to the left, shifts the mower into reverse. Turning the knob all the way to the right shifts the mower into 6th gear.
You can view the images and details below for more information.
Here is a look at how the shifting is done.
I setup the AUX channel for shifting and used a large scale servo to shift the gears. The servo is rated at 27 ft. lbs of torque. So, it has more than enough power to do the job.
When the system is on the AUX knob is turned to select the gear.
The system must be in neutral in order for the engine to start.
I have marked a shifting plate so from a distance I am able to tell which gear the mower is in. In this image it is clear the mower is in reverse.
Here the mower has been shifted into 6th gear.
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