Throttle Position Sensor for Cub Cadet Ultima ZT1 42E
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Upgraded throttle position sensor design for Cub Cadet electric zero turn mower.
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The original factory design of this sensor is plastic on plastic which works ok until dust inevitably works its way in and makes the action very gritty. This results in poor handling and control, and in my case, completely seizing up and breaking the senor arm. This is my solution. It utilizes a sealed ball bearing so dust shouldn't have any effect. It is also much tighter and smoother than stock which makes it respond better to inputs.
The necessary hardware for each sensor assembly is:
1x 6702-2RS 15mm x 21mm x 4mm ball bearing
2x Stainless M3 nylon lock nut
2x Stainless M3x30mm screws
I recommend printing both the bracket and the arm with 15 perimeters which is effectively 100% infill
Procedure:
I jacked up the rear of the mower and removed the tires. Disconnect the linkage that connects the lap bar to the sensor. There are then two screws holding the sensor assembly to the frame of the mower. Take those out and disconnect the electrical connector. The assembly can then be taken to the work bench for the rest.
IMPORTANT! At this stage, snap plenty of pictures along the way to help for later reassembly. This is important as the orientation of the encoder (which way the wires go) is crucial and can be accidentally reversed! Best to just match the original than have to guess and check on sensor orientation later!
Remove parts until down to the original bracket and arm.
The magnet from the old sensor will need to be used. Mark an arrow with a permanent marker on the exposed face. Take a reference picture for later. Use a 1/16" or similar drill bit to drill from the back to push the magnet out. Match the orientation to the previous photo and press into the 3d printed sensor arm.
Press the ball bearing into the 3d printed sensor bracket and then press the 3d printed sensor arm into the bearing. Reassemble the sensor assembly. Use the disassembly pictures to get the encoder installed with the wires going in the correct direction! Reinstall on the mower. Run the lap bar calibration procedure.
I have included the .stl files as well as the Fusion design files.