I am assuming that it is the left side that is freezing up? Is there a large disparity in temperature from the left side to the right? Your machine monitors the temperature on the right side hopper and that will determine the temp of both sides. If there is a large temperature difference between the two sides then it may be that you are low on refrigerant. You may have enough refrigerant to cool the left side but not the right side and since the machine only monitors the right side, it wont shut off the mix refrigeration system which could cause the left side to freeze up.
SOURCE: need to know how to clean the taylor soft serve
http://www.taylor-company.com/
go to this web site and just click on operators manuals. Then either enter your model number or you can use the drop down menu.
SOURCE: we have a 2 flavor
Faulty compressor contactor,faulty power board or compressor has burnt out.
SOURCE: Taylor Y754-27 Soft Serve Ice cream machine
Gearboxes definitely go bad. The first sign is usually noise, I would describe it as a rumbling. The best way to determine if it's the gear box is:
1. empty and disconnect machine from power.
2. remove the freezer door and beater assembly
2. remove the rear panel - 4 screws
3. Remove the belts on the noisy side
4. Spin the big pulley and listen for the noise, you may want to remove the belts on the quiet side to compare the two.
I have a video that was shot to help change the hex coupler, but you would follow all of the same steps to replace the gear box.
Email me if you need a part or more help. 
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