Product review (5 stars): I love my Manitowocs (IY0524A-161)
If ice isn't always falling off of the evaporator then this or the hot gas valve is normally the cause (usually the harvest assist in my experience). This fits the machine perfectly. Now the ice is dropping every 12 minutes vs 25 to 30 minutes.  ---- I must add, if you are going to replace the machine, don't buy a Scotsman. They are more problematic than any other machine I have worked on (they are also more difficult to clean and maintain). I love my Manitowocs (IY0524A-161). I have 7 high volume fast food restaurants, so I am starting to learn a thing or two.