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I will pass on my experience with driveshaft fans. I've owned a few different CC's over the last 50 years. I replaced the plastic fans a few times. and finally gave up. Mostly because I didn't notice when they broke a part and ran just fine without one. I've mowed my large yards in 90+ degree days. I've scraped dirt (I called it land scraping) with the blade until the muffler was red hot. Pulled heavy trailers, none running cars and trucks. Blow snow for myself and some of my neighbors. When my son was young and mowing our 5 acre yard, he cut dandelions until the head fins plugged with seeds, presumably over heated, and broke and a rod (I was at work). The fan less hydro never failed. I do have the habit of letting my CC's idle after working them hard, with the hood open, to cool down some before shutting them off. I have no idea if that benefits the hydro or not. I do change hydro fluid and filter from time to time but, not on a regular basis. As I stated at the beginning, this is my personal experience, others may have had much different results.