Jim: I'm not sure you resolved this. What serial numbers were the last Service Products fans used, both SA and SC. You are presenting us with a water pump fan and non water pump fan for the Schwitzer-Cummins. Why would one brand do all yet the other brand required two separate fans.
Looking at my SA fan the pitch is much more agressive than 130 and 140. Driving the three tractors I quite regularly feel the breeze from SA fan. Very rarely have I ever got a breeze from 130 or 140 fan. Now, I realize the 140 is a whole different setup. Given the fact that SA sheet metal is 2" closer to chassis, I would expect that to block air flow somewhat to operator platform. There could also be another factor, my Super A is one of the roughly 20,000 SA with pressurized thermosyphon.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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