One disadvantage of an engine-mounted fan on an engine that has isolators between it and the frame is that the fan tip clearance must be large enough to account for the engine movement. With electric fans the blade-to-shroud clearance can be held very tightly which increases the fan's efficiency.
Hydraulic fan drives are becoming more common on ag and construction equipment because they provide the variable-speed benefits of electric drives but with far greater power capacity. When you consider that a typical off-highway engine puts about 10% of its power into driving the cooling fan it becomes obvious why normal 12V electric drives aren't suitable for these applications.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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