There are pro"s and con"s for camshaft driven waterpumps and I"m sure JD engineers did a lot of analysis before approving the concept. I personally like the no-belt water pump, however, I subscribe you might want to consider using a time line replacement strategy. Like in airplanes, we replace certain line items based on time/cycles rather than when broke. If you wait until you actually hear the bearings squeak or see antifreeze in the oil it could be a costly engine overhaul. My JD 4450 water pump had a slight squeak when it was first started during hay season. I shut it down at the first sign of water loss in the radiator. I was very lucky as the bearing case was intact when I put it in the shop and replaced the water pump. Don"t know what is an appropriate hour to automatically replace a cam run water pump but maybe John Deere has some data on time-between-failure stats on their water pumps. Since water pumps are about $450 to replace many people will not replace before failure. Maybe something around 4000 hrs or 5-6 yrs which ever comes first is a starting argument point. JMHO
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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