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John Deere Tractors Discussion Board

Re: Old 531/619 any relation to the new 12.5 ?

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Posted by jturbo10 on December 07, 2012 at 09:58:17 from (

In Reply to: Old 531/619 any relation to the new 12.5 ? posted by buickanddeere on December 05, 2012 at 06:22:40:

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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