John Deere 4640 block heater

Al nickel · Mar 1, 2021

The block heater on my 4640 gets warm rather than hot like it does on my 4440.The 4640 also does not start as well in cold weather like it used to. Can a block heater on its way out begin to heat partially ?? This is a new experience for me.

wore out · Mar 1, 2021

(quoted from post at 08:14:07 03/01/21) The block heater on my 4640 gets warm rather than hot like it does on my 4440.The 4640 also does not start as well in cold weather like it used to. Can a block heater on its way out begin to heat partially ?? This is a new experience for me.

I've never encountered a "weak" block heater, either, but that doesn't prove it could never happen.

Two thoughts, is it possible they are from different sources and not the same wattage?

It would be easy to confirm a different Watt draw with an AC Ammeter or a Wattmeter, such as can be used to check appliance power draws when doing an efficiency audit.

Another thought is that the 4640 has a thermostat that isn't fully closing so the warmed water continuously circulates through the radiator and the block and heater never get as warm as the block and heater in the other tractor do.

coonie minnie · Mar 1, 2021

It happens. It's time for replacement. Sadly, I had one do that after only two months use. So then I get to drain the coolant again, hope it doesn't leak again... in a lot of ways the tank ones (external) are superior.

sandcastle1 · Mar 1, 2021

are they the same wattage? I have replaced several that have burned out, they all have gone from working to not working. I replaced the 1500 watt heaters that were there with 1000 watt heaters as I have found the lower watt heaters to last longer. My payloader has had the most replacements in it, not really sure why but those did not last well.

fixerupper · Mar 1, 2021

Is the power supply to the heater adequate? Same adequate sized cord used for each tractor? I had a good sized battery charger and a block heater plugged into the same 100 foot long 12 ga cord and the block heater didn't get warm enough. The cord was not hot but it just wasn't adequate for the load I was demanding from it. A shorter 50 or 25 foot 12 gauge cord probably would have handled it OK but there was too much voltage drop in that long of a cord. This was a semi tractor.

fastfarmall · Mar 1, 2021

My pick up acts the same way, sometime there is no knock or pounding, next time it got the internal knocking sound, leading me to believe it's only heating partially!

wore out · Mar 1, 2021

(quoted from post at 11:24:18 03/01/21) Is the power supply to the heater adequate? Same adequate sized cord used for each tractor? I had a good sized battery charger and a block heater plugged into the same 100 foot long 12 ga cord and the block heater didn't get warm enough. The cord was not hot but it just wasn't adequate for the load I was demanding from it. A shorter 50 or 25 foot 12 gauge cord probably would have handled it OK but there was too much voltage drop in that long of a cord. This was a semi tractor.

GOOD comment as to using an adequate extension cord.

Gets even more important of the "run" from the outlet to the tractor is long.

John Deere 4640 block heater

Al nickel

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wore out

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coonie minnie

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sandcastle1

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fixerupper

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fastfarmall

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wore out

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