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Draining coolant from tractors

A

ajl

Member
Just wondering how you guys go about changing coolant on the newer tractors. Older tractors have drain valves in the block and rad but on
mine which is a NH 7635 I don't see a drain on either. The last time coolant was changed was when the rad was worked on which was a decade
ago. Seeing as the tractor has to last for a long time yet, it is high time for another change. I was thinking to pull the lower rad hose
off the bottom of the rad but is that enough to get a complete drain of the block?
 
I suspect there is a block drain somewhere. Finding it, getting it out, and poking the passage open may be a different story though...

With the coolant being 10 years old, it will need to be flushed. If you can find a plug in the head, or near the thermostat, and can get it out, remove it. If not temporarily remove the thermostat.

Start the engine, bring the RPM up, hang the water hose in the radiator and let it flow water out the removed plug, or let it overflow the radiator for several minutes until the water is clear.

Then remove the lower radiator hose and let the water drain. That will get the majority of the water out. Replace the plug or thermostat. Then refill with the recommended coolant.
 
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