I am planning to change the coolant and flush the cooling system on my JD 6415.
The owner's manual says to turn connect/disconnect control "anti-clockwise" as far as it will go.
After two flushes, and final refill with coolant, running to operating temp and adding coolant to the maximum line, the manual says to turn connect/disconnect control clockwise as far it will go.
I am just curious what the connect/disconnect control does? It must be only for coolant flushes, but what it does is a mystery to me
Key 22 is the connect/disconnect control, key 20 is the drain valve.