Error Code 66 John Deere 990

Model : 990

How to fix ?

Lift the seat to inspect the battery and if you have loose cables, tighten them using an open-end wrench. To clean, remove the negative cable first and use the brush to remove any built-up corrosion. Then, reattach the cable and attempt to start up the mower again.Dirty fins keep the radiator from being able to lower the temperature of the coolant effectively but make sure you don’t bend any of the fins while you’re cleaning it off.

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Deere & Company began industrial equipment production with a modified version of the model D, including some sold by Caterpillar. Deere steadily added additional indsutrial equipment to their farm machinery line, and had a full line by the 1960s. Today, Deere & Company is a major manufacturer of construction equipment.