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This is a 1992 John Deere 870 with about 1300 hours. It is making a humming/ whining sound that seems to originate from the distribution box located at base of steering column. When the whining starts the motor rpm’s also increase any insight would be great.

I recently bought a 1992 John Deere 870 it has 1300 hours on it after owning for 3 days or so and putting probably 8 hours on it i started hearing a whoooo sound accompanied by the rpm’s jumping up. It appears to be happening in all ranges and in all gears it usually happens when accelerating or...