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Deere 4420 Straw Chopper Slow Shaft Speed Indicator Issue
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DeerePower1
Posted 9/14/2021 22:26 (#9220820)
Subject: Deere 4420 Straw Chopper Slow Shaft Speed Indicator Issue



I installed an early 4400 straw chopper on my later 4420 combine.

When I engage the separator and bring the machine up to full separation speed, the slow shaft speed light does not turn off.

I installed a new shaft speed sensor from the Deere dealer and verified the wiring was ok by grounding both wires that the go to the sensor to the frame.
I have roughly 1/8" to 3/16" between the magnet and the sensor and get 47ohms when I have the magnet right next to the sensor.

Is there something else I should check? Or do I need to add a second magnet to the straw chopper shaft?

Is there an easy way to check the slow shaft sensor box for that location?

Thank you
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