AH131320 Switch (speed sensor) John Deere (Help Parts)
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AH131320 – Low speed shaft sensor/magnetic switch, John Deere
AH131320 is a magnetic sensor (or switch) mounted on the lower shaft of the header rotor and other shafts of John Deere combines. It is responsible for monitoring speed and transmitting signals to onboard control and diagnostic systems.
Main features:
Type: Magnetic switch/inductive sensor
Suitable for: headers 918, 920/920R, 922/922R, 925/925R and combines of the CTS/STS series 6620, 7720/21, 8820, 9400–9880
Advantages:
Accurate measurement of shaft speed – for proper operation of the header control
Easy installation: installs in a regular place using a connector and mounting holes (two mounting points)
Summary:
AH131320 is an essential magnetic sensor for monitoring the speed of the header rotor shaft and other shafts of John Deere combines. It ensures accuracy, stability of system operation, and protection at low speeds.

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