JOHN DEERE S120 Mower Electric Pto Clunk
System Nominal
The 'clunk' is the intentional mechanical byproduct of the electromagnetic clutch engagement. When the PTO switch is pulled, the internal solenoid instantly pulls the armature plate across a small gap (typically 0.012-0.024 inches) to mate with the spinning rotor; the metallic impact is necessary for instantaneous torque transfer and is a standard characteristic of the Warner-style clutches used on the S120 series.
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