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This is another continuation of testing the engine idling speed control on new Voith gearboxes. The Voith DIWA.3 gearboxes features an auto-neutral function, just like other series (.2, .3E & .5), but it is active only when the handbrake is applied, which is featured in this video.
Pay attention to the rev-up when the gear is disengaged when handbrake is applied, and the slight drop in engine speed when the handbrake is released.