I have a 1641 and a 1863. They acts the same as yours. I have used the 1863 since new, it was my Dads. It has always operated as you describe. It is the way the Hydro gear transmission operates. They act nothing like the older ones.
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1572, 1864 x2, 1810 x2, 1863 & GT1554(Dad's Ole Mowers), 1811,782D, 1872 x2, 782DT(Sold), 3235, 1860, 1772 with 3-point and Turbo.
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