1999 e580 gem only goes 18mph

i just purchased a 1999 gem e 580 and love it. but it only goes 18mph top speed. all the other forms i am reading says it should run 28 mph is this correct ? if so any ideas what might be wrong ?

You might have them Forward / Reverse switch set to Turf


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the turf and road switch makes about a one mph diffrence but i have it set on road