Hi. Have you had the machine from new? I have seen some machines where the controller has been programmed by a serviceman to restrict its speed for safety. Do you have an high/low switch on the control panel?
It is also possible that the throttle pot ( Wig Wag ), is faulty.
Has the machine done a lot of work? The motor might need overhauling.
Check the current ( amps ) draw on the batteries, the brake assembly might be causing a drag.
Good luck. Neil.
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