Hydrostatic transmission there is only one throttle setting and that is WFO. if it is running slower than it used to, and the drive belt is snug, then you are looking at a failing transmission.
your trans may not be failing i had the same problem you may need to get the air out of it or bleed it just google the type of trans and you will find plenty of links, also you will probably start having drive belt issues these mowers are problematic in these areas. I have one, the pulleys are good and once a year i have to put on a new drive belt.
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Some self-propelled mowers include a speed control, but sometimes it may seem that no matter how you adjust it, the mower just creeps along at a snail's pace. Most likely this isn't a mechanical malfunction, but an adjustment is probably needed.
Very tall or thick grass can bog down a self-propelled mower, but adjusting the height of the blade may allow it to roll through and cut the grass at normal speeds. If the blade is low, the amount of cutting required may slow down the movement of the entire mower. The frame of the mower may also stick in the high grass. Raise the blade little by little until the mower rolls at the appropriate speed. Going up hills may cause a similar response.
It's possible the drive belt on the mower can slip. Inspect this part to see if it is loose or cracked, and replace the belt to restore power.
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