Have a John Deere lt180 automatic with 42" freedom cut deck. Has about 200 hours on it. Yesterday mowing as usual and all of a sudden a grinding noise started underneath the seat. It happens each time I press the forward pedal and I don't think I would move forward much at all if any. I was worried I would do further damage so shut it down and pushed into barn. It doesn't happen when pushing the reverse pedal. I can go backwards it seems ok. Also, when I push the clutch pedal in on right side (pedal pushed when starting mower) the grinding noise happens but will stop if let that pedal go back to its rest position.