I have just started with a problem with my H1502. Has run great for years, started it the other day and went to drive it out of the barn and it didnt want to move easily. Forward was a bit of a struggle and reverse was much worse. Hydro with a foot pedal for operation. Makes a fairly loud whine only when in motion. Fluid seems to be fine on dip stick, cleaned the hyd. screen, barely dirty, changed the hyd. filter. 3 pt. hitch very sluggish. Will go down comes back up 2 minutes later. Operated fine one day, next day this, am I missing something? Only has 874 hrs. Is there only the oil fill that is under the seat? I have no manual.