i have a 2005 exmark navigator with 35 hours on it.. there is a knocking noise at idle and a little above comming from the area of the hydro pumps. you can notice it when driving at low speed working the left lever.... its not real loud but it can be heard easy enough long as you are not running mower deck... i read the manual and it said could be air in system or clogged filter so i changed the filter and tryed to bleed the air the way the manual said, no change in noise.... i don't know...
2005 exmark navigator pump knock
2005 exmark navigator pump knock