I have an old Scag TURF RUNNER and the Hydraulic fluid cap leaks badly from the top of the cap when I mow... is this supposed to be vented ?? it drips down on the driveway so I can't use it until I fix it... Can anyone help me??? Maybe the pump is clogged...the tracking is off a little ... I changed the filter and still it leaks...where can I get [parts for this... outside this issue, it runs great!! Please Help!!! Anyone!! Thanks "Billykid"