I got a 04 exmark viking with a leaking seal/gasket on one of the hydro pumps. Its leaking where the main body joins the head part with all the hose connections. It never leaked before until I saw it today before I started it up. Is there a user replaceable gasket/seal? Exmark sells an "overhaul seal kit" is this what I need to fix this leak. If I take the head off the pump body, will any parts jump out?