I'm looking to buy my first hydro walk behind mower. It's a 2004 Husky and I know hour wise it's around 300-400. I've noticed that when I drive it is a little jumping and will turn really sharp/quick and just isn't very smooth. I'm not sure if it's just me being new to the mower, does it need the hydro oil changed or is this the first sign of a hydro motor going out? I've only owned belt driven mowers to this point so I'm still getting use to hydro. Any thoughts?