Hey all, I have a 9 year old (about) Bobcat XM Hydro walk-along mower. I purchased it two years ago off of a landscaper who took excellent care of it. I've got two questions: 1. Recently the blades slow down extremely easily when I hit the slightest clump of grass. I'm assuming it's the belts that need tightening or something similar. Does anyone know which belts to tighten/replace? 2. How often should I change the hydro fluid? Thanks a lot!