I just bought a 54" Fastrack SD. Are the spindles greasable? I do not see any zerts, I guess they are self-contained? Also when I engage the blades the deck seems to vibrate more than I expected. I do not remember if it did this when I test drove it. I just noticed it today after engaging the blades. I have just under 4 hrs on it. It appears to be the belt tensioner that is allowing the excessive vibration. I tightened it one chain link, and it seemed to help. I've only have two more links I can tighten it. Should I leave it be? In the instruction manual it mentions purging the hydraulic system when I change the fluid, how do I go about this? Thanks for help!