That is typical,buy some of the hydro oil and add a little,then check.....repeat this til it goes to the right level when not in use.This apparently happens as the hydros essentially suck up the lubrication they need. You got a sweet mower,it takes awhile to get everything fine tuned.I'm a satisfied owner now that the hazing period is over!:laughing:
From my experience the rattle (when blades are engaged) comes from too much play in the spring.I don't like the shaking but too cheap to buy new spring which apparently is much more robust with more tension.This is on my "to do" list.My mower continues to be a workhorse,I'm a Happy Hustler owner!:thumbsup: