Riding Lawn Mowers

I have a model YTH2348 with only about 20 hours which I purchased new about 3 years ago, but assume the deck adjustments are very similar.  Because of my experience with a couple of larger John Deeres, I dropped the deck, changed to mulching blades and remounted.  I don't use a Mulching Cover to contain the clippings.  The blades cut well and discharge almost no clippings without the cover.  Found that to be a pretty simple process.  While the deck was off, I greased the Spindles generously and squirted 30W oil into the Idler Pulleys and wiped them off.  After remounting, I leveled the deck to 3" as a base height (using a Stens Leveling Gauge - simplest way to verify blade height) by adjusting the front leveling screw first.  Then adjusted the left followed by the right side.  The nuts on the levelers are tight but I suspect they are similar to a Nylok style nut to prevent them from loosening due to vibration.  Next, I relocated the (4) rollers provided to prevent scalping.  As part of the maintenance, I had changed the oil, oil filter, cleaned the air pre-filter with mild soap and water (dried it), vacuumed the paper filter and changed the fuel filter.  Lastly, I checked the fasteners from the front bumper to the the rear.  Frankly, I had expected to find something loose, but that was not the case.  Hope this helps.