I had the mulching kit on the 60" MMM on
the 4115. Good job of cutting EXCEPT, alot of blowout and
clumping during the early season when grass needs to be
cut every 3-4 days (twice per week).
I added a makeshift baffle to the left front edge of the deck
that wrapped around to the left side - problem solved. I used
duct tape and the black, vinyl (wall) edging that you put around
tile flooring.
Only problem is you have to be careful not to snag it when
mowing. The wife snags it and loses it (probably chopped by)
first time out - AND never knew it!
I switched to Gator blades, but I had to use a die grinder to
grind away two of the mulching baffles underneath the deck for
blade clearance.
Gators did a much better job except the blowout from the
left front side was terrible - it would cover the left
side; build up on the top of the deck; and worst, it blew
back and would cover you. I looked like scarecrow man
when I finished mowing.
Numerous complaints to the dealer, but nothing resolved.
Traded in the 4115 for a 3520 with the 7-Iron deck.
Haven't used it yet.
I bought a Grasshopper 928/D2 front mounted mower
last spring with mulching kit - cuts like a dream even
at petal-to-the-metal speeds.
Reclaiming the last section of land in mid-May with the
3520 and will seed. Since this area is part of the wetlands, it
does get a little wet. The Grasshopper would get
stuck back there, so we use the JD to cut with there.
I looked at doing a 62MMM drive-over to the 4115, but
decided just to go for the big-boy 3520.
The design of the 62" MMM looks very good - JD overcame
alot of complaints I had with the old 60" MMM. The new
deck is deeper from side-to-side which means less blowout
among other things.
Good luck. Post what you end up doing.
Cheers,
Lon