I always thought it was weird that the K72 didn't have a screw-on filter too, but I think the Cub Cadet shaft-drive's are the only medium-duty garden tractor that have one.
Yeah, I thought it was funny our old MTD that we bought the x 500 to replace has a full size screw on hydro filter and also has a reservoir that looks to be about 3 times the volume of the K72 plus it is also divorced from the hydro unit which may be better at dissipating heat.
Today I needed to weight roll our driveway after spreading some 3/4 minus with the Rhino tractor and box blade.
Figured it would be nice to use the x500 to pull the roller.
So I modified a generic short receiver from HF and mounted it up with three 3/8" bolts and also turned a nut down to the ID of the existing hitch hole and then MIGed it on along with a center upper L bracket.
If the receiver comes loose, my guess is the Hydro will be toast long before the hitch comes loose.
The roller is a "Manual" unit from my FIL's old landscape company for seating "Green side up" sod that we were given years ago.
I added rubber suspension bushings and then just bolted through them and a couple washers and It works well for taking a bit of shock out of starting or stopping.
After a bit of use found the roller was leaking so I drilled out the leaking areas and then plug welded them shut after purging the inner airspace with Argon CO2 mix, and almost full of water Not taking a big chance when welding on a vessel that has much internal volume.
The under Hood fiberglass repair i did is bugging me and the cracks really detract from the mowers overall condition, so if i have some extra time tomorrow may try and do a little body work and see if using Fizz can Van Sickle JD Green to the the hoods plastic casting line can improve the looks a bit.