Several things that I noticed from your pics.
a. The seat switch and the support ring that it is mounted into are missing.
b. The seat support is missing the two springs that hold the seat off the seat switch when no one is on the seat.
c. The maximum front caster tire size for a 61" Tiger Cat is 13X6.5x6, check the tires to see what size they are.
d. The part number marked in red on the R/H front fork tells me that this is a replacement part. I wonder why it was replaced, possibly the PO had an incident with this machine and bent the original fork and possibly the front support, the weldment that holds the casters, may be bent causing the R/H front caster tire to come in contact with the anti-scalp wheel on the deck.
If you purchased this machine from a dealer, I suggest that you return it to them and ask them to restore it to the original configuration or return your money.
With no seat switch, this machine is a safety hazard to the operator.
Not only has this machine been "butchered", but it may have been damaged from an accident that involved the front suspension and possibly the machine frame and/or the deck. If the machine frame is bent in any way, then you will never be able to get the deck leveled correctly.
This machine may have more "hidden" problems that could haunt you later on.
Just my thoughts!!!