First, there are 7 variations of your tractor; which one do you have?
Yes, the cylinder is easy to reseal, the seals are available individually, and I don't think there is a seal kit.
For me, it is much easier to remove the radiator and take the cylinder out from the top. It also makes checking and replacing, if necessary, the bushings and pins.
L4200DT Dual Traction 4wd, Rops Tractors / L Series
L4200DT-C Dual Traction 4wd, Cab Tractors / L Series
L4200DT-GST Glide shift transmission, 4wd / Rops Tractors / L Series
L4200DT-GST-C Glide shift transmission, 4wd / Cab Tractors / L Series
L4200F 2wd , Rops Tractors / L Series
L4200F-C 2wd, Cab Tractors / L Series
L4200F-GST glide shift transmission drive, 2 wd