using to factory tool is easiest but not essential, as you look into the end of the spindle it looks like an hex key fits but just below that there is a thread (imperial) find a bolt that fits.
I used a normal flange puller to pull off the pulley but make sure you protect the thread, do your repair and to re assemble the pulley a longer bolt, a nut and plate with a hole in it, wind on the nut all the way to the bolts head, then push the bolt through the plat and then the pulley, screw the bolt into the hex hole in the shaft as far as you can the holding the bolt head in one spanner wind down the nut till pulley is refitted.
or do what I did and buy a pump from a renault clio mk1 1.4l 8 valve, pull the pump out of the reservoir and put it in the Jeep reservoir, £16 for clio pump on eBay was cheaper than a seal kit