I'm not a dieselmechanic but I can replace an F-150 engine. So if it's the same, just rent a pulley puller from your local auto parts store and use it. If it's like my F-150, you aren't getting it off without it.
You will remove that bolt and washer, place the puller on top and thread it into the side holes....then crew in the middle bolt. It will pull it.
Since it is my bed time I may be slightly past my best
But, don't you just use the additional holes ( threaded , 1/2 unf or 13mm normally) with bolts to 'raise ' it off the shaft ?
If not threaded- then a nut behind the pully on each bolt ?
Sent from my iPad.......i apologise for the auto corrects !!!
Jeraden, you should feel quite lucky: you have all sorts of room to access that pulley. Neither the removal of the pulley nor the replacement of the seal requires a skilled mechanic. Sailorchik's advice is spot on, as is the advice to acquire a suitable puller for the job. Not a biggie, and IMO no professional oversight is needed.
Give it a go!
Jim, using Ann's computer
Ann & Jim, U.S. s/v Insatiable II, SE Qld, for a while