The gears I've had to pull all had 2 tapped holes for use with a steering wheel type puller. You could try drilling and tapping 2 holes if there aren't any there allready, otherwise buy/borrow a different puller and maybe heat up the gear.
When you get this far, have the machine shop drill/tap the end of the crankshaft so you can draw the balancer onto the crank, instead of trying to beat it on with a hammer.
