Hi, I'm hoping someone can help. I'm replacing the ring gear on our linde H45D serial H2x394w04333 year2008, vw engine due to the starter rounding off the teeth. I have everything unbolted but can't seem to remove the hydrostatic drive unit. I can pull it back about 10mm and it won't come any further I thought it was splined and would just pull off but I can see the rubber coupling inside the bell housing bolted to the flywheel, does this need to be unbolted somehow? And advise is appreciated. Thanks Rob.