Assuming you are using puller? Put some grease in first then the puller. Tension on and leave sit for a bit. Tension on and warm up with a propane torch.
as said some grease on the tip every time you use the puller is best. But if someone has over torqued this clutch on I would recommend putting the sled on its side and pouring gear oil in ahead of the puller put in enough so you can get AT LEAST half
of the threads threaded as when the puller is bottomed out. some teflon tape on the puller and start cranking on it. The mess is not to bad bc you dont have much oil in there but next to no friction and the hydraulic pressure will pop it off.
grease on tip of puller as stated and rattle the puller on with a decent impact gun......If no gun hammer on the end of the puller a few times try to tighten hammer tighten etc.... she will come off its only a 13 cant be seated on there to bad