Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
I had a problem removing my seals a while ago so I posed the question on here, and got the suggestion:"Heating the fork legs in the area of the seals with a heat gun and gently prying the seals with a metal bicycle tyre lever has worked for me in the past".So I tried it, and my seals then came out pretty easily.
They do have a metal core. which from your picture it looks as if you have been cutting in to.I don't know if a hairdryer puts out enough heat. You couldn't use one to strip paint, which you would do with a heat gun.I think you may need to go hotter to get the metal of the fork leg to expand enough to loosen the seals. Maybe someone else will confirm this theory.
I feel you pain on this one but the solution is more heat. There's nothing else to damage with heat except the seals and you're losing them anyway so have at it with a blow torch. I used a larger motorcycle tyre lever (has a perfectly designed hooked end just right for the job). Take your time, apply plenty of heat and they will come out (always assuming you've taken the wire retaining ring out first which it looks like you have).Don't be afraid of using heat when stripping down old stuff (with the obvious proviso that you're not melting something important. It works great with steel parts stuck in aluminium (the seal inner ring will be steel) but even with the same materials it can be the best way to break a bond caused by years of corrosion.
They look normal for a early 750 fork. You will have to heat the caliper and you can use a grease gun to push the piston out.
You need to find out if the fitting on the grease gun will fit the caliper at the pipe.
Multi purpose grease for everything and if you remove the end fitting from the grease gun pipe the thread will screw in about 1 1/2 turns into the pipe fitting hole as it is a different thread and that is enough DO NOT FORCE IT or you wreck the caliper
UK has on/off US doesn't