3700 crank pulley

Is there something about the 3700 crank pulley
that i'm not aware of as far as using a puller on it
to remove it,been patiently trying since yesterday evening
with air impact and lots of parts blaster,still no luck.

They sometimes require a 10 ton puller and you MUST pull with three 7/16" grade 8 bolts from the center hub. They are on a tapered crankshaft nose and are T-I-G-H-T  !!!!!

I have 2 that I want off and the one on the 3500 tractor
motor popped off pretty easy but the one on the 3700 hasn't
budged yet.Have hit it with a hammer as suggested and also checked for the set screws mentioned and didn't see them anywhere.I still have pressure on the puller and been spraying it with parts blaster,they must be mated for life LOL.
I'll just keep trying I reckon til it pops loose.

I always leave the crank bolt two turns loose so the washer will catch the pulley when it breaks loose. I have used a torch to carefully warm up the inner hub in a small area and had things finally pop and let go.

The cast puller I WAS using just broke in the middle.
Pulley one,puller zero.
Can you use a 3 finger puller on this pulley
and pull on the pulley instead of screwing the bolts in it.

I used a 3 jaw 12 ton hydraulic puller from harbor freight on the one I took off our L2. I made adapters to be able to bolt the puller arms to the pulley. It took all 12 tons i think, but it broke loose. Good luck

Worked on the engine swap some today.
I'm going to switch the heads on these motors
and lifted the valve cover off the 3500 engine and got to
looking at things and noticed the hex head bolts in it,hmmmm.
I was told those were either a 3/4 or 13/16 hex bit ok.
I went to town to look for those since I didn't take time
to find out for sure and I wasn't to surprised to find the 3/4
hex bit but it was in a set at lowes' but never did find a 13/16
any where so came home and looked them up and found them both made
by titan,they will be here Saturday.

There are 5 hex head bolts down the middle of the head,
at least on 3500 engine.

They are head bolts.       MACK

Thank you Doc.

So now another question.I know the simple thing to do is just get some 3x5 angle iron and make some dog ears to bolt the front of the motor to the frame and I know it would it work fine but!!!!!!!I would rather change the front deck plate.
I have looked at these 2 motors and pumps and the 3500 has the DC pump and the 3700 has the DM pump,so the DM pump will not work with the front deck plate off the 3500,so with that being said,could I not maybe find a front deck plate off a 7060 with the dog ears and just replace it with the one on it now and be able to use the DM pump that way.