a long 3/16" pin punch and put about a 20deg bend about 1-1/2" up from the tip. other option is Part# 110567 (crown tool) about $46. They work but are junk. Only last about 1/2 dozen load wheel changes and they either bend or fall apart. Option 3 is a BFH an a BF-punch. Drive the axle out breaking off the roll pin and replacing the axle with the roll pin.
Option 4 join the forklift mechanic FB groups and ask about crown load wheels. You will get about 300 replies within 30 min with Crown load wheel jokes!

Load wheel issues.my best advice is good set of roll pin punches, good penetrating spray, small propane torch, and patience.took me twenty years to learn the patience part lol good luck bro

6mm might be Yale... anyway you want a punch that fits exactly, a little too small and it will expand the pin.

Nothing beats standing up when doing load wheel roll pins. If you trust your driving and the truck is in good working order, I like to drive the forks off the dock and lift to full height. Also, the exact size pin punch matters. It might be 6mm on Crown.

I suppose you are removing them from the top with the risers closer to the forks?? I like to bypass limit switch ( if equipped) and press raise button, with the riser away from forks place your roll pin punch at the end closer to the forks.... all this while both forks jacked and secured under blocks. Hope this helps!!