Adjusting loader relief: Massey 1648 (same as Iseki TG5470) ?

[TSO]

I think the TG5470 is the same as the Massey 1648 (or maybe it's the Massey 15xx series ?)

Can anyone show me where to adjust the hydraulic relief pressure?

I've heard that a 10% increase in relief/pressure does wonders for the loader lift. I'm not looking to add capacity regularly, just could use a little more lift once in a while when moving pallets.

Thanks in advance