Roosa Master injection pump.
 

Does any one know anything about a Roosa Master injection pump. i'm looking to turn the pump up if any one knows if you can do that or not.

You can take the top-cover off the pump (on the side with a 4020), and reach in with an hex Allen wrench to turn the screw clockwise. If it will move 1/3 a turn - you can get an extra 5 or 10 horsepower and lots of smoke at full load. hope this helps

Does the pump have to be in a certain position to do this or does it work no matter where the pump is stopped.

no matter where it is

is it obvious when you take the cover off where this screw is at and do you know what size the allen wrench is?

it is obvious and it has been a while since i did one so you will have to figure out what size it is

do you know anything about a new holland p pump?

it DOES matter where the pump is when you take the cover off.....