Looking for Pressure spring on 2004 BX23

[Charlesp511]

I have a 2004 BX23 and I need to up the pressure a little bit. I can not seam to find the cap and spring location. any help would be appreciated. Thank you

 

[DustyRusty]

Low on the rear of the tractor on the left side. If you think of the transmission as a square, it would be the lower left corner.