Takeuchi TB135 Installation and checkout of thumb.

I have a Takeuchi TB135, 2007 year, Purchased a thumb and have a couple of questions, how do I check and adjust the auxiliary hydraulic pressure? The instructions say to adjust the pressure to 1700 psi, where would I find the adjustment? The machine has a valve on one of the auxiliary lines but only on one side of the boom, the other side is just capped off, should there be a valve on both sides? Any information, help or suggestions greatly appreciated, Patrick

Takeuchi TB135 Installation and checkout of thumb.