Tow pressure valve on Nissan N350 mini excavator

[AKKAMAAN]

Hi all
Came across an older Nissan N350 mini excavator. It has a "tow pressure valve".
There is no pilot joysticks on the machine. All controls are mechanical.
Is there someone here that knows anything about such a valve on mini excavators?
Here is to only schematic available.

 

[ptsg]

I would say it's just a typo/bad translation/poor English.

That must be the two speed valve, where the combine the flow of the auxiliary pump to the other pumps and therefore provide more flow to achieve the high speed travelling mode.

 

[AKKAMAAN]

I would say it's just a typo/bad translation/poor English.

That must be the two speed valve, where the combine the flow of the auxiliary pump to the other pumps and therefore provide more flow to achieve the high speed travelling mode.

Thanks for your answer
I have had those typo thoughts too
Now I have gotten a hint about an 800+ page Kobelco handbook pdf that mentions "tow pressure valve" but the pdf is not searchable so I am currently OCR converting it. Let you guys know I there is anything of value in that Kobelco book...