increasing gpm in a 790

[sean miller]

how would one increase their gpm flow in a 790 john deere i installed a pressure guage in the hydraulics and shimmed it on the relieve valve.i do have a considerable amount of counter weight and having the cylinders enlarged would allow for more volume but also slow down the system any thoughts would be appreciated

 

[kennyd]

You would have to replace the pump with a bigger one, and it's just not feasible to do that.

 

[RoyJackson]

Sean, why do you think you need more GPM?
I agree with Kenny...probably not feasible, but with enough $$$, I'm sure it could be done.
But the 790 is a pretty light tractor (about 2000 lb ± 200 lbs). Increasing GPM would result in better FEL performance, but you may overstress the rest of the tractor so you may want to consider a 3xxx series machine.
The 790 is a value tractor and very good at what it was designed to do...but that means working within it's capabilities.

 

[RobS]

Depending on what you are looking to do, you could add a PTO pump?