Cat 312 aux piping

Hi guys,

I am trying to get both pumps on a Cat 312 to load up when using a hydraulic hammer. The digger at the moment doesn't have any aux piping and the service manual has the plumbing layout for some fancy system with ball valves. What i would like to do is to make both pumps work during hammer use so that one pump doesn't prematurely wear out.

I can pipe for single pump one way delivery no problem, but just need some help on how to get both pumps flow to the aux piping for one way flow.

Any help would be appreciated. Pictures or a diagram of an actual machine would be nice although i have the diagrams on the service manual just can't figure out how to pipe the pilot hoses.

Thanks

Cat 312 aux piping