So in regards to the new SA10 post hole auger by landpride that requires 4-10 gpm flow would the couplers still work or would the higher PSI cause an issue?
Also I would like to replace my quick connect block with individual flat face connectors. I know the loaders 4 hoses are not full flow all the time but would the max lift be affected?
These stated flow numbers can be horribly misleading!
Lets clarify a couple points.
Your entire system is 6.2 GPM, but you don't have use of that entire flow.
You only have use of 3.7GPM of it.
From the pump it's split via a priority valve to run 2 sets of systems.
Set 1 is not usable : Is the Steering and the PTO clutch and controls.
Set 2: Is the FEL, Three Point and BH.
The first set is unusable and is 2.7GPM.
The second set is usable at 3.7GMP.
So any 1/4 Hydraulic fitting are going to work on the usable portion of the system.
Pretty much anything you can use on the system, added valves, couplers, fitting and hoses are going to flow more than your system can ever put out!
You are way overthinking it all, it's not got the flow of a large system or a high flow system that you need to worry about anything you do.
Now as far as hydraulic run systems go:
The SA10 might or might not work, if it does work it will be terribly anemic as it will not get the flow which it want to run at.