Not supposed to run hydraulics full throttle?

[Trivia]

So i heard something new today.

A contractor was having trouble with slurry precipitating onto bottom of the wagon during transport and plugging the pump/pipes. I asked whether he could have the circulation on but he said you're not supposed to operate hydraulic valves going down the road flat out. Surely you could adjust a valve (all electric mind you) to minimal flow and keep in on during transport? I mean load sensing hydraulics will only produce a certain amount depending on ask? And the pump rotates along with the engine RPM regardless? Surely a tractor on a planter will go along a field at 2000 rpm all day long, what difference does the last 200-400 rpm make?

Am I way off here?

 

[Exfarmer]

possibly meaning that some hydraulic systems should not be operated when you are travelling down the road as in some circumstances brakes and steering could be affected

 

[dowcow]

It might be something to do with safety? If a pipe bursts and you leave a trail of oil down the road and then you have no brakes. The brake circuit I should hope take priority over any auxillary hydraulic functions, along with steering. Some tractors used to run separate circuits and sumps for these anyway, possibly some still do.