I think the picture displays both pumps are belt driven. I'm sure for hundreds more than a clutch would be worth and fail you could have one installed. Why have another part that could fail you, also with a trans your creating more expense then I would see running one pump would be worth.
Even if you had use of energy and wear on the other pump your not operating the cost of being able to turn it off to me wouldnt justify having a clutch.
Just my opionion not Johns I'm sure.
When you go this big, cost is a factor but not the only factor.
Now we all know that you and I do not actually go out and work with the wand all night. I don't know about you so much, but I only supervise and give breaks at times. 20 minutes or so of wand use per man. ( 45 minutes at the most per two man break ). The days of me working the wand for 5 or more hours a night are over.
But there are times when shutting down the one pump is required, unless you are going to use your unloaded all the time which would wear the unloader, possible the belts, pumps, etc. out quicker then just shutting down the pump.
As the thread says..." Big Boys ". And if you want a "Big Boy" you have to pay for it.
As far as the pumps, I think he would offer the 30 mil shaft INDUSTRIAL pumps as an up graded option on there. Sure the difference is about 3 to 600 dollars more per pump, but the pumps would last allot longer.
Ours pumps are 30 mil shafts as well. Our pumps that we bought and installed on our Delco D 6300 are still running. The pump was rebuilt in 1998/9 ish. We installed it right after our General 24 mil shaft pump went out in 1990/2000 ish. The general pump was around 1 to 2 years old. The 30 mil shaft pump in the Delco is still working everyday and is still strong 18 ( +/- ) years later.
You get what you pay for. No one gives you a BMW 650i series for a Ford pinto price. If you do know of someone, let me know.... I'll pay cash!
When we designed our equipment, we had to make some tuff choices. Always at the top of the list was the costs and the 2nd was, how high end do we really want to go or do we need that feature in our line of work?
Where do you draw the line and say enough is enough ?