Cost effective maybe, on "hobby" applications or applications with low utilization...
Interesting article. Our simple hyd systems make sense on compact
tractors, but you start to explore their limits with backhoe attachments.
To quote from the CCEFP article:
æ’¤ump-controlled technology is
best for machines that have multiple
actuators that work simultaneously,
like excavators, telehandlers, timber
harvesters, wheel loaders and so on,
Williamson explained. é„*ny cylinder
could be pump controlled, but there is
little advantage over traditional systems
for actuators that work infrequently
or a single actuator by itself "
I had a long discussion with a Kubota engineer about their move to dual
HST drives for their latest mini-excavators. Electrically-controlled mult-
pump systems make a lot of sense here.
Since our simple one-pump systems are a feature of our compact
tractors (rather than a bug), we make use of several work-arounds.
One is to put restrictors in the swing circuit. Some hoes have this, mainly
to slow down the swing. But it also helps the operator use another
valve simultaneously.
Parallel switchable work circuits, like I did for my thumb, also make sense.
Operating 2 valves at once also gives you a type of "load sensing". e.g.
if you set a hoe bkt on the ground and simultaneously operate BoomUP and
DipperIn, you can rake the ground with the bkt teeth, following the ground
contour. With the thumb, you can grapple objects better than with
independent operation.
