Gunner Asch fired this volley in
:

Many of those presses had a high speed/low pressure mode..and when you
got down to the work, switched over to low speed/HIGH pressure.
Sometimes automatically..sometimes manually.

Gunner, if that pump is the only pump on it, then the only way to achieve
high travel rate would be with a secondary (perhaps coaxial) small
diameter cylinder. Even with the throttling rack thrown over all the
way, an injector pump just wouldn't provide enough volume to move that
big ram very fast.

Most of the presses I've worked on with dual-rate controls had a dual-
rotor pump -- sort of like a log splitter pump, although not all of them
were of the 'automatic change-over' variety.

For a 150-ton press, that has a very small motor. That generally implies
that it's a low-volume hydraulic system, et. al. At least, it's got a
pretty short stroke for the frame size.

LLoyd