The simple answer to "how
concrete pumps work" is, a concrete truck discharges its concrete into a hopper on the back of the pump truck. The hopper has a mesh grate the concrete falls through which prevents any large rocks or chunks from plugging the pump truck hoses. The hopper also has an auger that churns the concrete keeping it liquid and flowable.
Once the concrete is in the hopper, it gets sucked into a valve system in small int