We’ve had a couple of those Kershaw units in lately.
Terry, it’s all about torque with Diesel engines and those machines are all hydrostatic (meaning hydraulic pumps and motors do the propulsion, no physical transmission. The 6.6 and 7.1s are pretty commmon engine sizes on medium size equipment.
The larger excavator based units have the counterweight replaced with a power pack consisting of an engine, hyd pump, hydraulic tank, and big ass cooler all dedicated to the mulcher head so the excavator is not splitting its flow to run its functions and the very high flow mulcher head. Shinn Systems is a maker of those.