The Why is, this engine is on a ride around locomotive, we currently have a throttle cable for control, engine drives a hydraulic pump which runs the wheels on the Loco, the thought is if we fix the throttle to a controlled RPMs.we could then control the speed of the Loco by controlling the fluid flow as we do now, the fixed throttle would prevent operators from messing with it,
This a new engine that came with the fixed throttle parts but no real instructions.
Thanks