The 4300 Watson drilling rig can be mounted on a crawler or truck chassis. Its unique swing-out cab design provides better visibility of the hole and Kelly winch. The positional rotary allows for drilling over casing and the power retractable lower mast permits an easy transition to big auger drilling. Non-computerized controls deliver maximum reliability. The 4300 rig can travel in a single-load transport without disassembly, including the Kelly bar.