Four-Cycle Rammer Low-Oil Shutoff The BS 50-4s and BS 60-4s are the first rammers in the industry with technology that shuts the engine off when oil is low. The rammers have an electronic capacitive sensor switch mounted into the bottom of the crankcase. When oil is low, a red flashing light signals the operator and the rammer shuts off within about 10 seconds. The units have 2.8 hp engines. The 137-lb BS 50-4s hits with 2,645 lb per blow, and the BS 60-4s weighs 154 lb and hits with 2,975 lb per blow. Wacker Group; 262/257-4131; www.wackergroup.com