The SM 4490 is an industrial-grade Self Starter Rocker Assembly (Brush Holder) engineered specifically for the JCB 3DX Backhoe Loader operating on a 24V electrical system. Utilizing a heavy-duty Bosch-style (B.TYPE) architecture with a high-torque 4-brush configuration, this assembly is built to survive the extreme duty cycles and environmental rigors of heavy construction and earthmoving.