The SM 4529 is a premium, Original Equipment (O.E.) Grade Self Starter Rocker Assembly (Brush Holder) specifically designed for the JCB 3DX Backhoe Loader (12V System). Identified by the 036 series designation, this assembly utilizes a heavy-duty Bosch-style (B.TYPE) architecture with a high-torque 4-brush configuration. It is engineered to withstand the brutal vibrations and dusty environments of construction sites, ensuring the "Earthmover-class" torque required for JCB Dieselmax engines.