Three new models of the E Series Hammer line are available for use on medium and large excavators. They are ruggedly designed for extended durability and solid reliability, and features such as automatic shut-off, silencing, and vibration buffering make them easy on the operator. The hammers are designed to be field serviceable with common hand tools to keep them operating at peak performance. They feature a new symmetrical housing design, which allows rotating the housing 180 degrees to compensate for wear, effectively extending the life of the housing. Caterpillar.