Bell housings are connection elements between drive motors and hydraulic pumps.
Both connecting flanges are supplied ready for installation. The bell housings are made from an aluminium cast alloy. On the PTK (bell housing with built-in oil/air cooler) the oil is cooled efficiently by an air stream produced by a fan mounted on the motor shaft.
This combination of noise-damping bell housing and oil/air cooler considerably simplifies the construction and reduces the cost of hydraulic systems.
The high cooling capacity of the built-in cooler enables the user to reduce his tank capacity. This reduction in oil quantity results in a reduction in operating costs and oil disposal costs.