Power unit replacement system for a work machine

A machine may include a frame and a lift system. The lift system may include a lift arm attached to the frame. The lift arm may be configured to actuate between a raised position and a lowered position. The lift system may include a roller attached to the frame. The machine may include a power unit including an energy storage unit and a power unit housing containing the energy storage unit. The power unit housing may include an engagement element configured to engage the power unit housing with the lift arm. The power unit housing may include a cam element, projecting from the power unit housing, configured to slidably engage with the roller during actuation of the lift arm.