When working towards a common objective, a multidisciplinary team can more easily scope improvement potential and detect bottlenecks sooner (without addressing blame to one department). Although departments have different perspectives and other responsibilities, it will promote transparency and, therefore, true collaboration. The departments (or silos) have to understand that they need each other and that everyone will want the best result for the whole site.
Everything the maintenance department does is to enable production to create as many products of high quality as the customers want. This is where you can find the common ground; good installation performance means good production whereas no production (i.e. bad installation performance) leads to dissatisfied customers. Embracing the common goal can be vital to organizational success.
A favorite KPI to use to this end is Overall Equipment Effectiveness (OEE). The percentage is measured by multiplying availability, performance and quality. All of those OEE parameters are influenced by both Maintenance and Operations with Maintenance focusing on realizing maximum asset availability and reliability and Operations aiming to achieve the best production quality and highest reliability. In other words, the overlapping focus of OEE makes it a good KPI for a joint improvement goal.