In the heart of Bosch's Feuerbach factory, located near Stuttgart, Germany, a team of skilled associates in gray work coats carefully assemble the CP4 high-pressure diesel pump in a narrow work cell. Each associate in the cell performs his function and then moves the component over to the next worker.

While the Feuerbach facility is a model of advanced manufacturing with a wide array of sophisticated machining tools, robots, computer screens showing real-time production figures and the kanban systems and signage emblematic of lean manufacturing, Bosch executives have made people the heart of this operation. In fact, six years ago, executives decided to abandon a fully automated line and make skilled operators the heart of their production process for this product.

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"Our high quality comes from dedicated people," says Werner Müller, executive vice president, manufacturing and quality management, for the Diesel Systems division.

Müller stresses that manning the line with people, not robots, was a business decision. During the downturn, he notes, Bosch did not have huge amounts of capital tied up in automation that was running below capacity. As demand has increased for the pumps, Bosch has added production lines and now produces 1 million pumps every four months.

The work cell producing the CP4 pump reflects the Bosch Production System, which is based on the Toyota Production System and emphasizes one-piece flow. Bosch bases its system on eight principles: process orientation, pull system, standardization, perfect quality, flexibility, transparent process, waste elimination and CIP.

Parts for the pumps are stocked in an external supermarket so that material flow is kept outside the assembly line. The supermarket holds about two hours of stock.

As each pump begins the assembly process, a transponder is attached to the pump and information on its production is tracked electronically. Pumps undergo a variety of step tests during production and every pump goes through a functional test before it is shipped.

It is demanding work. Bosch's clients for the diesel systems include a vast number of global automakers such as Mercedes, VW, Honda, GM and Ford. Müller points out these clients have no tolerance for equipment failures. The piston clearance in the pumps is 2.5 microns; for comparison, a human hair is approximately 60 microns in diameter. Müller notes that the pumps have just a 2 ppm failure rate worldwide and there are virtually no field problems.

Such precision manufacturing demands knowledgeable employees operating smoothly as a team. Bosch associates go through initial training to familiarize them with the pumps and the assembly process. Each month, leaders hold a team meeting to discuss continuous improvement initiatives, customer needs and other issues. And at each shift change, there is a brief meeting to go over any immediate issues.

Feuerbach is global headquarters for Bosch's Diesel Systems division, which employs 50,000 worldwide and has 24 production locations. The division had sales of 8 billion euros in 2011, with more than 80% of its sales outside Germany. At the Feuerbach factory, some 3,100 associates manufacture diesel products.