The thesis is a part of bachelor in mechanical engineering, Karlstad University, 180hp.
Keolis i Sverige (Keolis) conducts public service transport and it’s responsible for the bus service in
the inner city of Stockholm. The workshops that is responsible for the maintenance of the buses, is
considered to have a too big technical vehicle reserve, 15% and that they are inefficient. The
inefficiency depends on old traditions and heritage.
The purpose of this thesis is to quantify what a lean implementation would result in the workshops.
The implementation has been done using the visits and interviews, analysis of maintenance, traffic
and accounting systems and other internal reports, such as employee surveys.
The analysis shows the non-determined follow-up, mechanic whose initiative and dedication is not
being utilized and an uneven workload as the main reasons for the inefficiency and the long lead
times, which in turn is the cause of the need for existing carriage reserved.
The lack of monitoring means that there is no basis for an improvement in a lean perspective.
The company has the potential to make great savings by equalizing the workload, optimize lead
times and invest in a quality work. With quality work is meant to reduce the number of errors that
the buses get in traffic. One way might be to start turning a periodic maintenance to a more
condition-based maintenance as a way to be in the forefront of the industry.
One estimate is that halving the lead time would mean that wagon reserve requirements would
reduce by 85%.
A reduction of the remedial requirement by 2% / day equivalent time wage cost of the mechanic,
with current lead times.
A lean implementation where responsibility moves down the organization, combined with clear goals
would very likely increase motivation and morale and thus job satisfaction of the workshop workers.