Many people throughout the developing world rely on a hand pump for their water supply. But, like any other mechanical device, hand pumps wear out and break. The causes and the frequency of malfunction are affected by many variables. Keeping the pumps working Ð Òhand pump sustainabilityÓ - is a critical problem with many facets. This manual has been written to address one of those facets, the shortage of trained pump repair technicians. It introduces repair technicians to the technical skills, knowledge, and attitudes that are considered necessary for a successful pump repair program.