Manufacturing and maintenance are very closely related to one another. Maintenance is one of the cornerstones of any manufacturing facility. Every manufacturing facility must have a good maintenance department to remain competitive. Preventative maintenance is one of the most important aspects when talking about a manufacturing facilities machinery.
When thinking about just in time manufacturing you must have reliable equipment. When a machine goes down everyone in the facility is waiting to know how long it is going to take to get the machinery back up and running. If a facility has older equipment you must have spare parts around in order to prevent longer down times. The older the equipment is the more likely the parts are obsolete, which is another reason why you should have spares on hand.
Another good practice to have when working on equipment is keeping a log book at each machine. By doing this everyone can see what the last problem was and keep everyone on the same page. Also it helps people see trends and solutions to previous problems. One could also keep a log on a computer if they chose to do so.