A heavy workload, long hours and little sleep during the busy season make machine maintenance a challenge. It’s easy to put on a few more miles between oil changes or delay repairs until the work slows down. But that’s when things often go wrong: A stop for fuel puts you behind schedule, a tire is low on air or the tank you thought was empty still holds waste from the day before.“It always happens when you have a whole bunch of stuff to do the next day,” says Wade Pennau, owner of Packerland Portables in Wautoma, Wisconsin. “It’s usually when
