February '21

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36 • RV PRO • February 2021 rv-pro.com "It's firsthand experience of how things need to be maintained and warning signs that say things are about to fail," he says, giving as an example the stress that RV furnaces are made to handle. "RV furnaces are only manufactured to cycle four to seven times an hour. When you're living full-time in your RV – especially here in the Grack points out some of the tools he uses in his service shop. While Grack's job in mobile RV repair often involves traveling, Grack says that sometimes he can help RVers troubleshoot problems with their unit just by speaking with them on the phone. Colorado winter – it's cycling nine, 10, 12 times an hour. It's fatigue on the furnace," he says. "I have two furnaces, one sitting in the back ready to be swapped out." Far from learning everything he knows from personal experience, though, Ken Grack is a strong believer in the value of his RVDA/RVIA certification, which requires testing on more than a dozen modules. He flips through a binder holding his certificates from a variety of completed continuing education courses, on such topics as tankless water heaters, hydraulic lift systems, air conditioning, and generators. A certified RV technician must renew that certification every five years, he says, and he's in the process of being certified for the fourth time. Because an RV is "an assembly of after- market parts," training in all those disci- plines is critical, according to Ken Grack. A technician needs to be able to fix a light switch, troubleshoot a water leak, rebuild a refrigerator, and so much more. The only parts of an RV that he doesn't work on are the engine and drive train. "To work on an RV, you have to be patient," he adds. "It takes several years to learn what questions to be asking." The Gracks take repair many manuals with them when they go out on repair jobs.

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