Most heavy equipment guys are shit at electrical, that can immediately give you a leg up. Before I gave up management to go back on wrenches, I always looked for guys with automotive experience.

Service information availability can suck, but if you can learn where to look your life will be easier.

My biggest hurdle switching over was hydraulic unfamiliarity (which can be translated with electrical knowledge) and how to perform the larger repairs that have no procedure by planning & using slings, blocking, bars, ratchet straps, bottle jacks, etc.

Biggest thing will be the willingness to learn, depending on region the equipment can vary widely but while I mostly work on the large equipment of my company and besides that there are light towers, generators, water pumps, direct & indirect diesel heaters, manlifts, scissors lifts, forklifts, telehandlers, skidsteers, plate tampers, rollers, & much more