The truck comes from Euless, 17 miles out, so every Saginaw install gets scheduled rather than promised same-day. Once we're on site, the first step is checking the opening against the new door's spec - plumb, square, and headroom, since a lot of these 1999-build garages have settled slightly over two and a half decades.
We pull the old door and track, set new jamb brackets if the old ones are pitted or bent, and run fresh track matched to the door's curve radius. Springs get sized to the actual installed weight of the new door, not a generic chart number, then wound to the turn count that door needs. Opener wiring and safety sensors get checked against current clearance even if the opener itself isn't being replaced. Last step is a full cycle test under load, both by hand and by opener, before we call it done.