Garage Door Roller Replacement: reading the quote

A lubricant made for garage doors, applied lightly to hinge knuckles, roller stems and the springs, following the door maker's own recommendation, since the right product and whether bearings are included varies by manufacturer. General-purpose penetrating oils are thin and wash away, and heavy grease attracts grit. Nothing goes on the track raceway or on a nylon or plastic wheel. The opener's chain or screw rail may take a lithium grease according to its manual, and the manual for your door names what its maker prefers.

Track alignment and repair

Realigning jamb brackets, straightening a dented lip or replacing a damaged length of track is separate from the roller work and quoted as such when the inspection finds it.

Salt and rust in the lower track

A track full of brine, scale and grit needs cleaning before new wheels go in, and heavy corrosion can extend to the brackets and cables, adding to the scope of the visit.

Access around the tracks

Shelving, stored items or a vehicle that must stay in place slow the work along both tracks; clear access from floor to ceiling means less time on site.