Prevost and Marathon Bus Conversion Coach Repair

A converted coach has two parents. The shell, the chassis, the air system, the bay structure and the glass came from a bus manufacturer building a commercial vehicle to a production standard, with parts availability and documentation to match. Everything above the floor line and much of what is visible came from a converter building one of perhaps thirty coaches that year, largely by hand.

The practical consequence on an estimate is that half the vehicle can be looked up and half cannot. A bay door hinge is a bus part. The polished stainless trim ring around it may be a converter part that was made in a batch of forty and never again. Getting this wrong is how a repair estimate doubles halfway through, so the estimator establishes the boundary before quoting anything.

It also changes who a question goes to. Air suspension, brake systems at the wheel end and shell structure follow the bus builder's methods. Interior joinery, electrical distribution above the floor and the entertainment and climate systems follow the converter's. Both are in scope here, and both are quoted from the posted price bands.

A commercial coach shell is not a body on a frame. It is a welded steel or stainless cage where the roof, the sides, the floor structure and the bay walls all act together, and the outer skin panels are hung on that cage. There is no ladder frame underneath doing the work.

That means a hit anywhere in the lower body is a structural question, not a panel question. A side impact into a bay area loads the cage member behind the bay, and a repair that replaces the skin without measuring and correcting the cage leaves the coach permanently out of square. You will see it later as bay doors that will not shut and glass that will not seal.

Measuring is therefore the first operation. Structural damage assessment and frame work are posted at $750 to $20,000 across 5 to 80 hours, and the relevant page is structural damage assessment. On a shell this size the measurement takes real time, and it is not an optional line.

These coaches almost universally wear a multi layer painted scheme rather than gelcoat and decals, often with metallic or pearl layers and a hand laid graphic. That is the most demanding refinish work there is, and it is the single largest cost driver on any conversion body repair.

The problem is length. A 45 foot side panel reflects a straight line, and any variation in the surface or the film build shows up as a bend in that reflection from thirty feet away. Stopping a repair at a panel edge is not an option, so refinishing runs to a break line that may be most of the coach. Full paint refinish is posted at $5,000 to $35,000 across 40 to 250 hours, and colour matched blending at $500 to $5,000 across 4 to 25 hours.

Paint supplies are calculated at $55 per paint hour, so on a large refinish that line is substantial and entirely predictable. The booth at the Yorba Linda facility takes the full length, which is why coaches come here from well outside Orange County. See full vehicle paint.

The house side, comprehensively. Hydraulic leveling from HWH or Power Gear runs $350 to $6,500 across 2 to 25 hours. Generator service on Onan and Cummins units is $400 to $8,500 across 2 to 35 hours. Inverter and charger replacement sits at $750 to $4,500 across 3 to 14 hours, and house battery work including lithium conversion is $500 to $5,500 across 2 to 10 hours.

Air bag suspension repair is posted at $500 to $4,500 across 2 to 18 hours, which matters on a coach that spends months parked and settles onto its bump stops. Slide mechanisms, where a converter fitted them, run $500 to $8,500 across 3 to 35 hours.

Engine and drive system repair is not performed here. A conversion with a driveline fault goes to a coach chassis specialist, and the estimator will say so on the first walk. Everything the house does and everything the body does stays here.