Class A Diesel Pusher Repair in Austin, TX

Mechanically, this is our normal work

Strip away the coach and a Class A diesel pusher is a heavy chassis with a Cummins in the back, an Allison behind it, air brakes, and air suspension. That is not exotic to us — it is a description of most of what we work on. The diagnostic tooling is the same, the air system is the same, the aftertreatment is the same, and the failure modes are ones we see weekly on commercial trucks.

What is genuinely different is size, weight, and duty cycle. A coach is longer and taller than almost anything else on the road, it runs close to its weight rating whenever it moves, and it spends most of the year parked.

Most shops can't take one, and it's usually the door

Class A coaches commonly stand 12 to 13½ feet tall once the rooftop air conditioning is counted — and manufacturer spec sheets often quote the height without it. Standard automotive service bays are typically built for 10 to 12 feet of clearance. Before anyone discusses the work, a lot of shops simply cannot get the vehicle inside, and the ones that can may not have lifting rated for the weight.

We can take it. Height, length, and lift capacity for a 40-foot coach — which is why it is worth the drive rather than calling around.

The chassis under the coach

Class A diesel chassis come from a small number of builders. Freightliner Custom Chassis XC-series and Spartan K2 are the two most common; Tiffin's coaches ride on the PowerGlide platform developed with Freightliner. Engines are generally Cummins, but which one depends on the builder, the model, and the year — so we confirm from the coach and year rather than assuming.

Worth knowing: the chassis and the coach are warranted and serviced separately. Freightliner runs a dedicated chassis service network for RV chassis, distinct from the dealer that sold you the motorhome, because the coachbuilder does not warrant the chassis and generally does not work on it. That structure is the reason chassis work so often gets bounced around — and it is the work we do.

What we service

• Cummins diagnostics and repair — fault codes, derates, fuel systems, injectors, turbos, and leaks
• Aftertreatment — DPF and DEF/SCR faults, which idling and short trips between long sits make worse
• Air brakes and the air system — valves, dryers, lines, and the leaks that show up after a coach has sat
• Air suspension and leveling — bags, height control, and ride quality on a heavy chassis
• Transmission and driveline — service and diagnosis at coach weight
• Cooling — radiator, charge air, and coolant, the system that decides how a grade in summer goes
• Tires and alignment — heavy tire service and alignment, with tire age checked, not just tread
• Chassis electrical and charging — the vehicle's systems, not the house

Before a trip, and after a season parked

A coach that has been sitting is the one that strands people. Air leaks down, brakes corrode, coolant and DEF degrade, batteries sulfate, and tires age past their useful life with tread still on them. An RV pre-trip inspection four to six weeks before departure is the cheapest insurance available on a vehicle this expensive to recover.

Chassis and drivetrain — not the house

We do not service house systems — water, propane, appliances, slides, awnings, solar, house batteries — and we do not service generators. That stays with an RV service center. We are also independent: not a Freightliner, Spartan, Cummins, or coachbuilder authorized service center, and not affiliated with any of them.

Smaller coach? See Sprinter RV repair. Otherwise call 512-717-2777 with the coach, year, and length.

Common questions

Can you actually fit a 40-foot diesel pusher?

Yes. That is the first question worth asking any shop, and for most of them the honest answer is no — a Class A coach commonly stands 12 to 13½ feet tall with the rooftop air conditioners, while standard automotive service bays are built for 10 to 12 feet. We have the door height, the length, and lifting rated for the weight.

What is actually under my coach?

Almost certainly a purpose-built motorhome chassis from one of a few families — Freightliner Custom Chassis XC-series and Spartan K2 are the two most common, and Tiffin coaches ride on the PowerGlide platform developed with Freightliner. The engine is generally a Cummins, though which one varies by builder and model year. Tell us the coach, year, and floorplan and we will confirm before you come in.

Do I have to take it to a chassis dealer?

You have the option, not the obligation. Freightliner runs a dedicated chassis service network for RV chassis that is separate from your RV dealer, and it exists precisely because the coach dealer generally does not do chassis and drivetrain work. We are an independent alternative for that same work — the engine, the drivetrain, the brakes, and the air systems.

Do you work on air brakes and air suspension?

Yes. Air brakes, air dryers, valves, bags, and leveling are everyday work here — they are on the commercial trucks in our bays all week. On a coach that sits for months at a time, air leaks and dryer faults are among the most common complaints we see.

Do you service the living area or the generator?

No. We do the chassis, engine, and drivetrain. The house side — water, propane, appliances, slides, awnings, solar, and house batteries — stays with an RV service center, and we do not service generators at all.