Cummins Onan Authorized Dealer
RV Generator
Repair
As a Cummins Onan Authorized Dealer, JS Mobile Repair delivers factory-certified generator diagnostics, repair, and maintenance — right to your campsite or driveway within 50 miles of Round Rock, TX.
Factory Certified
Cummins OnanAuthorized Warranty Dealer
JS Mobile Repair holds the Cummins Onan Authorized Warranty Dealer designation — one of the only mobile RV repair services in Central Texas with this certification. This means we can perform warranty repairs, source genuine OEM parts, and service your Cummins Onan generator to factory specifications.
Cummins Onan Authorized Dealer & Specialists
JS Mobile Repair is a Cummins Onan Authorized Dealer — meaning we use genuine OEM parts, follow factory service procedures, and have the brand-specific training to properly diagnose and repair Onan RV generators found in Class A, Class C, and fifth-wheel coaches.
Whether your generator won't start, runs rough, surges, or shuts down under load, we fix it on-site without the hassle of a tow. From routine oil changes and filter replacements to carburetor rebuilds, voltage regulator failures, and control board diagnostics — we carry common Onan parts on the truck so most repairs are completed in a single visit.
What We Fix
Cummins Onan Generator Services
Diagnostics & Troubleshooting
Full electronic and mechanical diagnosis of your Onan generator. We read fault codes, test output voltage, load capacity, and identify root causes — not just symptoms.
- Onan fault code retrieval and interpretation
- Output voltage and frequency testing
- Load bank testing under real-world conditions
- Fuel delivery and ignition system checks
Carburetor Service
Clogged or worn carburetors are the #1 cause of Onan generator problems. We clean, rebuild, or replace carburetors to restore reliable starting and smooth operation.
- Carburetor cleaning and ultrasonic flush
- Full rebuild with OEM-spec jets and gaskets
- Fuel bowl and needle valve replacement
- Choke and throttle linkage adjustment
Preventive Maintenance
Keep your Onan running season after season with scheduled maintenance. We follow Cummins Onan's recommended service intervals to prevent costly breakdowns on the road.
- Oil and oil filter change
- Spark plug inspection and replacement
- Air filter service
- Fuel filter replacement and fuel system inspection
Electrical & Control Systems
Generator electrical faults can leave you without power at the worst time. We diagnose and repair voltage regulators, control boards, circuit breakers, and wiring issues.
- Voltage regulator testing and replacement
- Control board diagnostics and repair
- Breaker and transfer switch inspection
- Wiring harness inspection and repair
Starting System Repair
Hard starts, no-cranks, and starter failures are common Onan issues. We service the full starting circuit — from battery connections to starter motors and solenoids.
- Starter motor testing and replacement
- Solenoid and relay diagnosis
- Battery cable and connection inspection
- Remote start panel troubleshooting
Exhaust & Cooling Service
Overheating and exhaust leaks shorten generator life and can be dangerous. We inspect and service the cooling and exhaust systems to keep your Onan running safely.
- Exhaust manifold and muffler inspection
- Cooling air intake and exhaust path clearing
- Thermostat and cooling fan service
- High-temperature shutdown diagnosis
Why Choose Us
Authorized Onan
Experts on Wheels
As a Cummins Onan Authorized Dealer, we use genuine OEM parts and follow factory service procedures. Generic mechanics often misdiagnose Onan issues and replace parts that don't need replacing. Our factory-certified expertise means faster diagnosis, accurate repairs, and lower costs for you.
Cummins Onan Authorized Dealer
Factory-certified with genuine OEM parts — not aftermarket substitutes.
No Tow Required
We come to your campsite, storage facility, or driveway. Your RV stays put.
Transparent Pricing
Diagnosis fee applied toward repair cost. No surprise charges.
15+ Years Experience
Hundreds of Onan generators serviced across Central Texas.
Generator Down?
Don't let a dead generator ruin your trip. Call your Cummins Onan Authorized Dealer — we come to you and most repairs are completed same day.