Truck Repair

When you bring your semitruck to Ruiz Diesel Service LLC, you can rest easy knowing your vehicle is in professional hands. We take every possible step to ensure your experience is smooth, efficient, and stress-free. Our mission is to provide fast, reliable semitruck repairs while prioritizing safety and customer satisfaction.

Whether it’s a minor air leak, an oil issue, or a more complex radiator or valve problem, our team ensures your truck is running at peak performance. We handle both minor and major repairs, including:

Services Included

Truck Repairs & Overhauls

From minor fixes to complete engine and transmission overhauls, our expert mechanics ensure your truck performs at its best. We handle brakes, clutches, radiators, and more with precision and care.

Mobile Diesel Mechanics

Can’t bring your truck to us? No problem. Our certified mobile diesel mechanics come directly to your location in or near Tracy, CA, delivering quick, reliable, and fully equipped on-site repairs.

Tire Repairs & Replacements

Whether it’s a flat, a blowout, or worn treads, we provide professional tire patching, balancing, and full replacements using durable, high-quality brands — keeping you safe and road-ready.

Trailer Repairs

We handle everything your trailer needs — from suspension adjustments and air valve replacements to lighting and tire repairs — ensuring your trailer is fully compliant, safe, and dependable.

Truck Diagnostics

Using advanced computer diagnostic tools, we quickly pinpoint mechanical, electrical, or software issues across all major semitruck brands like Volvo, Detroit, PACCAR, Cummins, and Caterpillar.