Your commercial vehicles and trailers are a big part of your logistic business and you wouldn't want to lose customers because of frequent breakdowns. And that's why at S.E. Smith & Sons, INC., we are committed to offering top-notch fleet management services.

Being a next-gen mobile truck repair Azusa, CA, company with decades of experience in heavy duty truck repair and maintenance, we are equipped with all the resources to help you get on the road as soon as possible.

If you ever get truck problems in Azusa, CA, or the surrounding areas, we are the company to call.

highway with cars on it
highway with cars on it


If your heavy duty truck is running rough or your equipment is broken down on a job site, on the road, or anywhere else, we’ll bring a custom mobile service truck to your location, equipped with an expert technician, scanners, parts, compressors, welders, and hose making equipment. We will get you up and running in the fastest possible time. We'll take care of you in off hours as well, we have 24/7 service, because we know, when it's an emergency, you just need it fixed.


  • Emergency Mobile Repairs – 24/7
  • Extremely qualified mechanics, most with decades of experience 15,000 lb Mobile Cranes
  • Hydraulic Hose Making Equipment
  • Vast Vendor Network – We can get the parts you need, fast
  • Fast, detailed reporting on your repair


  • PM Services
  • 24/7 Repair
  • Standard Maintenance
  • Mast Repairs
  • Hose repair
  • Tune Ups
  • Transmissions
  • Brakes
  • Engine Overhauls


  • Emergency Repair
  • Fleet Servicing
  • Tune ups
  • Rebuilds
  • Coolant Systems
  • Transmissions
  • Brakes
  • Differential Repair

Owning a fleet of medium-duty diesel trucks means that breakdowns can happen anywhere. And with our mobile repair services, you get to sleep better at night knowing the best of the best are on the lookout for such shortcomings. Our quick response team composes top mechanics with an experience of over ten years. And with the state-of-the-art equipment such as 15,000 lb. mobile cranes, you're assured of fast turnarounds. At S.E. Smith & Sons, we believe in customers' satisfaction.


Are you looking for mobile truck repair Azusa, CA, services or mobile heavy duty repair Azusa, CA, services? Look no more because at SE Smith and Sons Inc., we have been voted as the best mobile fleet service repair Azusa, CA, company.

Our quick response team is always ready to provide emergency mobile repair services. More importantly, we expedite our repair services to get you on the road in no time. In case of extensive damage, we provide towing services to provide more personalized repair in our Azusa, CA, garage.


Major engine problems in your heavy duty truck can cost you a fortune. Why don't you mitigate these unnecessary expenses by keeping your fleet's engines well maintained with quality synthetic oils from SE Smith and Sons Inc?

We understand that oil play crucial roles in the engine such as lubricating moving parts, cooling, preventing corrosion, and many more. That's why our oil change and lube service are conducted by top-of-the-shelf ASE-certified technicians.


Complete engine breakdowns, ignition failures, and non-functioning lights just to mention a few are some of the common pointers to a truck's electrical failure. The good news for residents of Azusa, CA, and surrounding regions is that our technicians have the expertise in using multimeter and the knowledge in troubleshooting truck's electrical problems.

Over our many years of discharging this service, we've handled every electrical repair job with the precision and accuracy it deserves.


Diesel engines and transmission are complicated and require specialized care from an expert. And with diverse equipment and manpower, at SE Smith and Sons Inc., we can comfortably say we are the top brand in Azusa, CA, in providing superior engine and transmission repair services.

When you bring your truck to our shop, we maintain these systems to ensure your heavy equipment leaves our premises at optimum torque conversion efficiency. More importantly, we work fast to avoid inconveniencing you.


For decades, we've been a proud leading trailer repair shop in Azusa, CA, and the surrounding regions. And being an authorized Azusa service, parts, and sales center, rest assured you've come to the right place.

Our state-of-the-art workshops are equipped to handle even the most complicated trailer repairs and our ASE-certified technicians are top-notch. More importantly, we provide trailer rentals at affordable prices.


Diesel vehicle tune-ups need to be conducted by a professional who knows how modern diesel engine works. And one of the key areas to pay attention to during the inspection is the transmission system. At SE Smith and Sons Inc., we are the real deal in conducting your heavy equipment preventive maintenance and tune-ups in Azusa, CA, and the surrounding regions.

We understand that oil becomes thicker in diesel engines faster and that's another key area we pay attention to. Our tune-ups are tailored to leave your heavy duty truck operating as per the manufacturer's specifications.

To learn more, please see our Services page.



Rudolf Diesel, the father of diesel engines, built the first well-known prototype of the high-compression engine in 1897. Since then, through modifications and customizations, the diesel engine has enhanced to being one of the most dependable types of power for all types of vehicles.


Now fast forward, years later in 1919, where Lyle Cummins improved the diesel engine to produce the world's finest engine. The very first engine Cummins created was for farm use, and it was mainly sold in the Sears Roebuck and Co. catalogue. After making diesel engines for trucks and buses, Cummins finally installed the first diesel-powered engine in a passenger car.


Later on June 17, 1935, he decided to make a test run of this prototype. Cummins travelled 3,774 miles from New York to Los Angeles, which cost him about $7.63 back then. Right now that would be around $138.05. Not too bad compared to other engines. 


In 1989, Dodge Ram adopted a 5.9 liter 6-cylinder 12v turbodiesel engine with an output of 160 horsepower and 400lb.-ft. of torque. And although other trucks like Chevy and Ford already had installed diesel engines at the time, nothing came close to Cummins diesel engine. With a direct-injected and turbocharged engine, Cummins was on a completely different lane.


However, as times changes, so did Cummins' diesel engine. Over the years, specific changes were made for better performance. These included:

  • 1991- An intercooler was integrated into the engine
  • 1994- The old injection pump was replaced with the Bosch P7100 which meant better manual transmission numbers
  • 1998- The P7100 was replaced with an electronically controlled rotary injection pump-- the VP44
  • 2001- The injection pump was replaced with the common-rail Bosch CP3 which allowed for multiple injection events that reduced engine noise
  • 2007- the 5.9L Cummins engine was redesigned where displacement was increased to 6.7 litres. This engine also came with a whole 350 horsepower at 650 lb.-ft of torque


In 2019, Ram HD trucks redesigned the Cummins Diesel Engine pushing the limits of the turbocharged engine. Now the engine boasts of an impressive 1,000 lb-ft. And although the turbocharger's size grew, it is now capable of a 33 psi of boost. The engine is now 62 lbs lighter compared to previous models of the engine owing to the use of a compacted graphite iron engine block.


  • Inline 6 cylinder
  • B20 biodiesel compatible
  • Bosch high-pressure common rail fuel system
  • Cast iron cylinder heads and engine block
  • Holset HE351VE variable geometry turbocharger

These days, Cummins Diesel Engines are available in most heavy-duty trucks from top manufacturers around the world. If you are looking for innovation, reliability and power, choose Cummins.

Our mobile repair services allow you to take to the road, or get back on the job, with confidence, without the fear of production loss due to a mechanical breakdown. Give S.E. Smith & Sons a call today—or any day—you need mobile repair for your truck. We serve the entire San Gabriel Valley area, including Azusa, Duarte, Irwindale, Baldwin Park, Covina, Glendora, Pomona, San Dimas, La Verne, and Monrovia.


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