At Harold's Used Auto Parts Inc in Philadelphia, PA, we have the facilities, equipment, and technicians necessary to complete any job, no matter how big or small. When it comes to fleet and diesel trucks, the right people with the correct equipment makes all the difference - we’ll keep your truck reliably on the road, and we’re the fastest, most efficient repair facility in the business. When it comes to trucks this size, and this valuable, cut-rate maintenance and repair simply won’t do; you need professionals, with the tools and equipment necessary to get the job done right.

Do you need new brake pads? Most of the time, if you think you do, the answer is yes. While a lot of auto parts stores sell brake pads with lifetime warranties, don’t be misled...brake pads will still wear down.

At Harold's Used Auto Parts Inc in Philadelphia, PA, we understand that the care for your vehicle is in the details. Transmission work, more so than any other type of maintenance or repair, requires a keen eye and specific know-how.

Balanced wheels are essential for a multitude of reasons, particularly on commercial trucks. At Harold's Used Auto Parts Inc in Philadelphia, we have the precision equipment necessary to provide you with the best balance possible, keeping your truck smoothly and reliably on the road.

At Harold's Used Auto Parts Inc in Philadelphia, we know that in order to keep your car in good shape, it helps to know how it works. Here’s a quick rundown of a system that’s very important, but you take for granted until there’s a problem; your brakes.

At Harold's Used Auto Parts Inc in Philadelphia, PA, our objective is to keep your diesel truck on the road, where it belongs. Whether it’s maintenance, repair, or information that keeps you from needing a repair, we do our best to keep you informed on how to best take care of your diesel truck. Cavitation is a leading killer of diesel engines. It’s an interesting process, albeit an expensive one if your diesel engine is a victim of cavitation. From our team here at Harold's Used Auto Parts Inc, here's what you should look out for:

Obviously, your fuel delivery system is an extremely important aspect of the running condition of your truck. At Harold's Used Auto Parts Inc in Philadelphia, our expert team of mechanics can treat and clean your fuel delivery system, ensuring you get the most out of your fleet.

Your fuel system is comprised of a variety of parts, each tasked with keeping your engine running strong - Chevy, Ford, and Ram all have small differences, and diesel systems have changed over the years with innovation in the field; however, the fundamentals haven’t changed. At Harold's Used Auto Parts Inc, our technicians are familiar with the differences between models and generations, but for the intents and purposes here they aren’t necessary to know. Here’s an overview of the major components you’ll find in most diesel fuel systems.

Diesel engines are known for their reliability - that’s probably at least partially why you bought one. However, like all things, diesels and their components wear out eventually. Fortunately, the technicians at Harold's Used Auto Parts Inc in Philadelphia, PA have you covered. Here are some fuel system issues to watch out for.

Good diesel technicians and shops that service diesel engines are hard to come by. At Harold's Used Auto Parts Inc in Philadelphia, PA, diesels are our specialty. There are many reasons to have diesel truck maintenance performed by diesel specialists - here are just a few.

Obviously, your brakes are essential. However, it’s easy to neglect or ignore brake issues, and even miss them altogether; as long as the truck still stops, many people don’t see the need to have their brakes serviced. From Harold's Used Auto Parts Inc in Philadelphia, PA, here are some common brake issues, and why you should fix them.

At Harold's Used Auto Parts Inc in Philadelphia, we know that some of the most elusive issues with any car, truck, or SUV are often caused by the simplest of malfunctions. While you might consider a gas cap fairly innocuous, it can actually malfunction too, prompting a check engine light on your dashboard.

Your turbocharger will work in essentially the same way, whether you drive a Powerstroke, Cummins, or Duramax diesel pickup. While there are differences in designs and applications, turbos haven’t changed all that much over the past century. Now that you know what one is made of, we’ll look at how it works.

When driving around town, your vehicle's engine needs clean air to burn the fuel – and it needs a lot. In fact, a typical vehicle needs about 216,000 gallons of air for every tank of gas. All that air passes through a filter that catches the dust and dirt. Eventually, the filter gets completely full, and because the filter can only hold so much, dirt starts getting through. At Harold's Used Auto Parts Inc in Philadelphia, we want to help you get the best air quality in your vehicle, but first, we want to explain the process of where this dirty air is going. 

At Harold's Used Auto Parts Inc in Philadelphia, we know there’s a lot of conflict on when you should maintenance certain things on your truck. We also know there are consequences to neglecting maintenance; the difference between a truck that breaks down all the time and a truck that has covered over a million miles virtually trouble free all boils down to maintenance.

At Harold's Used Auto Parts Inc in Philadelphia, PA, we know there’s a lot of conflict on when you should maintain certain things on your truck. We also know there are consequences to neglecting maintenance; the difference between a truck that breaks down all the time and a truck that has covered over a million miles virtually trouble-free all boils down to maintenance.

At Harold's Used Auto Parts Inc in Philadelphia, we understand that big trucks mean bigger risk on the road. Here are some tips to remember, to reduce the likelihood of an accident resulting in large repair costs next time you're on the job.

At Harold's Used Auto Parts Inc in Philadelphia, PA, we know that hearing you need a new transmission is a dreaded affair. Here’s some advice from the transmission experts on how to prevent that day from coming.

As your vehicle ages, it not only gains sentimental value but a number of maintenance measures arise as well. Trucks from previous decades have the potential to keep their value and functionality for many years. Here are some tips from Harold's Used Auto Parts Inc to keep your older truck running for a prolonged time.

For obvious reasons, air brakes are an essential part of your rig. They also add a level of complication to the braking system that a conventional vehicle doesn’t have. At Harold's Used Auto Parts Inc in Philadelphia, our mechanics have the knowledge, equipment, and ability necessary to keep your air brakes in top shape.