A4722020219 Mercedes-Benz Trucks UMLENKROLLE

Basically, it’s a simple wheel with a bearing in it. It guides the serpentine belt – that’s the long, winding belt that drives a lot of your engine accessories like your alternator, power steering pump, and AC compressor. It doesn’t really drive anything itself, it just keeps the belt moving smoothly along its path. It ensures proper belt wrap and tension, especially when the belt is changing direction. Think of it like this: your serpentine belt is the road, and the idler pulley is one of those little guide rails you sometimes see, helping the car stay on course. It’s part of the belt drive system, helping to distribute the load and prevent the belt from vibrating or wearing prematurely. There can be more than one in your engine bay, depending on the setup. They’re usually positioned where the belt makes a sharp turn or needs a bit of extra support. If an idler pulley goes bad, it can cause a whole cascade of problems. Usually, the bearing inside wears out. You’ll notice if it’s failing because it’ll start making a whining or chirping sound, especially when the engine is cold or under load. It can also cause the belt to vibrate, which wears out the belt itself and can even damage the components the belt drives. If it fails completely, the belt can slip or break, leaving you stranded. It’s a relatively inexpensive part to replace, and preventative maintenance can save you a lot of headache down the road. You can often find a good selection of them at places like Fixparts Online. It’s much cheaper to replace an idler pulley than, say, a broken alternator because of a snapped belt. Proven by drivers: Idler Pulley (MPN A4722020219) is backed by a 12-month warranty!

Why Choose Mercedes-Benz Trucks?

• Keep your truck running its best with parts made specifically for Mercedes-Benz. They fit right and work like they should. • Genuine Mercedes-Benz parts are built to last, saving you money on repairs down the road. • We have a wide selection of parts available, so you can get what you need quickly. • Trust the quality and reliability that Mercedes-Benz is known for – protect your investment with genuine parts. Mercedes-Benz Trucks delivers excellence, FixParts Online delivers to your door.