0421224 | Yumak® Air Brake Compressor 1 Cyl 352 CC

Description: Single Cylinder Air Brake Compressor 1 Cyl 352 CC Condition: New Brand: Yumak Part Number: 0421224 Fitment Guide 0421224: Daimler, Evobusa, Freightliner, Kenworth, Mack, Mercedes-Benz, Paccar, Peterbilt, Volvo Specifications: Cylinder Diameter Ø85 mm Volume 352 cm³ Piston Operating Distance 62 mm Port 0 Ø30 mm Port 2 M26x1.5 Port 4 M12x1.5 Port 8.1 Ø6 mm Port 9.1 M14x1.5 Port 9.2 M14x1.5 Crankshaft Thread M20x1.5 LH Number of Cylinders 1 Cooling Water ESS Feature Yes Water Cooled Valve Plate Yes Direct Working Yes Maximum Operating Pressure 12.5 bar A single cylinder air brake compressor 0421224 is a mechanical pump used on vehicles with air brake systems - commonly heavy trucks, buses, trains, and some industrial equipment. Its job is to compress air and supply pressurized air to the brake system. 1. Supply air pressure for safe braking The compressor keeps the air tanks filled so the brakes can work reliably. 2. Simpler construction With only one cylinder and piston: fewer moving parts, easier servicing, lower manufacturing cost. 3. Good for moderate-duty applications Works well for: smaller trucks, buses, farm equipment, older heavy vehicles, industrial machines. 4. Lower maintenance costs Single-cylinder units are generally easier to troubleshoot and rebuild than larger multi-cylinder compressors. Signs of Faulty 0421224 1. Slow air pressure build-up One of the most common signs. The compressor takes too long to raise tank pressure to operating range (often around 100–125 PSI). You may notice: Warning buzzer/light staying on Long wait before driving Pressure gauges rising very slowly 2. Low air pressure The system cannot maintain normal pressure. Possible effects: Weak braking response Air brakes not releasing properly Repeated low-air alarms 3. Compressor runs constantly The compressor never seems to “cut out.” Normally, the governor unloads the compressor at maximum pressure. A failing compressor may struggle to reach cut-out pressure. 4. Excessive oil in air tanks Worn piston rings or seals can allow engine oil into the air system. Signs include: Oily residue when draining tanks Oil-contaminated air lines Damaged air brake components 5. Excessive moisture buildup A weak compressor can overheat or fail to properly manage airflow, leading to excess condensation. You might see: Water in tanks Frozen airlines in cold weather Corrosion in the system 6. Unusual noises Bad internal components can create: Knocking Grinding Squealing Clicking These may indicate worn bearings, valves, or piston damage. 7. Air leaks around compressor Leaks may occur at: Head gasket Fittings Discharge line Unloader/governor connections 8. Overheating The compressor may become excessively hot due to: Poor lubrication Restricted discharge line Carbon buildup Internal wear 9. Smoke from compressor area Blue or gray smoke can indicate oil burning or severe internal wear. 10. Frequent governor cycling If pressure rapidly drops and rebuilds repeatedly, the compressor may be weak or unable to keep up with demand. Manufacturer information A subsidiary of Daimler Trucks North America, Detroit Diesel® is a worldwide leader in manufacturing state-of-the-art engines, transmissions, and axles for various applications, including Western Star Trucks and Freighliner. Established more than 80 years ago, the company has expanded its product lineup to include telematics and advanced safety systems for a complete trucking solution. It takes pride not just on its product coverage but also its undying commitment to excellent customer service. It is composed of passionate, highly skilled, and knowledgeable people who ensure Detroit Diesel remains at the forefront of the heavy-duty engine and chassis components manufacturing industry. Headquartered in Detroit, MI, the company focuses on providing only the highest quality and innovative trucking solutions in the industry. Warranty First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.