9111530190 | by Yumak® Air Brake Compressor 1 Cyl 318CC

• Freightliner: Cascadia, 122SD, 114SD, Argosy, Century Class, Classic, FLD120, M2 112, 108SD
• Kenworth: T680, T880, T800, W900, W990, C500, T600, T2000, T440, T470, K200 and others
• Peterbilt: 579, 567, 389, 367, 379, 378, 377, 357, 520, 548, 348
• International: LT, ProStar, LoneStar, HX520, HX620, 9900i, 9200i, 9400i, WorkStar, Durastar
• Volvo: VNL 300, VNL 400, VNL 740, VNL 760, VNL 860, VNX 300/400/740
• Mack: Anthem
• Western Star: 4900, 49X, 57X, 5700XE, 4800, 6900, 4700
• MCI: D4505, J4500
• Prevost: H3-45, X3-45

• Calculated Volume (dm³)
  13.98
• Cooling
  Water
• Crankshaft thread
  M20 x 1.5
• Lubrication
  Lubrication supplied from engine
• Max. operating pressure
  145.0 psi
• Mounting
  Mounting Flange
• Operating speed
  3000 (1/min)
• Piston diameter
  3.35 in
• Piston stroke
  2.20 in
• Port thread 0
  0.81 in
• Port thread 2
  M27 x 2
• Port thread 4
  M10 x 1.0
• Port thread 8.1
  Ø 0.32 in
• Port thread 9
  M18 x 1.5
• Port thread 9.1
  M18 x 1.5
• Port thread 9.2
  M18 x 1.5
• Swept volume (cm³)
  318 cm³
• Technical specification
  OE specification
• Temperature range
  -30°C to +90°C
• Type
  Single Cylinder

1. Generate Compressed Air

• The compressor pulls in atmospheric air and compresses it to high pressure.

• This air is stored in air tanks for immediate use by the brake system.

2. Maintain Air Pressure

• Keeps the brake system pressurized at all times.

• Ensures the brakes are ready whenever the driver presses the pedal.

3. Operate Air Brake Components

• Powers brake chambers that push the brake shoes/pads against the wheels.

• Operates auxiliary systems in some trucks, like suspension or air horns.

4. Ensure Safety in Heavy Vehicles

• Air brakes require a lot of force to stop large vehicles.

• The compressor makes it possible to apply sufficient braking force safely.

• Air tanks take much longer to reach normal operating pressure.

• Brakes may feel weak or delayed.

Indicates the compressor isn’t pumping enough air.

2. Loud or Unusual Noises

• Knocking, rattling, or screeching from the compressor.

• Could indicate worn internal components, loose mounting, or damaged valves.

3. Oil Leaks

• Air compressors on heavy-duty vehicles are often oil-lubricated.

• Oil leaks around the compressor or into the air tanks signal worn seals or damaged internal parts.

4. Excessive Heat

• Compressor gets unusually hot during operation.

• Could be caused by internal friction, lack of lubrication, or air restriction.

5. Air System Warning Lights

• Low air pressure warning or brake system warning lights illuminate on the dashboard.

6. Compressor Runs Continuously

• If the compressor never stops running, it may not be building or maintaining pressure.

• Could indicate leaks, worn components, or failure of the governor (which controls on/off cycles).

7. Air Leaks in the System

• Hissing sounds from tanks, lines, or fittings.

• Often caused by a weak compressor failing to maintain pressure.

8. Reduced Braking Performance

• Longer stopping distances.

• Brake pedal feels “soft” or “spongy.”

• In extreme cases, brakes may not engage at all.