| Description | Air Compressor 1-Cyl 440Cc Mx-13 |
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| Condition | New |
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| Brand | For Paccar By Yumak |
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| Part Number | 9122180027, 912 218 002 7 |
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Fitment Guide
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Kenworth, Peterbilt with MX-13 engines, some DAF trucks using PACCAR MX-series engines
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Specifications:
| Cylinder Diameter | Ø100,00 |
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| Volume | 440 cm³ |
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| Piston Operating Distance | 56 mm |
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| Port 0 | Ø30 mmPort 2 Ø20 mm |
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| Port 4 | M14X1,5 |
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| Port 8.1 | M22X1,5 |
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| Port 9.1 | M16X1,5 |
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| Port 9.2 | M16X1,5 |
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| Crankshaft Thread | M20 x 1.5 RH |
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| Number of Cylinders | 1 |
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| Cooling | Water |
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| ESS Feature | Yes |
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| Water Cooled Valve Plate | Yes |
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| Direct Working | Yes |
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| Maximum Operating Pressure | 14.5 bar |
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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.
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Signs of Faulty
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.
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Headquartered in Bellevue, WA, PACCAR® is a Fortune 500 company specializing in heavy duty commercial vehicles. Founded in 1915 as the Pacific Car and Railway Company, PACCAR Inc grew from a small railway equipment supplier to one of the world's largest manufacturers of light, medium, and heavy duty trucks. It is a major designer and manufacturer of diesel engines and powertrain components through dealer networks in over 2,200 locations around the world. The company also operates parts distribution centers for aftermarket support that includes customer call centers operating 24 hours a day and state-of-the-art inventory management systems that speed up order processing.
