Description
PURGE ASSY KIT – “NEW” STYLE
Part Number: FK022105C
Direct replacement (cross ref) for K022105.
Product Overview
The FK022105C purge assembly kit is a replacement component used in the truck’s air dryer system. The air dryer plays an important role in keeping moisture and contaminants out of the compressed air system, and the purge assembly is one of the parts responsible for removing collected moisture during operation.
This kit replaces OEM part K022105 and is compatible with Peterbilt truck applications. When the purge assembly starts wearing out, the air dryer may not work correctly, which can allow moisture to stay in the air system.
What the Part Does
The purge assembly releases moisture and contaminants collected by the air dryer during the drying process. When the compressor builds air pressure, the air dryer removes moisture from the system, and the purge valve helps discharge that moisture when the cycle is complete.
The purge assembly needs to open and close correctly to maintain proper air dryer operation. If it sticks, leaks, or does not seal properly, the air system may not be able to remove moisture as designed.
Common Problems This Part Solves
A worn purge assembly can create several air system problems. Common signs include:
- Air dryer leaking air
- Excessive moisture in air tanks
- Frequent air system issues
- Compressor running more than normal
- Poor air dryer performance
- Pressure problems caused by air leaks
Drivers may notice air escaping near the dryer or moisture collecting where it should not. In some cases, the problem may not be obvious until other air system components begin showing signs of contamination.
Why Replacement Matters
The air system is one of the most important systems on a heavy-duty truck. Moisture and contaminants inside the air lines can create problems with valves, brake components, and other pneumatic equipment.
A failing purge assembly can reduce the effectiveness of the air dryer and allow water to remain in the system. In colder conditions, moisture can become an even bigger concern because freezing can affect air system operation.
Compatibility and Fitment
This purge assembly kit replaces OEM part K022105. Always verify the original part number and air dryer model before ordering. Air dryer components can vary depending on truck configuration and system setup.
Installation and Service Notes
Installation requires removing the old purge assembly and installing the replacement according to the air dryer manufacturer’s procedures. It is also a good time to check the condition of other air system maintenance items.
Related Part: Air Dryer Cartridge – FAC1001C:The cartridge and purge assembly work together inside the air dryer system, so replacing or inspecting both parts can help maintain reliable moisture removal.
Use Case
This purge assembly kit is commonly used in air dryer repairs, fleet maintenance, and preventative service on Peterbilt trucks. It is a practical replacement for trucks experiencing air leaks, moisture problems, or reduced air dryer performance.
About Us
We’re a family-owned group of Peterbilt dealerships dedicated to getting you the parts you need quickly and affordably. Whether you’re looking for Paccar OEM parts, reliable aftermarket replacements, or popular upgrades like seats and filters, we make it easy to keep your truck running and on the road. If you don’t see what you need online, just give us a call or send an email — chances are we can get it. We pride ourselves on fast service, fair prices, and being a partner you can depend on when downtime isn’t an option.
FAQs
Q1: What are the signs of a bad purge assembly?
A: Common signs include air leaks near the dryer, moisture buildup in air tanks, and air dryer performance issues.
Q2: How often should a purge assembly be replaced?
A: There is no exact replacement interval because service life depends on mileage, operating conditions and air system maintenance.
Q3: Can a bad purge assembly damage the air system?
A: A failing purge assembly can allow moisture and contaminants to remain in the system longer than they should. Over time, this can contribute to wear in other pneumatic components.
Q4: Should the air dryer cartridge be replaced at the same time?
A: It is often a good idea to inspect the cartridge during purge assembly replacement. Since both parts work together, replacing worn components together can restore proper air dryer operation.
Q5: Can I install this kit myself?
A: Experienced technicians can handle the replacement, but proper air system procedures should be followed.
