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James
February 19, 2026
The head pressure not bleeding off. Is the check valve?
For model number CPL6025
Hi James, thank you for reaching out. Yes, a faulty check valve might be causing this issue; as it allows tank air to leak back into the discharge line and head. This constant back pressure prevents the unloader valve from fully bleeding the head, often causing the motor to hum or struggle to restart against the trapped pressure. Replacing it might fix the issue. The part number is PS18990719. Good luck with this repair!
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Perseverance-after having a hard time removing drain cock , oil drain and oil fill I could not exactly see where air filter was located, Found Air filter Pulled it out with needle nose pliers and could not find one locally. Luckily I found this site ordered filter and they shipped right away. Got my filter and the old Air Compressor is alive again . Thank you so very much. You have a customer for life. Thanks, Mary
1. Removed air pump from compressor 2. Removed oil 3. Removed 8 bolts holding bottom of air pump 4. Replaced bottom with the new gasket 5. Replace the 8 bolts 6. Refill 16 oz oil 7. Reinstall air pump to compressor
