model 921.153101 Craftsman compressor will not build pressure
(St. Gabriel, La.)
I have a model 921.153101, 1 hp, 3 gal, 125psi compressor. It will only pressure up to 35 psi. Everything in the compressor looks good. Even checked to be sure the cylinder walls were not scratched. I went ahead and changed the reed valves and replaced gaskets. Still doing the same thing.
Ron, you've nailed the first two of the issues that can cause an air compressor to run, and run, and not build air pressure.
Assuming that the valve and gasket replacement was successful, and there are no leaks to account for air loss, then I would guess that the cylinder seals may be going.
Craftsman 1 HP 5gal - reed valve problem
How do you replace the reeds for this type of compressor?
Hello Jaret. Thanks for writing in.
I haven't dismantled every single air compressor to know specifically how the reed valves in your compressor are removed and replaced.
Ask your local Craftsman store where they get their air compressors repaired under warranty. Go and see those folks, and get the straight goods from them.
Or, check out the Repairs page and see if there's a local to you compressor repair location.