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Easy way to test the dryer is to bypass it temporarily. Just connect the in and out air lines together. There are check valves behind the air tanks if one tank does not seem to fill up you can take them apart and check them. The unloader has lubricant in it which dries out and turns into hard pieces when sitting for a year unused in hot weather. Sometimes driving it will help loosen the stuff up. When the air dryer cycles you know you have reached governed pressure though. Turning it up a tad cant hurt. Governor is on the compressor.