It sounds like the regulator you use to adjust the hose pressure is not working properly. Sometimes they can be affected if dirt or rust particles get into the regulator. You might be able to disassemble and clean it although some regulators are quite complex and require knowledge and insight in regulator repair to perform. It may also be the regulator is defective or worn out and needs to be replaced. Given the cost of the relatively low cost of the compressor it was likely not a very high quality regulator to start with and needs to be replaced.
SOURCE: My compressor only will put out 50 psi. It is not
you need a higher pressure discharge valve to reach more than 50 psi.
SOURCE: what type of oil for central pneumatic air
It should use 30 weight mineral oil, or 30 weight motor oil.
SOURCE: My PRO-SOURCE air compressor will not go over 50 psi
Your compressor has got a 'ring' problem. The rings on the pistons that compress air are leaking air by them and need to be replaced. Unless it's the 'pressure release' leaking. When it gets to 40 PSI or so, unplug it and listen for a leak. If no leak then it's the rings. inside on the piston. If you adjust the pressure switch all the way low, it might shut off near where it builds pressure to and you could at least use it some.
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SOURCE: the pressure gauge doesnt go
Try a separate gauge on the outlet line, like a tyre pressure gauge, and see what that reads. If it differs from you compressor gauge, the gauge is faulty or the needle is stuck, in either case the gauge will need to be looked at or replaced. You can probably pick up another gauge of the same size and scale quite reasonably and engineer it to fit if you cannot get the same gauge.
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