Tuxing compressor

Anyone have experience with this/ these compressors?

I have an M042 and it is pushing 2 years old. I don't run any of these *special* oils, just what is recommended by Tuxing, synthetic of some type.

Fills 6.8L in ~45 minutes
Fills 9.0L in ~75 minutes

Runs fairly cool, gets up to 130F or a bit higher when filling a 9L. But I usually dump some ice in the cooling water before I start.

Only issue I've had is the cheap water pump died. I replaced it with a higher flow pump. Needed a reducer from the pump 1/2 outlet to the compressor 1/4 inlet.
 
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I bought one about 3 years ago, it worked well for 6 months then I stopped using it until now. Unfortunately is not pumping air anymore so I ventured into changing all the O Rings, seals, check valves, etc. I followed the YouTube Tuxing videos in great detail but it only pumps very little air and will not go above 50bar…. I guess I am doing something wrong, but I cannot figure it out…. :-(
 
So i picked one of these up. I believe it was the m42 whatever. Packaging looked great, opened her up, hooked up water pump and lines from a bucket. Tried to fill a 2.5lt tank and before it even hit 3000psi it tripped the breaker on the machine. Checked the temps and it was around 80ish 90. Wierd. So reset the breaker and tried again. Only ran for a short time before it tripped the breaker again. It takes a long time to fill a tank. I forgot what the timer said but less than 30 mins of run time. And really struggles after 2700-3000. Not sure whats going on with it. Dead heading the unit just to see if it will reach the 4500psi mark and ut gets there no issues. A bottle on the riffle it does ok. Still slower than my yongheng. Anyone know of what it could be?