My compressor will not build pressure above 3000 psi, is it the piston rings that possibly need replaced? TIA Steve
Yong Heng?
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might be the top piston rings/seals? if you type in yong heng parts they come up on ali express
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Could be seals. I'd eliminate leaks first as that will be easy. If none are found then a rebuild will probably be needed. Doesn't seem to be too hard from what I've seen but it seems like there have been quite a few structural failures of the low side piston top center where the high side piston sits. I'd check that area well for any signs of cracking.
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I got a spare piston with rings on aliexpress. It took about 3 weeks to get here. $15. I think the complete jug with piston assembly is about $60.
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Replacement parts cost is certainly not high with these compressors. If they work for people and they can do a little service at times, why not.
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Leaks will make a compressor not pump up as you have indicated. Being it will pump up to the pressure you have indicated I would dead head the foster on the hose with the plug that is made for this. My first check point would be the bleeders. I have had the same problem on another brand compressor. It would do the same thing and AFTER a leak test it was the bleeder. As you know the higher the pressure leaks can appear. If it pumps up to 3000 I would do the bubble test on all connections but it could be internal.jmo
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