Is it time to rebuild my Yong Heng?

[igolfat8]

I have been using my Yong Heng compressor for nearly two years and it’s always worked great to fill my rifles and small peanut air tank I carry while hunting. Recently it seems like it is taking a LOT longer to top off my peanut tank from 3000 to 4500 psi, which is well over 15 minutes now. Just wondering if you think it’s time to rebuild the compressor top end? Anyone have a USA source for parts and a parts manual? I’ve always changed the oil at 20 minute run time intervals and have a little over 2 hours of total run time on the compressor now. I’ve always kept the run temps below 65C too.

 

[airgunfans]

2 hours is a very short run time so I dont think you need to rebuild it. Check for leaks. This has always been the cause of slow filling / pressure build up failure for my Yong Heng which has got 7 hours of total run time so far. There has not been any significant wearing of internal parts.

 

[biohazardman]

I agree with airgunfans it's most likely a leak. While I don't normally turn the compressor off under pressure that is a best way to find leaks. Run it up to 3K+ psi shut it down and check for leaks. I have over 16 hours on mine in near two years of use. I had the high pressure sealing washer on the top of the head leak, probly cuz I overheated it several times, and a couple of o-rings died as well. I changed the oil at 40 minutes the first time as it was really looking dark. After that initial change I have only changed the oil a couple times in the 16hours I have run it and I doubt it needs changed that often.

 

[igolfat8]

Should I need parts does anyone know of a resource here in the US?

 

[biohazardman]

No, you buy a Chinese compressor you go to China for the parts. 

Aliexpress usually has the parts you need although you have to word the searches just right to find them. Shipping can take a few days to a couple of weeks.

https://www.aliexpress.com/store/2940062?spm=a2g0o.detail.1000002.2.4a2d398fnRbpja

 

[igolfat8]

I found a leak in the hi pressure blow off valve. It was leaking. I tightened it really tight and leak disappeared. Thanks for the tips.