Yong Heng compressor ... I just bought 1 ...

[Fate]

I use mine several times a day. It never gets over 40c filling my gun to 3k.

To protect against deposits, I put distilled water into my 4 gal container. A large quiet fountain pump with a 3' lift replaced the stock one. I have the water return line above the surface so I can hear the water burbling when it's running. Shortly I'll put some water wetter in it when I go to the auto store next time as extra insurance. To minimize water loss and contamination I ran the tubing and power cord through holes above water line that fit the tubing and cord just tight enough no water can spill, and snapped the lid on. My repurposed cat litter container sits a few inches below the pump. I had the water on top for a few days but with the short fill probe line it was such a pita I exchanged positions. No change in water flow or temps have been noted.

The synthetic ATF hasn't budged in level or changed color... although it's only been in use a short time. I'm happy with the whole thing now. What a great pump. I can't imagine doing what I do now with a hand pump.

[Nerka]

Well I hate to say this but my compressor is dead, it ran fine for 2 test runs of about 4 seconds each, connected to my gun and DEAD, I tried different outlets and removed cover to spin crank, still it just buzzes and shuts off. ARGGGG, I contacted seller for the 30 day refund or exchange.

[OleTomCat]

Well I hate to say this but my compressor is dead, it ran fine for 2 test runs of about 4 seconds each, connected to my gun and DEAD, I tried different outlets and removed cover to spin crank, still it just buzzes and shuts off. ARGGGG, I contacted seller for the 30 day refund or exchange.

Check to make sure you have a 110v vs 220v compressor.

[Nerka]

Thanks for the thought, but it is a 110v, with 110 plug, like I say it worked great for first few tests, then hook up gun and nada. Will drain oil in AM pack it up ans ship it back.

[tracker1955]

Just as a side note, some of the 220v units came with a 110v U.S. style cord attached.

[OleTomCat]

Just as a side note, some of the 220v units came with a 110v U.S. style cord attached.

Exactly why I asked, I have one....

[tracker1955]

One other thing that may help before you ship it back, the compressors are tested and the oil drained before they are packed, if the carton spent any time upside down the small amount of oil that's left in the crankcase will drain into the second stage piston and seals and cause a vapor lock. This same thing happened to me two years ago when my unit was new, I had to remove the jug from the first stage and the jug from the second stage and wipe out the excess oil or the motor would stall and hum. Those second-stage seals are brand new too and it doesn't take much to make the compressor stall on startup.

[Nerka]

One other thing that may help before you ship it back, the compressors are tested and the oil drained before they are packed, if the carton spent any time upside down the small amount of oil that's left in the crankcase will drain into the second stage piston and seals and cause a vapor lock. This same thing happened to me two years ago when my unit was new, I had to remove the jug from the first stage and the jug from the second stage and wipe out the excess oil or the motor would stall and hum. Those second-stage seals are brand new too and it doesn't take much to make the compressor stall on startup.

I did check the product label stamped on side of case and it is a 110v, and like you say if oil seepage was to get in from transport, it would have stalled from the get go, but as said it ran fine for a total of 2 times, 3-5 seconds each, if it were a an over compressed issue it seemed it would have occurred at first, so I have contacted the seller and have a shipping label printed, I have reordered another one from a cheaper seller that will pay shipping on returns, this seller is dinging me shipping on this return, so his loss of the entire sell.

[Nerka]

I just watched a series of an overhaul of this compressor, after watching this I have no fear of running this thing hard, it is so simple inside, as long as you keep the temps in check no reason not to run the beans out if it, need new parts............parts are easily available.......there os a 4 vid seires.

[Thane]

That is the right attitude, run it, fix it , run it....

Those expecting to run Chinese compressor  without turning some wrenches have a bad experience.

Order a piston kit now and you'll only be down for minutes.

[Nerka]

That is the right attitude, run it, fix it , run it....

Those expecting to run Chinese compressor  without turning some wrenches have a bad experience.

Order a piston kit now and you'll only be down for minutes.

the time to overhaul is drinking a cup of coffee or a beer, well maybe 2

[Nerka]

Well I returned my !st compressor, and got my money back, than reordered one from another vendor, without the auto shut off, but this little thing gets with the program, filled up my FX Crown to 250 bar, it didn't get over 127 deg F, and the went to fill my CF tank of 97 CF, was about 3K lbs and went up to 4K lbs and the house breaker kicked off, and shut down, I find the phone, refer, computer are all on the same circuit, arggggg, so will ned to get a dedicted line to avoid interruptions, can this run on a standard 20 amp line? or go to 30?

[tracker1955]

Best to be on a dedicated 30 amp.

[Nerka]

Best to be on a dedicated 30 amp.

Thanks, I think that is the way to go.

[tracker1955]

I know some just borrow the one for the washing machine, plug it back in for the mrs when done.

[OleTomCat]

Well I returned my !st compressor, and got my money back, than reordered one from another vendor, without the auto shut off, but this little thing gets with the program, filled up my FX Crown to 250 bar, it didn't get over 127 deg F, and the went to fill my CF tank of 97 CF, was about 3K lbs and went up to 4K lbs and the house breaker kicked off, and shut down, I find the phone, refer, computer are all on the same circuit, arggggg, so will ned to get a dedicted line to avoid interruptions, can this run on a standard 20 amp line? or go to 30?

I run my 120 volt Yong Heng on a 20 amp circuit with the upgraded water pump without any issues at all.  No need for 30 amps.

[UnderPressure]

The High Pressure end doesn't get lubricated by the oil, the oil only lubricates the shaft at the bottom of the piston.  The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow.

I wonder how good this is:


It's Royal Purple compressor lube, so it's not like running motor oil.

NO royal purple is not designed to run in HIGH PRESSURE COMPRESSORS ! period ! its made for low pressure compressors HUGE difference !  ...we have members on here that are seeing burning oil/carbon residue in the high pressure side of the compressor running royal purple !  …. go back ,and read this thread  , why on earth would you buy royal purple that cost the same price over chemlube 751 that is designed for this high pressure compressor ? …. 

Sounds like using oil made for high pressure compressors (like Nuvair 751) is really important then. (reason: the high viscosity keeps the oil out of the air stream).

[OleTomCat]

The High Pressure end doesn't get lubricated by the oil, the oil only lubricates the shaft at the bottom of the piston.  The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow.

I wonder how good this is:


It's Royal Purple compressor lube, so it's not like running motor oil.

NO royal purple is not designed to run in HIGH PRESSURE COMPRESSORS ! period ! its made for low pressure compressors HUGE difference !  ...we have members on here that are seeing burning oil/carbon residue in the high pressure side of the compressor running royal purple !  …. go back ,and read this thread  , why on earth would you buy royal purple that cost the same price over chemlube 751 that is designed for this high pressure compressor ? …. 

Sounds like using oil made for high pressure compressors (like Nuvair 751) is really important then.

If you want to spend more on oil than you did on the compressor then go right ahead, I've been using the Royal Purple and filling 30 & 60 min SCBA tanks from empty to 4500 psi without issue on one of the compressors, parts finally came in for the second one now I have to put in the dedicated 220 outlet for the compressor to run on and I can fill more than one tank at a time.  When you put the LP piston in correctly there should be very little oil getting past the three rings what usually happens is that when they are put together the assembler or rebuilder doesn't pay attention to the orientation of the ring gaps, they need to be spaced ~ 120 degrees apart, this creates a labyrinth that keeps most of the oil in the sump.  The oil gets dirty fast since the pump shaft is hardened steel and the piston rod is aluminum...

[UnderPressure]

Spec sheet comparison of Nuvair 751 (a high pressure compressor oil) vs. Royal Purple compressor oil:

https://www.nuvair.com/brochures/Nuvair_751_2019.pdf

https://www.royalpurple.com/wp-content/uploads/2019/01/RP-PDS-Synfilm-Recip.-100-2019.pdf

[UnderPressure]

I've been using the Royal Purple and filling 30 & 60 min SCBA tanks from empty to 4500 psi without issue on one of the compressors, parts finally came in for the second one now I have to put in the dedicated 220 outlet for the compressor to run on and I can fill more than one tank at a time. 

How long have you been doing this for?