Yong Heng Questions

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PelletJunkie

PelletJunkie

Member
Sep 25, 2022
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Dallas, TX, USA
I purchased what appears to be an authentic Yong Heng compressor based on the details I read in another thread. Here is the ID plate on the one that I received:

20221211_164105.jpg


My initial observation is that the YH is a bit different than the Vevor clone that I own (differences in routing of the fill hose, cover plates, gauges, cooling fan grates, etc)

The temp gauge is not installed so I took off the cover to install it and I noticed that the white starter capacitor was just laying on top and not connected or bolted to the housing. Is that the best thing for it sit there loosely with all of the vibration or should I zip tie it or find another way to affix it?:

20221211_163622.jpg


20221211_163614.jpg


Also what batteries go in the temp gauge, does it use LR44/AG13?

I'm checking and tightening everything so that I can fire it up. If anyone is interested here is the eBay listing that I purchased it at (from a seller named happy-shopping01) and I received it in a few days:

www.ebay.com

Yong Heng 110V 30MPa Air Compressor Pump 4500PSI High Pressure Airgun Scuba PCP | eBay

Find many great new & used options and get the best deals for Yong Heng 110V 30MPa Air Compressor Pump 4500PSI High Pressure Airgun Scuba PCP at the best online prices at eBay! Free shipping for many products!
www.ebay.com

They state that they warehouse product in the US and offer a lifetime warranty (whether they would honor it is left to be determined). Try "make an offer" as you might be surprised at what the seller is willing to accept.

-PJ
 
PJ,
Looks like an authentic, good tip on "happy-shopping01". Use 357 batteries over L44, they'll last longer. My digital gauge snapped into place, just fished the wiring under, later had to remove cover to "unsnap" for new remote location. Recall my capacitor mounting looked the same, been running over a year now, no problems, so additional securing might not be needed. If going to add securing be mindful of air-cooling circulation needs. WM
 
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ddeadheadd said:
Just curious if you've given it a try yet?
Click to expand...
Not yet, the hole in the side of cylinder head is too tight and the temperature probe doesn't fit. I will need to drill or ream it out first. I need to know what the right size is so that it can have a snug fit. If anyone has run into this before I would appreciate any guidance on how you resolved it.

-PJ
 
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WorriedMan said:
Never heard of a probe not fitting, mine fits snug enough to stay in place, yet removes easily. Probe hole on mine faces directly rearward and is centrally located in aluminum head just above black-finned cylinder section WM
Click to expand...
WorriedMan

Unfortunately, I am a series of corner cases for tolerance stacking and uncommon manufacturing defects/issues. I have to send stuff back weekly for crazy issues (not cosmetic, but functional deficiencies). One of the latest examples is that I ordered a carbon fiber bottle and the one I received had a perfectly centered hole machined through the bottom of the tank.... When I contacted the vendor they apologized for sending out one of their event bottles that require the bottoms of the tanks to be drilled out for industry shows.

I want to provide an update on the YH now that the probe hole in the cylinder head issue has been resolved. I found a drill bit that had a snug fit and I reamed out the hole slowly while stopping to test fit and make sure the probe end would fit tightly. Once I found a satisfactory fit I blew out any shavings and debris from the hole.

Prior to installing the probe end into the cylinder head I slipped a ~4 inch piece of shrink tubing over the temp gauge probe wire and then used a heat gun to shrink the tubing. This should provide additional abrasion protection from the blue case edge that the wire would be vibrating against. I then wrapped some gaffers tape around the shrink tubing so that if there is any rubbing I can see it and replace the tape. I'm sure none of this is necessary but I have strange luck that makes me take additional precautions:

20221230_103507.jpg


I filled up the YH with Mobil Rarus 827 and checked to make sure it is at the top of the red dot and replaced the oil vent/filter plug. I took everything outside onto my folding work bench and started connecting hoses from the YH to the coalescing water separator (orange tube with purge valve), then the recycled Rover Mini gold filter with the cigarette filter plugs, and then the silver JB Alpha Filter that is directly connected to my Wingman 74cu tank. I setup my 5 gallon bucket with cold water (water frozen in water bottles) and the upgraded water pump and then I connected the silicon tubing to cylinder head (this is my temporary setup while I work out my Home Depot utility cart solution):

20221229_111153.jpg


I verified the pump was running and the water was flowing freely with no air in the system. I opened up the valves on either side of the YH and turned the unit on and let it run for 2 minutes with no pressure to warm everything up. After 2 minutes I snugged down the 2 valves on either side of the YH and then confirmed that the valves for the Coalescing and Alpha filter were completely closed. I opened the valve on the Wingman Tank and the YH started to build enough pressure to overcome the one way check valve and started filling the Wingman Tank.

It took five × 15 minute intervals (with 10-15 minute cool down cycles in between fills) to fill the 74cu tank from empty to 4300PSI. The YH never went over 56° temperature during any of the fill cycles. During the 15 minute run time I would purge all of the filters every 5 minutes. The only two that would expel water/moisture were the valve on the gauge side of the YH and the valve on the coalescing separator. I assume the separators and filters are working correctly as I never had moisture come out when I purged the JB Alpha filter.

When shutting the YH down after the 15 minute intervals I would purge moisture one last time and then open the two valves on either side of the YH and let it run with zero strain for a minute before turning it off. I kept the water pump running until it cooled down completely.

So far I have 3 hours on the unit and I have filled an empty 74cu tank and topped off several other tanks. I used a lot of the recommendations I read about on the forum (tightened all of the connections on the YH, ice in the water, break-in procedure, Rarus or Seco, etc). Aside from the issue with the size of the temperature probe not fitting everything worked out well and without issue.

I can appreciate the YH for what it is - an affordable, capable (when used correctly), and repairable high pressure compressor that fills a niche for air gun hobbyists that need to fill their own tanks without needing to make a substantial investment in a pro series compressor (Alkin, Bauer, etc). Overall I am impressed in spite of some of the other requirements like dealing with the 5 gallon water buckets, frozen water bottles, shorter run times, and temperature management. Obviously 3 hours is not a long term test and it doesn't really prove anything. Personally I will still get a better compressor (leaning towards Alkin), but the YH buys me some time to research the best option for me. Buy once cry once....

-PJ
 
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I disconnected that white capacitor from inside, drilled a hole (holes) on the housing top, and mounted it from outside with zipteys. Also removed the OEM plastic fan blade from the shaft and mounted an external dougnut fan (high volume flow = AC Infinity).
Cooling a rotor is much better now, also if the YH is Off the externaly powered fan runs independent.
 
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bigHUN said:
I disconnected that white capacitor from inside, drilled a hole (holes) on the housing top, and mounted it from outside with zipteys. Also removed the OEM plastic fan blade from the shaft and mounted an external dougnut fan (high volume flow = AC Infinity).
Cooling a rotor is much better now, also if the YH is Off the externaly powered fan runs independent.
Click to expand...

bigHUN

Do you have any pictures of your fan setup and your capacitor mod? Do you have a link for the external fan?

-PJ
 
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Hm, sometimes life is just not that soo easy as it looks like, during day I mostly browsing internet and forums from my tablet, but for any pictures I need to grab them from my PC.

high flow fan.JPG

20220508_110549.jpg


From the pictures I am sure you can figure how I mounted the capacitor from outside.
I have many AC Infiniti products installed in my 3d printer tent (fully digital Air recycling/Temp/Humidity controlled printing process), this fan in the picture is one of these, cannot really remember exactly which model, mount it 2-3 years ago, it is digital fan and you can connect a "speed control" as well. You would need to measure the black plastic cover OD, and the fans online have a 4 mounting screws.

Equipment Cooling - PROJECT AXIAL FANS - Axial Fans - AC Infinity

acinfinity.com acinfinity.com

Don't misstake these fans, these are high volume high speed fans in contrast to PC cooling fans.

where to put a valve.JPG
 
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bigHUN said:
Hm, sometimes life is just not that soo easy as it looks like, during day I mostly browsing internet and forums from my tablet, but for any pictures I need to grab them from my PC.

View attachment 319131
View attachment 319132

From the pictures I am sure you can figure how I mounted the capacitor from outside.
I have many AC Infiniti products installed in my 3d printer tent (fully digital Air recycling/Temp/Humidity controlled printing process), this fan in the picture is one of these, cannot really remember exactly which model, mount it 2-3 years ago, it is digital fan and you can connect a "speed control" as well. You would need to measure the black plastic cover OD, and the fans online have a 4 mounting screws.

Equipment Cooling - PROJECT AXIAL FANS - Axial Fans - AC Infinity

acinfinity.com acinfinity.com

Don't misstake these fans, these are high volume high speed fans in contrast to PC cooling fans.

View attachment 319134
Click to expand...
bigHUN

Nice setup. I have the same Husky Utility Cart. It is convenient that the cut outs on the side of the cart allow you to easily see the full window for the oil level on the front of the YH. Thanks for the visuals.

-PJ
 
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