*Thanks dude!!! The reed valve fell out and I was lost. I put it in backwards and it did NOTHING. No harm done thank God! I watched your video and I was up and running in 5 minutes,,,,, Make that 20 minutes as I had to replace 6 other O-rings that worked fine before. I would HIGHLY SUGGEST that you and EVERY YONG HENG owner buy 2 or 3 of these "O-RING" rebuild kits on ebay or amazon before you need one again and YOU WILL. MY error was my cooling water was scolding hot since it was 114 F. out today. While I was knee deep in dead varmints and the hunting was GOOD. Here's the funny part. After rebuilding my compressor it now works 35% faster and is way more powerful!!! Gets to 4000 PSI twice as fast. Makes me think I inadvertently fixed a factory defect of some kind. IT REALLY KICKS ASS NOW!!! This goes down in my memoirs as the first ever case of "IF IT WORKS GREAT, FIX IT AGAIN JUST FOR THE HECK OF IT". Note: I am glad I was using an expensive high quality crank case lub like my Mobil 827 Rarus synthetic lubricant. The 827 rarus saved the whole compressor from guaranteed Armageddon. The main reason I say this is I have at least 100 hours on this compressor and the top of the tiny piston looked very clean. My older Yong Heng which was beyond repair used number 46 hydraulic fluid and it's great if you want to start a carbon manufacturing plant! Please please please, if you can read this post use only Mobile 827 Rarus crank case fluid!!!! Keep the fill level about 1 or 2 mm over the red dot since during use it goes below the red dot. THE RARUS 827 LUB REALLY ROCKS!!! I always thought a lub was a lub if you changed it often enough. I learned the hard way, not a cheap way to learn!*

I know this has been two years ago but I just found your channel and watched this vid great vid sir . I’ve got one I’ve had two years and it’s a great little pump but you have to take care of it keep it cool is the main thing don’t Run it over 30 minutes. And I take mine apart every 3or four hours and clean it up like your doing know . Believe it or not they are making them a little better now than then . Great video sir thank you I thought I was the only one that does this . Most people just bitch about it and throw it in the trash when it don’t work

I had the same o ring fail on my check valve. Your video and the extra parts that came with the unit should save the day. I found out we should be using a Diester oil for these compressors.

Appreciate you doing this video! Quite simplistic in design actually but to the unknown adventurist a mind frazzling nightmare 😂

Great video. Mine still works great but this will prompt me to tear it down and do a cleaning/check. Thanks

Great job on showing how to break this down..thank you for making this..may i suggest using synthetic grease on the seals/o-rings next time..

ABSOLUTELY GREAT VIDEO "MATE" ! Thanks for the detailed description of every move you make (sounds like a song doesn't it?). It has been very helpful in repairing , maintaining my HY compressor. I would like to add that I have had mine running for over 3 years now without any problems on the same oil in tropical conditions. I have added extra air cooling of the air pipes cooling, always use cool water, have added a little bit of oil to the water to keep the alu parts from corroding. I had a major incident which could have been catastrophic when I accidentally forgot about the compressor running and when I remembered it was the pressure was at around 12.000Psi !! Compressor was still running, no damage at all but I had to change the regulator as the pin tended to get stuck as it must have been stressed by the over-pressure. It was the only time I left the compressor alone and I learned the hard way. On the other side of this experience it was amazing that nothing bad happened and that the compressor held out. Only now, months later an air leak appeared at the cylinder but it was still pumping the tank up to 4000Psi ! I decided to give it major maintenance and that's when I discovered a 2d leak the longer output air pipe. This may have happened when I took it apart as it may have become brittle over time although I was very careful not to stress it. I have ordered a set of replacement pipes. I might also add a little oil cooler with a 12 v pump as I noticed the oil tends to get quite warm. I normally compensate for this by putting a cold wet cloth over the casing and changing it whenever it gets hot or dry. Your video gives me the little detailed maintenance tips I need to do the job right. many thanks and keep up the great work.

Thanks for the video, great stuff, being able to see the inside workings...

Very good break down of the unit and all of the internals. Now I'm not so afraid to work on mine if it ever needs it.

Thanks, I needed that . Appreciate it.

Mine was burned out straight out of the box. Mine's not yong heng, its morphon. But it's the same compressor. They drained the oil before sending it to me but not well. The residual oil that was left was black and smelled like it was scorched. I filled it with fresh oil, hooked it up to a bucket of water and fired it up. It heated up and the temp steadily rose up to the upper limits so I shut it off and just that little bit of running turned the fresh oil tar black. I replaced the oil with fresh oil, filled the bucket with ice water and replaced the water pump with a more powerful one and tried again. The same thing happened. They gave me my money back and wanted me to pay to ship them the compressor. I refused and wrote a bad review on amizon. They contacted me and said I could keep it if I remove my bad review. I removed it thinking I would rebuild the compressor. I just went back to the scuba shop instead. All 7 of my scuba tanks and my 2 scba tanks are empty now and covid has shut down the scuba shop, so it's looking like I'll be rebuilding that pos compressor now.. thanks for posting your videos this the most info I have been able to find on them. Were you able to get it back running? Did you hone the cylinder and replace the piston rings after separating them? Does it matter?

Outstanding video mate. Thank you, Patrick B from socal.

I have. The seller asked me to send a video of it running while I soap fittings. I have done that. No Leaking. I feel air in the front, I assume it’s the cooling fan. Hoping for an easy fix.

Hi, I use car coolant/antifreeze in the cooling system rather than just plain water and it seems to works well.Great informative video by the way !

Quick question, I filled my tank to 4500psi and I mistakenly closed the valve on the tank before turning off the compressor or releasing the air from the drain screws and now my Yong Heng compressor blows air out of the black oil fill cap instead of the fill hose, do you have any idea of what the issue could be I would really appreciate it ,TIA

Wow, thanks for this video. I searched for help with my yh compressor. Got 2 scba 45's, and today the pressure didn't seem to build beyond 3k. I have the molecular cive, as you do, but opted to remove it for the small filter straight line try. No luck! I noticed some oil seeping down from the black fin at high pressure section of the yh unit. Do you think my issue is the rings???

Hi Sambo, excellent strip down guides. I have a Yong Heng copy that’s worked perfectly for along time, but has now started to leak out of the oil breather (the black filter that sits on the oil sump) the pressure starts to drop on the compressor once it’s stopped and then starts to blast air out of the oil breather. do you have any ideas? Take care. Andy

Have problem whit mine, gon bad fast, dont build pressure over 200bar now. Any idé?

Thinking about buying one of these. Has anyone used some antifreeze to help control the corrosion on the aluminum ports. It would not take much to prevent that corrosion.

hi, i just got one of them, and m making the water of that chaimber a high stainless steel block, to stop building corrosion,and any part it does in future, i'll do the same, and it will ever lasting, cheers brother i seen your vedio thanks for that u just make me thinking about these cheers lad

Hi, great video, where would I get a replacement check valve ( start of video) if needed, have checked aliexpress without any luck, thanks.

From where u get the clock for the working hours?

Better than the non existent manual. Mine is pumping hot air out the intake filter and wont build pressure. I replaced the blown out gasket, but that didn't solve the issue. The big reed had no obvious issues. Mine has. About 3hrs on it. Odd part is everything worked fine the last time i used it. Dumped the pressure off the two dump valves before turning it off.....

I was scrolling through your videos to see where you might have done a tutorial on the installation of the hour gauge on the yong heng compressor but did not see it. Can you advise me of which video and part and location acquired the hr meter. Thank you for this video I just so happen to see it pop up and immediately checked it out.

Good on ya' Mate...can you provide a link to where you got the dual cylinder filters over by the fireplace? It seems quite important to add them in line before the air gets to your tank!!!

Thank you very much for the information.

Anyone know of a good food grade synthetic oil to run for the best possible output of breathing air? Picked everything needed up and two of the big tri filters to run in series to clean any moisture/oil or smell the best possible. But theirs got to be a good quality oil more geared to breathing air compressors some of you use huh?

Sir your videos are the best Ive seen on this compressor may I ask you a question if I purchased the kit to install auto shutoff into my compressor how difficult would it be ?

After I removed the screws I could not seperate the high pressure top from the cylinder head . I wanted to check the bottom of the high pressure top and pump rod attached to the piston. It sure was stuck and would not budge. Any suggestions.

Hello. I love your videos about the Young heng compressor. I did a maintenance session on mine which happens to be identical but since I did the maintenance by the book I get no compression or high pressure air ouput. I dismanteled it 3 times and redid the maintenance checking during every phase doing so. but stil no high pressure air output. I noticed no damage, did the reassembly following your video but to no avail, Any ideas what could be wrong? I have a hint that it might be one of the check valves that is not stopping the air from returing into the cylinder. Any other ideas? Could you maybe produce a video about what to look out for to avoid this kind of problem? Keep up the great work!

Hello, how do you get the contact info from the manufacture to by parts, and who makes the copy of the Yong Heng PCP

Hey sambo!! Hope all is well. It seems I can’t find much help troubleshooting my Yong heng. It had served me well for 2 years , but unfortunately it had failed me today. I have no idea where to start or what to replace. Both air chambers are holding pressure, but it just won’t go past 1500psi ( I usually fill my 100cu 4500 guppy tank , all the way to 4500. Never had a problem until today ) I do notice of a crank close the release valve (with a bit of force from a wrench) on the second chamber it will climb to 2000psi but if I hang tighten it will fall back to 1500psi and just float there running. I don’t know what to do. I can’t fill my tank anymore. Any help would be appreciated. I’m prepared to take apart, but I have no idea what to replace or look for , like I said.

I see you use the coalescing type water separator, do you find it effective ?

Got a leak on the fill hose then the bottom of the cyl no pressure. Used 2 days

No paper gasket under the lower reed???

About the fins not blowing any air directly at the motor, just bend the fins to do so.

good job thanks dear 💐

Is your pump a 220v model or the 110v ? I see you have three rings on second stage piston and my 110v only has two rings and a empty groove on the bottom. Customer service told me that they didn’t put three rings on the 110v and only on the 220v and I was wondering if that was true. Thanks

what if the compressor cannot build up pressure

The video is great! Thanks. I just received my YH today. It runs, but builds 0 pressure. I get a good hiss out of the hose untill I connect it to my tank. I’ve checked all fittings for leaks and the bleeder valve is closed. Any suggestions?

Hey do you know where I can order parts for my compressor I strip out the nut the holds the air tube to the block. I had a small leak and was changing the o ring

It surprised me that I am able to hear a hissing sound at the hose end after reading how loud they are. It is a small amount of air that can almost be stopped with a finger. The YH is no louder than my small 120 psi compressor.

Royal purple makes a coolant additive that very well in a auto radiator. Im going to try it. If it works good i will let it be known :)

i need help got eater in my rifle give me a clue where to look for faults

It appears these units require distilled water for the coolant.

You have electrogalvanic corrosion in the water jacket due to the use of dissimilar metals (brass nipple, aluminum jacket). I'd suggest swapping the brass plumbing out for nylon. By the way, the issue is severe if you have that much corrosion after only 3 hours of run time.

Hi.. I have a generic one .. but mine does not build pressure.. well barely.. I tightened all the hex nuts.. burst disc is still good.. but just can't get the burst sound when I about to turn off the compressor.. there's air coming out..though... I always here it all the time but not anymore.. any idea?

Sambo, use distilled water instead of tap water for cooling your compressor. pour 2 gallons into your bucket. To cool the water, freeze some water bottles filled with whatever water you like. But since the frozen water is contained inside the water bottle, it can't contaminate the distilled water. Just toss the frozen water bottles into the bucket with your distilled water. When finished, you can reuse the distilled water. Since the process for distilling involves turning the water into vapor, then re-condensing it back into a liquid form, it's free of minerals. You will have zero corrosion or mineralization inside of the water chamber. Just a suggestion, but a cheap and easy fix.

Any news on the replacement fan?

22:11 No that just have a very small hole to dampen any fast moving air into it, it should be screwed in tight.

Hello sir. very nice video. My English is not very good. the safety valve with a red cap and a ring? left side. Could you explain to me how to use it? Thank you and good day. Django from Belgium.

Is there any oil or lubricant which would not diesel at all

gracias 👍

My disk blew on the top nut now I get no pressure at of it

I saw a guy who would place a block of ice in his coolant water

My water ouyput has slowed to a trickle. The pump is still strong. Any suggestions?

I bought that compressor (at 220volts) and use it only once 35 minutes approx. After I turn it on and it loses strength does not last even 2 minutes and stops alone... I could be hoping you'll help me 🤷‍♂️🤷‍♂️

Nice

Where do you get the parts?

Your not alone with problems with yong heng, mine is basically brand new have filled 2 90ci bottles to 4000psi that’s is high as it would go, filled them 3 times so that’s 6 bottles And it shit out on me last night. Can only get 2000psi now if I’m lucky. I thought I was being smart and saving money I should have gone with the likes of the one Crosman released or even the air Venturi

9.32. well then. then it must have done 2 houres because i thought i saw the counter on 1 when you installed it :)

I recently bought this compressor for diving but it has oil tastes and its imposible to breathe

Aluminum safe coolant would be your best bet. Hard Water is gonna continue to corrode that aluminium

Replace those cheap orings with some quality Viton orings,you will be a happy camper. 😁

Any email where I can contact you?

👍

Sambo, I have a question that's got me bewildered regarding these Yong Heng compressors. I was following along with your video and when you split the head and removed the upper part of it ( around the 11:40 mark) I noticed that the reed valve is totally different than the one I saw in another KZfaq video that I watched. In that one he also has a Yong Heng and tears it down. I was under the belief that they were all the same design other than voltage, safety shut off options, etc., but now I see there are other differences as well i.e. the reed valve. If you wouldn't mind and get the time could you possibly watch this video ( kzfaq.info/get/bejne/hbuJnNaWqtOpfnU.html). It starts at about the 4:00 minute mark with the head removal. I'm curious to see what you think about the differences. Both of your videos are from around the same date so I'm thinking they are both about the same age. Thanks a bunch my friend!

It's simply a mod fridge compressor technology

Hello, ive bought one of these and after just 10 charges of my fx impact mk3 the pump won't compress at all.. typical ch**ese crap, but air is escaping from the first stage safety valve.. that red capped valve on the left ..i ordered a spare from the internet but as there is no information on the rating (pressure) of the yong heng one I have no idea if the one I ordered is the correct pressure, and it blows off even more !!! i think it was rated at 175 psi ..so the question is why does the safety valve blow, Im pi**ed off that after just 50 minutes of run time over 10 days its allready junk..and planning to get a ful refund..the importer doesnt have any spares !!! nice so they are just as bad...however looking at the videos I have seen it looks like the only solution to filling your own gun directly is to buy a chinese one and nurse it continously repairing it every 50 minutes !! Has anyone had this 1st stage failure ? and what was the cause ? as no one else makes a decent afordable compressor under 2500 euros (yes im in france) li looks like ill be taking it apart constantly to repair it .. colin

Cure for all the regular messing about is to buy the regular hand pump set it up on a cam like a steam engine cylinder and run it at a slow speed. reliability one hundred percent. life span for ever. servicing a few drops of oil on moving parts every few months.

looking at the aluminium corrosion maybe we should be using good quality antifreeze or coolant inhibitor . I have always drained my cooling pump after use .. maybe it would be better to use an inhibitor , My 20 year old VW Caravelle water pump and cast iron cylinder were spotless after over 200,000 miles I use the best quality antifreeze .and there is no sign of any corrosion or rust .

tick tock tick tock you have a loud clock

dude i spent an hour and a half trying to remove that piece of shit little plastic seal, the hose crushed it completely flat and i couldnt get any air out of the pump, it'd go straight to 4k psi and shut off. I didn't even put a new one back, not even sure why it's there to be honest, the dowty seal should seal everything just fine.

Can't hear what you are saying

No water... = overheat....

Hmmmm??? No replies???

sorry but pcp air guns are just a big brother to the muli pump air guns...just look at the aspen pcp air gun...you can pump it up...pcp air guns oh here is a 400 dollar gun but you will need a 1000 dollar air compressor and a 500 dollar air tank...what a joke

на кой хрен разбирал, не понятно