New Style Chinese Compressor

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gerf

gerf

Member
Nov 11, 2018
3
1
Colorado
Hi all. Just took delivery of a new style Chinese compressor. A H Hukoer Adjustable Auto-Stop 300BAR 30MPA 4500PSI High Pressure Air Compressor with Auto Shut Off. Basic style like most of the Chinese compressors, except it has a completely redesigned piston head. No more metal tubes, the pressure gauge sits on top of the cylinder. "Beefier" looking head, but time will tell how it holds up. And I got it from Amazon, 2 day shipping with my Prime Account. https://www.amazon.com/gp/product/B07H8HKN1X/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

I'll try to post updates on how it works out. For now I don't have any tanks, will be filling up a couple of PCP guns I own. Need to go out and purchase some hydraulic oil first. Yeah, I got brave and decided to be the first to try one out, no reviews at all yet. If it's junk, hopefully Amazon will let me return it without a lot of hassle.

Later,

Jerry Sharp


 
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The gauge reads 6000psi in the pic but doesnt show the plug well it is similar to the Yong Heng but a different head design looks like. I been useing my 220 v Yong Heng for a year? maybe but its starting to take longer to fill my 109cu/ft cf tank so i might be replacing it. Let us know what you think of this one.BTW i use a 7lb bag of ice in a 5gal bucket with a couple inches of water to keep the unit cool. It runs 40mins straight without over heating, also bought a tile wet saw pump from home depot (royobe) for like 12 bucks puts out more water.

Thanks
 
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Since I'm assuming they're using an AC induction motor it's RPM is based offline frequency. My belief is these Chinese compressors are specting a 50 hertz motor running in the US at 60 hertz. So running of the compressor of the u.s. is running the pump back 6/5 is designed RPM Even at the design RPM I'm a big fan of any of these direct drive Piston Pumps running the pistons at those RPMs is not conducive to long life. Running them Faster by 20% is even worse.
 
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Don’t use hydraulic oil!!! Use 100% synthetic air compressor oil.
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Does that prevent dieseling? Or just better for lubrification?
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^This, a million times over this. 

I genuinely don't want to step on anyone's toes, but I do want to quickly touch on the "why" of using compressor oil. 

Oils are highly engineered products. We truly live in a time of miracle and wonder with this stuff. I noticed the seller said to use motor oil. You do NOT want to use motor-oil. The reason for this, among a dozen different things, is that a motor oil is a "detergent" oil. This means it has cleaning agents in it which can and will eat away at various components. In your motor it is meant to prevent carbon buildup, but you're not creating any carbon here, so it'll only eat away at various parts you don't want it to. 

Hydraulic oil DOES lubricate, very well in fact. It has some pretty crazy properties actually. A hydraulics engineer could get into it more, but the punchline here is that hydraulic oil is typically run in full immersion applications. It isn't bad for your compressor like a regular detergent motor oil is (to my knowledge anyway), but it just isn't right for the application. 

What you want is a non-detergent compressor oil, if you really want to be good to your compressor a full synthetic like Royal Purple would be the win. This is the kind of thing it is meant for. As an aside, synthetic oils are broadly "better" because they tend to be slicker (more lubricious) and don't break down (change viscosity and lose performance) over time as rapidly as the good 'ol fashioned dino-squeezings oils. I'm pretty dubious any of these cheap chinese compressors will last long enough for the rings to be what goes, especially since on my Yong Heng one by one pretty much all the electronics have poop the bed until now the only original functional electrical components are the start cap and temp sensor, but I would very much love to be wrong so we shall see. Giving it the good stuff means it has the best chance possible anyway. *shrug* 


As an aside, if I'm wrong about any of this, please pop in and correct me. I don't just want to avoid putting out false information, I want to to learn. Hydraulics/pneumatics/lubricants are not my area of expertise, I merely dabble. 
 
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I totally agree that synthetic compressor oils such as Royal Purple, Chemlube 750, Bauer 0019 and 0024, etc. should be used in 4500 psi compressors. Motor oil and hydraulic fluids are not the wisest lubricant choices. The problem is compressor buyers follow the improperly written operating manuals that accompany compressors like the Yong Hengs, Tuxings, and the Air Venturi. They advise owners to use #46 hydraulic oil or multi-viscosity non detergent motor oil. Compounding the problem is that buyers are attracted to bargain priced compressors because they are trying to save money. Buyers want to budget by getting a cheap compressor and the least expensive lubricant to offset the high total cost of PCP rifles, $$ carbon fiber fill tanks and fill yoke assemblies.

To each his own but $200-300 dollar compressors are a false economy. Its equivalent to a expecting a pony to pull a freight wagon. He might pull for a few days but he's going to die young. I'd rather have one reliable well designed compressor that is built to run for years than a bunch of $200-300 compressors that are built cheap, leave out essential components, are over revved, and likely to fail sooner rather than later. Cheap oil in a cheap compressor only lessens its already short life span. You get what you pay for in compressors and compressor lubricants.
 
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