Dang Yong Heng

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    Kayakairgun
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    Well a few weeks ago my yong heng bit the dust., I was filling my 90 CI tank up and I heard the pump start to make a strange sound, like a change in pitch. I immediately shut down the pump. I pulled the head of the pump and look what I found!

    Broke 2nd stage piston….

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    Phreedom
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    How long have you had it and did you use it routinely? I’m been researching these, and a few others, and wondering about their durability. 

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    Kayakairgun
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    I guess 15 hours of hard use. I had a habit of pumping to 4800 PSI trying to get all I could out of my 90 CI bottle, not anymore. I only pump to 4400 PSI now.
    But over all I like my lil chain pump and how much more I can shoot. I say go for It If you can work on things and have good mechanical skills. Keep in mind its cheap and at some point in time she will need to be worked on.

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    Kayakairgun
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    New vs old

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    Phreedom
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    Thank you for that info

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    willy
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    That top piece acually  piece screw’s in,the 4 ring ring model is solid.Where did you get the second piston?

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    Kayakairgun
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    I ordered it form the same guy from china, the original vender I got the pump from on AliExpress. They sent me the whole rod and piston assembly. Ordering the part took about 15 days to get to me in texas.

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    Kayakairgun
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    Some pick for your viewing pleasure.
    Oil after 15 hours of use.

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    Kayakairgun
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    Small crack in the cover by bottom screw.

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    Kayakairgun
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    Some crank case shots.

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    Kayakairgun
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    Shot of the crank. Still smooth and nice.
     

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    Kayakairgun
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    Removing the piston.

    Rod surface is good too.

    Don’t lose those 2 small pins, there a slip fit.

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    Kayakairgun
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    New one going back in.
     

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    Kayakairgun
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    Back in business!!!

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    Eaglebeak
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    Did you replace the adjustable manometer with an auto stop one?

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    Kayakairgun
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    The original manometer started leaking, I think I bumped it with my wrench while working on the pump. I grabbed one off my hand pump untill I order a new one.

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    Eaglebeak
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    I noticed that it is different. I was thinking of disconnecting my auto stop gauge to enable it to fill to the full 4500 psi. But after seeing the top of your piston I think I’ll leave it be. It cuts out at about 290 bar. Did you replace the conrod? There was a lot of aluminum in your oil but you mentioned that the bearing surface was OK. Do you think that I could change my auto-stop version to an adjustable stop version by just replacing the gauge and cable?

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    Kayakairgun
    Participant
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    I think it would work. Probably just order you a adjustable stop gauge and swap it out for what you have now.
    The connection rod and pistons came as one unit. I ordered it like that.
    It what was in the bottom crank case looked like it was mostly from the 1st stage rings. 

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    Blackthunder
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    I do not own a Hong Yeng (yet). But from what  I understand, is that they are not meant to fill tanks, only guns / buddy bottles etc. Am I right about this?

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    Kayakairgun
    Participant
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    I think guns and tanks up to 1.5L. Some people fill bigger tanks and rest the pump every 15 minutes or so.

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