Dang Yong Heng

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Kayakairgun

Member
Oct 27, 2017
113
5
Texas
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!
e05030eafb7072b969bf3d254f2b0753.jpg

Broke 2nd stage piston....
 
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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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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