Vevor compressor failed

[hyperfluous]

I think the best luck you will have with getting a new second stage ring is from mylond air.. their main website goes up and down but here is one.. http//mylond.en.hisupplier.com/product-list3.html might be best to find someone from there to skype with or whatsapp

[msurf]

Thank you Dinh!  I guess I don't have a mystery compressor after all...

[WiseGuy]

Found this link online...should be helpful for future fixes...

http://zypcppump.com/what-i-need-to-do-when-the-pcp-compressor-can-not-filling/

[Ydoggy]

Great thread and I appreciate all of the useful info.  I "accidentally" bought the vevor instead of the yong heng and have had build up issues. 

I ran through all of the trouble shooting which includes:
A)  soap water check for external leaks
B)  burst disk check
C)  conical/rubber check valve inside of the 2nd stage line and fitting.  Replaced
D) removed all lines, cleaned and checked for obstructions
E) replaced the oring and checked/cleaned the parts between both cylinders (requires hex fasteners removal)

I attempted to replace the top piston seal as there seemed to be excessive play (diametrical), but I managed to strip the Phillip's head screws and its locked tight.  This could be the cause of the issue preventing pressure build past 300psi or so.

So question to all:
Any other ideas on things to look for?
At only $200, should I buy another Vevor and have this for spares?
At another $200 should I buy a legit Yong Heng or other off brand chinese?

Thoughts?  Appreciate the information on this.

Thanks!

[Ydoggy]

Perhaps an additional question are for spare parts... know any sources that has spare parts, namely a piston assembly?

[Tonykarter]

Mine should be here Thursday.  Should I refuse shipment and just get the YH?

[Harpoon1]

Great thread and I appreciate all of the useful info.  I "accidentally" bought the vevor instead of the yong heng and have had build up issues. 

I ran through all of the trouble shooting which includes:
A)  soap water check for external leaks
B)  burst disk check
C)  conical/rubber check valve inside of the 2nd stage line and fitting.  Replaced
D) removed all lines, cleaned and checked for obstructions
E) replaced the oring and checked/cleaned the parts between both cylinders (requires hex fasteners removal)

I attempted to replace the top piston seal as there seemed to be excessive play (diametrical), but I managed to strip the Phillip's head screws and its locked tight.  This could be the cause of the issue preventing pressure build past 300psi or so.

So question to all:
Any other ideas on things to look for?
At only $200, should I buy another Vevor and have this for spares?
At another $200 should I buy a legit Yong Heng or other off brand chinese?

Thoughts?  Appreciate the information on this.

Thanks!

Sounds like you got a real lemon, bummer. I'd at least wait and see if Travis of JSAR comes through with
His After market piston seals. Without them, I would not even entertain getting another one. IMO 😁

Im still getting up to speed with these compressors but it seems like YH has better support for spare parts and without them, what good is anything?

If I could do it over, Id just pay the difference and get a YH.

[Tonykarter]

Requested a return, even before it is scheduled to be delivered Thursday, and I will be at home when my UPS guy brings it.  He shoots an R9 and is cool, so I should have not problem refusing delivery. 

All I need now is a link to the best Yong Heng on AliExpress so I can order it.  Which one?  Buy once, cry one.

[Harpoon1]

Requested a return, even before it is scheduled to be delivered Thursday, and I will be at home when my UPS guy brings it.  He shoots an R9 and is cool, so I should have not problem refusing delivery. 

All I need now is a link to the best Yong Heng on AliExpress so I can order it.  Which one?  Buy once, cry one.

Your killing me! 

[Scotchmo]

Great thread and I appreciate all of the useful info.  I "accidentally" bought the vevor instead of the yong heng and have had build up issues. 

I ran through all of the trouble shooting which includes:
A)  soap water check for external leaks
B)  burst disk check
C)  conical/rubber check valve inside of the 2nd stage line and fitting.  Replaced
D) removed all lines, cleaned and checked for obstructions
E) replaced the oring and checked/cleaned the parts between both cylinders (requires hex fasteners removal)

I attempted to replace the top piston seal as there seemed to be excessive play (diametrical), but I managed to strip the Phillip's head screws and its locked tight.  This could be the cause of the issue preventing pressure build past 300psi or so.

So question to all:
Any other ideas on things to look for?
At only $200, should I buy another Vevor and have this for spares?
At another $200 should I buy a legit Yong Heng or other off brand chinese?

Thoughts?  Appreciate the information on this.

Thanks!

Plug the line to test. A Foster plug comes in the kit with the Vevor that I bought.

If it reaches that  300psi very quickly (couple seconds), it could be the seal on the screw that you stripped.

If it is pumping up very slowly, and only reaches 300 psi or so, re-check (C) the conical/rubber check valve. Make sure is actually sealing. And make sure the spring is not broken.

[Ydoggy]

Scotchmo, I think you hit it right on.   It's hard to register 300 psi being so small relative to rated capability.  But I would judge that it does come to pressure quickly. 

These things are dangerous, equally for the dangerous pressures,  but the temptation of such a simple machineat such a low cost.  Being able to purchase 3 at the price of 1 perhaps higher quality build almost makes the risk worthwhile.  The likely failure modes being mostly repairable.   

I'll play around withit more and see if I can finagle a solution.

I also didn't check the main piston things and I'll do that as well.

I may also consider a different head style which was the original post.

Thanks again!

[Ydoggy]

One side note worth mentioning relating to the reliability was my original issue was a motor startup issue likely related to test oil residue in the upper chambers.  I gave them a 1 star on Ebay willing to increase based on some technical assistance.

Instead the ebay seller offered 5% refund for the other 4 stars without answering my support question.  That included a sob story of how they are a start up trying to sell product

I checked and they renewed their account under a different seller and have over 95% on less than 10 ratings... not sure how the math works.

I fully am aware of buyer risk, but is interesting how this game is played on that market.

[Ydoggy]

Just an update:

Determined the low pressure issue (this time) was in fact the 2nd stage piston seal that comes with 2 replacements.  Had a bugger of a time getting that phillips screw off... since I already damaged the Phillip's slot I ended up tearing the worn seal off and taking some vice grips for the added torque.  With all of the loctite they used I should have torched it beforehand.  Odd they used heavy handed loctite for an intended serviceable joint.  The amount of torque I applied nearly sheared the screw off, but managed to come loose. 

Once put back together to test, the seal is extremely tight that the motor wouldn't start initially.  So I had to hand crank the drive motor until it worked itself into the bore a few cycles.  Then it ran like a champ and built pressure faster than when I first received it.  I now have several leaks at several joints, but minor and tightened them enough to start filling my empty cylinder.

All the answers for my issue were within this thread and thanks again for the second opinions.  Saved me from spending for another compressor although I don't see this one lasting very long.  I don't use a lot of air so I'm not complaining.  Appreciate the help. 

Again it's a simple machine with most of the failure modes fixable for most willing to spend the time.  Let's hope I can hobble this latest fix for a longer period of time before the thing breaks again.  Hopefully by then there will be more spare parts around.

Thanks again.  Shoot me a note of there are any others needing some pointers on this compressor.  But seems there's a few out there already with s solid knowledge base not just for this head design, but also for the YH and the Tux.

[Tweeter]

Requested a return, even before it is scheduled to be delivered Thursday, and I will be at home when my UPS guy brings it.  He shoots an R9 and is cool, so I should have not problem refusing delivery. 

All I need now is a link to the best Yong Heng on AliExpress so I can order it.  Which one?  Buy once, cry one.

Why don't you ask the UPS guy if he wants to buy a cheap compressor, maybe he is looking to come over to the darkside. 

[Scotchmo]

Just an update:

Determined the low pressure issue (this time) was in fact the 2nd stage piston seal that comes with 2 replacements.  Had a bugger of a time getting that phillips screw off... since I already damaged the Phillip's slot I ended up tearing the worn seal off and taking some vice grips for the added torque.  With all of the loctite they used I should have torched it beforehand.  Odd they used heavy handed loctite for an intended serviceable joint.  The amount of torque I applied nearly sheared the screw off, but managed to come loose. 

Once put back together to test, the seal is extremely tight that the motor wouldn't start initially.  So I had to hand crank the drive motor until it worked itself into the bore a few cycles.  Then it ran like a champ and built pressure faster than when I first received it.  I now have several leaks at several joints, but minor and tightened them enough to start filling my empty cylinder.

All the answers for my issue were within this thread and thanks again for the second opinions.  Saved me from spending for another compressor although I don't see this one lasting very long.  I don't use a lot of air so I'm not complaining.  Appreciate the help. 

Again it's a simple machine with most of the failure modes fixable for most willing to spend the time.  Let's hope I can hobble this latest fix for a longer period of time before the thing breaks again.  Hopefully by then there will be more spare parts around.

Thanks again.  Shoot me a note of there are any others needing some pointers on this compressor.  But seems there's a few out there already with s solid knowledge base not just for this head design, but also for the YH and the Tux.

Now that you have that stripped screw replaced, the next time will be easier. And I don't think that it is necessary to remove the upper cylinder to do so. Remove just the upper head. Rotate the fan until it is at top dead center. Remove the retaining screw and use a pick to pull the seal out. When you install the new seal, if you tighten the screw as tight as possible, the pump may be very difficult to turn. Tightening the screw expands the seal somewhat.  Backing off on the screw a little bit lets the pump turn over easier. Test by rotating with the motor fan blade. You could use some low strength loc-tite if you are worried about the screw loosening up.

[Tweeter]

I recently had my compressor apart after I had previously removed the screw and seal and the screw on mine was just starting to loosen itself.  I would recommend using loctite even though it might make it difficult to remove (use a little heat) at least it prevents the screw from falling out and causing havoc on your top end

[tracker1955]

Due to the heat produced you may want to select a high temp loctite.

[Fly]

Well I ordered one earlier this week. It will most likely be a Vevor compressor. I plan to disassemble it Deburr everything clean &
put back to gather. Then break it in with no pressure for 30 min. Now when I get into it I,m going to see what you guys have talked
about. I,m a retired tool & die maker with a small machine shop be side my house. I,m new to pcp air gun & these compressors. But
after looking at these, I might able to make some of these plastic parts. I think this thread should be made a sticky on the form.

I have read this whole thread & leaned a bunch not even having one yet. I will let you guys know when I get mine & see if there is any
thing I could make that can't be bought. I,m in NO WAY trying to get back into business making parts. That why I,m retired. But if I can
help some of you I will. 

                                         Fly

[Xraycer]

Well I ordered one earlier this week. It will most likely be a Vevor compressor. I plan to disassemble it Deburr everything clean &
put back to gather. Then break it in with no pressure for 30 min. Now when I get into it I,m going to see what you guys have talked
about. I,m a retired tool & die maker with a small machine shop be side my house. I,m new to pcp air gun & these compressors. But
after looking at these, I might able to make some of these plastic parts. I think this thread should be made a sticky on the form.

I have read this whole thread & leaned a bunch not even having one yet. I will let you guys know when I get mine & see if there is any
thing I could make that can't be bought. I,m in NO WAY trying to get back into business making parts. That why I,m retired. But if I can
help some of you I will. 

                                         Fly

Excellent!

[bandg]

Just an aside tip-when you have a screw set with loctite in a small space a soldering iron on the screw will usually loosen it effectively.