eBay compressor

[Jman2311]

I am glad you got it back on line. Good info to share👍🏾. How did you come to that diagnosis? Where did you get the Parts? Is your compressor a single cylinder?

Call it a lucky guess.  I have removed the head already about about 5 0.35L tank fills to 300 bar just to check for dieseling and oil blowby.  Yes I had plenty to clean out on that initial teardown.  I guess I messed up the 2nd stage rings in that process.  Anyways I checked the capacitor and it was within 5% tolerance of its rating (if memory serves it is a 120 micro farad), Checked the amperage with no load and under load and found when it got to about 3300psi the amps would go up and trip the overload.  The only thing that I could figure was that high pressure air was getting into the low pressure cylinder by way of the rings and causing the overload.  Guess I was right.  She's running along well again after a replacement of the rings. 

If you need any parts I have seen quite a bit from SBtech and LG on aliexpress.  pistons, gaskets, cylinders, whole head assemblies, etc.  Seems that even if this compressor dies it can be repaired.

[kzz1kaw]

I am glad you got it back on line. Good info to share👍🏾. How did you come to that diagnosis? Where did you get the Parts? Is your compressor a single cylinder?

Call it a lucky guess.  I have removed the head already about about 5 0.35L tank fills to 300 bar just to check for dieseling and oil blowby.  Yes I had plenty to clean out on that initial teardown.  I guess I messed up the 2nd stage rings in that process.  Anyways I checked the capacitor and it was within 5% tolerance of its rating (if memory serves it is a 120 micro farad), Checked the amperage with no load and under load and found when it got to about 3300psi the amps would go up and trip the overload.  The only thing that I could figure was that high pressure air was getting into the low pressure cylinder by way of the rings and causing the overload.  Guess I was right.  She's running along well again after a replacement of the rings. 

If you need any parts I have seen quite a bit from SBtech and LG on aliexpress.  pistons, gaskets, cylinders, whole head assemblies, etc.  Seems that even if this compressor dies it can be repaired.

Can you post a link for the parts so others that may need parts can go to the link. Have you tried filling past 3300 after the rebuild? Is the compressor a two cylinder or one?

[Jman2311]

Mine is single cylinder tuxing style.  Large water cooled head.  As for the links,  not sure how to do that for the whole store.  Look st the sbtech store and the LJ high pressure store on aliexpress.  You can click on the compressor like you have and click on the seller, it should take you to there store.  Hope this helps.

Also, yes.  I have filled up to 300 bar on a 68 cu in bottle.  Seems to work just as good as ever.

[Killfire]

I am glad you got it back on line. Good info to share👍🏾. How did you come to that diagnosis? Where did you get the Parts? Is your compressor a single cylinder?

Call it a lucky guess.  I have removed the head already about about 5 0.35L tank fills to 300 bar just to check for dieseling and oil blowby.  Yes I had plenty to clean out on that initial teardown.  I guess I messed up the 2nd stage rings in that process.  Anyways I checked the capacitor and it was within 5% tolerance of its rating (if memory serves it is a 120 micro farad), Checked the amperage with no load and under load and found when it got to about 3300psi the amps would go up and trip the overload.  The only thing that I could figure was that high pressure air was getting into the low pressure cylinder by way of the rings and causing the overload.  Guess I was right.  She's running along well again after a replacement of the rings. 

If you need any parts I have seen quite a bit from SBtech and LG on aliexpress.  pistons, gaskets, cylinders, whole head assemblies, etc.  Seems that even if this compressor dies it can be repaired.

Can you post a link for the parts so others that may need parts can go to the link. Have you tried filling past 3300 after the rebuild? Is the compressor a two cylinder or one?

I just purchased 3 lots of 10each rubber compressor rings from sb tech https://m.aliexpress.com/s/item/32761293607.html?trace=wwwdetail2mobilesitedetail&productId=32761293607&productSubject=two-stage-piston-ring-for-compressor-piston-rings-10-piece-lot#autostay. I also spent about an hour and a half today messing with my compressor. I snapped off an unused mounting tab to make it easier to pull the cover off and I also cut another retaining ring grove into the motor shaft. I'll try and take pictures tomorrow. The retaining ring groove is critical for the safety and security of the compressor. Without it my fan walked into the motor frame and began to shred itself.

[kzz1kaw]

Killfire do you have a problem with your compressor? Which one do you have? Is your compressor apart now where you can take some pics? That is a small piston for the rings in the link?😳

[Killfire]

Killfire do you have a problem with your compressor? Which one do you have? Is your compressor apart now where you can take some pics? That is a small piston for the rings in the link?😳

Its back together but doesn't take more than 5 minutes to open it back up. I have the tuxing. Any specific pictures your wanting? Yes those rings are for the second stage brass piston. They don't seem to last long or I'm opening mine up too often haha.

[kzz1kaw]

Killfire do you have a problem with your compressor? Which one do you have? Is your compressor apart now where you can take some pics? That is a small piston for the rings in the link?😳

Its back together but doesn't take more than 5 minutes to open it back up. I have the tuxing. Any specific pictures your wanting? Yes those rings are for the second stage brass piston. They don't seem to last long or I'm opening mine up too often haha.

I am trying to visualize what you are talking about with the compressor. Short of me taking mine apart, there is only one piston right. Correct me if I am wrong, there is a top and bottom rings? If you have anymore problems, can you take some pics and post for all to see would be 👍🏾

[Jman2311]

I think a lot of the failures come from us taking the thing apart.  I am not seeing people complaining about failures with the units unless the user has taken it apart.

There is only 1 piston but you have to think of it like 2.  There is a brass piston that is mounted top center on the regular piston.  The 2 sections of the single piston operate in 2 different stages.  The main piston drives air into the second cylinder that is in the water cooled head.  The main piston does have 3 rings and the brass piston has 4.  The brass piston rings are not rubber.  Below is a link to the piston should you ever need to buy one.
https://www.aliexpress.com/store/product/single-cylinder-pcp-pump-part-300-bar-4500psi-compressor-piston-and-rocker-1-piece-lot/2653128_32796439065.html?spm=2114.12010608.0.0.aYRRVz

Also here is a link to the SB tech store.  They seem to have the best selection and price for parts.
https://www.aliexpress.com/store/2653128?spm=2114.12010108.0.0.FRra9v

[kzz1kaw]

I think a lot of the failures come from us taking the thing apart.  I am not seeing people complaining about failures with the units unless the user has taken it apart.

There is only 1 piston but you have to think of it like 2.  There is a brass piston that is mounted top center on the regular piston.  The 2 sections of the single piston operate in 2 different stages.  The main piston drives air into the second cylinder that is in the water cooled head.  The main piston does have 3 rings and the brass piston has 4.  The brass piston rings are not rubber.  Below is a link to the piston should you ever need to buy one.
https://www.aliexpress.com/store/product/single-cylinder-pcp-pump-part-300-bar-4500psi-compressor-piston-and-rocker-1-piece-lot/2653128_32796439065.html?spm=2114.12010608.0.0.aYRRVz

Also here is a link to the SB tech store.  They seem to have the best selection and price for parts.
https://www.aliexpress.com/store/2653128?spm=2114.12010108.0.0.FRra9v

Thank you for the links on the rebuild for future references. As I look at my compressor, the finned cylinder is the first stage followed by the second stage the top portion with the water lines?

[Jman2311]

That is correct.

[Killfire]

I think a lot of the failures come from us taking the thing apart.  I am not seeing people complaining about failures with the units unless the user has taken it apart.

There is only 1 piston but you have to think of it like 2.  There is a brass piston that is mounted top center on the regular piston.  The 2 sections of the single piston operate in 2 different stages.  The main piston drives air into the second cylinder that is in the water cooled head.  The main piston does have 3 rings and the brass piston has 4.  The brass piston rings are not rubber.  Below is a link to the piston should you ever need to buy one.
https://www.aliexpress.com/store/product/single-cylinder-pcp-pump-part-300-bar-4500psi-compressor-piston-and-rocker-1-piece-lot/2653128_32796439065.html?spm=2114.12010608.0.0.aYRRVz

Also here is a link to the SB tech store.  They seem to have the best selection and price for parts.
https://www.aliexpress.com/store/2653128?spm=2114.12010108.0.0.FRra9v

Thanks Jeremy, I agree that mine taking apart has probably caused more wear than not but that's just my nature to pull things apart. At least I understand the inner workings now so that's a plus.

My piston only has 2 second stage rings. Do you know what material they are? I don't think they're rubber but maybe a type of plastic composite?

I've ordered all my parts from the sb store. Shipping is pretty quick and they're helpful.

[MJP]

They are metal infused ptfe.

Marko

[Killfire]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

[kzz1kaw]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

I see the pvc but, are the two smaller pieces on the left appear to be solid plastic? Maybe it's my eyes but it appears to be solid?

[Killfire]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

I see the pvc but, are the two smaller pieces on the left appear to be solid plastic? Maybe it's my eyes but it appears to be solid?

Those are the cut pieces of cotton filter.

[Buldawg76]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

How tight does the PVC pipe fit inside the aluminum cylinder, is it a snug fit or is it smaller OD than the ID of the aluminum. If its a good bit smaller so there is room for it to expand to the ID of the aluminum cylinder it could crack or break apart causing contamination of the air supply. That or the o rings will blow out first so the air bypasses the medium like intended.

Hopefully its a snug fit so it does not have room to expand or break apart from the HPA. The parts rated to the 4500 + psi is the aluminum cylinder and end caps so if the PVC can expand either it will or the o rings will blow either way rendering the filter useless on first fill.

Mike

 

[Killfire]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

How tight does the PVC pipe fit inside the aluminum cylinder, is it a snug fit or is it smaller OD than the ID of the aluminum. If its a good bit smaller so there is room for it to expand to the ID of the aluminum cylinder it could crack or break apart causing contamination of the air supply. That or the o rings will blow out first so the air bypasses the medium like intended.

Hopefully its a snug fit so it does not have room to expand or break apart from the HPA. The parts rated to the 4500 + psi is the aluminum cylinder and end caps so if the PVC can expand either it will or the o rings will blow either way rendering the filter useless on first fill.

Mike

Its not snug where it won't slide out but there is resistance to it. I think it's near a perfect fit.

[Buldawg76]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

How tight does the PVC pipe fit inside the aluminum cylinder, is it a snug fit or is it smaller OD than the ID of the aluminum. If its a good bit smaller so there is room for it to expand to the ID of the aluminum cylinder it could crack or break apart causing contamination of the air supply. That or the o rings will blow out first so the air bypasses the medium like intended.

Hopefully its a snug fit so it does not have room to expand or break apart from the HPA. The parts rated to the 4500 + psi is the aluminum cylinder and end caps so if the PVC can expand either it will or the o rings will blow either way rendering the filter useless on first fill.

Mike

Its not snug where it won't slide out but there is resistance to it. I think it's near a perfect fit.

Have you filled a tank or gun with it in the filter housing yet to know if it holds up and stays sealed with the o rings properly. Just curious if it works as intended since I may look at doing it that way as well since it will reduce fill times by decreasing the internal volume of the filter.

Mike

[Killfire]

Here's what I did for the gold filter.
1" schedule 40 pvc with ~ 2" sections of cotton filter sandwiching the dessicant. Orings on the ends to seal the pvc.

How tight does the PVC pipe fit inside the aluminum cylinder, is it a snug fit or is it smaller OD than the ID of the aluminum. If its a good bit smaller so there is room for it to expand to the ID of the aluminum cylinder it could crack or break apart causing contamination of the air supply. That or the o rings will blow out first so the air bypasses the medium like intended.

Hopefully its a snug fit so it does not have room to expand or break apart from the HPA. The parts rated to the 4500 + psi is the aluminum cylinder and end caps so if the PVC can expand either it will or the o rings will blow either way rendering the filter useless on first fill.

Mike

Its not snug where it won't slide out but there is resistance to it. I think it's near a perfect fit.

Have you filled a tank or gun with it in the filter housing yet to know if it holds up and stays sealed with the o rings properly. Just curious if it works as intended since I may look at doing it that way as well since it will reduce fill times by decreasing the internal volume of the filter.

Mike

Yup, I took that picture after topping off my guppy to 4500. If you do do this, I suggest leaving the cotton plugs sticking out 1/16" to help hold the Orings centered.

[Buldawg76]

That's a good idea with the paper filter plus it also keeps the sieve medium in place properly.

Mike