GX CS4 Pressure Problem

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Trampus99

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Aug 22, 2022
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Louisville Tn USA
I have had a CS4 for about a year and it has worked great, about 12 hrs on it. A month or so back I was filling a few guns and after the first one ( that filled fine ) I started another and everything looked and sounded fine but there was no pressure building? After turning it off and on several times it started building pressure fine? So now this has happened about 4 times. Sometimes just trying to fill a gun and sometimes trying to fill a second? Anyone experienced anything like this?

Thanks,
Chuck
 
Trampus99 said:
I have had a CS4 for about a year and it has worked great, about 12 hrs on it. A month or so back I was filling a few guns and after the first one ( that filled fine ) I started another and everything looked and sounded fine but there was no pressure building? After turning it off and on several times it started building pressure fine? So now this has happened about 4 times. Sometimes just trying to fill a gun and sometimes trying to fill a second? Anyone experienced anything like this?

Thanks,
Chuck
Click to expand...
Sounds like dirty check valve. Inspect and clean check valve under burst disk on top of compressor.
 
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Trampus99 said:
I have had a CS4 for about a year and it has worked great, about 12 hrs on it. A month or so back I was filling a few guns and after the first one ( that filled fine ) I started another and everything looked and sounded fine but there was no pressure building? After turning it off and on several times it started building pressure fine? So now this has happened about 4 times. Sometimes just trying to fill a gun and sometimes trying to fill a second? Anyone experienced anything like this?

Thanks,
Chuck
Click to expand...
A friend recently purchased a CS4-i and had similar problems right out of the box. GX advised him to test the compressor at 12 volts. He did, and it worked perfectly. The culprit was an out-of-spec power supply. It could be that, after a year, your power supply is failing. Try it at 12 volts.

JackHughs
 
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Video



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Sergey1972 said:
Sounds like dirty check valve. Inspect and clean check valve under burst disk on top of compressor.
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I've had my CS4-I for less than 6 months. I had this same issue, no pressure. So, I followed this advice and it solved my problem. I couldn't believe how dirty the check valve was under the burst disc being less than 6 months old. Thank you.
 
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iFish said:
I've had my CS4-I for less than 6 months. I had this same issue, no pressure. So, I followed this advice and it solved my problem. I couldn't believe how dirty the check valve was under the burst disc being less than 6 months old. Thank you.
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Do you know how many hours of use your machine had when you cleaned the check valve?
 
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F6Hawk said:
Do you know how many hours of use your machine had when you cleaned the check valve?
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Yep, I put an hour meter on it not long after purchase (I had maybe an hour of use before adding the hour meter) as I knew I wouldn't be able to track when I needed to turn the grease knob. It had approx. 4 to 4.5 (my meter was reading 3 +/-) hours on it. Those hours were put on it, 10-15 minutes at a time as that is how long I let the actual pump run before giving it a 10-15 minute break.
 
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My almost new CS4-i used to fill my Ghost three times turned off at about 100 bar on the fourth time I was filling the Ghost. Auto shutoff gauge was set for 250 bar. Turned it off and back on and it continued to fill the Ghost to 250 bar.

Concerned about the early shut off I followed the instructions here and my check valve was smeared with grease. Took four Q-tips, both ends, to get it clean. Did not need air in the Ghost so I did a deadhead pressure check. The pump sounded better and filled the whip quicker than when I did the initial start up check to record the time. Gun is about halfway to needing a pressure so will be a few days before I check the pump doing a fill.
 
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I'm going to make a huge guess here.

I have a CS4-i. MY shutdown procedure is to close the tank valve and then use the compressor bleed valve to shut down the compressor. This allows the compressor to immediately purge the internal plumbing. I then allow the compressor to run "no-load" for a few minutes to cool off before pushing the "off" button.

My guess is that the immediate purge with the compressor running no-load helps prevent build-up at the check valve.

JackHughs
 
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JackHughs said:
I'm going to make a huge guess here.

I have a CS4-i. MY shutdown procedure is to close the tank valve and then use the compressor bleed valve to shut down the compressor. This allows the compressor to immediately purge the internal plumbing. I then allow the compressor to run "no-load" for a few minutes to cool off before pushing the "off" button.

My guess is that the immediate purge with the compressor running no-load helps prevent build-up at the check valve.

JackHughs
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Interesting theory. To date I have used my CS4-i only to fill my Ghost directly as I have not bought a tank yet. I am thinking that releasing the whip pressure after a direct fill of a gun with a backflow preventer/check valve is the same thing as closing the valve on a tank before releasing the whip pressure.

With the very low time on my CS4-i I believe mine came from the factory with grease on the internal check valve assembly.
 
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JackHughs said:
I'm going to make a huge guess here.

I have a CS4-i. MY shutdown procedure is to close the tank valve and then use the compressor bleed valve to shut down the compressor. This allows the compressor to immediately purge the internal plumbing. I then allow the compressor to run "no-load" for a few minutes to cool off before pushing the "off" button.

My guess is that the immediate purge with the compressor running no-load helps prevent build-up at the check valve.

JackHughs
Click to expand...
It actually prevents moisture condensation in cylinder as it cools. Running no load is good practice if the compressor will sit idle for more than a day. Otherwise you will have moisture in the cylinder and it will rust.
 
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