Cat310 Pressure Drop

[rshiggaon]

Hello, A few of my pumps are currently reading around 975 PSI when the trigger is pulled and about 1300 PSI when the trigger is released. I have JC set up, and three months ago, they were reading a consistent 1100 PSI. There is no noticeable pulsation in the system.

• Is it normal for the pressure to decrease over time?
• Should I start by replacing the pressure regulator, and then move on to inspecting and possibly replacing the high-pressure seals? For context, I replaced the regulators on both pumps in October of last year.

Thank you.

 

[Blanco]

Have you tried adjusting you regulators to your desired pressure?

 

[rshiggaon]

Yes, it does not change. I forgot to mention it.

 

[Randy]

When was the last time you changed your nozzles? We used a 1505 nozzle, gives the feeling of more power.

 

[rshiggaon]

Maybe less than 1 year old. I have 1508 tip.

 

[Blanco]

If you replaced the regulators on both pumps recently then there is no reason they should be going bad.

Check and make sure your presoak bypass solenoid is closing fully when HP rinse is engaged.

 

[Roz]

Curious how your reading was consistent with trigger pulled. Not familiar with JC’s system. An 08 on our KleenRite system would show a drop of 300-350psi from not pulled handle to the pulled handle psi. A tip of 05 is usually a drop of 100-150 psi. Awhile back I ran an experiment with different tips to see/measure the drop change.

 

[rshiggaon]

If you replaced the regulators on both pumps recently then there is no reason they should be going bad.

Check and make sure your presoak bypass solenoid is closing fully when HP rinse is engaged.

Good Point, will do and update here. I dislike the presoak setup on JC; it's overly complicated. I wish they had done it the same as the tire cleaner.

 

[Greg Pack]

Good Point, will do and update here. I dislike the presoak setup on JC; it's overly complicated. I wish they had done it the same as the tire cleaner.

I recently changed my Coleman medium pressure to low pressure. Wish I had done it years ago.

 

[rshiggaon]

I recently changed my Coleman medium pressure to low pressure. Wish I had done it years ago.

Planning to do it end of this year. Did you make it come out of the trigger gun or triple gun?

 

[Greg Pack]

The trigger gun. I built a low pressure setup and used a flojet. I mounted it on a plastic white cutting board I bought at Sams Club for $10. I used 3/8" poly to the bays and the flow is pretty decent.

 

[rshiggaon]

Good Point, will do and update here. I dislike the presoak setup on JC; it's overly complicated. I wish they had done it the same as the tire cleaner.

I checked the pre-soak bypass solenoid, and it was not opening—nothing came through it when the rinse function was activated. I also tested the high-pressure regulator by installing a new one, but the issue persisted. The CAT pump valves appeared fine; I cleaned them thoroughly and reinstalled them.


Currently, I cannot increase the pressure beyond 975 psi, though I can lower it. The next logical step is to check the high-pressure seals in the CAT pump. Is there anything else I might be overlooking? One of the pump HP seals was replaced last September, so I was scratching my head as to why it would go bad so soon.

Do you guys see an issue keeping my pumps at 1100 PSI, my tech was saying that is high and usually burns out the HP seals soon.

 

[Randy]

I checked the pre-soak bypass solenoid, and it was not opening—nothing came through it when the rinse function was activated. I also tested the high-pressure regulator by installing a new one, but the issue persisted. The CAT pump valves appeared fine; I cleaned them thoroughly and reinstalled them.


Currently, I cannot increase the pressure beyond 975 psi, though I can lower it. The next logical step is to check the high-pressure seals in the CAT pump. Is there anything else I might be overlooking? One of the pump HP seals was replaced last September, so I was scratching my head as to why it would go bad so soon.

Do you guys see an issue keeping my pumps at 1100 PSI, my tech was saying that is high and usually burns out the HP seals soon.

You need to replace your seals, all of your seals. When you replace the seals in the pump you should always replace all of them at the same time. There's no problem running your pumps at 1100 PSI, whoever told you that is wrong. I run my pumps at 1400-1500 PSI all the time and I don't have a lot of seal problems.

 

[rshiggaon]

I did replace all the HP seals last time. But thank you for your thoughts.