CPS 2000 Pump Problem

[Nemesis]

My 2000's pump has become VERY stiff, so much so that it takes almost a minute of straining to inch it along enough to pump it once. I have tried lubricating it, but that wasn't the problem. It sort of feels as if there is a vaccum that prevents it from moving, however the gun will, albeit slowly, pressurize and shoot. Suggestions?

[DX]

"If you experience an erection lasting longer than 4 hours, please seek immediate medical care".

If your gun does this when it's not pressurized at all, check the reservoir intake and the tubing leading up to the pump to make sure it's not clogged.

[soakinader]

Yeah, it sounds like there is something wedged into a valve somewhere. Is it difficult to move on both intake and output?

[TheSoaker]

I think if you shoot pressurized air through the intake of the pump it will dislodge anything jammed in the check valves.

[Nemesis]

It does this on both intake and output, and it does so even when the gun is empty and your only trying to pump air through it..... it doesn't look as if there is anything blocking it, but i will shoot some air through it like TheSoaker said.

[GJIV]

Pumping some air through the valve will not get it working again.

From experiences I guess there is something in one valve, but as it blocks in both ways you might have something between the valves, just beside the pump that blocks the flow into and out of the pump.

Best methode here is to open the gun, check the valves and the pump inside, check the tank and the intake-tube as also the tube going right out to the PC.

When there is nothing you can do so far, you can open the valve(quite heavy action, you can destroy everything here...)

Or you sell it to me, I will take it ! MAke me an offer when you cannot get it working again!

[the oncoming storm]

Could it be the pump O seal that's bad ?

For a year 2010-2011 I thought my CPS 1200 was broken, I couldn't move the pump in a lick but now it works fine. and has for 2 years running

[Nemesis]

Yeah i messed with it and the issue inproved considerably, still not the smoothest though.

[DX]

I tried to fix my last remaining 2500 tonight and it would not pressurize whatsoever. The pump was fine, but the PRV was kicking all the water back out. So, I opened her up and disabled the PRV. I stuck a drill bit through the hole and pressed on the 2nd check valve, it was completely stuck. After a few seconds of prodding, it came free and was able to be move normally. The gun would still not pressurize, so I replaced the O-ring on the reservoir connection. Now, with the 2nd check valve unstuck and full suction restored, the pump finally moves water in the right direction.

Fortunately, I tried this before considering the trigger valve, so I never had to saw that open. Unfortunately, in the process of looking for the blockage, I sawed a section of tubing right after the 2nd check valve that ended up not needing to be sawed. I have to glue that up pretty hardcore and hope there's no leaks. Otherwise, this thing works. I filmed a few parts of the repair and took pictures for an article on 2500 blockages. If your 2500 is stock, you can use a disabled PRV as an entry point to check (pun intended) on the 2nd check valve. You can check the 1st check valve without sawing anything, simply knock the screen out and stick something into the pipe that's long enough to reach the valve.

[the oncoming storm]

DX, lets hope my CPS 2500 that I'm buying doesn't have that problem. (Could you please give it a few pumps and find out?)