I have read a lot about problems with the disco pump. I have never owned a pump before, so I don't know if this is normal or not. My pump seems very stiff to operate, even when it is not connected to a gun. It also "floats" about 2" up form the bottom of the stroke when I'm pumping. I feel like my gun takes more pumps to fill the gun than others describe, but maybe not. I would like to take it apart and have a look around, but can't find any pictures when searching this forum. I know I've seen some before, but it looks like they've been deleted now. Any help or advice (other than buy a Hill, I know) would be greatly appreciated.

Thanks

Take a look at this old post:http://www.network54.com/Forum/581291/thread/1239659552/For+Gary%2C+pump+list
jeff

Thanks Jeff. I saw that post, but I was hoping someone could tell me if my pump is acting normal or if I should have a look at it. I also would like to know where to begin with the disassembly and maybe look at some photos of what I should expect.

Gary Hurley made up some o-ring kits, you might wanna shoot him an email and get a kit. Also after going through the Disco pump I have been using I decided to try some Mac1 secret sauce as a pump lube for the o-rings and sliding surfaces. The silicon grease recommended works good but the secret sauce is magic so far in my newly rebuilt pump. Basically the pump disassembly is fairly intuitive if you are mechanicly inclined. Start by undoing the set screw that holds the air inlet collar on right above the base. The set screw is under the air intake filter. Slide the collar up and then you can easily unscrew the pump from the base with a wrench on the brass fitting under that collar. Then its basically taking a wrench to the other brass fittings to disassemble it rest of the way. Be carefull not to nick any of the steel surfaces with the wrench. Dont lose the little check ball in one of the valves. A screw driver can be used to remove the circlip that holds the piece in the top valve. Use non chlorinated brake kleen to clean things carb cleaner will remove paint. USe silicon grease, found at plumbing supplies at lowes,home depot, or any hardware store. And then give all sliding areas a shot of some secret sauce and you will be surprised at how well it works. Gary's O-ring kit is a god send to people wanting to rebuild their Disco pumps. In fact I wouldnt mind starting a pump rebuild side business hehe.

John

The 850 Resource

the pump pictures i had in a comp. crash. where i found a problem in the pump i took apart was the o ring on the check valve, on the high pressure end. others have found other weak points. if you dissamble the top of the pump from the base, and clean out the base, then replace, with a better o ring on the check valve, lube where needed, you will probably extent the useable life of the pump. i bought the o ring set from gary, but havn't got around to puting them in the pump yet. if you really need pictures, i could reinstall the picture loading discs in my comp and take some more pics, as i still have the pump disambled. john

if you need to see them, i did another series of photos on the disco pump. i'm thinking of tracing the air flow thru the different stages and photographing the path ways. another day. i think i took enough to show how it comes apart, so if needed, they are here. oh, and pics only last about a week once posted. john