scallop lines

[straightline]

I considered it set itself.  It went right again to doing what it was doing.  Currently, I've modified the push providing, thouroughly cleansed whole program from mountain catcher to tip of weapons.  Changed demand device.  I'm at a reduction here.  Changed shows, thinned shows.

HUH?!?!?!?!?!?

It's just some of that nasty canned meat. If it turns into a troll Don will shoot it.

[johnnymac18]

I considered it set itself.  It went right again to doing what it was doing.  Currently, I've modified the push providing, thouroughly cleansed whole program from mountain catcher to tip of weapons.  Changed demand device.  I'm at a reduction here.  Changed shows, thinned shows.

HUH?!?!?!?!?!?

[albartpeter]

I considered it set itself.  It went right again to doing what it was doing.  Currently, I've modified the push providing, thouroughly cleansed whole program from mountain catcher to tip of weapons.  Changed demand device.  I'm at a reduction here.  Changed shows, thinned shows.

[Grungle]

If you replaced the packing and the ball, did you replace the seat for the ball or turn it over. The seats are double sided for a new ball.  As the ball wears, so does the seat, so either replace the seat as well or have it machined with a new face. 
This has never given me a line as bad as in the picture, but it can be one of the things that adds to the problem.
If you did replace the ball and not the seat, it will eventually reseat but it will take a bit of time.

[}BeJay{]

This happens to all of us at some point or another. It always the same responses.
1. It is not the fact that there may be a 1/4" hose instead of the larger 3/8" hose. Graco made these for many years w the 1/4" hose and they painted fine.  The larger hose was beneficial but never was the cure for hourglassing unless the hose was plugged. If just switching to a larger hose was the cure all, then your saying that all Graco machines they built w a 1/4" hose are supposed to hourglass.
2. The paint you have always used is too thick? I've never seen that as the case. I have used solvent base paint at 10*F and it paints fine and it will be so thick you it will barely pour. Thinning the paint only bypasses the problem you have.
3. When you do some maintenance and end up with a new problem......guess what you have caused it or created it. Sometimes this new problem is because we have done something wrong or disturbed it which made this problem come now to the surface.
Bottom line. It is a pump issue. Re-examine the pump that you just overhauled and all lines leading up to the pump.

Never dismiss anything that Cormac tells you. He is probably the most knowledgeable on any Graco situation.

[straightline]

That looks like the pressure is falling and rebuilding, check for leaks in the intake lines the check the pressure controll system. Could also have a ball check ball.

And the paint could also be too thick.

[skeens]

i already put a new pressure relief valve on.  There is no bypass coming through from there...I thought that might have been the problem.  I'm starting to wonder...is the paint too thick?  I've been using this brand paint for years, never an issue.

[Rcan]

Check your pressure relief valve, could be leaking when the pressure is built up. Build up the pressure and put your ear to diffrent parts of the striper. have the lid off and see if paint is coming out the prime tube when it is just sitting.
 
Thats my kick at the can!!

[skeens]

yes used several different tips, old and new.
Also, noticed that the pressure slowly drops while not in use fluctuates between 25 to 50 pounds while spraying.  Is that normal?  I wouldnt think it is, but the fine folks at our authorized Graco repair shop say it is.

[DAN N.J.]

Did you try switching tip?

[skeens]

I thought it fixed itself.  It went right back to doing what it was doing.  To date, I've changed the pump packing, thouroughly cleaned entire system from rock catcher to tip of guns.  Changed pressure valve.  I'm at a loss here.  Changed paints, thinned paints.  Nothing seems to fix this.  Looking for other ideas.  I'm thinking boat anchor.
 
The pic shows what the line is looking like. 
 
http://www.flickr.com/photos/26572419@N04/6709440067/in/photostream

[wally]

Glad to hear it worked itself out, but almost every time I've had problems with lines hourglassing it's been on the suction side of the  hose.  It may just have worked itself out of the way, waiting to give you fits another day.  If it were me I would go ahead and take the suction hose off and take a gander at the piping going up into the housing.  You may be surprised at the gunk that has built up there.

[Cormac]

If it worked itself out, my guess is that maybe something was caught in the ball/seat or the perhaps one set of the packings (upper or lower packing stacks was adjusted to tightly)was working like a brake. 
When evaluating hourglassing issues, an important diagnostic note is to determine  the frequency of the of the hourglassing.  Every few inches is in the pump (or shorter intervals - vibration related), while every 3 - 5 feet is engine speed, clutch, etc.  the surface condition or marginal paint can "telegraph" hourglassing as well.   

[straightline]

I striped another lot today, it seems to have worked itself out.  Nice sharp lines again.  Strange. 

Could have been the paint too, maybe too thick or something.

[skeens]

I striped another lot today, it seems to have worked itself out.  Nice sharp lines again.  Strange.