i have a 2005 olin 565 that seems to be short  strokin and its got me stumped. any ideas or help would be great

Its not short stroking your problem is the mud is bridging at the first balls take a pressure washer nozzle stick it down at the one that not pulling mud you can watch your hopper and see witch one is not pulling just  hit it with water and it will start with certian concrete or grout mine does it also, mine is a 5/45 it used to worry me but now I know what to do. Things I did with no help was change out one of the forward check valves, also switch it to manual stroke one side and hold it for a second or two then the other side, also I changed out the balls and seats they get worn and don't seat correct, very easy to do.

I had a water rod made for mine.  3/8" x 36" with a ball valve and water hose connection, just like Ed's saying.  Great for flushing out the manifold at clean up also.  Olin pumps are cheap pumps to operate but require a good mud to pump.  They do not like garbage.

Peagravel was this any help to your problem, 79 and I booth own OLINS, if you buy Balls and seats be sure to buy from Olin and get hardned parts they last longer,right 79.

Yep, some will get by and some will last.  Heat treated is good, OEM.

were do you guys get your parts from???

Olin has everything you need, be sure to change your oil in the wet box at least once a month and clean out your surge chamber and replace the hdy oil once a month mine take's one quart, it say's two quarts but I found that one is enough, 79 and I use only 2 1/2 inch hose nothing smaller or bigger.

heres the thing though it does it at the yard with no mud in the hopper just water

I do not know the answer but something is telling it to stroke.  Loose wire, bad connection, relay getting hot. When it does that can you manually stroke properly ?

yes strokes perfectly fine manually its weird as soon as you start it and turn it on it does it

Here is something else make sure your alternator is putting 14 volts at the battery ,then make sure the connections are tight on your curcuit board, what 79 is saying about a loose wire could be right.

With water you have to turn the flow control cause water doesn't compress.

so i have an update on my prob ed and 79 and it makes me feel stupid.  month befor all this was happening i was pumping a job 60 yards and i was half way through and one of my prox switchs went out so i changed it and when i did in the heat of the moment i put the washbox cover on backwards . still had the prob so i pumpedthe other 30 yards out manually got home parked the pump and pulled out the ol ta 650 hp so as the pump sat for a month i completely forgot about switchn the prox out. so yesterday i go to olin in hunington beach and good ol orville comes out shakes his head  starts laughn turns the plate around manually strokes it a few times and im good to go and can park the o so gutless ta . i know you guys r prob laughn ur butts off