Air powered ocillating nozzles are not traveling the whole distance, does anyone know what controls the valve that tells the air cylinder to operate and for how long?
If you are talking about the length of the stroke there is an air cylinder with two thumb screws where the linkage to the oscillators is attached. Two small thumb screws can be adjusted once you loosen the small lock nut. I don't remember which screw does what, but if you watch while adjusting, one adjusts the stroke.
At least, that's how it works on a D & S Quicksilver.
I will try that, it just started acting weird today, it goes all the way to the left but only halfway to the right until the wash stops then it goes all the way to the right where it stays until they start moving again when the wash starts. They work fine manually, but during a wash they only go halfway.
You might also want to examine the area where the linkage is bolted to the shaft from the air cylinder. The hole may have been reamed out from wear or the bolt may be binding it up somehow. I've replaced that bolt several times.