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As I have only just seen your question, maybe you have fixed the problem? If not, this GMax sprayer has an electric clutch to control when it is pumping or not, so there could be 2 sources of the problem: The first is that when the clutch is closed, some part is touching something inside the housing. The other possibility is that one of the bearings has gone dry or a gear has a damaged tooth.
If its not fixed, the drive assembly needs to be opened up and the parts cheked
May be clogged. Push out roll pin with a pin punch and remove assembly.Check plastic pices for broken parts ( black). Put pump in water make sure it's delivering material with valve out. Ports on valve are not that big and do clog.
In all the paint sprayers I've worked on, I've only been able to repair a couple prime valves and they went totally bad a short time after that. They can be taken apart and cleaned up but in the long run you'll be much further ahead replacing it if it isn't holding pressure in your system.
Go to Graco's website at www.graco.com/us/en.html. Under the customer Care tab you can look for Instruction Manuals. Search on your model number and you'll get a list of files that refer to your model. Usually the manual and/or parts breakdown are in the first two or three files.
Airless won't prime- I always start trouble shooting an Airless that won't build/hold pressure look at sump hose inlet filter (the hose that goes into the paint if its got paint debris on it clean off filter and pour the paint thru a strainer bag into a clean 5 gal bucket-also remove the filter housing on the spayer and clean and flush and replace filter and housing- the shaft or the metal sleave has two ball bearings called "check balls" that maybe stuck turn on sprayer and put a piece of wood on shaft and give it a few good taps this will knock the check balls loose if after all this fails then you need to have new packings put in becuase the old ones are worn this is pretty easy to see because the rod the compresses the paint will have signs of paint on it indicating that the packings are worn.. Note keep rod and other moving parts oiled ith graco throat seal and finally Graco sprayers with the X on them are there (Graco) home owner line of sprayers that sell at home depot they are rated for only a certain amount of Gal per year keep it in good condition and cleaned store with coro-check inside of the pump when you are done using it.....