At Graco, we do our best to answer our customers' product-related questions in an informative and easy to understand manner. In order to allow our customers access to the best and most up to date information, we use a self-service application called the Product Knowledge Exchange hosted on the Graco.com Web site.
At the Product Knowledge Exchange, you can search the questions that other customers have asked. And if you still can't find the answer you're seeking, simply submit a new one.
To get you started, we've listed some of the most frequently asked Magnum-related questions below.
Where can I purchase repair parts for my Magnum airless sprayer?
Answer: You can purchase Magnum repair parts through one of the many service repair centers. Graco does not sell parts direct.
Go to our Where to Service page or dial 1-888-541-9788 to find a servicing distributor near you.
How do I eliminate the tip from spitting paint onto what I am spraying?
Answer: There are two basic reasons that cause spits or droplets of un-atomized paint.
- The first would be damage or wear in the spray tip or gun needle. Replace the tip if it’s worn or damaged. To check the gun, remove the tip & guard assembly. Repeatedly trigger the gun, watching for spits or leakage when the trigger of the gun is released. Any leakage would indicate that there is a problem with the needle/seat in the gun and it would need to be cleaned or rebuilt.
- The second reason is not mechanical damage, but rather a characteristic of airless spray. When a gun is at rest, there is about an inch of paint lying in a channel between the front of the gun and the end of the spray tip. In the micro second when the gun is triggered, the paint in this channel starts to move forward and gets out of the tip before the high pressure paint behind it can raise the pressure to a level where it will atomize. This paint that gets through the tip, is carried to the substrate with the spray and is the spit or glob of paint that you are seeing. The severity of this problem varies with the type of material sprayed, but is a common problem when spraying enamels for fine finish woodwork. The only cure is to trigger the gun as fast as possible, trigger the gun off the substrate, or changing to an air spray application method.
How do I choose the right tip to spray a new material?
Answer: There are two variables that must be selected when picking a spray tip. One is the size of the hole in the tip and the other is the width of the spray pattern. The type of material being sprayed will determine the required hole size in thousands of an inch. Use smaller orifice sizes for lower viscosity materials such as stains and lacquers. Larger orifice sizes are best for heavier coatings like latexes or oil-based paints. The easiest way to determine the best hole size is to ask the material manufacturer, because they have tested their product and know what size works best. If this is not possible check out Graco’s brochure on tips for some general guidelines. Pattern width depends on what object is being sprayed. The wider the surface of the item being sprayed the wider the tip that should be chosen.
How do I spray paint using an airless sprayer?
Answer: See our How to use a paint sprayer pages. We also have an excellent Guide to Airless Spraying (1.5MB PDF) that gives a complete overview of airless equipment, spraying techniques and safety issues.
Why doesn't my Magnum paint sprayer prime?
Answer: Listed below are the possible sprayer settings or conditions that could cause the sprayer not to prime. They are listed in order of the easiest to correct or the most likely to occur to those requiring more complicated corrections to make or unlikely to happen.
- The Spray/Prime valve should be set at PRIME. The arrow on the handle should be pointing down.
- Is the inlet screen or suction tube clogged? Clean debris off inlet screen and make sure the suction tube is at the bottom of the paint pail so the filter is covered with paint. Make sure the protective plastic cap or bag that covers the filter screen on new sprayers has been removed and that the siphon hose is not kinked.
- Is the inlet valve check ball stuck? Place the smaller diameter drain hose into a waste pail and tap the side of the inlet check valve with a tool while the sprayer is stroking. The inlet check valve is the large hex shaped fitting that the larger diameter suction hose is connected to. If this does not free up the ball, remove the inlet tube and place a pencil, eraser end first, into the inlet valve housing to loosen the ball.
- Is the outlet valve check ball stuck? Remove the paint hose from the DX sprayer and unscrew the fitting that the paint hose was attached to. This fitting is the outlet valve. Gently nudge the ball inside the valve assembly with a screwdriver to loosen the ball. Screw the outlet valve back into the pump.
- Make sure the drain line is not blocked so the sprayer can prime. Power Flush your sprayer with water if you are spraying latex paint and you should pass about one gallon of water per minute with the garden hose pressure. Check the diffuser, drain hose, or pump housing to clear any dried paint if the water flow is less. Power Flushing instructions are in the Quick Guide if you are not familiar with the process. (See Sprayer Operations to find the Quick Guide for your Magnum sprayer.)
- The material may be too thick. This sprayer is not intended to spray roofing materials, block fillers, or materials thicker than a latex paint. Even 100% acrylic latex paints may have to be thinned when using a sprayer smaller than the XR9.
What causes my Magnum sprayer to run continuously and not have enough pressure for a proper spray pattern?
- The inlet or outlet check valve is stuck open. Shut the sprayer off, un-plug the electric cord, and rotate the prime/spray valve handle down to relieve any pressure in the sprayer, and remove the blue paint hose from the sprayer. Unscrew the inlet and outlet check valves. Clean the ball and seat of each valve of all debris and inspect to insure ball is loose and can sit tightly on the seat. Inspect the o-ring around the valve housing for damage and replace if necessary. Screw the valve back into the pump and securely attach the hose.
- Leaky joint or damaged suction hose will allow air into the sprayer. Inspect suction hose for leaks, tighten or replace if necessary.
- Spray/Prime valve is stuck open or leaks. Repair or replace Spray/Prime valve. See your service center.
Service centers for Magnum sprayers can be located using our online service locator.
How often should I tighten the packing nut on my airless sprayer?
Answer: The Magnum XR and DX sprayers do not require packing nut adjustments. If you own a Graco 190ES, it's a good practice to check the packing nut on a weekly basis and slightly tighten it if necessary. Paint visible in the wet cup or on the rod surface is an indication that paint is starting to pass by the throat packing and the packing nut needs to be tightened. Depending on the style put a flat-blade screwdriver or punch on the head of the packing nut and tap it lightly with a hammer. Tighten just enough to stop any paint leakage, DO NOT over-tighten. New or repacked pumps generally need re-tightening after the first several gallons. If the nut has been tightened completely and paint continues to leak past the seals, repack the pump.
Why do I get streaks or bands in my spray pattern?
Answer: Streaks in the spray pattern, especially heavy bands at the outside edge, is an indication of low pressure at the tip. Turn up the pressure control knob until these bands are eliminated. If the sprayer is already at maximum, you may have to use larger diameter hose or shorten the length of the hose to reduce the pressure drop. Also, make sure any paint filters in the system are clean, because there will be a pressure drop across a restricted or plugged screen.
Sprayers are rated for a maximum tip size. Using a tip that is larger than the maximum size or a tip that is worn larger will cause low pressure. The tip should also be the proper size for the type of material being sprayed. After extended use, spray tips will wear out, causing a poor spray pattern. You may have to replace the spray tip with a new one to restore the proper spray pattern.
Is it OK to spray latex, oil, and lacquer based paints through the same sprayer, gun, and hose?
Answer: Graco sprayers can spray all types of latex and oil based materials. However, the sprayer is not designed to spray lacquer. There are a few other considerations that you should be aware of. Be sure that all equipment is of sufficient size and of a high enough pressure rating to work with the material that is being sprayed. Another issue to be aware of is that no matter how well a sprayer is cleaned out, some residue will remain behind. It is not uncommon to have pigmented paints contaminate a clear coating like varnish and lacquer. Switching between water-based and solvent-based materials can also make the insides of the pump gummy and sticky. Ideally, we would recommend two different sprayers, but at the very least, you should use a dedicated hose for lacquer and clear coatings.
My Magnum XR sprayer will not build pressure even after I have cleaned the sprayer's filters and cleaned the inlet check ball? Do you have any further suggestions?
Answer: Usually, when a sprayer does not build up pressure, the outlet check ball is either stuck in the open position or on the seat. Unplug the sprayer and relieve any pressure in the system.
If your sprayer has a small black cover just right of the sprayer's fluid hose connection, remove the black cover and use a 3/4" socket to un-screw the outlet check valve and clean it.
If your sprayer does not have the black cover, you will need to lay the sprayer on its back with the front cover up. Remove the 4 screws that attach the cover, hold the prime spray valve and pressure control knobs down so they remain with the sprayer, and gently lift off the cover. The knobs must remain with the pump on the sprayer. The outlet check valve will be in the middle of the pump housing sitting at an angle. Remove the outlet check valve and clean it and replace all the items.
Still have a question?
You can log into the Graco.com Product Knowledge Exchange for full access to questions and answers regarding Graco airless sprayers. Submit your question using the Customer Care Website or call Customer Service at 1-888-541-9788.