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Follow this guide to disassemble and rebuild a leaky or clogged pump for the Graco Paint Sprayer, model 17C325.
Note: The pump’s rebuild kit comes with four black leather packing O-rings. Soak them in a cup of SAE 30 motor oil for an hour before installing them in the pump.
As you disassemble the pump, take the time to clean all the parts with soap, water, and a brush before reassembly, and replace any worn-out parts as needed, which are provided in the pump repair kit (part # 18B260).
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Use your fingers to unscrew the jam nut securing the suction tube to the bottom of the pump.
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Pull the suction tube straight down to disconnect it from the bottom of the pump.
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Use an adjustable wrench to loosen the intake valve on the pump.
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Use your fingers to unscrew and loosen the connector securing the hose to the pump.
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Once unscrewed, push the connector back to reveal the hose connection.
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Use your fingers to unscrew and loosen the jam nut securing the pump to the paint sprayer.
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Lift up the pump rod cover to reveal the pump's connection to the paint sprayer.
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Pull the pump straight out of the drive housing.
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Pull the rear pump hose straight off of the pump.
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Remove the pump from the paint sprayer.
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Unscrew and remove the intake valve from the pump cylinder.
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Use a pick tool to remove the metal ball seat from the bottom of the intake valve.
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Tip the intake valve upside down to remove the inlet ball.
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Use a pick tool to remove the ball seat washer from the bottom of the intake valve.
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Use a pick tool to remove the thin white O-ring at the bottom of the intake valve.
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Turn the intake valve upside down and use a pick tool to remove the white gasket.
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Place the pump cylinder into a vise.
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Use a flathead screwdriver and mallet to unscrew and loosen the top jam nut.
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Continue unscrewing the top jam nut with your fingers to remove it.
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Use a pick tool to remove the black O-ring from the top jam nut.
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With the pump cylinder still in the vise, use a mallet to gently tap down on the top of the piston rod to loosen it from the pump cylinder.
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Remove the pump cylinder from the vise and pull the bottom of the piston rod completely out of the pump cylinder to remove it.
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Use a pick tool to remove the black O-ring from the bottom of the pump cylinder.
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Use your fingers to grab and remove the white plastic gland from the top of the pump cylinder.
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Flip the pump cylinder upside down and use a flathead screwdriver and mallet to gently tap the throat packing O-rings, loosening them from the cylinder.
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Lift up the pump cylinder to remove the throat packing O-rings.
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Use a 3/4" wrench to remove the piston valve bolt from the piston rod.
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Remove the piston valve bolt from the piston rod.
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Remove the wiper bushing from the piston valve bolt.
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Use your fingers to remove the piston packing O-rings from the bottom of the piston rod.
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Tip the bottom of the piston rod over to remove the piston ball.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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