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Shurflo 3.3 GPM no-flow control pump with pump head housing hose fittings, intake line on the left, return line in the center, and output plastic swivel connector on the right. This pump is configured for the Model E-100 walk-behind field marker. http://www.athleticfieldmarker.com/products/walk-behind-striper.html http://www.athleticfieldmarker.com/products/parts/e-100-rs-500-external-bypass-3-3-gpm-pump.html

Phillips head screw driver on a cordless drill to help remove 6 metal screws.

Six metal Phillips head screws are loosen that hold the pump head, valve kit, and diaphragm kit to the pump motor body.

Two sets of three screw, different threads and lengths, holding pump head assembly to motor body.

With all screws around the outside of the pump head assembly loosen. The center three screws that hold the center port adapter to the pump head does not have to be touched.

Side view of pump with screws loosen but not removed.

Now the pump head assembly is being separated (should be easily separated, although paint build-up could act like a glue) from the motor and the diaphragm kit (white looking collar/ring) with valve kit just coming into view.

Another view of the pump head assembly separating. Pump shouldn't have to be removed from the Model E-100 deck frame to perform this operation (nor the hoses that would be connected via hose clamps to pump head barbed connectors.

Pump head assembly removed and looking at the inside of the pump head. Screws are still in place on the pump head housing. Ensure you have rinsed the unit with clean water prior to starting this process!

Viton Valve Kit is shown seated in the Diaphragm Kit with the pump head housing removed. Three small port with slots (top, lower right and left) and large center valve (softer rubber) approximately 2 inches in diameter. http://www.athleticfieldmarker.com/products/parts/pump-valve-kit-3-3-gpm-viton.html

Side view of Diaphragm Kit (approximately 1 inch thick plastic housing) starting to be separated from the pump motor. Valve Kit is still seated on the Diaphgragm Kit.

Two different types of metal screws used to hold pump head housing to pump motor. Both have to be loosen to access the Diaphragm and Valve Kits.

Diaphragm Kit being separated, may need to use a flat head screw driver to help when there is paint build-up.

Being to remove the Valve Kit (Viton) from the Diaphragm Kit. Using a flat head screw driver to help peel back the edge of the Diaphragm Kit.

Valve Kit not being separated from the Diaphragm Kit.

Valve Kit complete removed from the Diaphragm Kit. The three orbital sections of the Diaphragm Kit. The creases in these sections is where a Diaphragm Kit typically fails or the metal casing that slides onto the motor shaft. http://www.athleticfieldmarker.com/products/parts/diaphragm-kit-3-3-gpm-pump-e-100-rs-500.html

Pump motor crank shaft that the Diaphragm Kit slides into (metal casing at the center of the Diaphragm Kit). Alignment tabs on the pump motor ensures the Diaphragm Kit is properly aligns before the pump head is reattached and screws tighten. http://www.athleticfieldmarker.com/products/parts/diaphragm-kit-3-3-gpm-pump-e-100-rs-500.html

Viton Valve Kit center valve with three alignment tabs can be peeled to check for paint build-up and removal with a nylon brush or dull knife blade or flat head screw driver. It is critical that the alignment tabs are reseated into the plastic frame. If the pump dries out then it is possible during the first use of the pump it may cause these alignment tabs to become unseated and preventing the pump from priming.