Piston & Diaphragm Assembly: Assembly
Insure that valve seat is smooth and clean. Install new check valve and spring. Insert new expansion plug retainer and tap in until it bottoms.
NOTE:
Check for proper seating of valve by blowing through small end of piston. No air should pass through.
Install new corprene washer, old plate, and second plate.
NOTE:
Position plates so lips face outboard from diaphragm.
Press diaphragm retainer into position (see Fig 1). Install new "O" rings on piston (make sure they are not twisted) and seals on piston (using 0.020" shim stock to aid installation).