LOCATE O-RINGS - There are three O-rings visible on the Shaft assembly as shown in the picture. A forth O-ring is located inside the Shaft Assembly and to access this O-ring you must partically disassemble the Shaft Assembly. See our guide on" How To Replace the Hayward Slide Valve Internal Shaft O-Ring".
INSPECT O-RINGS - Roll each of the three O-rings from their grooves and inspect them for wear or damage. You may have to start them out of their grooves with a small screwdriver. Replace O-rings as required. Note the sizes of the three O-rings as you replace them. The bottom O-ring (left) is slightly smaller than the middle O-ring and the top (right) is the largest in diameter but is thinner.