To maintain the life of a standard pool diverter valve, you should lubricate the square seal at least twice a year. In addition you should remove the valve assembly and lubricate the 3 o-rings inside the valve at least once a year. To avoid valve maintenance you have the option of replacing these standard valves with Jandy Neverlube valves. These valves have teflon surfaces that do not need to be lubricated. This page explains what you need to do to lubricate a standard valve.
Fill the cap 2/3 full with valve lubrication.
As stated above, you should lubricate the Square Seal twice a year through the Grease Port. The internal O-rings should be lubricated once an year and to do this, you will have to disassemble the valve.
Before replacing the Valve Handle onto the Assembly Staft, make sure it is positioned correctly. There are four slots on the shaft. One slot is narrower than the other three. Make sure the narrow tab on the Valve Handle lines up with the narrow slot in the shaft. Picture at right shows slots on the shaft. Next picture shows the tabs on the Valve Handle.
Screw on the Locking Knob. Before you tighten rotate the Valve Handle so that the "OFF" label is positioned away from the "INLET" label on the Valve Cover. If the "OFF" label on Valve Handle is positioned on the "INLET" side, it will be operating on the wrong side of the shut off stops and you will only be able to shut off the inlet port.