Tools Required: Phillip's head screwdriver, flathead screwdriver.
STEP 1: Check for leaks from the gun assembly.
STEP 2: Check for leaks from the hose and pump.
  • Unscrew the cover plate and remove. With water in the sprayer, start spraying and look for leaks.
  • If the sprayer is leaking where the hose connects to the pump, tighten the hose clamp.
  • If you notice a leaking from the pump diaphragm, replace the diaphragm/pump.
STEP 3: Make changes to the adjustment screw.
  • Stand the sprayer upright and fill the sprayer with a bit of water. Turn it on.
  • Locate the microswitch housing (shaped like a "P") at the bottom of the pump.
  • Use a phillip's head screwdriver to tighten or loosen the adjustment screw (located between the two screws holding the microswitch housing in place) up to one full turn.
  • Activate the sprayer's trigger to test the response. Keep making adjustments until the trigger performs appropriately.
STEP 4: Check the pressure dial.
  • If you have a variable-pressure unit, try turning the power dial. If it rotates continuously, the dial will have to be replaced.