Toro Sprinkler System Repair

Updated February 21, 2017

Toro manufactures landscaping equipment and irrigation products for residential and commercial use. Toro sprinklers, including pop-up and gear-driven models, provide water to keep lawns and gardens healthy. Maintaining your Toro sprinkler system includes making necessary repairs. Clogged sprinkler filters, misaligned heads, poor watering radius, poor watering arc and damaged sprinkler heads can all negatively affect your sprinkler system's efficiency and affect your lawn or garden. Underground supply lines that are damaged should be addressed immediately to avoid water waste and decreased sprinkler performance.

Turn sprinklers so they are facing the desired watering area. Turn on the sprinkler system. Grab the body or housing of misaligned heads and turn them as needed.

Clean the sprinkler filter. Dirt and other debris may clog the filter screen located inside your Toro sprinkler. This can reduce water flow. Hold the sprinkler body with one hand and unscrew the cap with the other. Remove the cap, nozzle and assembly from the sprinkler body. Remove the screen and flush it with water. Flush the nozzle, assembly and body with water also. Reinstall the screen, cap, nozzle and assembly. Turn the sprinkler on to test its operation.

Adjust sprinkler radii. To adjust the watering radius or distance of a Toro sprinkler, use a screwdriver or hex driver to turn the adjustment screw located on top of the sprinkler and above the sprayer. Turning the screw clockwise will decrease the spray radius. Turning it counterclockwise will increase it.

Adjust the arc of sprinklers. This step applies to Toro gear-driven sprinklers that rotate when in use. Adjust sprinkler arc by pushing down on the nozzle and turning it to the left or counterclockwise. Release the nozzle after you have finished making the adjustment.

Replace sprinkler nozzles. If a sprinkler nozzle has been damaged or is not performing properly after completing the above steps, it may need to be replaced. For fixed-spray nozzles like the Toro 570 series, pull up on the riser and unscrew the nozzle by turning counterclockwise. Remove the existing filter. Insert the new filter and tighten the new nozzle by threading it clockwise.

Toro gear-driven sprinklers like the Super 600 use a set screw. Push down on the cap to expose the set screw. Loosen the set screw and unscrew the nozzle. Screw on the new nozzle and tighten the set screw. Slowly release the cap.

Replace the entire sprinkler. Severe damage to a sprinkler may require complete replacement. Use a shovel to dig a hole around the sprinkler head and the underground riser pipe. Hold the riser with one hand and unscrew the existing sprinkler with the other by grabbing the body and turning it counterclockwise. Install the new sprinkler by threading it onto the riser in a clockwise direction until tight. Fill in the hole around the sprinkler and tamp the earth down with your foot.

Repair broken underground supply lines. Use a shovel to dig the earth up around the broken line. If the break is small, you may be able to cut the section out with PVC cutters and install a fitting. For large sections of pipe that are damaged, you will need to replace the entire length of pipe. Measure the amount of the break with a tape measure. Use a PVC cutter to cut a new section of PVC pipe to match. Cut the damaged pipe out. Apply PVC primer to the ends of the underground pipe and the new pipe you cut. Also apply primer to the insides of two couplings, which will join the pipes together. After allowing the primer to dry, apply PVC cement to the ends of the underground pipe and to one side of each coupling. Twist the cemented end of the couplings onto the underground pipe. Apply PVC cement to the other end of the couplings and the new pipe. Insert the pipe into the couplings by twisting one end inside one coupling and slightly flexing the pipe to insert the other end. Allow to dry and then turn on the system to test for leaks. Fill the ground in and tamp it down with your foot.


Some Toro sprinklers may be sold with an adjustment key for changing the sprinkler's radius and arc. For Toro arc adjustments, you may need to find the fixed left edge or stop. This is the left edge of the sprinkler beyond which the nozzle will not move. Push down on the nozzle and turn it to the left. If the nozzle is difficult to turn, turn it to the right and then the left. When the sprinkler ceases to turn left, you have found the fixed left edge. Align the left edge with the desired start/stop point by grabbing the sprinkler body and turning it. The right edge or stop can be adjusted using Step 4. Some Toro sprinklers like the Super 600 have an arc adjustment button located on the sprinkler's stem. While the sprinkler is operating, push the button in and turn the nozzle clockwise to increase the arc. Turn the nozzle counterclockwise to decrease it.


Turning the radius-adjustment screw too far may cause it to come out. Do not force the sprinkler nozzle to turn. Always turn it in the direction of least resistance or force, or if it is on turn it in the direction of movement.

Things You'll Need

  • Shovel
  • Philip's-head screwdriver
  • Flathead screwdriver
  • Hex driver
  • PVC primer
  • PVC cement
  • PVC fitting
  • Measuring tape
  • PVC pipe
  • PVC cutters
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About the Author

Based in Florida, Jim Franklin started writing professionally in 2009. His articles appear on websites such as eHow, where he covers topics ranging from home improvement to finance. Franklin has a Bachelor of Arts in business management from Florida Atlantic University.