How to Adjust Your Rotors
Rotors are the workhorses of larger lawn areas. Unlike fixed spray heads, rotors rotate back and forth across an arc you can adjust. When they drift out of alignment—watering the street, missing a corner, overlapping too much—you can usually fix it yourself in five minutes.
How Rotors Work
A rotor head contains a gear-driven mechanism that turns the nozzle assembly back and forth between two set points: the left stop and the right stop. The arc (how wide it sweeps) and the direction (where it points) are both adjustable. One important rule: never mix rotors and spray heads on the same zone—their precipitation rates are incompatible.
Tools You'll Need
- Flat-head screwdriver (for some models)
- Hunter or Rain Bird rotor adjustment tool (matches your brand)
- A running zone (adjustments are made with water on)
Adjusting the Arc (How Wide It Sweeps)
Step 1: Turn on the zone
Turn on the zone so the rotor is operating.
Step 2: Wait for left stop
Let the rotor travel to its left stop.
Step 3: Locate the adjustment screw
Locate the arc adjustment screw on top (marked with + and −).
Step 4: Insert your adjustment tool
- Turn clockwise (+) to increase the arc
- Turn counterclockwise (−) to decrease the arc
Step 5: Verify
Let the rotor complete a full cycle and verify.
Most rotors adjust from about 40° to 360°. After adjusting the arc, make sure your controller runtime is set long enough for rotors—they need more minutes per cycle than spray heads.
Adjusting the Direction (Where It Points)
Step 1: Wait for left stop
With the zone running, let the rotor travel to its left stop.
Step 2: Grip the turret
Grip the top of the rotor turret firmly.
Step 3: Rotate the turret
Rotate the entire turret left or right to reposition where the arc begins.
Step 4: Verify arc width
The right stop moves automatically—the arc width stays the same.
Common Mistakes
- Adjusting while the rotor is mid-cycle
- Forcing the turret past its stops
- Ignoring the radius adjustment screw
When to Call a Pro
If the rotor won't hold its arc, stutters during rotation, or doesn't rotate at all, the internal mechanism is likely worn or damaged. At that point it's time for a head replacement rather than another adjustment. A pro can also check for underlying pressure or system-level issues that cause premature rotor wear.
Rotor Not Rotating?
We repair and replace all rotor brands quickly. Get expert diagnosis and professional rotor adjustment for optimal coverage.
Related Guides
How to Select the Right Spray Nozzle
Decode nozzle labels and match the right nozzle to your coverage needs.
Never Mix Rotors and Spray Heads
Why mixing head types on one zone guarantees uneven coverage.
Controller Programming Guide
Set runtimes and schedules that work for your rotor zones.
Sprinkler Repair Cost Guide
What to expect when budgeting for head replacements and repairs.