Sprinkler Systems Adjustments

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Rotating Head Adjustment Instructions


Hunter Sprinkler Head Adjustments | Rain Bird R-50 Adjustments | Rain Bird 5000 Adjustment | Walla Walla / Hunter Mp Rotator Adjustments


How to adjust Hunter pgp gear drive rotor


How to adjust mp rotator stream rotor


SprinklerHunter PGP® - Sprinkler Head Arc Adjustments

Adjustable heads are preset to approximately 180°. Sprinklers may be adjusted with water on or off. It is recommended that initial adjustments be made before installation.

Using the palm of your hand, rotate the nozzle turret counterclockwise to the left stop to complete any interrupted rotation cycle.

Rotate the nozzle turret clockwise to the right stop. This is the fixed side of the arc. The nozzle turret must be held in this position for arc adjustments. The right stop does not change.

sprinkler diagram
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sprinkler diagram - fig 3

Hunter PGP® - How to Increase the Arc

Insert the plastic key end of the Hunter wrench into the adjustment socket.

While holding the nozzle turret at the right stop, turn the wrench clockwise. Each full 360° turn of the wrench will increase the arc 90°.

Adjust to any arc between 40° and 360°.

The wrench will stop turning, or there will be a ratcheting noise, when the maximum arc of 360° (full circle) has been reached.

Hunter PGP® - How to Decrease the Arc

Insert the plastic key end of the Hunter wrench into the adjustment socket.

While holding the nozzle turret at the right stop, turn the wrench counterclockwise. Each full 360° turn of the wrench will decrease the arc 90°.

Adjust to any arc between 40° and 360°.

The wrench will stop turning, or there will be a ratcheting noise, when the minimum arc of 40° has been reached.

fig 4

Hunter PGP® - Adjusting Radius and Distance of Throw

Insert the steel hex end of the Hunter wrench into the radius adjustment screw.

Turn the screw clockwise (into the stream of water) to decrease the radius, or counterclockwise to increase the radius. Radius can be reduced up to 25%.

Caution: Turning the adjustment screw clockwise more than five full turns may result in a lost radius adjustment screw.

fig 6

Hunter PGP® - Precipitation Rate Adjustment

If you have excessively wet or dry areas, you can change the nozzle in the sprinkler to increase or decrease the precipitation rate. For dry areas, install a larger nozzle. For wet areas, install a smaller nozzle.

Hunter PGP® - Nozzle Installation

Insert the plastic key end of the Hunter wrench into the lifting socket of the sprinkler and turn 90°. Pull the riser up to gain access to the nozzle socket.

Using the steel hex key of the Hunter wrench, turn the radius adjustment screw counterclockwise to be sure it is not blocking the nozzle socket opening. If a nozzle is already installed, it can be removed by backing out the adjustment screw and turning on the water, or by pulling outward on the nozzle “ears” with a pair of needle-nosed pliers.

Slip the desired nozzle into the nozzle socket. Note that the socket is angled up 25°. The “ears” should be adjusted so that the nozzle range screw threads directly down between them. Then tighten the nozzle range screw. The raised bump with an arrow on the rubber cover will always indicate the location of the nozzle and direction of water flow when the sprinkler is retracted.

Hunter PGP® - Aligning the Right (Fixed) Side of Arc

If the right side of the arc is not properly aligned, the results may be a wet walkway or a dry turf area. The right side arc can easily be realigned. One way to realign the right stop is to turn the whole sprinkler body assembly and the fitting below it, left or right to the desired position. This may require temporary removal of the soil around the sprinkler to allow you to grip the sprinkler housing. Another way to reset the right arc is to unscrew the body cap counterclockwise and remove the internal assembly from the body. Once removed, rotate the nozzle turret to the right stop, screw the internal assembly back into the body with the nozzle aligned to the right side of the area you want irrigated (Fig. 9). At this point you have realigned the right arc stop, and you can adjust the left arc to an appropriate setting.

Note: It is not necessary to dig up and remove the whole sprinkler to realign the right arc.

Note: The G Type rotary sprinklers adjust the same way a PGP does. See the PGP Installation and Adjustment Instructions above.

SOURCE: HUNTER IRRIGATION


Rain Bird SpinklerRain Bird R-50 Adjustments

The R-50 is an internal impact sprinkler. This means that there are two small stainless steel balls that act as the drive mechanism.

Rain Bird R-50 Arc Adjustment

To increase the arc - Keep in mind that the sprinkler is preset to approximately 180°. Pull up on the stem; slide the vandal collar out of its groove. Push down on the nozzle slightly, and rotate the nozzle to the right (clockwise). The arc will be increased by the amount the nozzle is turned. For example, if the arc was previously set for 180°, and it was turned 90° while the nozzle was pushed down, the sprinkler will now have an arc of 270°. Be sure to replace the vandal collar when finished.

To decrease the arc - Pull up on the stem; slide the vandal collar out of its groove. Push down on the nozzle slightly, and rotate the nozzle to the left (counter-clockwise). The arc will now be decreased by the amount it is turned. Be sure to replace the vandal collar when finished.

To change the arc to a full circle - Remove the internal assembly from its case.

Slide the vandal collar out of its groove, and rotate the nozzle to the right (clockwise) until a strong resistance is felt. It will feel as though it is locked in place. Return the vandal collar to its groove. Rotate the nozzle to the right (clockwise), there should be no resistance felt in the 360° turn.


Rainbird 5000 Instructions
English Installation Instructions
Installing and Removing Nozzles:

1. Insert tool into pull-up slot, turn 90 degrees, and lift up stem. (A)

sprinkler adjustment Rainbird 5000

2. Insert the desired nozzle into the nozzle socket, and turn the radius
adjustment screw clockwise to secure the nozzle in place. (B)

sprinkler adjustment Rainbird 5000

3. Insert the selected nozzle’s identification plug into the opening on
the top of the rotor.

4. To remove the nozzle, back out the radius adjustment screw,
place the blade of the screwdriver under the nozzle removal tab
and press the handle down. (C)

sprinkler adjustment Rainbird 5000

Setting the Arc:
The arc is adjustable from 40-360 degrees (PC units only). The rotor
is factory set to 180 degrees.

Align Fixed LEFT Edge:
1. Pull up turret and turn to the left trip point (counterclockwise).
CAUTION: If the rotor does not turn easily to the left, first turn it
right (clockwise) to the right trip point.

2. Rotate entire case to the desired fixed left position, OR unscrew
cap and pull out assembly. Rotate internals to re-align left trip
point to the desired point and re-install.
To increase or decrease the arc: (D)

sprinkler adjustment Rainbird 5000

1. While holding the nozzle turret at the fixed LEFT stop, insert tool
or screwdriver into the adjustment socket.

2a. Turn the screwdriver clockwise, (+) to INCREASE arc.

2b. Turn the screwdriver counterclockwise, (-) to DECREASE arc.

3. Each full clockwise turn of the screwdriver will add or remove 90
degrees of arc.

4. When the maximum arc of 360 degrees or minimum arc of 40
degrees has been set, you will hear a ratcheting noise. Do not
adjust the rotor beyond the maximum or minimum arc.
Radius Adjustment: (Radius can be reduced up to 25%) (E)

sprinkler adjustment Rainbird 5000

1. Insert screwdriver into the radius adjustment socket.

2. Turn the screwdriver clockwise to reduce radius, and
counterclockwise to increase radius.
(5000 PLUS ONLY) Turning Flow On or Off (F)

sprinkler adjustment Rainbird 5000

1. Insert screwdriver into Flow Shut-off Slot.

2. Turn screwdriver clockwise 180 degrees to stop the flow of water.

3. Turn screwdriver counterclockwise 180 degrees to start the flow
of water.


Walla Walla / Hunter Mp Rotator Adjustments

Use the MP Rotator Adjustment Tool for faster, easier adjustments. 

sprinkler photo

· Install the MP Rotator with the Left Edge Indicator pointing to left side of the desired watering area.

· With the water on and the MP Rotator in the pop-up position, rotate Arc Adjustment Ring clockwise to increase the arc, counter-clockwise to decrease the arc.

· Use the built in ratchet feature to fine tune edge alignment by simply overriding the left or right resistance points in either direction.

The radius can be adjusted down up to 25% by turning the small screw on the top of the nozzle with the mp rotator adjustment tool or a tiny flat blade screw driver. The radius will not decrease over 25%.

SOURCE: Hunter Industries


The above are adjustment instructions on the most common style of sprinklers. Additional adjustment resources are available at these links.

Hunter
Rain Bird
Toro
Irritrol
Weathermatic
Orbit Irrigation

Sprinkler Systems


American Irrigation Repair
Rating: 5.0 out of 5 based on 11 reviews.

Brad Reeves

5 Star Rating - 5 stars
American Irrigation Repair

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O'Connell

5 Star Rating - 5 stars
American Irrigation Repair

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Connie Schade

5 Star Rating - 5 stars
American Irrigation Repair

American Irrigation did an audit of our irrigation system and repaired non- functioning heads and divided up one of our zones. They did a great job and came to do the service at the time they promised. We will use them yearly to audit our system and make any repairs necessary. I would highly recommend American Irrigation for any service to your irrigation system."


Pilgrim Management Company

5 Star Rating - 5 stars
American Irrigation Repair

American Irrigation Repair delivers prompt, reliable and knowledgeable service for any repairs. We have used them many times and will continue to do so.


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