clockwise. Each full 360˚ turn of the wrench will decrease the arc 90˚.
3. Adjust to any arc between 40˚ and 360˚ (Fig. 5).
4. The wrench will stop turning, or there will be a ratcheting noise, when the
minimum arc of 40˚ has been reached.
Increase Arc
note: It is not necessary to disassemble the sprinkler to make adjustments.
RaDIUs / DIstanCE oF tHRoW
Insert the steel hex end of the Hunter wrench into the
radius adjustment screw (Fig. 6). 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
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 Industries Incorporated • the Irrigation Innovators
www.HunterIndustries.com
Professional series™
Decrease Arc
Plastic Key End
Steel Hex End
noZZlE InstallatIon
1. 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 (Fig. 8).
2. Using the hex key of the
Hunter wrench, turn the radius
adjustment screw (Fig. 6)
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.
3. Slip the desired nozzle into the
nozzle socket (Fig. 7). 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.
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
note: It is not necessary to dig up and remove the
whole sprinkler to realign the right arc.
Gear-Driven Sprinklers
© 2007 Hunter Industries Incorporated
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