®
Fig. 1
Fig. 2
Nozzle
Retainer/
Range
Adjustment
Screw
Arc Adjustment
Socket
Fig. 3
Lift Up
Socket
Indicates
VStat
®
Self-
Adjusting
Stator
Recess
for Nozzle
ID Button
Specific
Model
36S
43
I40
V
®
I-40
ADS
Fig. 4
Water
flow
Arc Adjustment
Direction
ARC ADJUSTMENTS
All I-40/41 group adjustable heads are preset to
approximately 180°. Sprinklers may be adjusted
with water on or off. It is recommended that
initial adjustment be made before installation.
1. Using the palm of your hand, rotate the
nozzle turret counterclockwise to left stop to
complete any interrupted rotation cycle.
(Fig. 1).
2. Rotate the nozzle turret clockwise to right
stop. This is the fixed side of the arc. The
nozzle turret must be held in this position for
all arc adjustments.
To Increase Arc
1. Insert the key end of the Hunter wrench into
the adjustment socket (Figs. 2 & 3).
2. While holding the nozzle turret at the right
stop, turn the wrench clockwise. Each 360°
turn of the wrench increases the arc 45°.
3. Adjust to any arc between 40° and 360°.
4. Wrench will stop turning, or there will be a
ratcheting noise, when the maximum arc
(360°) is reached.
To Decrease Arc
1. Insert the key end of the Hunter wrench into
the adjustment socket (Figs. 2 & 3).
2. While holding the nozzle turret at the right
stop, turn the wrench counterclockwise.
Each 360° turn of the wrench decreases
the arc 45°.
3. Adjust to any arc between 40° and 360°.
4. Wrench will stop turning, or there will be a
ratcheting noise, when the minimum arc
(40°) is reached.
Radius Adjustment
Insert the hex end of the Hunter wrench into the
nozzle-retainer/range-adjustment screw (Figs. 2
& 3). Turn the screw clockwise into the stream
of water to decrease the radius, or counter-
clockwise to increase the radius.
Precipitation Rate Adjustment
Where excessively wet or dry areas are a
problem, the precipitation rate may be adjusted.
Simply replace the existing nozzle with a larger
one to increase, or a smaller one to decrease
the rate of precipitation.
Nozzle Installation
1. Insert the key end of the Hunter wrench
into the lifting socket of a pop-up sprinkler.
Pull the riser up to gain access to the
nozzle socket.
2. Using the Hunter wrench, loosen the nozzle-
retainer/range-adjustment screw. If a nozzle
is already installed in the sprinkler, it may
now be removed by briefly turning on
the water.
3. Discard nozzle if removed with pliers.
Slip the desired nozzle into the nozzle
socket. Note that the socket is angled up
25° (see Fig. 4). Tighten the nozzle-retainer/
range-adjustment screw.
Institutional Series™
I-40/41/42/43
Gear-Driven Sprinklers
Hunter Industries Incorporated • The Irrigation Innovators
© 2006 Hunter Industries Incorporated
1940 Diamond Street • San Marcos, California 92078
P/N 700144
LIT-144
11/06
www.HunterIndustries.com
