Hunter Industries Incorporated • The Irrigation Innovators
© 2010 Hunter Industries Incorporated
www.hunterindustries.com
P/N 700595 LIT-472 B 1/10
Institutional Series
™
I-20
Gear-Driven Sprinklers
ARC ADJUSTMENT
The I-20 pop-up sprinkler should be
installed at finished grade as shown in the
illustration (Fig. 1).
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.
1. Using the palm of your hand, rotate the
nozzle turret counterclockwise to the left stop
to complete any interrupted rotation cycle
(Fig. 2).
2. 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.
To Increase the Arc:
1. Insert the plastic key end of the Hunter
wrench into the adjustment socket
(Fig. 3 & 4).
2. 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°.
3. Adjust to any arc between 50° and 360°
(Fig. 5).
4. The wrench will stop turning, or there will be a ratcheting noise, when the
maximum arc of 360° (full-circle) has been reached.
5. When set to 360°, the sprinkler will rotate continually counter-clockwise.
To Decrease the Arc:
1. Insert the plastic key end of the Hunter wrench into the adjustment socket
(Fig. 3 & 4).
2. While holding the nozzle turret at the right stop, turn the wrench counter-
clockwise. Each full 360° turn of the wrench will decrease the arc 90°.
3. Adjust to any arc between 50° and 360° (Fig. 5).
4. The wrench will stop turning, or there will be a ratcheting noise, when the
minimum arc of 50° has been reached.
Fig. 1
Fig. 2
Fig. 3
Fig. 5
Fig. 6
Fig. 4
A
R
C
ADS
O
F
F
I-20
Lifting
Socket
Nozzle
Locator/Radius
Adjustment
Screw
Model
Identification
Minimum
Arc
Plastic Key End
Steel Hex End
50
°
360
°
Maximum
Arc
Arc
Adjustment
FloStop
®
Decrease Arc
Increase Arc
Fig. 1
Fig. 2
Fig. 3
Fig. 5
Fig. 6
Fig. 4
A
R
C
ADS
O
F
F
I-20
Lifting
Socket
Nozzle
Locator/Radius
Adjustment
Screw
Model
Identification
Minimum
Arc
Plastic Key End
Steel Hex End
50
°
360
°
Maximum
Arc
Arc
Adjustment
FloStop
®
Decrease Arc
Increase Arc
Note:
It is not necessary to disassemble the sprinkler to make adjustments.
Fig. 1
Fig. 2
Fig. 3
Fig. 5
Fig. 6
Fig. 4
A
R
C
ADS
O
F
F
I-20
Lifting
Socket
Nozzle
Locator/Radius
Adjustment
Screw
Model
Identification
Minimum
Arc
Plastic Key End
Steel Hex End
50
°
360
°
Maximum
Arc
Arc
Adjustment
FloStop
®
Decrease Arc
Increase Arc
Fig. 1
Fig. 2
Fig. 3
Fig. 5
Fig. 6
Fig. 4
A
R
C
ADS
O
F
F
I-20
Lifting
Socket
Nozzle
Locator/Radius
Adjustment
Screw
Model
Identification
Minimum
Arc
Plastic Key End
Steel Hex End
50
°
360
°
Maximum
Arc
Arc
Adjustment
FloStop
®
Decrease Arc
Increase Arc
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%.
Fig. 1
Fig. 2
Fig. 3
Fig. 5
Fig. 6
Fig. 4
A
R
C
ADS
O
F
F
I-20
Lifting
Socket
Nozzle
Locator/Radius
Adjustment
Screw
Model
Identification
Minimum
Arc
Plastic Key End
Steel Hex End
50
°
360
°
Maximum
Arc
Arc
Adjustment
FloStop
®
Decrease Arc
Increase Arc
RADIUS / DISTANCE OF THROW
Caution: Turning the adjustment
screw clockwise more than five
full turns may result in a lost radius
adjustment screw.
REClAIMED ID
All Hunter rotors are available with
a purple rubber cover permanently
attached. The purple cover shows
that reclaimed water is being used
for the project, which promotes safety on the job site.
SHRUb STAkINg kIT p/N 463551
The kit is designed for PGP-00 and I-20-00. It allows you
to safely attach a shrub sprinkler to a piece of
5
⁄
16
"
rebar.
The kit comes with a heavy-duty locking tie to attach the
sprinkler to the kit.
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 removal post 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°. Then tighten
the nozzle range screw. The triangle
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 setting.
Note:
It is not necessary to dig up and remove the whole
sprinkler to realign the right arc.
TURNINg FlOW ON OR OFF
Insert the plastic key end of the Hunter
wrench into the FloStop
®
adjustment
socket (Fig. 3 & 10). Turn wrench
clockwise to decrease or shut off the
flow. Turn the wrench
counterclockwise to
increase the flow.
Fig. 8
Fig. 10
Fig. 9
Fig. 7
Nozzle Removal
Post
Fig. 8
Fig. 10
Fig. 9
Fig. 7
Nozzle Removal
Post
Fig. 8
Fig. 10
Fig. 9
Fig. 7
Nozzle Removal
Post
Model
Nozzle
No.
Pressure
in PSI
Degrees of
Trajectory
Max Height
of Spray (ft.)
Distance from head (ft.)
to Maximum Height
I-20
1.5
45
25
8'
23'
Blue
2.0
45
25
8'
23'
2.5
45
25
9'
26'
3.0
45
25
10'
28'
4.0
45
25
11'
30'
5.0
45
25
11'
30'
6.0
55
25
12'
32'
8.0
55
25
13'
32'
I-20
Low Angle
2.0
50
13
5'
22'
2.5
50
13
4'
22'
3.5
50
13
4'
22'
4.5
50
13
4'
22'
I-20
18' Short
Radius
.50
50
15
5'
8'
1.0
50
14
6'
9'
2.0
50
3
1'
6'
I-20
25' Short
Radius
.75
50
22
7'
13'
1.5
50
18
7'
13'
3.0
50
8
1'
6'
Plastic Key End
Steel Hex End
NON-STRIppAblE bACkDRIvE
This I-20 sprinkler is designed with an internal device that prevents damage to
the internal gear drive if it should be turned by vandals. This important feature
works when the nozzle turret is turning in either direction. This makes the
sprinkler very durable in all applications.
AUTO ARC RETURN
This I-20 sprinkler is designed with an
internal device that re-aligns the arc if it is
turned by vandals. This important feature
works when the nozzle turret is turning in
either direction. When forced outside of the
originally set arc, the sprinkler takes the
shortest path back to the pattern without
going completely around. This saves
the non-irrigated areas from getting wet!
Always a good thing!
a
uto
-retu
rn
if fo
rced
d
esire
d se
t a
rc
Fig. 1
Fig. 2
Fig. 3
Fig. 5
Fig. 6
Fig. 4
A
R
C
ADS
O
F
F
I-20
Lifting
Socket
Nozzle
Locator/Radius
Adjustment
Screw
Model
Identification
Minimum
Arc
Plastic Key End
Steel Hex End
50
°
360
°
Maximum
Arc
Arc
Adjustment
FloStop
®
Decrease Arc
Increase Arc
Fig. 8
Fig. 10
Fig. 9
Fig. 7
Nozzle Removal
Post
