Hunter I-60 Series User manual

I
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PRODUCT INFORMATION
I-60 Rotors
A Large Turf Rotor Engineered to Meet
the Demanding Needs of Systems with
Lower Pressures and Smaller Budgets

2
TABLE OF CONTENTS
Product Overview ......................................................................................... 3
Product Features and Benefits ...................................................................... 4
Product Comparisons.................................................................................... 7
Nozzle Replacement Guide .......................................................................... 8
Technical Information................................................................................... 8
Product Performance .................................................................................... 9
Installation Details ...................................................................................... 10
Installation & Arc Adjustment .................................................................... 11
Distribution Analysis
(No. 7-20 nozzles) ...................................................................................... 12
I-60 Replacement Parts............................................................................... 17
Installation Cost Comparisons .................................................................... 18
Precipitation Rate and Run Time Formulas ................................................ 21

3
PRODUCT OVERVIEW
How do you bring the cost of irrigating
large turf areas down to Earth? Install
gear-driven rotors that perform at low
pressures with low precipitation rates
while creating the most highly efficient
water distribution profile. The full-circle
I-60-36S and the 40˚ to 360˚ adjustable arc
I-60-ADS will provide these valuable
benefits through Hunter’s patented
innovative nozzling system—Precision
Distribution Control®. With Precision
Distribution Control®, our single nozzle
design reduces pressure requirements
while creating larger droplets that fight the
wind and maximize radius. For excellent
close-in coverage, gear driven diffuser
pins intermittently distribute the stream.
The result? Reduced system maintenance
and operating costs from large turf rotors
engineered to meet the most demanding
water and energy conservation needs.
Great for low pressure retrofit applications
as well. The I-60 rotor is setting new
standards for the landscape irrigation
industry, as no other 40-65 foot radius
rotor can match its outstanding performance
at lower operating pressures.
An Easy Choice for Installers
Irrigation installers prefer the I-60 rotor for
four simple reasons: it’s easy to install, it’s
easy to adjust, it’s guaranteed reliable and
it’s the best value money can buy.
Installation is easy because of the “through
the top” adjustment mechanism allowing
modifications to be made quickly and
precisely whether the sprinkler is on or
off, while the rubber cover protects the
adjustment sockets from the intrusion of
debris. The industry’s #1 continuously
improved gear-drive system, coupled with
the 3-spring reversing technology, guarantees
reliable operation and optimum performance.
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I-60-36S
Full Circle
I-60-ADS
Adjustable Arc
There’s no better value on the market than
the Hunter I-60 and, with its patented
Precision Distribution Control®features
and Hunter’s years of experience in
gear-drive technology, it’s no wonder the
I-60 rotor has established itself as the
professional’s choice.

4
PRODUCT FEATURES
AND BENEFITS
Patented Precision Distribution
Control®…
Assures even coverage at low pressures
The rotor’s single nozzle design features
Precision Distribution Control®for reduced
turbulence and maximum radius. With
gear driven pins that intermittently diffuse
the stream, Precision Distribution Control®
creates water-efficient performance while
it minimizes runoff and waste.
Operates with Lower Working Pressure...
The most power efficient rotor in the
industry
Because of its unique nozzle design based
on mechanical diffusion, only the I-60 can
make the claim that it operates efficiently
at low pressures. Large radius rotors
(50-65') (15-19.8 m) designed for large
turf or landscaped areas require a base
pressure in the range of 60-90 psi
(3.5-6.2 bars) to reach radius’ in the 60
foot (18.2 meter) range. At 40 psi (2.8 bar)
the I-60 is able to reach 62' (18.9 m)
making it the clear winner for systems
without the luxury of higher pressures or
for retrofits into systems that have had a
reduction in operating pressure over time.
I-60 ADS
®
Flow
Direction
Arrow
Lift Up
Socket to
Service
Riser
Arc Adjustment
Socket
Six Interchangeable Nozzles…
Truly uniform coverage and fast
identification
With every sprinkler in the I-60 group you
get six free interchangeable nozzles that
accurately go the distance. The nozzles
range from 50-66 feet (15.2-20.1 m) and
from 6.5-20.4 gpm (1.48 - 4.63 m3/hr)
(24.6 - 77.2 l/min.). Each nozzle is
color-coded and numbered for quick and
easy identification. The nozzle number
indicates the approximate flow rate for the
nozzle at 60 psi. The I-60 comes with the
#18 nozzle as the standard factory installed
nozzle, but can be ordered with any
pre-inserted nozzle for convenience and
timesaving installation.
Dual Flange I-60-36S Nozzles
Single Flange I-60-ADS Nozzles
Integral Rubber Cover with Membrane
Covered Sockets…
Keeps dirt out, permanently installed
The I-60 combines a small 13/4" (10 cm)
diameter exposed surface area with a soft
rubber cover to make the rotor ideal for
play areas. Because
the cover is securely
attached, it will
always give the
adjustment sockets
the protection of a
flexible membrane
to keep dirt out.

5
Heavy Duty Spring…
Positive retraction in the harshest conditions
Any turf area is unsafe
when sprinklers stay up
long after they’ve quit
running. Not only can
someone trip over a
sprinkler and injure him
or herself or break the
head that fails to retract,
but also rotors like this
can become easy targets
for vandalism. Because
of the extra beefy
stainless steel spring,
the I-60 rotors retract
every time, all the time.
Easy Arc Adjustment…
For fastest, hassle-free adjustment, wet or
dry, up or down
Because of its reversing full circle and
part-circle operation in one unit, the I-60
Adjustable Arc Rotor (I-60-ADS) is an
“all-in-one” sprinkler. With its 40˚ to 360˚
Adjustable Arc, most odd shaped areas can
be irrigated with a quick turn of the Hunter
wrench. The I-60 can be adjusted up or
down, wet or dry, for maximum convenience.
The 8:1 adjustment ratio changes the arc
45˚ for each full turn of the wrench and
the arrows on the rubber cover clearly
define the adjustment direction with plus
(+) and minus (-) symbols. Only one rotor
is needed to cover those curving walkways
and odd-angled turf areas.
Anti-Drain Check Valve…
Saves water, reduces liability
The built-in anti-drain check valve is
standard on I-60 rotors. The check valve is
designed to keep back a maximum of 10'
(3 m) of water pressure. Preventing low
head drainage eliminates washouts and
wasted water, and may also prevent
accidents from occurring and pests from
showing up. Also, due to water staying in
the pipes, installers may benefit from the
reduction of potential surge damage.
Heavy-duty Water Lubricated Gear
Drive…
Enduring reliability, year after year
First introduced about 20 years ago and
still being continuously improved, the
water lubricated gear drive system in the
I-60 is patterned after one of Hunter’s
famous heavy-duty golf rotors, ensuring
you with reliability and time proven
optimum performance.

6
Patented V-Stat Self-adjusting Stator…
Drives more power and adds years to
sprinkler life
The I-60 requires no specially installed
parts or adjustments to ensure constant
speed of rotation. With the self-adjusting
VStat™, the I-60 is provided up to twice the
driving force to the gear drive while adding
years to the sprinkler’s life. This is
accomplished through the stator’s patented
turbine isolation technology, a breakthrough
that all but eliminates gearbox wear due to
upward and lateral water thrust.
Standard Stainless Steel Riser…
Reliable retraction; longer riser seal life
The I-60's standard stainless steel riser
protects the riser and riser seal from
scratches and wear due to the increased
durability of stainless steel in harsh and
sandy soil conditions. Stainless steel
eliminates possible scoring on the riser and
riser seal, which can lead to premature
leaking and unsafe riser “stick-ups.”
PRODUCT FEATURES
AND BENEFITS (CONT.)
3-Spring Reversing Mechanism…
Reliability when it’s needed
Installers and end-users will have no
worries with the most reliable adjustable
arc reversing mechanism in the industry.
Our patented 3-spring, reversing technology
won’t hang up and get locked at the
critical directional shift point.
5 Year Warranty…
Hunter Industries backs up the products
A full five-year warranty by Hunter
communicates to our customers that
the I-60 is a rotor that stands up to the
environment. The end-user can be
assured of a quality product with a
guarantee of dependable operation.
Date Coding…
The easy way to identify exactly when your
rotor was manufactured
All the Institutional Series Rotors including
the I-60 have the manufactured date code
stamped on the bottom of the riser stem.
The I-60’s heavy-duty filter must be
removed first to read the code (a flat-blade
screwdriver works well for this). The date
is stamped with a 4-digit code – the first
two digits representing the month, the last
two digits indicating the year (e.g., 05 00
stands for May 2000).

7
FEA
TURES
A
Radius ad
j
ustment availabl
e
✓
✓
✓
✓
✓
Radius adjustment without disassembly of part
s
Precision Distribution
C
ontro
l
®
50'-62' Radius at 40
p
s
i
✓
✓
✓
✓
Ex
p
osed diameter - Less than 2 inche
s
✓
Com
p
act design Overall height - Less than 8 1/2 inche
s
✓
Vandal resistant,
p
ermanent rubber cove
r
✓
✓
✓
Nozzles installed without removing
p
art
s
✓
✓
✓
✓
✓
Heavy-duty & coarse buttress thread
s
✓
✓
✓
✓
✓
✓
✓
“
Jar to
p
”
convenience with no loose
p
arts to break or s
p
ecial tools require
d
✓
✓
✓
✓
✓
✓
Patented and
p
roven reliable 3 s
p
ring reversing mechanis
m
✓
Arc adjustment accom
p
lished without removing
p
art
s
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Adjustable Arc Range
(
40
˚
-360
˚
)
✓
✓
✓
✓
✓
✓
Up, down, wet or dry adjustmen
t
✓
✓
✓
✓
Quick check arc settin
g
✓
✓
✓
✓
Check valve check height
(
up to 10'
)
Pull-up socket for easy se
r
vicin
g
✓
Easy to read arc adjustment symbols on top of sprinkle
r
✓
✓
✓
✓
Dir
ec
ti
o
n
a
l fl
o
w in
d
i
ca
t
or
, model variation I.D. on to
p
of s
p
rinkle
r
✓
S
tainless steel riser as standar
d
✓
O
p
tional reclaimed water version
s
✓
✓
✓
✓
✓
✓
✓
✓
✓
W
ater lubricated
g
ear driv
e
✓
✓
✓
✓
✓
✓
✓
✓
H
U
NTE
R
I-
60
T
OR
O
®
2
001
RAIN BIRD
®
F
a
l
c
o
n
NEL
SON
®
7
000
NEL
SON
®
7
500
RAIN BIRD
®
T
alon
T
T
OR
®
6
4
0
N
/
A
N
/
A
N
/
A
N
/
A
PRODUCT
COMPARISONS
Toro
®
is a registered trademark of the Toro Company
Rain Bird
®
is a registered trademark of Rain Bird Sprinkler Manufacturing Corp.
Nelson
®
is a registered trademark of L.R. Nelson Corporation

8
Rotor
To Replace: Rainbird Falcon Use I-60 Nozzle
6 ( Lt. Blue )➟7 ( Orange )
8 (
Dk. Green )➟10 ( Green )
10 (
Gray )➟13 ( Lt. Blue )
12 (
Beige )➟15 ( Gray )
14 (
Lt. Green )➟15 ( Gray )
16 (
Dk. Brown )➟18 ( Red )
18 (
Dk. Blue )➟20 ( Dk. Brown )
To Replace: Rainbird Talon Use I-60 Nozzle
12 ( Red )➟10 ( Green )
14 (
White )➟15 ( Gray )
16 (
Blue )➟20 ( Dk. Brown )
To Replace: Rainbird R-70 Use I-60 Nozzle
9 ( Orange )➟10 ( Green )
12 (
Beige )➟15 ( Gray )
15 (
White )➟20 ( Dk. Brown )
18 (
Blue )➟20 ( Dk. Brown )
To Replace: Rainbird "Other" Use I-60 Nozzle
41-51A 14x11 ➟20 ( Dk. Brown )
47A 16 ➟18 (
Red )
37A 14 ➟10 (
Green )
6060 13x11 ➟18 (
Red )
5055 14 ➟10 (
Green )
65 Series 16 ➟18 (
Red )
To Replace: Thompson 186/187 Use I-60 Nozzle
P-Nozzle ➟7 ( Orange )
Q-Nozzle ➟10 (
Green )
R-Nozzle ➟15 (
Gray )
S-Nozzle ➟18 (
Red )
T- Nozzle ➟20 (
Dk. Brown )
To Replace: Nelson 7000 & 7500 Use I-60 Nozzle
1➟7 ( Orange )
2➟10 (
Green )
3➟13 (
Lt. Blue )
4➟15 (
Gray )
5➟18 (
Red )
6➟20 (
Dk. Brown )
To Replace: Toro 2001 Use I-60 Nozzle
6 ( Yellow )➟10 ( Green )
9 (
Red )➟13 ( Lt. Blue )
(
Brown )➟15 ( Gray )
18 (
Black )➟18 ( Red )
24 (
Blue )➟20 ( Dk. Brown )
To Replace: Toro 640 Use I-60 Nozzle
40 ➟10 ( Green )
41 ➟13 (
Lt. Blue )
42 ➟15 (
Gray )
43 ➟18 (
Red )
44 ➟20 (
Dk. Brown )
To Replace: Toro 610 Use I-60 Nozzle
6➟10 ( Green )
9➟13 (
Lt. Blue )
12 ➟15 (
Gray )
15 ➟18 (
Red )
To Replace: All Mfg. Single Nozzle Impacts Use I-60 Nozzle
3
/ 16 "➟7( Orange )
13
/ 64 "➟10 ( Green )
7
/ 32 "➟10 ( Green )
15
/ 64 ➟13 ( Lt. Blue )
1
/ 4 "➟18 ( Red )
17
/ 64 "➟20 ( Dk. Brown )
12
MODELS
I-60-ADS – Adjustable arc (40°–360°)
I-60-36S – Full circle
DIMENSIONS
•Pop-up height: 3" (8 cm)
•Overall height: 8
3
/ 8 " (21 cm)
•Female inlet: 1" NPT or BSP
•Exposed diameter: 1
3
/ 4 " (10 cm)
OPERATING SPECIFICATIONS
I-60-ADS • Discharge rate: 6.5 to 20.4 gpm
(1.48 to 4.63 m3/hr; 24.6 to 77.2 l/min)
•Radius: 50' to 66' (15.2 to 20.1 m)
•Pressure range: 40 to 60 psi
(2.8 to 4.1 bars; 275 to 413 kPa)
•Precipitation rates*: approximately .29"
to .52" (7 mm to 13 mm) per hour
•Nozzle trajectory: 25°
I-60-36S • Discharge rate: 6.5 to 20.8 gpm
(1.48 to 4.72 m3/hr; 24.6 to 78.7 l/min)
•Radius: 51' to 67' (15.5 to 20.4 m)
•Pressure range: 40 to 60 psi
(2.8 to 4.1 bars; 275 to 413 kPa)
•Precipitation rates*: approximately .25" to .55"
(6 mm to 14 mm) per hour
•Nozzle trajectory: 25°
OPTIONS AVAILABLE
•Reclaimed water cover
•Factory-installed nozzles
* Calculated for 360 ° sprinkler
PRODUCT EXPLANATION
EXAMPLE: I-60 - ADS - 18
OPTIONS
XX = Complete Set of Nozzles
7-20 = Factory-Installed Nozzle Number
B = BSP Thread
MODEL
I-60 = 3" Pop-up
FEATURES
ADS, 36S
ARS, 3RS
NOZZLE REPLACEMENT GUIDE
TECHNICAL INFORMATION

9
PRODUCT PERFORMANCE
I-60-ADS Part Circle Performance Chart – Metric I-60-ADS Part Circle Performance Chart
Pressure, flow rate and radius data for this product were
determined and listed in accordance with ASAE Standard S3981.
Data represent test results in zero wind. Adjust for local conditions.
*Standard nozzle installed.
10
Lt. Green
13
Lt. Blue
15
Gray
20
Dk. Brown
18
Red*
7
Orange
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
6.5
7.1
7.7
8.5
9.5
10.2
10.5
12.1
13.0
12.5
13.9
15.1
15.6
17.5
18.6
17.5
19.1
20.4
10
Lt. Green
13
Lt. Blue
15
Gray
20
Dk. Brown
18
Red*
24.6
26.9
29.1
32.2
36.0
38.6
39.7
45.8
49.2
47.3
52.6
57.2
59.1
66.2
70.4
66.2
72.3
77.2
15.2
15.9
16.5
16.2
17.1
17.7
17.1
17.7
18.3
17.7
18.3
18.9
18.0
18.9
19.8
18.9
19.5
20.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
275
344
413
275
344
413
275
344
413
275
344
413
275
344
413
275
344
413
1.48
1.61
1.75
1.93
2.16
2.32
2.39
2.75
2.95
2.84
3.16
3.43
3.54
3.98
4.23
3.98
4.34
4.63
7
Orange
Radius
ft.
PSI GPM
Radius
kPaBars
Pressure
m
3
/hr. l/min
Flow
Color Coded
Nozzles m
Color Coded
Nozzles
50'
52'
54'
53'
56'
58'
56'
58'
60'
58'
60'
62'
59'
62'
65'
62'
64'
66'
I-60-36S Full Circle Performance Chart – Metric
10
Lt. Green
13
Lt. Blue
15
Gray
20
Dk. Brown
18
Red*
7
Orange
Radius
ft.
PSI GPM
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
10
Lt. Green
13
Lt. Blue
15
Gray
20
Dk. Brown
18
Red*
15.5
16.5
17.1
16.2
17.1
17.7
17.1
17.7
18.3
17.7
18.3
18.9
18.0
18.9
19.8
18.9
19.5
20.4
Radius
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
2.8
3.4
4.1
275
344
413
275
344
413
275
344
413
275
344
413
275
344
413
275
344
413
kPaBars
Pressure
m
3
/hr. l/min
Flow
Color Coded
Nozzles
1.48
1.70
1.82
1.93
2.16
2.32
2.39
2.82
2.95
2.84
3.18
3.43
3.54
4.02
4.29
3.98
4.34
4.72
7
Orange
m
Color Coded
Nozzles
51'
54'
56'
53'
56'
58'
56'
58'
60'
58'
60'
62'
59'
62'
65'
62'
64'
67'
6.5
7.5
8.0
8.5
9.5
10.2
10.5
12.4
13.0
12.5
14.0
15.1
15.6
17.7
18.9
17.5
19.1
20.8
24.6
28.4
30.3
32.2
36.0
38.6
39.7
46.9
49.2
47.3
53.0
57.2
59.1
67.0
71.5
66.2
72.3
78.7
I-60-36S Full Circle Performance Chart
To measure pressure at the nozzle of a I-60 or any rotor sprinkler, order
Hunter rotor pressure gauge kit part # 122900.

10
I-60 GEAR DRIVE
I-60SWING.
®
RUBBER COVER
GEARED ROTOR
FINISH GRADE
1" STREET ELL
(LENGTH AS REQUIRED)
PVC LATERAL LINE
PVC TEE
1" STREET ELLS
MODEL I-60
1" SCH 80 NIPPLE
Installation Detail
Installation Height
The I-60 sprinkler should be installed at
finish grade as shown in the illustration.
INSTALLATION DETAILS

11
INSTALLATION & ARC ADJUSTMENT
Fig. 3
Fig. 2
NOZZLE INSTALLATION
Tools needed: T-handle tool p/n 319100, riser service tool p/n 279100, Hunter wrench or 3/32" Allen.
Preparation
Unscrew the body cap from the body of the sprinkler. Remove the body cap. Using the key end of the Hunter wrench,
pull up on the riser assembly to remove it from the body.
Remove the filter screen. Place the riser assembly’s lower end into the base of riser service tool p/n 279100. Press the
tool’s metal bar down over the riser spring. Continue compressing the spring until the bar enters the slots in the tool’s
base. Rotate the bar to engage with the tool’s base, thereby holding the spring under tension.
Nozzle Removal and Replacement
I-60-36S: The nozzle is retained in the nozzle housing by a setscrew. To remove the nozzle, back out the setscrew so
that the nozzle will clear. Rotate the nozzle housing to place the diffuser yoke at its lowest position in order to provide
clearance. Grasp a nozzle tab with pliers and pull to remove.
I-60-ADS: The nozzle is retained in the nozzle housing by a setscrew. To remove the nozzle, first slide the diffuser pins
to the extreme left, from the viewer’s perspective, past the black stop post.
All Models: Place the replacement nozzle in the housing. Press firmly to fully seat
the nozzle so that it will clear the retaining setscrew. This can be accomplished with
the T-handle tool’s open end. Run the setscrew down to retain the nozzle, taking
care not to run it down so far as to interfere with the nozzle stream. For I-60-ADS
models, ensure the diffuser pins are placed back in line with the nozzle.
Visually check for proper assembly of nozzles and setscrews. Reverse the
preparation procedure to reassemble the unit.
Arc Adjustment
All I-60-ADS adjustable arc sprinklers are preset at 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 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 all arc adjustments.
To increase arc:
1. Insert the key end of the Hunter wrench into the adjustment socket (Fig. 1
and Fig. 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°–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 (Fig. 1
and Fig. 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°–360°.
4. Wrench will stop turning, or there will be a ratcheting noise, when the minimum
arc (40°) is reached.
Diffuser Yoke
Filter Screen
Nozzle
Retainer Screw
I-60-36S Riser Assembly
Diffuser Pins
Nozzle
Retainer Screw
Pin Recess for
Nozzle Removal
Filter Screen
I-60-ADS Riser Assembly
I-60 ADS
®
Flow
Direction
Arrow
Lift Up
Socket to
Service
Riser
Arc Adjustment
Socket Fig. 1

12
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
D.U.%
Sched. Coefficient
0.10
0.20
0.30
0.40
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70
Row 35 43 52 61 feet
SC = & DU = for Equilateral Spacing
.48 .38
.30
.25
.20 .17
.15
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.13
0.26
0.39
0.52
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70
Row 35 43 52 61 feet
SC = & DU = for Equilateral Spacing
.54 .43
.35
.28
.23
.20
.17
Model: I-60-36S
Nozzle: 7 (orange)
Flow: 7.64 GPM
Pressure: 50 PSI
SOR: 2:39 min.
Radius: 53 feet
DISTRIBUTION ANALYSIS
Hunter's Testing Philosophy
The following five sets of distribution analysis for the new I-60 are from Hunter's state-of-the-art testing lab.
Hunter Industries routinely submits products to The Center for Irrigation Technology for independent testing.
We use CIT's test results to verify our own and to make our performance available to the public through their
computer software programs. All nozzles for the new I-60 are tested by CIT. The examples below coincide
with the five nozzles that are shipped with each sprinkler at 40 & 50 psi respectively.
I-60 Nozzle #7
Data Interpretation
The upper portion of each report shows the water distribution profile for the sprinkler along with flow, pressure, speed of rotation and radius
information. The lower portion is dedicated to efficiency and precipitation rate analysis. To read the graph, first note the spacing range at the
bottom. These are the reference points when looking for efficiency at a specific spacing. The lower solid bar that has the numbers above it is the
Scheduling Coefficient (SC) line. The numbers above this line reference the precipitation rate in inches per hour at each spacing. To find the SC at
your spacing, reference the vertical numbers on the left. SCs of less that 2 are considered good and less than 1.5 are considered excellent. The
dashed line along the top is the Distribution Uniformity (DU) line. The DU rating is expressed as a percentage which serves as an indicator
of the uniform of water application to a given area of sprinklers, spaced in a triangular pattern.
Model: I-60-36S
Nozzle: 7 (orange)
Flow: 6.75 GPM
Pressure: 40 PSI
SOR: 2:41 min.
Radius: 49 feet

13
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.07
0.14
0.22
0.29
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70
Row 35 43 52 61 feet
SC = & DU = for Equilateral Spacing
.63 .50 .41
.33
.27
.23 .20
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.09
0.18
0.27
0.36
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70
Row 35 43 52 61 feet
SC = & DU = for Equilateral Spacing
.71 .56 .46 .38 .31
.26 .20 .17
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.14
0.28
0.42
0.56
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80
Row 35 43 52 61 69 feet
SC = & DU = for Equilateral Spacing
.77
.62 .50 .41
.34 .29
.25
.22
.19
Model: I-60-36S
Nozzle: 10 (green)
Flow: 8.96 GPM
Pressure: 40 PSI
SOR: 2:37 min.
Radius: 55 feet
Model: I-60-36S
Nozzle: 10 (green)
Flow: 10.16 GPM
Pressure: 50 PSI
SOR: 2:36 min.
Radius: 59 feet
Model: I-60-36S
Nozzle: 13 (blue)
Flow: 11.12 GPM
Pressure: 40 PSI
SOR: 2:37 min.
Radius: 55 feet
I-60 Nozzle #10,13

14
Model: I-60-36S
Nozzle: 13 (blue)
Flow: 12.69 GPM
Pressure: 50 PSI
SOR: 2:35 min.
Radius: 59 feet
Model: I-60-36S
Nozzle: 15 (gray)
Flow: 13.37 GPM
Pressure: 40 PSI
SOR: 2:34 min.
Radius: 55 feet
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.15
0.30
0.45
0.60
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80
Row 35 43 52 61 69 feet
SC = & DU = for Equilateral Spacing
.93 .74 .60
.49
.41 .35 .30 .26
.23
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.16
0.32
0.48
0.64
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80
Row 35 43 52 61 69 feet
SC = & DU = for Equilateral Spacing
1.06 .84 .68 .56 .47
.40 .34
.30
.26
Model: I-60-36S
Nozzle: 15 (gray)
Flow: 15.28 GPM
Pressure: 50 PSI
SOR: 2:34 min.
Radius: 61 feet
DISTRIBUTION ANALYSIS
I-60 Nozzle # 13, 15
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.14
0.28
0.42
0.56
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80
Row 35 43 52 61 69 feet
SC = & DU = for Equilateral Spacing
.88 .70 .57 .47 .39
.33
.28
.25
.22

15
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.18
0.36
0.54
0.72
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80
Row 35 43 52 61 69 feet
SC = & DU = for Equilateral Spacing
1.05 .84 .68 .56 .47
.39 .34
.30
.26
0.18
0.36
0.54
0.72
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80 90
Row 35 43 52 61 69 78
SC = & DU = for Equilateral Spacing
1.19 .94 .76 .63 .53 .45
.38
D.U.%
.33
.29
Equilateral Spacing (in feet)
Sched. Coefficient
.24
.26
Model: I-60-36S
Nozzle: 18 (red)
Flow: 15.16 GPM
Pressure: 40 PSI
SOR: 2:10 min.
Radius: 59 feet
Model: I-60-36S
Nozzle: 18 (red)
Flow: 17.13 GPM
Pressure: 50 PSI
SOR: 2:34 min.
Radius: 63 feet
I-60 Nozzle # 18

16
Model: I-60-36S
Nozzle: 20 (brown)
Flow: 16.43 GPM
Pressure: 40 PSI
SOR: 2:32 min.
Radius: 57 feet
Model: I-60-36S
Nozzle: 20 (brown)
Flow: 19.05 GPM
Pressure: 50 PSI
SOR: 2:31 min.
Radius: 61 feet
0.18
0.36
0.54
0.72
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 40 50 60 70 80 90
Row 35 43 52 61 69 78
SC = & DU = for Equilateral Spacing
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
1.15 .91 .74 .60
.50
.42 .36
.32
.25
.22
.28
D.U.%
Equilateral Spacing (in feet)
Sched. Coefficient
0.15
0.30
0.45
0.60
Precipitation
Rate In/Hr
Distance From Head (in feet)
1.0
1.5
2.0
2.5
3.0
60
80
100
90
70
Head 50 60 70 80
Row 43 52 61 69 feet
SC = & DU = for Equilateral Spacing
.85 .70 .59
.50
.42 .37
.32
DISTRIBUTION ANALYSIS
I-60 Nozzle # 20

17
1
2 3
5
4
6
7
1
3
4
5
2
6
7
Item Description Part No.
Body Cap Assembly 431700
Rubber Cover Screw (2 Required) 334000
Rubber Cover Assembly ADS (Black) 420300
36S (Black) 420400
ARS (Purple) 420305
3RS (Purple) 420405
Riser Assembly ADS 432020
Includes Riser, Retractor Spring, 36S 431820
Spring Seat, Seal, Filter Screen and ARS 432120
Rubber Cover 3RS 431920
Filter Screen Assembly
(with Check Valve) 422200
Body NPT 420600
BSP 420605
Nozzle Package ADS 462373
Includes 7, 10, 13, 15, 18, 20 36S 462374
I-60: GEAR-DRIVEN SPRINKLERS
REPLACEMENT PARTS

18
IRRIGATION SPECIFICATIONS:
Conclusion:
In this example, the clear winner is the
system retrofitted with I-60 rotors. Not
only is the I-60 less expensive to install
and maintain the first year, but it does not
have any overhead costs attached to it in
subsequent years. To install the I-60 rotors
into the existing system, the initial costs
are approximately $2,638, after which
there are no more costs. The pump
installation option costs are approximately
$3,664 for the first year (separated as
$2,787 for initial installation and $877 for
yearly recurring costs). In the first year
alone, the pump option will cost $1,026
more than just installing the I-60 rotors.
Also, the yearly costs of a booster pump in
the system after the first year will be
approximately $877.
INSTALLATION COST
COMPARISONS
HOW THE I-60 STACKS UP
AGAINST OTHER ROTORS
To demonstrate the cost savings that the
I-60 rotor can provide, we offer two
different examples where low water
pressure plays a key role in the decision
making process. In the first example, an
existing community park has seen its
water pressure steadily drop over the years
as surrounding development has increased.
In the second example, a city is trying to
determine which size rotor makes the most
sense to install in a new park.
With Precision Distribution Control
®
, a superior watering
profile is maintained, even at low pressures.
Option 1: Booster Pump
ESTIMATED COST OF PUMP INSTALLATION $ 2,787
YEARLY ELECTRICAL ENERGY COST $ 337
YEARLY PUMP MAINTENANCE LABOR OVERHEAD COST $ 540
Initial Installation Cost
and 1st Year Operating Costs $ 3,664
EXAMPLE 1
RETROFIT INSTALLATION:
Existing 2.5 Acre City Park
Five years after the original system
installation at the site, the zone pressure
drops to 40 psi dynamic, due to a
substantial increase in surrounding
housing density. The entire irrigation
system at the park is currently
under-performing due to the lower
operating pressure.
The city is considering one of the
following options as a solution:
1. Booster pump to increase pressure
at the park
2. Hunter I-60 Rotor as a replacement for
existing rotors
(Cost comparison utilizes prices quoted to a specific city,
actual costs may vary by region.)
Original system operating zone pressure 70 psi
New system operating zone pressure 40 psi
Original rotor spacing 62'
Original nozzle size 20 gpm
Total rotors in park 30
100 gpm zones 6
Option 2: I-60 Rotors
ESTIMATED COST OF ROTOR INSTALLATION $2,638
YEARLY ELECTRICAL ENERGY COST $
0
YEARLY ROTOR MAINTENANCE LABOR OVERHEAD COST $ 0
Initial Installation Cost
and 1st Year Operating Costs $2,638

19
EXAMPLE 2
NEW DESIGN & INSTALLATION:
New 10-Acre City Park, Specified 100%
Hunter Product
A city has decided to specify the installation
of 100% Hunter product in a new park.
The park has 76 psi available static water
pressure and two 2" water meters under
which the system must be designed. Now,
the only question is what type of rotor
makes the most sense to install. Under
consideration are the I-25 and I-60 rotors.
The I-25 rotors must be spaced closer
together requiring more heads per acre
and, while choosing the I-60 not only
means fewer heads covering a greater
distance, but also heads that can deliver
water more efficiently at the site’s low
operating pressure.
HUNTER PRODUCT LIST PRICE:
SPECS. Option 1: I-60 Rotors Option 2: I-25 Rotors
AVAILABLE STATIC
PRESSURE 76 psi 76 psi
DYNAMIC PRESSURE -
36 psi -36 psi
LOSSES
OPERATING ROTOR 40 psi 40 psi
PRESSURE
NOZZLE 12.5 gpm 6.6 gpm
SPACING 58' Equilateral Triangular 44' Equilateral Triangular
ROTORS PER ACRE 16 26
TOTAL ROTORS 160 260
ZONES 20 18
PIPE BETWEEN HEADS 9,280' 11,440'
Conclusion:
The cost of Hunter irrigation products
needed for this 10-acre park is
approximately the same, whether
the I-25 or the I-60 option is installed.
The difference is only slight, with the I-60
system coming in just $161 less. Where
the real money is saved is in the piping
material and the labor to install the
complete system. A very rough
comparison estimate ratio that is intended
to show the amount of material needed for
the two systems indicates that the I-25
system will use at least 23% more pipe
and fittings than the I-60 system. This
ratio is directly linked to material costs.
The biggest cost savings show up in the
installation costs, with the number of
rotors needed (and, therefore, the
accompanying cost of labor) being over
62% higher installing the I-25 system as
opposed to the I-60 system.
Option 1: I-60 Rotor System
20 ICV-210G 2" Valve $ 2,540
160 I-60 Rotors $ 14,392
1 ICC-8M+16 Controller $ 685
TOTAL COST $17,617
Option 2: I-25 Rotor System
18 ICV-201G 2" Valve $ 2,286
260 I-25 Rotors $14,807
1 ICC-8M+16 Controller $ 685
TOTAL COST $17,778

20
OVERALL CONCLUSION: I-60 IS THE ONE
As both of these examples demonstrate, the I-60 rotor not only delivers high performance, but it does so in an
economical manner that other rotors are hard pressed to match. Whether you are dealing with a retrofit appli-
cation or an entirely new installation of an irrigation system, if you have a landscape that encompasses a large
expanse of turf and you are dealing with low operating pressures, no rotor offers a better solution than the new
Hunter I-60.
CALCULATIONS
EXAMPLE 1 - RETROFIT/OPTION 1
ESTIMATED WHOLESALE COST OF PUMP INSTALLATION:
5 hp Booster Pump: $ 920
Pump Enclosure: $ 400
Pump Start Relay: $ 45
Flow Switch: $ 80
Concrete: $ 100
Pipe/Fittings: $ 80
Electrical Service/Hookup: $ 375
Installation Labor (18 hours): $ 787
TOTAL COST: $2,787
YEARLY ELECTRICAL ENERGY COST:
Energy use on 5 hp pump (at 69% eff.) 6.723 kW/hour
Electricity cost from Utility Co. $ 0.10 kWh.
6.723 kWh x 501.6 operating hrs 3,372.3 kWh
3,372.3 kWh x $ 0.10 kWh $ 337
TOTAL COST: $ 337
PUMP RUN TIME CALCULATIONS
Rotor Precipitation Rate = .53 in/hr.
ET avg. = .27 in/day6 zones x 3.5 hrs/week @ 4 weeks 84.0 hours
ET avg. = .20 in/day6 zones x 2.6 hrs/week @ 4 weeks 62.4 hours
ET avg. = .15 in/day6 zones x 2.0 hrs/week @ 8 weeks 96.0 hours
ET avg. = .12 in/day6 zones x 1.6 hrs/week @ 16 weeks 153.6 hours
ET avg. = .08 in/day6 zones x 1.1 hrs/week @ 12 weeks 105.6 hours
YEARLY PUMP OPERATING TIME 501.6 hours
CALCULATIONS
EXAMPLE 2 - NEW DESIGN
APPROXIMATE SYSTEM PRESSURE LOSS COMPUTATIONS:
2" Meter (100 gpm max.) 8 psi max. loss
3" CL 200 Service Main-90' length, 1 psi loss
2" Reduced Pressure Backflow 13 psi loss
3" CL 200 Main-500’ length 4 psi (0.8 psi/100') loss
2" ICV Valve (100 gpm) 4 psi loss
PVC Laterals 3 psi loss
PVC Fittings/Misc. 3 psi loss
TOTAL LOSSES: 36 psi loss.
PIPE BETWEEN HEADS:
For I-60 system: 58’ pipe between each head x 160 rotors = 9,280 feet of pipe.
For I-25 system: 44’ pipe between each head x 260 rotors = 11,440 feet of pipe.
CALCULATIONS
EXAMPLE 1 - RETROFIT/OPTION 2
ESTIMATED WHOLESALE COST OF ROTOR INSTALLATION:
30, I-60 Rotors: $1,888
Labor Cost ($25 per rotor): $ 750
TOTAL COST: $2,638
MATERIAL COST RATIO ESTIMATE:
The I-25 system will require 23.2% more material.
Compare the amount of pipe used for the I-25 system vs. the I-60 system (11,440’/9,280’ = 1.232).
LABOR COST RATIO ESTIMATE:
The I-25 system will require 62.5% more installation labor hours.
Compare the number of rotors needed for the I-25 system vs. the I-60 system (260/160 = 1.625).