Hunter Institutional Series Manuale utente

LIT-364 7/24/02 3:46 PM Page 1

C M Y CM MY CY CMY K

I-90 Riser Assembly

I-90 ADV & 36V NOZZLE INSTALLATION:

Caution! The riser assembly is under spring

tension. Eye protection should be worn and proper

procedures followed when servicing this product.

Tools needed:

Phillips screwdriver, riser service tool

P/N 279600, needle-nose pliers.

Preparation

Unscrew the body cap from the body, then withdraw

the riser from the body. Place the riser assembly’s

lower end into the base of riser service tool P/N

279600. Press the tool’s metal bar down over the

riser 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

Remove the logo cap, which is retained by a central

Phillips screw. The nozzle is retained in the nozzle

housing by a setscrew. To remove the nozzle, back

out the setscrew using the hex key on the Hunter

wrench so that the nozzle will clear. Grasp the nozzle

with pliers and pull to remove.

Insert the replacement nozzle in the housing. Press

firmly to fully seat the nozzle so that it will clear the

retaining setscrew. Using the hex key on the Hunter

wrench, turn the setscrew down to retain the nozzle.

Note: When changing from one nozzle number

to another, check the stator for proper setting

before returning the head to service.

STATOR RING INSTALLATION:

Note: When installing nozzles you must also

correctly set the stator to ensure proper

speed of rotation. Failure to correctly set the

stator may cause a non-rotation condition.

The stator is located in the base of the riser

assembly. First remove the riser assembly from

the body. Then remove the filter screen to access

the stator.

The stator has a protruding tab that aligns with a

pointer. Remove the stator by grasping this tab

with pliers and pulling. Replace the stator so that

its pointer is set to the number agreeing with the

nozzle installed. Refer to the Nozzle / Stator Chart

below for nozzle and stator settings.

Visually check for proper assembly of nozzles,

setscrews and stator. Reverse the preparation

procedure to reassemble the unit.

1940 Diamond St. • San Marcos, CA 92069 • U.S.A. • www.HunterIndustries.com P/N 700945 LIT-364 8/02

Nozzle / Stator Chart

Nozzle Number Stator Position

Retainer Cap

Opening for Nozzle

Riser Assembly

Stator Ring

Filter Screen

Institutional Series

I-90

Gear-Driven Sprinklers

LIT-364 7/24/02 3:46 PM Page 2

C M Y CM MY CY CMY K

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.

I-90 ADV Only - Arc Adjustment:

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.

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 Arc:

Insert the plastic key end of the Hunter wrench into the

adjustment socket (Fig. 1 & 2).

2. While holding the nozzle turret at the right stop, turn the

wrench clockwise. Each full 360°turn of the wrench increases

the arc 45°.

3. 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.

To Decrease Arc:

1. Insert the key end of the Hunter wrench into the adjustment

socket (Figs. 1 & 2).

2. While holding the nozzle turret at the right stop, turn the

wrench counterclockwise. Each full 360°turn of the wrench

will decrease the arc 45°.

3. 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.

Note: It is not necessary to disassemble the sprinkler to

make adjustments.

I-90 ADV Only - Aligning the Right (Fixed) Side of the 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 can

easily be realigned. One way to realign the right stop 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, insert the internal assembly back into the body

with the nozzle aligned to the right side of the area you want

irrigated. At this point you realigned the right arc stop, and you

can adjust the left arc to an appropriate setting.

Institutional Series

I-90

Gear-Driven Sprinklers

Fig. 2

Fig. 1

Non-

Potable

Water

Arc Adjustment

Socket

Specific

Model

Lift Up

Socket

I-90 ADV

Arc Adjustment

Direction

* Denotes factory-installed nozzle.

** Preliminary performance data.

Data represent test results in zero wind. Adjust

for local conditions.

Performance data are derived from tests that

conform to ASAE Standard S398.1.

See Hunter Irrigation Products Catalog for

complete ASAE Certification Statement

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