Hunter G835 User manual

TTS GOLF ROTOR OWNERS MANUAL
InstallatIon, operatIon & servIcIng technIques
for g835, g870, g875, g880, g990 & g995 rotors

Table of conTenTs
INTRODUCTION .......................................................................................................................................................................................1
MODELING NUMBERING SYSTEM ........................................................................................................................................................2
INSTALLATION AND OPERATION ..........................................................................................................................................................3
Pipe Connections – All Models......................................................................................................................................................3
Solenoid Connections – Electric VIH Models ...............................................................................................................................4
On-Auto-Off Selection – Electric VIH Models...............................................................................................................................5
Control Tubing Connections – C.O.M Models Converted To Hydraulic Conguration ...........................................................6
RISER SERVICING AND ADJUSTMENTS ................................................................................................................................................7
Upper Snap-ring Removal – G800 Series ......................................................................................................................................7
Upper Snap-ring Removal – G900 Series ......................................................................................................................................8
Riser Removal – All Models ............................................................................................................................................................9
Arc Adjustment Preparation – G35, G75 & G95 Part-Circle Risers..............................................................................................9
Arc Adjustment Procedure – G35, G75 & G95 Adjustable Part-Circle Risers...........................................................................10
Nozzle Replacement – G70 Risers ...............................................................................................................................................11
Nozzle Replacement – G35 & G75 Risers.................................................................................................................................... 12
Nozzle Replacement – G80 Risers ...............................................................................................................................................13
Nozzle Replacement – G90 Risers ...............................................................................................................................................14
Nozzle Replacement – G95 Risers ...............................................................................................................................................15
Riser Seal Replacement – G35, G70 & G75 Risers......................................................................................................................16
Riser Seal Replacement – G80 Risers...........................................................................................................................................17
Riser Seal Replacement – G90 & G95 Risers...............................................................................................................................19
Riser Filter Screen Servicing – All TTS Rotors .............................................................................................................................20
Stator Adjustments – Why and when are they needed?............................................................................................................21
Stator Adjustments – G35, G75, & G95 Adjustable Part-Circle Risers......................................................................................21
Stator Adjustments – G80 Risers..................................................................................................................................................22
Stator Adjustments – G90 & G95 Risers ......................................................................................................................................23
Riser Replacement – Full-Circle Risers.........................................................................................................................................24
Riser Replacement – G35, G75 & G95 Adjustable Part-Circle Risers........................................................................................24
Upper Snap-ring Installation Tips ................................................................................................................................................24
Upper Snap-ring Installation – G800 Series ................................................................................................................................24
Upper Snap-ring Installation – G900 Series ................................................................................................................................25
INLET VALVE REMOVAL, SERVICE AND INSTALLATION....................................................................................................................26
Valve Identication ........................................................................................................................................................................26
Inlet Valve Removal – Disengaging the Safety Interlock Feature..............................................................................................27
Inlet Valve Removal – G800 Series...............................................................................................................................................28
Inlet Valve Removal – G900 Series...............................................................................................................................................30
Inlet Valve Servicing – All Models ................................................................................................................................................32
Inlet Valve Installation – Safety Warnings....................................................................................................................................33
Inlet Valve Installation – G800 Series ...........................................................................................................................................33
Inlet Valve Installation – G900 Series ...........................................................................................................................................38
SOLENOID, PILOT VALVE & REGULATOR SERVICING - ALL ELECTRIC VIH MODELS...................................................................41
Access to Flange Compartment Components ...........................................................................................................................41
Solenoid & Pilot Valve Assembly Removal..................................................................................................................................43
Solenoid & Servicing and Replacement......................................................................................................................................44
Pilot Valve Replacement ...............................................................................................................................................................47
Connecting Solenoid to the Pilot Valve.......................................................................................................................................48
Attaching The Assembled Solenoid and Pilot Valve to the Flange Compartment .................................................................49
Attaching Selector Cap to the Solenoid .....................................................................................................................................50
Pressure Regulator Purpose, Settings and Adjustment Procedures.........................................................................................51
Pressure Regulator Adjustment ...................................................................................................................................................52
Pressure Regulator Replacement.................................................................................................................................................53
Attaching the Flange Compartment Lid .....................................................................................................................................53

THANK YOU FOR PURCHASING HUNTER’S TTS
GOLF & LARGE TURF ROTORS. TTS rotors include
all the features and quality you expect from rotors
in this category with the added unique benet of
Total Top Serviceability. With Hunter’s TTS rotors,
every serviceable component within the rotor can be
accessed from the top without digging. So as ongoing
routine maintenance is required, the surrounding turf
remains playable, productive and pleasing to the eye.
This manual covers all aspects of installation, operation
and servicing for Hunter’s TTS rotors including models
G835, G870, G875, G880, G990 and G995.
For the latest information, specications and the
location of the distributor near you, visit the Hunter
Golf website at www.huntergolf.com. Additionally,
Hunter Technical Services can be contacted at
800-733-2823 and choose option #3.
HunTer Golf
IntroductIon

MODEL NUMBERING SYSTEM
TTS RoToRS –All ModelS
Hunter TTS golf rotors are available in two basic body styles. These are the G800 Series and the G900 Series rotors.
Each of these body styles is available in either the Check-O-Matic valve conguration (C.O.M.) or, the Electric Valve-
In-Head (E.V.I.H. or more commonly known as V.I.H.) valve conguration:
G800C = a G800 body in a C.O.M. valve conguration*
G800E = a G800 body in a V.I.H valve conguration
G900C = a G900 body in a C.O.M. valve conguration*
G900E = a G900 body in a V.I.H valve conguration
Each body style will accept specic gear-driven risers:
G835 = G800 body style tted with a G35 adjustable part-circle riser
G870 = G800 body style tted with a G70 full-circle riser
G875 = G800 body style tted with a G75 adjustable part-circle riser
G880 = G800 body style tted with a G80 full-circle riser
G990 = G900 body style tted with a G90 full-circle riser
G995 = G900 body style tted with a G95 adjustable part-circle riser
Combining a body style, gear-driven riser and valve conguration together creates a model number system that
clearly denes the primary characteristics of the rotor:
Examples -
G875C = a G800 body with a G75 adjustable riser and a C.O.M. valve
G990E = a G900 body with a G90 full-circle riser and a V.I.H valve
* All C.O.M. TTS rotors can be converted to the Normally Open Hydraulic conguration.
2


Typical NPT or BSP
Swing Joint Fitting
with tapered threads
Typical ACME
Swing Joint Fitting
with O-ring seal
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

Typical NPT or BSP
Swing Joint Fitting
with tapered threads
Typical ACME
Swing Joint Fitting
with O-ring seal
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INSTALLATION AND OPERATION
PiPe ConneCTionS – All ModelS
All TTS rotors have a 1½ inch Acme threaded inlet. Acme inlet threads have become the preferred thread
conguration in the golf course irrigation market. Do Not use NPT or BSP threaded ttings to connect piping to
TTS rotors. Acme threads are not compatible with NPT or BSP ttings. Acme threaded ttings and swing joints are
available from your local irrigation supply company. Following are the available options for connecting TTS rotors to
the irrigation system piping:
 • PVCswingjointswitha1½inchmaleAcmeoutlettting.
 • Approvedexibleswingjointswitha1½inchmaleAcmeoutlettting.
 • Replacethenalttingoftheexistingswingjointwitha1½inchmaleAcmeoutlettting(ttingmustbethe
same brand as swing joint).
 • UsetheappropriateHunterAcmeAdaptertting.TheseareavailablefromHunterdistributorsinvariousNPT
andBSPsizes.(Teon™tapeorPVCcementmustbeusedbetweentheconnectingNPTorBSPthreads)
Following are the minimum recommended swing joint sizes for TTS rotors. However, follow your Irrigation
Consultant’s recommendations where applicable:
 • G835Seriesrotors–1inchswingjointwitha1½inchAcmeoutlettting
 • G870Seriesrotors–1¼inchswingjointwitha1½inchmaleAcmeoutlettting
 • G880Seriesrotors–1½inchswingjointwitha1½inchmaleAcmeoutlettting
 • G990Seriesrotors–1½inchswingjointwitha1½inchmaleAcmeoutlettting
Do Not useTeon™tape,PVCcementorotherthreadsealantmaterialstoconnecttheTTSrotortotheAcme
tting.Ifneeded,asmallamountofDowCorning™#111ValveLubricantorpurepetroleumjellylikeVaseline™
can be used around the O-Ring on the Acme tting. Other lubricants can deteriorate the tting and cause leakage.
Thread the Acme tting into the G800 Series rotor clockwise until it bottoms out (no further rotation is possible). Then
turn the tting in reverse (counter-clockwise) ½ turn. The tting will still seal around the O-Ring and this loosened
position will allow minor rotation of the rotor’s body after installation.
TYPICAL NPT OR BSP
SWING JOINT FITTING
WITH TAPERED THREADS
TYPICAL ACME SWING
JOINT FITTING WITH
O-RING SEAL
3

Solenoid ConneCTionS –eleCTRiC ViH ModelS
TTS Electric Valve-In-Head models have solenoid lead wires protruding from the rotor’s body in the traditional
manner. Controller eld wires can be connected to the rotor, using the specied watertight wiring connectors, at this
sub-surface position. If specied or requested otherwise, the solenoid lead wires and controller eld wires can be
pulledupintotherotor’sangecompartmentwheretheinitialconnectionscanbemade(recommended).Regardless
oftheinitialconnectionpoint,futuresolenoidrepairconnectionscanbemadewithintheangecompartment.(see
Solenoid Servicing later in this manual)
Caution! Whenconnectingsolenoidleadsoutsideoftheangecompartment,DONOTpullsolenoidleads
downward in an attempt to provide more exposed solenoid wire. Electric TTS rotors REQUIRE slack in solenoid wiring
withintheangecompartmenttofacilitateservicingofthepilotvalveandsolenoid.Removingtheslackcanlimit
movement of the On-Auto-Off selector and require cutting of solenoid wires to service pilot valve and/or solenoid.


Recommended Wiring
Connections


RECOMMENDED WIRING CONNECTIONS
DO NOT PULL ON
SOLENOID LEAD WIRING
4

on-AuTo-off SeleCTion –eleCTRiC ViH ModelS
Electric Valve-In-Head TTS rotors are equipped with a selector to control operation of the rotor. The selector is
locatedontheangecompartment’slid.Fromthefactory,theselectorissettotheAUTOpositionwhichislocated
midway between the ON and OFF positions (g 1).
Several tools are available to make ON-AUTO-OFF selections:
 • T-HandleTool–PN319100
 • HunterWrench–PN471720
 • Snap-ringTool–PN251000
The ON-AUTO-OFF selector’s function and recommended operation is as follows:
AUTO – The selector comes from the factory in the AUTO position. When in this position, the rotor will not activate
unless the controller sends 24 volts of power to the rotor’s solenoid. (g 1)
OFF–Usingoneofthetoolslistedabove,turningtheselectorapproximately¼turnclockwisefromtheAUTO
position will manually deactivate the rotor. In the OFF position, (g 2) the rotor will not activate even if the controller
sends 24 volts of power to the rotor’s solenoid. To restore activation by the controller’s programming, return the
selector to the AUTO position.
ON–Usingoneofthetoolslistedabove,turningtheselector¼turncounter-clockwisefromtheAUTOpositionwill
manually activate the rotor. (g 3) The rotor will continue to operate until the selector is returned to the AUTO or Off
position. De-activation of the sprinkler may take several seconds.
Caution! Do not over-tighten the selector when turning to the manual OFF position. Turn only until resistance is felt.
Over-tightening can cause premature failure of the solenoid’s plunger seal and lead to the rotor leaking water in the
AUTO position.
FIG 1 FIG 2 FIG 3
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5

ConTRol Tubing ConneCTionS –C.o.M ModelS ConVeRTed To
HydRAuliC ConfiguRATion
Inhydraulicinstallations,theangecompartmentshouldbeusedtomaketheControlTubingconnectionstothe
rotor.Thisallowsfortubingconnections,pressuretestsandushingofthecontrollines-allwithoutdigging.
ConvertingC.O.M.modelstotheHydraulicconguration–Removethetwostainlesssteelscrewsandlifttheange
compartmentlidtoexposetheangecompartment.Findtheendofthe1⁄8inchtubingthatcomesintotheange
compartment from the bottom of the rotor (g 4). Check-O-Matic (“C”) versions of TTS rotors can be converted for
use in Normally Open Hydraulic systems by removing the end cap on the 1⁄8inchtubing.Todoso,slidethe¼inch
tuberetainertowardstheendofthetube(g5).Then,pulltoremovetheendcapwithattached¼inchtuberetainer
from the brass connector tting (g 6).
Toconnectthe¼inchcontroltubefromthecontrollertotheTTSrotortubing,insert¼inchtubingfromcontroller
intothebottomoftheangecompartment.Nextslidethe¼inchtuberetainer(fromendcapsuppliedwithrotor)
ontothe¼inchControlTubing.Thenconnectthe¼inchControlTubingtotherotor’s1⁄8inch Control Tubing by
pressingtogetheratthebrasstting.Finally,slidethe¼inchtuberetainertowardsthebrassttingtolockthe
tube in place.
FIG 4 FIG 5 FIG 6
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Fig 4
Fig 5
Fig 6
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Fig 4
Fig 5
Fig 6
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
Fig 4
Fig 5
Fig 6
6

RISER SERVICING AND ADJUSTMENTS
Caution! The riser assembly is under spring tension. Eye protection should be worn and safe-handling procedures
followed when servicing this product.
Tools Needed (varies with riser model)
 • T-HandleTool–PN319100
 • HunterWrench–PN471720
 • Snap-ringTool–PN251000
 • Needle-NosePliers
 • FlatBladeScrewdriver
 • PhillipsScrewdriver
uPPeR SnAP-Ring ReMoVAl –g800 SeRieS
Hold Snap-ring Tool vertical over the rotor’s upper snap ring. Align the metal end of the snap-ring tool to the
indicator on the snap-ring’s rubberized wiper seal (g 7). Use the palm of the other hand to drive the tool downward
& through the rubberized membrane. Tool should penetrate about ½ inch into the snap-ring assembly (g 8). While
holding the tool within the snap-ring, press the tool’s handle downward and away from the center of the rotor. As the
tool is pressed downward, the snap-ring will lift from the rotor (g 9). While using the tool to hold the snap-ring in
this elevated position, use the other hand to pull the snap-ring from the rotor. If the snap-ring’s rubberized wiper seal
appears to be the only part that is lifting, the tool has not penetrated into the snap-ring far enough.
FIG 7 FIG 8 FIG 9
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7

uPPeR SnAP-Ring ReMoVAl –g900 SeRieS
Prior to removal of the upper snap-ring assembly, the rubberized logo cap must be removed and the riser assembly
must be pressed below the snap-ring’s rubberized seal. If the procedure below is not followed, the upper snap-ring
assembly cannot be removed from the G900 Series rotors:
Remove the stainless screw from the center of the rubberized logo cap using a Phillips screwdriver (g 10). Prior to
removing the rubberized logo cap, note that the arrows on the logo indicate the position of the nozzles on the riser
assembly. As the rubberized logo cap is removed, note there is a protruding pin on the underside of the logo cap
(g 11). This pin is the alignment feature on the rubberized logo cap that must be inserted correctly during assembly
in order for the arrows on the rubberized logo cap to be positioned over the nozzles below. Note which hole the pin
ts into on top of the riser (g 12). Also note that the pin and hole locations are different for the G90 and G95 risers.
Once the rubberized logo cap is removed, use the heal on the palm of your hand to forcefully press the riser
assembly down (g 13) and below the rubberized wiper seal on the snap-ring assembly (g 14). When the rotor is
dry (without water within) more force is required. If sprinkler is installed and has been activated, the water acts to
lubricate the wiper making the procedure much easier.
FIG 10 FIG 11 FIG 12
FIG 13 FIG 14 FIG 15
FIG 16 FIG 17
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Fig 16
Fig 17
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Fig 16
Fig 17
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Fig 10
Fig 11
Fig 12
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Fig 10
Fig 11
Fig 12
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Fig 10
Fig 11
Fig 12
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Fig 13
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Fig 14
Fig 15
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Fig 13
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Fig 14
Fig 15
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
Fig 13
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Fig 14
Fig 15
8

To remove the snap-ring assembly, hold Snap-ring Tool vertical over the rotor’s upper snap-ring area. Align the metal
end of the snap-ring tool to the indicator on the snap-ring’s rubberized wiper seal (g 15). Use the palm of the other
handtodrivethetooldownward&throughtherubberizedmembrane(g16).Toolshouldpenetrateabout¼inch
into the snap-ring assembly. While holding the tool within the snap-ring, press the tool’s handle downward and away
from the center of the rotor. As the tool is pressed downward, the snap-ring will lift from the rotor. While using the
tool to hold the snap-ring in this elevated position, use the other hand to pull the snap-ring from the rotor (g 17). If
the snap-ring’s rubberized wiper seal appears to be the only part that is lifting, the tool has not penetrated into the
snap-ring far enough.
RiSeR ReMoVAl –All ModelS
To remove the riser assembly, rst remove the upper snap ring as outlined above. Insert the Hunter Wrench, T-Handle
ToolortipoftheSnapRingtoolintotheriser’sliftsocket,turn¼turnandlifttheriserfromtherotor’sbody.Thelift
socket for G870, G875 and G880 models is protected by a rubberized membrane on the rubberized logo cap and can
be located by nding the raised line depiction of the socket’s shape (g 18). G990 and G995 risers have a removable
rubberized logo cap so the lift up socket is accessed after removing the logo cap, directly on top of the riser (g 19).
In some cases, the riser can simply be pulled from the rotor’s body by hand once the upper snap-ring assembly is
removed (g 20).
ARC AdjuSTMenT PRePARATion –g35, g75 & g95 PART-CiRCle RiSeRS
All Hunter adjustable arc rotors have a xed stop on the right side of the arc and an adjustable stop on the left side of
the arc. Arc adjustments can be made with the riser in hand or, after installation with the rotor not activated or, while
the rotor is in operation. For convenience of installation, new rotors from the factory are set to approximately
180 degrees and the long-range nozzle is positioned to the right x side of the arc.
Before setting the arc, it is necessary to rst establish where the right side xed arc stop is located:
FIG 21 FIG 22 FIG 23
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Fig 23
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Fig 24
FIG 18 FIG 19 FIG 20
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Fig 18
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Fig 19
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Fig 20
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Fig 18
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Fig 19
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Fig 20
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Fig 18
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Fig 19
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Fig 20
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Fig 22
9

With any adjustable riser held in hand – to expose the rotate-able nozzle housing (also known as the turret), press
down on the riser seal assembly to compress the riser’s retraction spring (g 21). Seal assembly must be held in this
position. If riser is installed within the rotor’s body, the lift socket and tool can be used to expose the turret (g 22).
Rotate the nozzle housing back and forth until the right side arc stop is found. This is the xed (non-adjustable) side
of the arc. All adjustments should be made with the nozzle housing in this right stop position.
With riser installed and rotor operating (g 23) – Rotate the nozzle housing back and forth until the right side arc stop
is found. This is the xed (non-adjustable) side of the arc. All adjustments should be made with the nozzle housing in
this right stop position.
ARC AdjuSTMenT PRoCeduRe –g35, g75 & g95 AdjuSTAble PART-CiRCle RiSeRS
All adjustments are initiated by inserting the small end of the T-handle tool or the plastic end of the Hunter wrench
into the riser’s adjustment socket. The adjustment socket can be found on the riser’s rubber cover by locating the
circular depiction with arrows going in opposite directions (g 24). Insert the tool through the rubberized membrane
to engage the adjustment mechanism. Again, all arc adjustments must be made with the turret oriented to the right
xed side of the arc as outlined in the section above.
To increase the arc of coverage – insert the tool into the adjustment socket (g 25) and make sure the nozzle housing
is at the right arc stop position. Each full turn of the tool to the right (clockwise) will increase the arc by 45 degrees.
Two full turns of the tool will result in a 90 degree increase in the arc of coverage. The arc is innitely adjustable from
40 to 360 degrees. When maximum arc is reached, the tool will stop turning or, a ratcheting sound will be heard. To
check the arc setting, rotate the turret back and forth. If further adjustments are required, repeat the steps above.
To decrease the arc of coverage – insert the tool into the adjustment socket (g 25) and make sure the nozzle housing is
at the right arc stop position. Each full turn of the tool to the left (counter-clockwise) will decrease the arc by 45 degrees.
Two full turns of the tool will result in a 90 degree decrease in the arc of coverage. The arc is innitely adjustable from
40 to 360 degrees. When minimum arc is reached, the tool will stop turning or, a ratcheting sound will be heard. To
check the arc setting, rotate the turret back and forth. If further adjustments are required, repeat the steps above.
See “Riser Replacement” section for instructions on aligning right side xed arc stop to landscape and snap ring installation.
FIG 24 FIG 25


Fig 25
Fig 26



Fig 25
Fig 26

10

nozzle RePlACeMenT –g70 RiSeRS
To view and replace the nozzles, it is necessary to:
With riser held in hand – compress the riser spring by grabbing the riser seal assembly (g 27), pressing downward
and then holding riser rmly to prevent the spring from moving upwards.
Note – Riser assembly must be removed to changed nozzles. This is necessary since stator setting must also be
adjusted when changing nozzles. See section titled, “Stator Adjustments – Why and When Are They Needed”.
The G70 riser has two color-coded opposing nozzles. All G70 nozzles are retained in the nozzle housing (turret) with
setscrews (g 28). Each setscrew has a 3⁄32 inch Allen wrench recess at the top. When replacing both G70 nozzles, it is
important to note that the nozzles must be the same color. These color-coded sets offer the optimum efciency for
eachowrange.
On the G70’s rubberized logo cap, locate the two opposing arrowhead shaped areas directly above the nozzles (g 29).
Insert the metal end of the Hunter wrench or a 3⁄32 inch wrench into the membrane within the arrow that is directly above
the nozzle to be replaced. Engage the setscrew and turn counter-clockwise until the bottom of the setscrew clears the
top of the nozzle.
Note the nozzle’s orientation prior to removal to aid in the nozzle installation process. Using needle-nose pliers, grab
the right side of the nozzle on its outer ring and pull outward to remove the nozzle. In some cases it may be necessary
to grab the nozzle’s orice to remove the nozzle. Discard the old nozzle as the removal process can damage the
nozzle and negatively affect the performance.
Insert the replacement nozzle into the nozzle housing with the tab positioned to the right. Press rmly until it stops.
Turn the nozzle-retaining setscrew clockwise while making sure that the setscrew does not distort the nozzle. Lower
the setscrew in front of the nozzle only as far as necessary to prevent nozzle movement. Take care not to position the
setscrew in front of or against the nozzle’s orice as performance can be negatively affected.
If the nozzle size or color has been changed, please note that the adjustable stator will likely need to be reset. Refer
to the Stator Adjustment section below for information on how to reset the stator.
FIG 27 FIG 28 FIG 29


Fig 27



Fig 28
Fig 29



Fig 28
Fig 29
11

nozzle RePlACeMenT –g35 & g75 RiSeRS
To view and replace the nozzles, it is necessary to compress the riser spring by grabbing the riser seal assembly (g 27
above), pressing downward and then holding riser rmly to prevent the spring from moving upwards.
The G35 nozzles are yellow with single orices. The G75 nozzles are color-coded with two orices. All nozzles are retained
in the nozzle housing (turret) with a setscrew (g 30). Each setscrew has a 3⁄32 inch Allen wrench recess at the top.
On the G35 or G75 rubberized logo cap, locate the arrowhead shaped area directly above the nozzle (g 31). Insert
the metal end of the Hunter wrench or a 3⁄32 inch wrench into the membrane within the arrow that is directly above the
nozzle to be replaced. Engage the setscrew and turn counter-clockwise until the bottom of the setscrew clears the
top of the nozzle.
Note the nozzle’s orientation prior to removal to aid in the nozzle installation process. Using needle-nose pliers, grab
the right side of the nozzle on its outer ring and pull outward to remove the nozzle. In some cases it may be necessary
to grab the nozzle’s orice to remove the nozzle. Discard the old nozzle as the removal process can damage the
nozzle and negatively affect the performance.
Insert the replacement nozzle into the nozzle housing with the smaller orice positioned to the right. Press rmly
until it stops. Turn the nozzle-retaining setscrew clockwise while making sure that the setscrew does not distort the
nozzle. Lower the setscrew in front of the nozzle only as far as necessary to prevent nozzle movement. Take care not
to position the setscrew in front of or against the nozzle’s orice as performance can be negatively affected.
If the nozzle size or color has been changed, please note that the adjustable stator will likely need to be reset. Refer
to the Stator Adjustment section in this manual for information on how to reset the stator.
FIG 30 FIG 31



Fig 30
Fig 31



Fig 30
Fig 31
12

nozzle RePlACeMenT –g80 RiSeRS
To view and replace the nozzles, it is necessary to compress the riser spring by grabbing the riser seal assembly
(g 32), pressing downward and then holding riser rmly to prevent the spring from moving upwards.
The G80 riser has three color-coded opposing nozzles. All G80 nozzles are retained in the nozzle housing by the
shroud (g 33) that covers the nozzle housing (turret). To remove the shroud, use a Phillips head screwdriver and
remove the stainless steel screw at the top of the riser by turning it counter-clockwise. Prior to removal of the shroud,
take note that the large nozzle arrow on top of the shroud’s rubberized logo cap is orientated directly over the larger,
long-range nozzle (g 34). This will help with the shroud installation process later.
While rmly holding the compressed spring and seal assembly downward, grab and lift the shroud off the nozzle
housing (g 35). If preferred, slowly lift and release the compressed spring and seal assembly then remove them from
the riser assembly. Note the orientation of the seal assembly for installation later. Or alternatively, continue to rmly
hold the compressed spring and seal assembly downward while removing and replacing nozzles.
To remove the G80 long-range primary nozzle, use needle-nose pliers to grab the nozzle’s orice then pull
outward (g 36). Discard the old nozzle as the removal process can damage the nozzle and negatively affect the
performance. Prior to nozzle replacement, note that there is a notch (recessed area) on the nozzle’s outer ring. Insert
the replacement nozzle into the nozzle housing with this recess positioned at the top. The correct orientation of the
recessed area is important as it is part of the G80’s nozzle retention system. Press in rmly until the nozzle stops.
The G80’s short-range and mid-range nozzles are performance matched to all G80 long-range nozzles. As a result,
replacement of these nozzles is normally required only when a nozzle has been damaged. If replacement does become
necessary, it is important to note that these nozzles must be installed with the correct orientation for optimal performance.
Prior to removal of the short-range or mid-range nozzle, note the differences between the nozzle on the left and
right. When facing the short-range and mid-range nozzles:
 • G80FullCircle-Theshort-rangenozzleisblackandontherightside
- The mid-range nozzle is blue and on the left side.
To remove the short or mid-range nozzle, grab and rotate the nozzle 90 degrees to the outside (away from turret)
then wiggle and pull it upward. To install a short-range or mid-range nozzle, position the nozzle so the orice is
pointing outward and to the side. Drop the nozzle into position by wiggling it downward. The nal step is to rotate
the nozzle 90 degrees pointing it in the opposite direction of the primary long-range nozzle. This action locks the
nozzle in the nozzle housing.
Prior to installation of the shroud, replace the retraction spring and seal assembly (if removed prior). To install the
nozzle housing shroud, position the shroud over the nozzle housing. The single opening for the Primary long-range
nozzle in the shroud must be positioned directly over the nozzle. Press into position and conrm all three nozzle
openings are lined up with the nozzles inside. Install the stainless steel screw into the rubberized logo cap by turning it
clockwise until hand tight. If the nozzle size or color has been changed, please note that the adjustable stator will likely
need to be reset. Refer to the Stator Adjustment section in this manual for information on how to reset the stator.
FIG 32
FIG 33 FIG 34
FIG 35
FIG 36


Fig 32

Fig 36


Fig 35



Fig 33
Fig 34

Fig 36


Fig 35



Fig 33
Fig 34
13

nozzle RePlACeMenT –g90 RiSeRS
To view and replace the nozzles, it is necessary to compress the riser spring by grabbing the riser seal assembly
(g 37), pressing downward and then holding riser rmly to prevent the spring from moving upwards.
The G90 riser has three color-coded opposing nozzles. All G90 nozzles are retained in the nozzle housing (turret) with
three setscrews (gs 38 & 39). Each setscrew has a 3⁄32 inch Allen recess at the top. Insert the metal end of the Hunter
wrench or a 3⁄32 inch wrench into setscrew that is above the nozzle to be replaced. Engage the setscrew and turn
counter-clockwise until the bottom of the setscrew clears the top of the nozzle.
To remove the long-range primary nozzle, rst note the nozzle’s orientation prior to removal. The G90’s primary nozzle
has a protruding rail that must engage the slot on the right side of the nozzle opening. Understanding this will help
during the installation process later. Using needle-nose pliers, grab the nozzle’s outer ring next to the recess on the
right side of the nozzle opening and then pull outward. If necessary, grab the nozzle’s orice to gain a better grip.
Discard the old nozzle as the removal process can damage the nozzle and negatively affect the performance.
Insert the replacement nozzle into the nozzle housing. Press rmly until the nozzle stops. Turn the nozzle-retaining
setscrew clockwise while making sure that the setscrew does not distort the nozzle. Lower the setscrew in front of
the nozzle only as far as necessary to prevent nozzle movement. Take care not to position the setscrew in front of or
against the nozzle’s orice as performance can be negatively affected.
If the nozzle size or color has been changed, please note that the adjustable stator will likely need to be reset. Refer
to the Stator Adjustment section in this manual for information on how to reset the stator.
The G90’s short-range and mid-range nozzles are performance matched to all G90 long-range nozzles. As a result,
replacement of these nozzles is normally required only when a nozzle has been damaged. If replacement does
become necessary, it is important to note that these nozzles must be installed in the correct orientation for optimal
performance.
Prior to removal of the G90’s short-range or mid-range nozzle, note the differences between the nozzle on the left
and right.
 • G90FullCircle-Theshort-rangenozzleisblackandontheleftside.(g39)
- The mid-range nozzle is blue and on the right side. (g 39)
Note - In late 2010, the short-range nozzle will change to red.
Using needle-nose pliers, grab the nozzle’s orice then pull outward. Discard the old nozzle as the removal process
will damage the nozzle and negatively affect the performance. Insert the replacement nozzle into the nozzle housing
and press rmly until it stops. Turn the nozzle-retaining setscrew clockwise to a position in front of the nozzle that
prevents nozzle movement. Take care not to position the setscrew in front of or against the nozzle’s orice as
performance can be negatively affected.
FIG 37 FIG 38 FIG 39


Fig 37



Fig 38
Fig 39



Fig 38
Fig 39
14

nozzle RePlACeMenT –g95 RiSeRS
To view and replace the nozzles, it is necessary to compress the riser spring by grabbing the riser seal assembly
(g 37), pressing downward and then holding riser rmly to prevent the spring from moving upwards.
The G95 riser has three color-coded nozzles that all face the same direction. All G95 nozzles are retained in the nozzle
housing (turret) with three setscrews (g 40). Each setscrew has a 3⁄32 inch Allen recess at the top. Insert the metal
end of the Hunter wrench or a 3⁄32 inch wrench into setscrew that is above the nozzle to be replaced. Engage the
setscrew and turn counter-clockwise until the bottom of the setscrew clears the top of the nozzle (g 41).
To remove the long-range primary nozzle, rst note the nozzle’s orientation prior to removal. The G95’s primary nozzle
has a protruding rail that must engage the slot on the right side of the nozzle opening. Understanding this will help
during the installation process later. Using needle-nose pliers, grab the nozzle’s outer ring next to the recess on the
right side of the nozzle opening and then pull outward (g 42). If necessary, grab the nozzle’s orice to gain a better
grip. Discard the old nozzle as the removal process can damage the nozzle and negatively affect the performance.
Insert the replacement nozzle into the nozzle housing. Press rmly until the nozzle stops. Turn the nozzle-retaining
setscrew clockwise while making sure that the setscrew does not distort the nozzle. Lower the setscrew in front of
the nozzle only as far as necessary to prevent nozzle movement. Take care not to position the setscrew in front of or
against the nozzle’s orice as performance can be negatively affected.
If the nozzle size or color has been changed, please note that the adjustable stator will likely need to be reset. Refer
to the Stator Adjustment section in this manual for information on how to reset the stator.
The G95’s short-range and mid-range nozzles are performance matched to all G95 long-range nozzles. As a result,
replacement of these nozzles is normally required only when a nozzle has been damaged. If replacement does
become necessary, it is important to note that these nozzles must be installed in the correct orientation for optimal
performance.
Prior to removal of the G95’s short-range or mid-range nozzle, note the differences between the nozzle on the left
and right.
 • G95Adj.Arc-Theshort-rangenozzleisblackandontheleftside.(g40)
- The mid-range nozzle is green and on the right side. (g 40)
Note - In 2010, the short-range nozzle will change to red.
Using needle-nose pliers, grab the nozzle’s orice then pull outward. Discard the old nozzle as the removal process
will damage the nozzle and negatively affect the performance. Insert the replacement nozzle into the nozzle housing
and press rmly until it stops. Turn the nozzle-retaining setscrew clockwise to a position in front of the nozzle that
prevents nozzle movement. Take care not to position the setscrew in front of or against the nozzle’s orice as
performance can be negatively affected.
FIG 40 FIG 41 FIG 42




Fig 40
Fig 41
Fig 42




Fig 40
Fig 41
Fig 42




Fig 40
Fig 41
Fig 42
15

RiSeR SeAl RePlACeMenT –g35, g70 & g75 RiSeRS
The G35, G70 and G75 riser seal assemblies and the compressed retraction spring are retained on the risers with the
rubberized logo cap assembly. It is necessary to remove the rubberized logo cap assembly in order to replace the
riser seal assembly. To remove the rubberized logo cap assembly, it is necessary to fully compress the riser spring by
grabbing the riser seal assembly (g 43), pressing downward and then holding riser rmly to prevent the spring from
moving upwards.
Caution! The riser assembly is under spring tension. Eye protection should be worn and safe-handling
procedures followed when servicing this product.
Hold the riser seal assembly down with one hand. Using the other hand, locate the two hidden screws that retain the
rubberized logo cap assembly. These can be found by pressing down on the rubberized logo cap close to the “H”
and the “r” on the Hunter logo (gs 44 & 45). The Phillips headed retaining screws are directly beneath these
depressions. Insert the Phillips screwdriver through the rubberized membrane and engage each retaining screw. Turn
counter-clockwise to remove each screw.
Prior to removing the rubberized logo cap assembly, note its orientation as it relates to the nozzles below. This will
help with the assembly process later. Remove the rubberized logo cap and set aside.
While still holding the compressed riser seal assembly and retraction spring with one hand, use the other hand
to grasp the bottom of the riser assembly. Slowly release the compression of the retraction spring until it is fully
extended and no pressure is felt.
Prior to removing the riser seal assembly, note the orientation and sequence of the three individual seal assembly
parts (g 46). The Upper Seal Support is on top and its lower surface nests perfectly with the top of the riser seal. The
Riser Seal is the rubberized part in the middle. The Lower Seal Support (also known as the Upper Spring Support) has
an upper surface that nests perfectly to the lower surface of the Riser Seal. The Support’s lower surface also provides
a nest for the retraction spring. During assembly, these three parts must keep this sequence and orientation in order
for the seal assembly to function properly.
If any one of the three parts in the seal assembly needs replacement, it is highly recommended that all three
components be replaced. To re-assembly the riser, place the seal assembly on top of the retraction spring and then
compress. While rmly holding the retraction spring and seal assembly down, place the logo cap assembly on top
of the riser in the correct orientation. Insert the two stainless-steel screws through the rubberized membranes on the
logo cap and hand tighten with a Phillips screwdriver.
FIG 43 FIG 44 FIG 45 FIG 46


Fig 43

Fig 44

Fig 45
Fig 46






Fig 43

Fig 44

Fig 45
Fig 46






Fig 43

Fig 44

Fig 45
Fig 46






Fig 43

Fig 44

Fig 45
Fig 46




16

RiSeR SeAl RePlACeMenT –g80 RiSeRS
The G80 riser seal-block assembly and the compressed retraction spring are retained on the riser with the shroud/
logo-cap assembly. It is necessary to remove this assembly in order to service the G80’s riser seal components. To
remove the shroud/logo-cap assembly, it is necessary to fully compress the riser spring by grabbing the riser seal-
block assembly, pressing downward and then holding riser rmly to prevent the spring from moving upwards (g 47).
Caution! The riser assembly is under spring tension. Eye protection should be worn and safe-handling
procedures followed when servicing this product.
Press the riser seal-block assembly down with one hand and hold rmly. Locate the stainless-steel retaining screw
on top of the shroud/logo-cap assembly (g 48). Use a Phillips screwdriver to engage the screw and turn counter-
clockwise to remove. Prior to removal of the shroud, take note that the large nozzle arrow on top of the shroud’s
rubberized logo cap is orientated directly over the larger, long-range nozzle. This will help with the shroud installation
process later.
While rmly holding the compressed spring and seal-block assembly downward, grab and lift the shroud off the
nozzle housing then set it aside (g 49). Slowly lift to release the spring compression. Note the orientation of the
seal-block assembly for installation later (g 50). Next, remove the seal-block assembly and retraction spring.
The riser seal on G80 risers include two primary components - the seal block assembly and the face-seal. The seal
block assembly sits on top of the retraction spring and has two sealing surfaces. First, the seal block has an o-ring
around the outside. If the o-ring is damaged, deteriorated or missing, the riser will leak water while the sprinkler
is operating. The second sealing surface on the seal-block assembly is on the underside. The angled surface on
the underside of the seal-block assembly is the interface for the face-seal. If this angled interface surface is cut or
otherwise damaged, the riser can leak water during sprinkler operation.
The face-seal is the second primary component to the G80’s riser seal design. The face-seal is the white plastic
angled ring that is position at the base of the stainless-steel portion of the G80’s riser. If the face-seal is damaged,
deteriorated or missing, the riser will leak during sprinkler operation.
If the riser is leaking during sprinkler operation, the o-ring, the interface and the face-seal must be inspected in
order to determine the cause of the leakage. If the o-ring is damaged, it can easily be replaced by removing the
damaged o-ring from the seal-block and replacing it with a new one. Use care to ensure that the o-ring is not cut or
twisted during the installation process. If the interface is damaged, the entire seal-block must be replaced. Also, if the
interface is damaged it is highly likely that the face-seal is damaged as well and needs replacement.
To replace the face-seal, slide it upwards and off the riser assembly. Replacement face-seals must t very snug to
the stainless-steel on the riser. As a result, there may be considerable resistance when attempting to install the new
face-seal. To make installation easier, the face-seal’s diameter can be expanded by placing it in the sun for several
minutes. Or, if the repair is being done in the shop, placing the face-seal in warm water for several minutes will cause
expansion as well.
Slide the new face-seal down and onto the riser. Make sure that it is pressed all the way until it is seated rmly against
the ledge at the base of the stainless-steel portion of the riser. Install the retraction spring and seal-block assembly
onto the G80 riser. Press down on the seal-block to compress the retraction spring and hold rmly in this position.
To install the nozzle housing’s shroud/logo-cap assembly, position it over the nozzle housing. The single opening for
the Primary long-range nozzle in the shroud must be positioned directly over the long-range (largest) nozzle. Press
into position and conrm all three nozzle openings are lined up with the nozzles inside. Install the stainless steel screw
into the rubberized logo cap by turning it clockwise until hand tight.
17