Nelson BIG BUN SR75 Instruction Manual

Shift Lever
Nozzle
Drive Vane
Drive Arm
Arm Weight
Trip Lever
Stops
Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
SR75 BIG GUN®
OM-SR75-5 10/13
SR75 BIG GUN®OPERATION & MAINTENANCE INSTRUCTIONS
SET UP FOR OPERATION:
1. Install desired Taper Ring size in ring nozzle
cap. The ring nozzle cap can be sufficiently
tightened by hand.
2. Adjust location of stops to give desired arc
of coverage. Stops must be mounted so that
arrows point toward each other and trip lever
is located between arrows. If the stops are
set incorrectly on the wrong end of the arc,
the sprinkler will fail to reverse.
NOTE ON LUBRICATION:
The SR75 sprinkler is lifetime lubricated and
does not require periodic lubrication. The ball
bearings in the HD lower bearing operate in a
water resistant lubricant that is packed in the
housing cavities and retained by seals. If repair
of the lower bearing is done, it is recommended
to use Nelson #6143 lubricant or a good grade
of water resistant lubricant such as Lubriplate
130-AA.
SR75 DRIVE ARM
ASSEMBLY COMPONENTS
The SR75 is available in fixed trajectory angles of
18°, 21°, 24°, 43°
10377 O-Ring, Non-Standard
.459 I.D. x .040 C.S.
10193 Spacer, Teflon Coated
6600 Seal
6598 Ball Bearing
6598 Ball Bearing
10189 Spring
10192 Spacer
6603 Nut
10231 Cap Assembly, Arm Bearing
Consists of: 1 10190 Cap, Arm Bearing
1 6563 O-Ring
10194 Spacer
10214 Spacer
10191 Cam
Lower Bearing Assembly (HD page 4,
CB page 5) Note: CB Bearing not available
for 18° center pivot gun.
1
CAUTION: Read operating instructions before
operating sprinkler or making any adjustments.
Never make adjustments or perform service while
sprinkler is in operation. Stand clear of operating
sprinkler. Stand clear of high velocity water stream.
Never direct water stream onto roadway or electrical
transmission lines.
4 8311 Screw,
#8-32 x .375”,
Self Tapping Pan Head

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
10/13
SR75 BIG GUN MAINTENANCE
SEE FRONT FOR DRIVE ARM ASSEMBLY COMPONENTS / SEE SR75 PARTS LIST FOR COMPLETE PARTS LIST AND DESCRIPTIONS
DISASSEMBLY
STEP 1 (Trip Lever)
Remove two #8311 screws and
#10185 cap.
STEP 2
Using small retaining ring pliers,
remove #8323-201 ring.
STEP 3
Remove one #8311 screw from the
shift stop bracket. Rotate the trip
lever to pull follower from spring
guide. Pull entire trip lever assembly
from gun. Inspect wear on the
#8282 follower and #8193 pin.
STEP 4 (Drive Arm)
Remove four #8311 screws.
Remove #10231 cap.
STEP 5
Using an 11/16” socket, remove the
#6603 nut from left side of arm.
#8193 Pin
#8282
Follower
Spring Guide
#8323-201
#8282
STEP 6
Holding the range tube, pull drive
arm from the right side until it is
free from hub.
STEP 7
Inspect both left and right #6598
ball bearings. Replace if worn or
corroded. Inspect #6600 seals
as well. Lubricate seal with silicon
grease prior to reassembly.
STEP 8 (Shift Lever)
Remove two #8311 screws and
the #10364 cap. Using retaining
ring pliers, remove #8323-212
ring.
STEP 9
Pull #10226-004 shift lever from
mount. Inspect the mount shaft
and shift lever bushing for wear.
2

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
SR75 BIG GUN MAINTENANCE
10/13
REASSEMBLY
STEP 1 (Shift Lever)
Slide #10226-004 shift lever onto
mount. Snap the #8323-212
retaining ring onto the mount.
Replace the #10364 cap and the
two #8311 screws.
STEP 2 (Drive Arm)
Assure the #10377 O-ring and
#10193 spacer is on the drive arm
shaft. Push the shaft all the way
into the right arm hub. From the
left side slide onto the arm shaft,
in sequence, the #10214 spacer,
#6598 bearing, #10194 spacer,
#10191 cam.
STEP 3
Make sure the #10191 cam is
correctly keyed into the slot on the
drive arm shaft. Notice the correct
orientation of the finger on the cam
for proper arm operation.
STEP 4
Continue the sequence of sliding
onto the drive arm shaft the
#10192 spacer and the #10189
spring. Notice the hook end of the
spring goes in first so the spring
wire loops around the finger of the
#10191 cam.
STEP 5
Thread on #6603 nut. Torque to 25
ft. lbs. using the 11/16” socket (metric
torque = 34 NM or 3.5 MKG).
Replace the lubricant.
SEE FRONT FOR DRIVE ARM ASSEMBLY COMPONENTS / SEE SR75 PARTS LIST FOR COMPLETE PARTS LIST AND DESCRIPTIONS
STEP 6
Replace the #10231 cap making
sure that the notch on the #10231
engages the spring tab on the
#10189.
STEP 7
Replace the 4 #8311 screws. Make
sure the drive arm rotates freely and
returns to its at-rest position.
3

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
HD LOWER BEARING MAINTENANCE
DISASSEMBLY (HD LOWER UNIT)
STEP 5
Fully coat #7007 O-Ring
with #9673 Silicone Grease
& #9680 Graphite. Install
prepared O-Ring into #7877
Spacer and mount onto
assembly.
SEE SR75 PARTS LIST FOR PARTS INFORMATION
STEP 3
Remove the #6998 Seal. To
remove the two #6559 Bearings
use a hammer and three blocks
of wood. Lightly tap uniformly
around inner race of bearing until
removed. Bearings are removed
from opposite sides of the #8472
Housing.
STEP 4
Install #6999 O-Ring in #7003
Retainer and assemble retainer
on shaft. Using method described
in disassembly (Lower Unit)
instructions Step 2, secure bearing
shaft from rotating. Torque Retainer
to 95-110 ft. lbs. Apply a light
coating of #9673 Silicone Grease
to O.D. of Retainer. Assemble
#6998 Lip Seal. Orient with lip
side out. Metric Torque = 129-149
NM or 13-15 MKG.
STEP 2
The #10083 Retainer Assembly
is removed by using spanner
wrench. To hold the #7031 Shaft
Assembly from rotating insert
two 5/16-18 bolts (#6635) into
shaft top. Clamp bolt heads
into a vise securely. Remove
retainer and #8472 Housing
from bearing shaft.
STEP 3
Assemble #6566 Gasket.
Press on #8472 Housing.
Fully pack housing with #6143
Lubricant. Assemble #6559
Bearing into housing.
STEP 2
Place #6997 Lip Seal into #6858
cover as shown with Nelson name
toward ball bearing. Pack #6559
Bearing with #6143 lubricant
or equivalent. (See “Notes on
Lubrication” on the front cover.)
Press bearing into #6858 Cover.
Slide cover assembly onto bearing
shaft. CAUTION: Do not get grease
on brake surfaces. To clean plastic
brake, use soap and water (solvents
may damage plastic). Clean #6858
cover with acetone.
10/13
#10083
#6997
#6559
#6998 #10083
#7007
#7877
#10087 Spacer Assembly
REASSEMBLY
(HD LOWER UNIT)
STEP 1
Assemble #7009 Dust Seal onto
#7031 Shaft Assembly. Slide
#6996 Brake Ring onto shaft.
Locate the four studs of the brake
ring in the center holes between
the smaller threaded holes.
#7031
#7009
STEP 1
Remove three #7990 or #7991
bolts from flange. Separate
#8472 housing from #10087
Spacer Assembly. Remove
#7007 O-Ring from #10087
Spacer Assembly.
#8472
#7991
or 7990
#10087
#7007
STEP 4
Remove #6585 Cover from
shaft. Remove #6997 Seal from
cover. Remove #6996 Brake
Ring and #7009 Dust Seal
from shaft.
Inspect all parts for wear and
replace as required.
#6858
#6997
#6996
(Bronze Model #9492)
STEP 6
Assemble #8967 O-Ring into
the Flange Adapter. Mount
Flange Adapter using required
Bolts. Torque Bolts to 130-150
inch pounds.
O-Ring
#8967
4
#6996
or #9492

DISASSEMBLY (CB LOWER UNIT)
STEP 5
Remove #10717 Housing
Assembly from the #6996
Brake Ring and #10696 Adapter
Assembly. Inspect Sleeve Bearing
#10717 for wear and replace as
required.
STEP 6
Remove the #6996 Brake Ring
from the #10696 Adapter
Assembly. Inspect all parts
for wear and replace as
required.
SEE SR75 PARTS LIST FOR PARTS INFORMATION
STEP 4
Remove #10719 Nipple Bearing,
#10701 Washer and #10699,
#10700 and #10705 Seals.
Inspect all parts for wear and
replace as required.
STEP 3
Place a .25” thick by 2.25”
wide piece of steel in the slot
of the #10719 Nipple Bearing.
Remove the #10719 Nipple
Bearing by holding the piece of
steel with a wrench and slowly
unthreading from the #10696
Adapter Assembly.
Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
STEP 1
Remove three #6010 screws.
Remove 10088-xxx Flange
Assembly Connection.
STEP 9
Remove the #6997 Upper
Seal. Inspect the seal for wear
and replace as required.
STEP 8
Remove the #10698 Wear
Ring. Inspect the Wear Ring
for wear and replace as
required.
STEP 7
Remove three #10706 screws.
CB LOWER BEARING MAINTENANCE
10/13
5
STEP 2
To prevent the #10696 Adapter
assembly from rotating insert two
5/16-18 bolts into the adapter’s
threaded holes. Clamp bolt
heads securely into a vice.

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
CB LOWER BEARING MAINTENANCE
REASSEMBLY (CB LOWER UNIT)
SEE SR75 PARTS LIST FOR PARTS INFORMATION
STEP 3
Insert #10719 Nipple Bearing,
#10701 Washer and #10699,
#10700 and #10705 Seals into
Assembly. Start threading the
#10719 Nipple bearing into the
#10696 Adapter Assembly by
hand.
STEP 4
To prevent the #10696 Adapter
assembly from rotating insert two
5/16-18 bolts into the adapter’s
threaded holes. Clamp bolt heads
securely into a vice.
STEP 6
Place #6010 screws into #10088-
xxx Flange Assembly Connection and
tighten.
10/13
STEP 1
Slide the #6996 Brake Ring on to
the #10696 Adapter Assembly.
Each lug on the #6996 should slide
into the middle hole between any
two-threaded holes.
STEP 2
Insert #6996 Brake Ring and
#10696 Adapter Assembly into
#10717 Housing Assembly.
6
WARRANTY AND DISCLAIMER: Nelson Big Gun®Sprinklers are warranted for one year from date of original sale to be free of
defective materials and workmanship when used within the working specifications for which the products were designed and under
normal use and service. The manufacturer assumes no responsibility for installation, removal or unauthorized repair of defective parts.
The manufacturer’s liability under this warranty is limited solely to replacement or repair of defective parts and the manufacturer will not
be liable for any crop or other consequential damages resulting from defects or breach of warranty. THIS WARRANTY IS EXPRESSLY IN
LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
PARTICULAR PURPOSES AND OF ALL OTHER OBLIGATIONS OR LIABILITIES OF MANUFACTURER. No agent, employee or representative
of the manufacturer has authority to waive, alter or add to the provisions of this warranty, nor to make any representations or warranty
not contained herein. This product may be covered by one or more of the following U.S. Patent Nos. D297,453, 3,559,887, 3,744,720,
4,193,548, 4,669,663 and other U.S. Patents pending or corresponding issued or pending foreign patents.
STEP 5
Place a .25” thick by 2.25” wide piece
of steel in the slot of the 10719 Nipple
Bearing. Reassemble the 10719
Nipple Bearing by holding the piece
of steel with a wrench and slowly
tightening into the 10696 Adapter
Assembly to a torque of 90 ft-lbs.

SR100 BIG GUN®OPERATION AND MAINTENANCE INSTRUCTIONS
Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
SR100 BIG GUN®
OM-SR100-9 PN03083 2/18
NOTE ON LUBRICATION: The Big Gun®sprinkler
is lifetime lubricated and does not require periodic
lubrication. The ball bearings in the H.D. lower bearing
operate in a water resistant lubricant that is packed in
the housing cavities and retained by seals. If repair of
the lower bearing is done, it is recommended to use
Nelson #6143 lubricant or a good grade of water
resistant lubricant such as Lubriplate 130-AA.
BE CAREFUL: Read operating instructions before
operating sprinkler or making any adjustments. Never
make adjustments or perform service while sprinkler is
in operation. Stand clear of operating sprinkler. Stand
clear of high velocity water stream. Never direct water
stream onto roadway or electrical transmission lines.
WARRANTY AND DISCLAIMER
Nelson Big Gun®Sprinklers are warranted for one year from date
of original sale to be free of defective materials and workmanship
when used within the working specifications for which the product was
designed and under normal use and service. The manufacturer assumes
no responsibility for installation, is limited solely to replacement or repair
of defective parts, and the manufacturer will not be liable for any crop
or other consequential damages resulting from any defects or breach
of warranty. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSES AND
OF ALL OTHER OBLIGATIONS OR LIABILITIES OF MANUFACTURER.
No agent, employee or representative of the manufacturer has authority
to waive, alter or add to the provision of the warranty, nor to make any
representations or warranty not contained herein.
SET UP FOR OPERATION:
1. Install nozzle. If using ring nozzle set, install desired
ring size in ring nozzle cap. The ring nozzle cap
can be sufficiently tightened by hand.
If using the 100 DN ring nozzle, correct orientation
is important. For reliable sprinkler operation, be sure
to orient the ring with the correct side out and the
“up” at the top of the nozzle. Incorrect orientation
can result in failure of sprinkler to drive.
2. Adjust location of reverse stops to give desired arc
of coverage. Stops must be mounted so that arrows
point toward each other and the trip lever is located
between arrows. If the stops are set incorrectly on
the wrong end of the arc, the sprinkler will fail to
reverse.
3. The SR100 is factory set for normal rotation speed.
If a faster or slower speed is desired, move arm
weight backward for faster operation or forward
for slower operation.

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
2/18
SR100 MAINTENANCE
SEE SR100 PARTS LISTS FOR COMPLETE PARTS LIST AND DESCRIPTION
DISASSEMBLY REASSEMBLY
STEP 4 (Counterweight)
Inspect seal spacer and counter-weight
spacer for wear. If spacers show
excessive wear, replace both spacers
and #6600 Seals. To remove seals,
drive thin-bladed screwdriver under
lip of seal and pry seal out. To replace
seals, use block of wood over seal
making sure lip is to the outside, and
secure by lightly tapping on wooden
block until seal lip is flush with hub.
Apply a light coating of #9673 Silicone
Grease to #6600 Seal Lips.
STEP 5 (Shift Lever)
Remove #10070-001 Cap Assem-
bly. Using external retaining ring
pliers, remove #8323-017 Retain-
ing Ring. Pull Shift lever from
mount. A gear puller will help in
removing the lever. Inspect all parts
for wear and replace as required.
STEP 9
Fill two #10067-001 Arm Cap
Assemblies with #6143 Grease
and snap into place. Install two
#6565 Retaining Rings. Arm
must have free movement at this
point. If arm feels sticky, assure
that lip seals at counterweight and
right arm hub are not rubbing on
each other.
STEP 10 (Trip Lever)
Mount trip lever assembly along
with spring guide onto their
respective pins. Install #8323-004
Retaining Ring. Install #8263 Cap
using two #8311 Screws. Install
#8409 Washer and #6714 Cotter
Pin onto spring guide.
STEP 3
Using a thin-bladed screwdriver,
push #8327-001 Spacer back
into arm hub. Holding onto counter-
weight, remove drive arm and
counterweight. Be careful not to
damage seals.
STEP 8
Holding counterweight in place on the
left side of shift lever, roll drive arm
into position shown by pushing on the
left arm bearing. Work #8327-001
Spacer into seal on counterweight.
Be sure spacer is correctly positioned
in counterweight to prevent cutting of
the seal lip. Push shaft through the
bearings and spacers and assemble
#6603 Nut. Torque to 25 ft. lbs. using
two 11/16” sockets. (Metric Torque =
34 NM or 3.5 MKG.)
STEP 2 (Drive Arm)
Using internal retaining ring pliers,
remove #6565 Retaining Ring
from both arm hubs. Remove two
#10067-001 Arm Caps. Using two
11/16” sockets, loosen and remove
one #6603 Nut from left side of
arm. Holding the opposite #6603
Nut, pull shaft free from hub.
STEP 7 (Drive Arm)
Lubricate #6600 Seal lips with
#9673 Silicone Grease. Install
#8327-001 Spacer flush with
#6600 Seal in left arm hub.
Insert two #6607-001 conical
Spacers into seals on inside of
counterweight and right drive arm
hub. Start #8297 Shaft into right
arm hub.
STEP 1 (Trip Lever)
Remove #6714 Cotter Pin from
#8197 Pin. Remove two #8311
Screws and #8263 Cap. Using
small retaining ring pliers, remove
#8323-004 Retaining Ring. Pull
entire trip lever assembly and
spring guide from gun. At this time
inspect wear on #8282 Follower.
Replace if worn.
STEP 6
At the upper portion of the gun,
inspect the mount shaft for wear.
Press the #8325 Shift Lever
assembly onto the mount. With
external retaining ring pliers, snap
the #8323-017 Retaining Ring
on. Screw on #10070-001 Cap
Assembly.
Spring
Guide
#8197
#8282
#8323-004
#6600
Counterweight
#8323-017
Mount Shaft
#10070-001
#8325
Left Hub
Right Hub
#8327-001
#8297
#10067-001

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
LOWER BEARING MAINTENANCE
DISASSEMBLY (LOWER UNIT)
STEP 14
Remove #6585 Cover from shaft.
Remove #6997 Seal from cover.
Remove #6996 Brake Ring and
#7009 Dust Seal from shaft.
Inspect all parts for wear and
replace as required.
REASSEMBLY (LOWER UNIT)
STEP 15
Assemble #7009 Dust Seal onto
#7031 Shaft Assembly. Slide
#6996 Brake Ring onto shaft.
Locate the four studs of the brake
ring in the center holes between
the smaller threaded holes.
STEP 19
Install 7007-001 O-Ring into
Spacer and mount onto assembly.
SEE BACK PAGE FOR PARTS LIST
STEP 13
Remove the #6998 Seal. To
remove the two #6559 Bearings
use a hammer and three blocks
of wood. Lightly tap uniformly
around inner race of bearing until
removed. Bearings are removed
from opposite sides of the #8472
Housing.
STEP 18
Install #6999 O-Ring in #7003
Retainer and assemble retainer on
shaft. Using method described in
disassembly (Lower Unit) instructions
Step 12, secure bearing shaft from
rotating. Torque Retainer to 95-110
ft. lbs. Apply a light coating of #9673
Silicone Grease to O.D. of Retainer.
Assemble #6998 Lip Seal. Orient
with lip side out. Metric Torque =
129-149 NM or 13-15 MKG.
STEP 12
The #10083 Retainer Assembly
is removed by using spanner
wrench. To hold the #7031 Shaft
Assembly from rotating insert two
5/16-18 bolts (#6635) into shaft
top. Clamp bolt heads into a vise
securely. Remove retainer and
#8472 Housing from bearing
shaft.
STEP 17
Assemble #6566 Gasket. Press
on #8472 Housing. Fully pack
housing with #6143 Lubricant.
Assemble #6559 Bearing into
housing.
STEP 11
Remove three #7990 or #7991
bolts from flange. Separate
#8472 housing from #10087
Spacer Assembly. Remove #7007
O-Ring from #10087 Spacer
Assembly.
STEP 16
Place #6997 Lip Seal into #6858 cover
as shown with Nelson name toward
ball bearing. Pack #6559 Bearing
with #6143 lubricant or equivalent.
(See “Notes on Lubrication” on the
front cover.) Press bearing into #6858
Cover. Slide cover assembly onto
bearing shaft. CAUTION: Do not get
grease on brake surfaces. To clean
plastic brake, use soap and water
(solvents may damage plastic). Clean
#6858 cover with acetone.
2/18
#8472
#10083
#6858
#6997
#6996
#7031
#6996
or #9492
#7009
#6997
#6559
#6998 #10083
#7007-001
#10087 Spacer Assembly
#7991
or 7990
#10087
#7007
(Bronze Model #9492)
STEP 20
Assemble #8967 O-Ring into the
Flange Adapter. Mount Flange
Adapter using required Bolts. Torque
Bolts to 130-150 inch pounds.
O-Ring
#8967

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [email protected] Web site: www.nelsonirrigation.com
LOWER BEARING ASSEMBLY PARTS LIST
2/18
BEARING ASSEMBLY, SR100
part number description qty.
6559 Bearing, Ball, 50 x 80 x 16mm 2
6566 Gasket, Housing - HD100 2
6635 Screw, .3125-18 x 688” Hex Hd. Cap 4
6858 Cover, Part Circle - HD100 1
6996 Ring, Brake - HD100 1
6997 Seal, Upper - HD100 1
6998 Seal, Center - HD100 1
6999 O-Ring, -224 1
7004 Spring, Brake - HD100 8
7006 Screw, .3125-18 x 3.50” Hex Skt Hd Cap 3
7007-001 O-Ring, -331, Special, Externally Lubed 1
7009 Seal, Dust - HD100 1
7031 Shaft Assembly - HD100 1
7990 Screw, .3125-18 x 4.25” Hex Hd Cap 3
7991 Screw, .3125-18 x 4” Hex Skt Hd Cap 3
8472 Housing - HD100 1
8967 O-Ring -231, Special 1
10083 Retainer Assembly - HD100 1
10086 Flange Assembly, Nelson 1
10087 Spacer Assy, Alum. - HD100 1
10087-003 Spacer Assy, Brass - HD100 1
10088-001 Flange Assembly, 2” FNPT 1
10088-002 Flange Assembly, 2.5” FNPT 1
10088-003 Flange Assembly, 2” FBSP 1
10137-001 Flange Assembly, 2” ANSI/DIN/EURO 1
10297 Retainer, O-Ring - HD100 1
10342 O-Ring, -225 1
10545 O-Ring, -149 1
MOUNTING HARDWARE
part number description qty.
7000 Gasket, Nelson Flange 1
7039 Screw, .3125-18 x .75” Hex Skt Hd Cap 6
10149 Gasket, Euro Flange 1
6858
** The Flange Assemblies include O-Ring 8967.
10297
10545 7007-001
7007-001
10087 SPACER ASSY
2-PIECE SPACER (2002+)
10087-003 SPACER ASSY
1-PIECE SPACER (PRE-2002)
10088-002 2.5” FNPT 7991

SR/SRA150 BIG GUN®OPERATION AND MAINTENANCE INSTRUCTIONS
Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: [phone] Fax: [phone] E-mail: [email protected] Web site: www.nelsonirrigation.com
SR/SRA150 BIG GUN®
SET UP FOR OPERATION:
1. Install nozzle. If using ring nozzle set,
or taper ring nozzle, install desired ring
size in ring nozzle cap. Assure the ring
is centered. The ring nozzle cap can
be sufficiently tightened by hand.
2. Adjust location of arc stops to give
desired arc of coverage. Stops must
be mounted so that arrows point toward
each other and the trip lever is located
between arrows. If the stops are set
incorrectly on the wrong end of the
arc, the sprinkler will fail to reverse.
3. The SR150 and SRA150 are factory
set for normal rotation speed. If a
faster or slower speed is desired,
move arm weight backward for
faster operation or forward for slower
operation.
4. To vary the trajectory angle of the
SRA150 simply adjust the turn-buckle
and dial in the desired trajectory
using the calibrated scale. Varying
trajectory angle is simple, and can
be used to increase wind-fighting
ability or to avoid obstacles such
as power lines in the field.
OM-SR/SRA150-4
WARRANTY AND DISCLAIMER
Nelson Big Gun®Sprinklers are warranted for one year from date of original sale to be free of defective materials and workmanship when used within
the working specifications for which the product was designed an under normal use and service. The manufacturer assumes no responsibility for
installation, is limited solely to replacement or repair of defective parts, and the manufactures will not be liable for any crops or other consequential
damages resulting from any defects or breach of warranty. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSES AND OF ALL OTHER OBLIGATIONS
OR LIABILITIES OF MANUFACTURER. No agent, employee or representative of the manufacturer has authority to waive, alter or add to the provision
of the warranty, nor to make any representations or warranty not contained herein.
NOTE ON LUBRICATION: The SR/SRA150 sprinkler is lifetime lubricated and does not require periodic lubrication.
The ball bearings in the H.D. lower bearing operate in a water resistant lubricant that is packed in the housing cavities
and retained by seals. If repair of the lower bearing is done, it is recommended to use Nelson #6143 lubricant or a
good grade of water resistant lubricant such as Lubriplate 130-AA.
BE CAREFUL: Read operating instructions before operating sprinkler or making any adjustments. Never make
adjustments or perform service while sprinkler is in operation. Stand clear of operating sprinkler. Stand clear of high
velocity water stream. Never direct water stream onto roadway or electrical transmission lines.
Drive Vane
The SR150 is available in fixed trajectory angles of 21°,24°, 27° and 43°.
A trajectory modification using a 12° wedge kit #11237 is available.
Drive Arm
Nozzle
Arm Weight
Shift Lever
Trip Lever
HD Lower Bearing
Stops
The SRA150 is a variable trajectory model with adjustability from 15-45°.
Drive Vane
Drive Arm
Nozzle
Arm Weight
Shift Lever
Trip Lever
HD Lower Bearing
Stops
Turn-Buckle (for trajectory adjustment)
Calibrated Scale (not shown)

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: [phone] Fax: [phone] E-mail: [email protected] Web site: www.nelsonirrigation.com
2/14
SR/SRA150 MAINTENANCE
SEE SR/SRA150 PARTS LISTS FOR COMPLETE PARTS LIST AND DESCRIPTION
DISASSEMBLY REASSEMBLY
STEP 4
Inspect seal spacer and counter-
weight spacer for wear. If spacers
show excessive wear, replace both
spacers and #6600 Seals. To
remove seals, drive thin-bladed
screwdriver under lip of seal and
pry seal out. To replace seals, use
block of wood over seal making
sure lip is to the outside, and secure
by lightly tapping on wooden block
until seal lip is flush with hub.
STEP 5
Remove #10070-001 Cap
Assem-bly. Using external retaining
ring pliers, remove #8323-017
Retaining Ring. Pull Shift lever from
mount. A gear puller will help in
removing the lever.
STEP 9
Snap in two #10067-001 Arm
Cap Assemblies. Install two
#6565 Retaining Rings. Arm
must have free movement at this
point. If arm feels sticky, assure
that lip seals at counterweight and
right arm hub are not rubbing on
each other.
STEP 10
Mount trip lever assembly along
with spring guide onto their
respective pins. Install #8323-04
Retaining Ring. Install #8263 Cap
using two #8311 Screws making
sure #8265 gasket is in place.
Install #8409 Washer and #7814
Cotter Pin onto spring guide.
STEP 3
Using a thin-bladed screwdriver,
push #8327-001 Spacer back
into arm hub. Holding onto
counterweight, remove arm and
weight. Be careful not to damage
seals.
STEP 8
Holding counterweight in place on
the left side of shift lever, roll drive arm
into position shown by pushing on the
left arm bearing. Work #8327-001
Spacer into seal on counterweight.
Be sure spacer is correctly positioned
in counterweight to prevent cutting
of the seal lip. Push shaft through
the bearings and spacers and
assemble #6603 Nut. Torque to 25
ft. lbs. using two 11/16” sockets.
STEP 2 (Drive Arm)
Using internal retaining ring pliers,
remove two #6565 Retaining
Rings from both arm hubs. Remove
two #10067-001 Arm Caps. Using
two 11/16” sockets, loosen and
remove one #6603 Nut from left
side of arm. Holding the opposite
#6603 Nut, pull shaft free from hub.
STEP 7 (Drive Arm)
Lubricate #6600 Seal lips with
#9673 Silicone Grease. Install
#8327-001 Spacer flush with
#6600 Seal in left arm hub. Insert
#6607-001 (coated spacer) in right
arm hub and #6607 (uncoated
spacer) in left counterweight seal
(or a second #6607-001 coated
spacer). Start #8297 Shaft into right
arm hub.
STEP 1 (Trip Lever)
Remove #6714 Cotter Pin from
#8197 Pin. Remove two #8311
Screws and #8263 Cap. Using
small retaining ring pliers, remove
#8323-004 Retaining Ring. Pull
entire trip lever assembly and
spring guide from gun. At this time
inspect wear on #8282 Follower.
Replace if worn.
STEP 6 (Shift Lever)
At the upper portion of the gun,
inspect the mount shaft for wear.
Press the #8589 Shift Lever
assembly onto the mount. With
external retaining ring pliers,
snap the #8323-017 Retaining
Ring on. Be sure #8272 Cap
Gasket is in place and in good
condition. Replace #10070-001
Cap Assembly
Spring
Guide
#8197
#8282
#8323-004
#6600
Counterweight
#8323-017
Mount Shaft
#10070-001
#8589
Left Hub
Right Hub
#8327-001
#8465
#10067-001

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: [phone] Fax: [phone] E-mail: [email protected] Web site: www.nelsonirrigation.com
LOWER BEARING MAINTENANCE
DISASSEMBLY (LOWER UNIT) REASSEMBLY (LOWER UNIT)
STEP 14
Remove #8400 Cover from shaft.
Remove #8372 Seal from cover.
Remove #8371 brake ring and
#8473 dust seal from shaft.
Inspect all parts for wear and
replace as required.
STEP 15
Assemble #8473 Dust Seal onto
#8459 Shaft Assembly. Slide
#8371 Brake Ring onto shaft.
Locate the four studs of the brake
ring in the center holes between
the smaller threaded holes.
STEP 19
Assemble #8461 Gasket. Install
#8475-001 O-Ring in #8401
Flange and mount onto assembly
using three #8462 Bolts. Torque
bolts to 130-150 in. lbs.
SEE BACK PAGE FOR PARTS LIST
STEP 13
Remove the #8373 Seal. To remove
the two #6253 Bearings use a
hammer and three blocks of
wood. Lightly tap uniformly
around inner race of bearing until
removed. Bearings are removed
from opposite sides of the #8405
Housing.
STEP 18
Install #6548 O-Ring in #8402
Retainer and assemble retainer on
shaft. Using method described in
disassembly (Lower Unit) instruct-
ions Step 12, secure bearing shaft
from rotating. Torque on #10068
Retainer Assembly to 100-120 ft.
lbs. Assemble #8373 Lip Seal.
Orient with lip side out.
STEP 12
The #10068 Retainer Assembly
is removed by using a spanner
wrench with unit still bolted into
vise. NOTE: An extension handle
on the spanner wrench may be
needed to loosen the retainer.
Remove retainer and flange,
and slide #8405 Housing from
bearing shaft.
STEP 17
Assemble #8461 Gasket. Press
on #8405 Housing. Fully pack
housing with #6143 Lubricant.
Assemble #6253 Bearing into
housing.
STEP 11
After removing bearing from gun,
insert two 5/16-18” #8408 Bolts
into shaft top. Clamp bolt heads
into a vise securely. Remove three
#8462 Bolts (or #10153-001 for
ANSI/DIN).
STEP 16
Place #8372 Lip Seal into #8400
cover as shown with Nelson name
toward ball bearing. Pack #6253
Bearing with #6143 lubricant
or equivalent. (See “Notes on
Lubrication” on the front cover.)
Press bearing into #8400 Cover.
Slide cover assembly onto bearing
shaft. CAUTION: Do not get
grease on brake surface.
2/14
#8462
#10068
#8405
#8400
#8372
#8371
#8459
#8371
#8473
#8372
#6253
#8373
#8402
#8475-001
#8401
10069 Flange Assembly

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: [phone] Fax: [phone] E-mail: [email protected] Web site: www.nelsonirrigation.com
LOWER BEARING ASSEMBLY PARTS LIST
2/14
SEE SR150/SRA150 PARTS LISTS FOR DETAILS ON OTHER PARTS
NELSON/EURO
FLANGE
*Flange assembly includes 8475-001
8458 NELSON/EURO FLG. CONN.

SR200 BIG GUN®OPERATION & AdjUSTmENT INSTRUCTIONS
Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [e-mail] Web site: www.nelsonirrigation.com
SR200 BIG GUN®
SR200-OA-3 8/12
NOTE ON LUBRICATION: The SR200 sprinkler
is lifetime lubricated and does not require periodic
lubrication. The ball bearings in the H.D. lower
bearing operate in a water resistant lubricant that
is packed in the housing cavities and retained by
seals. If repair of the lower bearing is done, it is
recommended to use Nelson #6143 lubricant or
a good grade of water resistant lubricant such as
Lubriplate 130-AA.
BE CAREFUL: Read operating instructions before
operating sprinkler or making any adjustments.
Never make adjustments or perform service while
sprinkler is in operation. Stand clear of operating
sprinkler. Stand clear of high velocity water stream.
Never direct water stream onto roadway or electrical
transmission lines.
WARRANTY AND DISCLAIMER
Nelson Big Gun®Sprinklers are warranted for one year from date of original
sale to be free of defective materials and workmanship when used within
the working specifications for which the product was designed and under
normal use and service. The manufacturer assumes no responsibility for
installation, is limited solely to replacement or repair of defective parts,
and the manufactures will not be liable for any crop or other consequential
damages resulting from any defects or breach of warranty. THIS WARRANTY
IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR PARTICULAR PURPOSES AND OF ALL OTHER OBLIGATIONS OR
LIABILITIES OF MANUFACTURER. No agent, employee or representative of
the manufacturer has authority to waive, alter or add to the provision of the
warranty, nor to make any representations or warranty not contained herein.
1. Securely connect SR200 Big Gun to traveller
or riser designed to handle the loads of the
operating sprinkler. Take care not to bottom out
the bolts in the flange yet allow for at least 1/2”
engagement of the bolt threads.
NOTE: 9017 Nelson Flange has a 5.75” bolt circle with
six equally spaced threaded holes 3/8-16 UNC-2B x .75”
deep. 9254 Euro Flange has a 5.118” (130mm) bolt circle
with six equally spaced threaded holes M8 x 1,25-6H x .76”
(19,3mm) deep.

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: [phone] Fax: [phone] [e-mail] Web site: www.nelsonirrigation.com
8/12
SR200 OPERATION & AdjUSTmENT
2. Install Nozzle on end of Range Tube. If using
a Ring Nozzle, Install desired Ring size in Cap.
Assure Ring is centered. Ring Nozzle Cap and
Nozzle can be sufficiently tightened by hand.
3. Adjust location of Reverse Stops to give desired
arc of coverage. Stops must be mounted such
that the arrows point towards each other with
the Trip Lever located between them. If the Stops
are set incorrectly on the wrong end of the arc,
the sprinkler will fail to reverse.
4. The SR200 is factory set for normal rotation
speed. If a faster or slower speed is desired,
move the Arm Weight backward for faster
operation or forward for slower operation.
5. The SR200 is capable of using a Secondary Nozzle
for in-close coverage. To use this feature, remove
the supplied 6201 Plug and replace with the 7RN
Series Nozzle of your choice. The supplied 7V Vane
must be used to maintain proper stream integrity.