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SR/SRA150 BIG GUN

®

 OPERATION AND MAINTENANCE INSTRUCTIONS

 

Nelson Irrigation Corporation   848 Airport Rd.   Walla Walla, WA  99362 USA   Tel: 509.525.7660    Fax: 509.525.7907   E-mail: nelson@nelsonirr.com   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)

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