F100 BIG GUN
®
OPERATING &
ADJUSTMENT INSTRUCTIONS
Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: [email protected] Web site: www.nelsonirrigation.com
F100-OAI-2
F100 BIG GUN
®
THE DRIVE SPOON:
Adjust to
increase or decrease drive power.
When to Adjust:
1. For low pressure operation.
2. For sloping terrain operation.
NOTE:
The factory setting of the drive spoon will produce 80 to 90 arm strokes per minutes
and an approximate rotation through 180° arc in one and a half minutes. Short, choppy arm
strokes usually indicate marginal pressure conditions and necessitate spoon adjustment. The
lower bearing assembly includes a spring loaded disc brake that does not need adjustment.
On sloping terrain, adjust the drive spoon 1/16” into the stream. For traveler operation, sloping
terrain will cause the nozzle pressure to fluctuate 4.3 PSI for every 10 feet of elevation change. A
counter balance kit is available for operation on a tilted riser.
For operation below 40 PSI, adjust the spoon 1/16” into the stream.
NOTE:
Operation below the
recommended pressure may result in improper mechanical operation, particularly where sloping
terrain conditions exist. For good irrigation droplet conditions, 55 PSI or greater is recommended.
The F100 is factory set for
typical operation and each
gun is water tested. Minor
adjustments may be required
to change drive operation.
Drive
Spoon
Nozzle
Secondary
Nozzle or Plug
Lower
Bearing
