855RB and DT55RB Series Arc Pattern Adjustment
The left side of the sprinkler’s part-circle arc pattern is non-adjustable, requiring all arc pattern adjustments to be
made on the right side of the pattern. Adaptive arc adjustment enables the pattern to be set in 5° increments, ranging
from 40° minimum, to 330° maximum. Standard part-circle arc settings for 1/4, 1/2, 3/4, and continuous full-circle
rotation are indicated on the riser assembly, enabling the watering pattern to be easily set prior to installation.
Note:
The 855RB and DT55RB sprinkler conversion assembly arc pattern is factory-set to 180° (1/2 circle).
Adaptive Arc Adjustment – 40° to 330°
1. Insert the end of the Multipurpose Tool (#995-83) into the slot provided in the top of
the cap. Hook the inner edge of the cap to pull the riser assembly up. Grasp the riser
assembly firmly below the arc adjustment band to prevent retraction. See
Figure 7
.
2. Slowly rotate the nozzle turret back and forth to locate the current left and right
travel limits. Leave the nozzle turret rotated to the left travel limit. See
Figure 8
.
3. Align the nozzle turret with the left watering border by rotating the ratcheting riser
assembly in either direction. See
Figure 9
.
Caution: Never attempt to turn the ratcheting riser assembly during operation.
Forcing the riser assembly to turn can result in severe sprinkler damage.
4. Rotate the nozzle turret clockwise to the right travel limit. See
Figure 10
.
5. Squeeze and hold the arc adjust band at the ribbed section. Rotate the nozzle turret
in either direction to the desired right limit, then release pressure on adjustment band.
See
Figure 11
.
6. Slowly rotate the nozzle turret back and forth to check the adjusted arc pattern.
7. Check the arc pattern again during sprinkler operation. Fine tune the arc as needed
to achieve the optimum watering pattern.
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Turn to Left
Travel Limit
Turn Riser to
Align with
Left Border
Turn to Right
Travel Limit
Squeeze Arc
Adjust Band
at Ribs
Multipurpose
Tool (#995-83)
5. Press the seal retainer into the body until it bottoms
out – just below the bottom of the snap ring groove.
See
Figure 5
.
6. Fit the snap ring onto the riser assembly, orienting
the stepped side facing up (as shown in the cross
section in
Figure 6
).
7. Insert either end of the snap ring into the groove
just above the seal retainer. Continue working the
ring into the groove until it is fully seated and flush
against the seal retainer.
Note:
When properly installed, the snap ring end gap
will measure approximately 1/2” (13 mm).
Figure 6
Figure 5
Snap Ring
Arc Adjust
Band
