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ARC ADJUSTMENT PROCEDURE
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
(FIGURE 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 (FIGURE 22). Rotate the nozzle housing
back and forth until the right side arc stop is found. This is the fixed (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
(FIGURE 23) – Rotate the nozzle housing back and forth
until the right side arc stop is found. This is the fixed (non-adjustable) side of the arc. All adjustments
should be made with the nozzle housing in this right stop position.
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ARC ADJUSTMENT PREPARATION
I
ARC ADJUSTMENT PREPARATION –
G35, G75, G85 & G95 PART-CIRCLE RISERS
All Hunter adjustable arc rotors have a fixed 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 fixed side of the arc.
Before setting the arc, it is necessary to first establish where the right side fixed arc stop is located:
Fig 22
Fig 25
Fig 26
Fig 23
Fig 25
Fig 26
Fig 24
FIGURE 21
FIGURE 24
FIGURE 22
FIGURE 25
FIGURE 23
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 (FIGURE 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 fixed side of the arc as
outlined in the previous section.
To increase the arc of coverage
– insert the tool
into the adjustment socket (FIGURE 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 infinitely adjustable from 40 to 360 degrees.
When maximum arc is reached, the tool will
stop turning or, a ratcheting sound will be heard.
Newer model G35 and G75 risers will adjust to a
non-reversing full-circle mode when set to the
full-circle position.
To decrease the arc of coverage
– insert the tool
into the adjustment socket (FIGURE 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 infinitely 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 fixed arc stop and snap
ring installation.
