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STATOR ADJUSTMENTS
STATOR ADJUSTMENTS
I
STATOR ADJUSTMENTS –
WHY AND WHEN ARE THEY NEEDED?
The adjustable stator is preset at the factory to match the nozzle installed in the rotor. The purpose
of the stator is to maintain a consistent and desirable speed of rotation. Rotors that turn too fast
cannot reach their published radius distance. Rotors that turn too slowly will irrigate with a higher
precipitation rate per revolution causing wet spots and run-off.
If nozzles are changed to a flow greater than the original factory nozzle, the speed of rotation
will become faster unless the appropriate stator adjustments are made. This is because there is
a greater amount of water passing the turbine that drives the gearbox. The opposite is true if a
smaller flow nozzle is installed without adjusting the stator - the rotor will slow down. In extreme
situations, the rotor may not rotate at all if the stator is not adjusted. Again, stator adjustments
are not required unless the nozzle flow is being changed or, the stator was set incorrectly at some
point in time.
Setting the stator is as simple as matching the stator setting number to the nozzle number being
used in the rotor. For example, if the nozzle in use is #20, then the stator setting will be #20. To
access the stator adjustment, first remove the riser’s filter screen as outlined in the section above.
STATOR ADJUSTMENTS –
G35, G70 & G75 RISERS
G35 risers have a self-adjusting variable stator and do not require adjustments.
Turn the riser upside down, remove the filter screen and view the stator area. Notice the black part
with the three sections extending outward from the center (FIGURE 57). This black part on G70
and G75 risers is called the adjustable stator plate. Beneath the adjustable stator plate is a gray
non-removable part with the three openings. This part is called the stator. The stator has a series
of numbers engraved into the plastic. These numbers are the nozzle size reference numbers.
To make an adjustment, use the blade end of the snap-ring tool or a bladed screwdriver to lift the
adjustable stator plate off the stator. To do so, place the tool under one of the two tabs on the post
at the center of the stator (FIGURE 58). Pry the tab upward and the stator plate will snap off.
To reset and install the adjustable stator plate,
notice the small cutout on each of the three
sections of the adjustable stator plate. Next, on
the stator find the nozzle number that is being
used. Simply align any one of the cutouts on the
adjustable stator plate with the desired nozzle
number on the gray stator (FIGURE 59). Then,
snap the adjustable stator plate down into
position. Once the stator plate is installed,
check to make sure the desired nozzle number
is visible in the cutout window. Finally, install
the filter screen as outlined above.
STATOR ADJUSTMENTS –
G80 RISERS
Turn the riser upside down, remove the filter
screen and view the stator area. Notice the
black part with the three sections extending
outward from the center (FIGURE 60). This
black part on G80 risers is called the adjustable
stator plate. Beneath the adjustable stator plate
is a gray non-removable part with the three
openings. This part is called the stator. The
stator has a series of numbers engraved into
the plastic. These numbers are the nozzle size
reference numbers.
To make an adjustment, rotate the adjustable
stator plate to the right in a clockwise direction
(FIGURE 61). Notice the small cutout or window
on the adjustable stator plate. As the adjustable
stator plate is rotated, the various nozzle
reference numbers will appear in the cutout/
window. Simply keep rotating the adjustable
stator plate until the desired nozzle number on
the gray stator appears in the cutout/window.
Double-check to make sure the desired nozzle
number is visible in the cutout/window. Finally,
install the filter screen as outlined in the filter
screen servicing section above.
Fig 57
Fig 58
Fig 59
Fig 60
Fig 61
Fig 57
Fig 58
Fig 59
Fig 60
Fig 61
Fig 57
Fig 58
Fig 59
FIGURE 57
FIGURE 60
FIGURE 58
FIGURE 61
FIGURE 59
