Valley Center Pivot 7000 Series, Owner'S Manual, Page: 82 / 106

MAINTENANCE
82 Center Pivot 7000, 8000, 8120 Series
Machine Alignment
Standard Alignment Adjustment
1. Loosen the hardware securing control bar to the
switch pivot arm. See Figures 82-1 and 82-2.
2. Adjust the jam nuts clockwise or counter-clock-
wise no more than 1/4 of a turn at one time. See
Figures 82-1 and 82-2, and the adjustment chart
below.
ADJUSTMENT CHART
Direction of travel Condition Adjust Nuts
Forward
Leading Bow *Clockwise
Trailing Bow **Counter-clockwise
Reverse
Leading Bow **Counter-clockwise
Trailing Bow *Clockwise
*Clockwise - Adjust the nut further onto the thread-
ed stud as if tightening it.
**Counter-clockwise - Back the nut off of the
threaded stud as if loosening it.
!
CAUTION
• NEVER ADJUST THE JAM NUTS MORE THAN
1/4 OF A TURN AT ONE TIME.
• ALWAYS RE-TIGHTEN THE JAM NUTS AND
ALLOW THE TOWER TO CYCLE TWICE
(START AND STOP) TO DETERMINE IF THE
TOWER IS STILL LEADING OR TRAILING.
3. Tighten jam nuts.
4. Tighten hardware to secure control bar to switch
pivot arm.
Allow tower to cycle (start and stop) twice to
determine if the tower is still running ahead or
behind. Adjust the jam nuts as needed until the
tower is in alignment.
5. Continue the Three Tower Method of alignment
down the entire length of the machine, make
adjustments as necessary to individual towers.
1
2
3
Figure 82-1 1. Hardware
2. Control Bar
3. Switch Pivot Arm
1
Figure 82-2 1. Jam Nut