Header Height Control Theory Of Operation

N88220-UN-25MAR10

N88221-UN-25MAR10

A - Row Units Raise/Lower Button

B - Row Units Height Adjust Buttons

C - Selection Dial

D - Height Sensing Response Rate Dial

E - Lower All Units Switch

F - Raise All Units Switch

G - Raise Left-Hand Units Switch

H - Raise Right-Hand Units Switch

The header height control system is an electrohydraulic system that automatically maintains the row units at the desired operating height for picking cotton. Height sensing shoes on the row units follow the contour of the ground and signal the control unit to raise or lower the left or right toolbar as required in response to changing ground conditions.

Row units raise/lower button (A) is a four position switch which allows the operator to:

• raise all units
• lower all units
• raise left-hand units
• raise right-hand units

The raise/lower button allows the operator to manually control row unit height in response to unique field conditions or obstacles in the field.

Row unit height adjust buttons (B) and selection dial (C) are used to preset the optimum operating height for the left- and right-hand row units.

Height sensing response rate dial (D) allows the operator to adjust how quickly the row units react (raise or lower) to changing ground conditions while in the height sensing mode of operation. (See HEADER HEIGHT CONTROL RESPONSE RATE ADJUSTMENT in this section.)

The header height control system is activated when row units are engaged and the operator lowers units using lower all units switch (E). The system is deactivated when the operator raises the units using raise all units switch (F).

Left-hand or right-hand row units can be raised individually by pressing switch (G) or (H), respectively. When using these switches, header height control is deactivated only on the row units being raised. Header height control is reactivated to those units when they are lowered using lower all units switch (E).

Header height control calibration procedure should be performed at the beginning of each season, or any time a component of the system is replaced. (See HEADER HEIGHT CONTROL CALIBRATION in this section.)