MacDon FlexDraper FD75 - Replacing Auto Header Height Control Sensor

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4.3 Replacing Auto Header Height Control Sensor
The auto header height control (AHHC) sensor/potentiometer sends a signal to combine allowing it to maintain a cutting
height and optimize float as header follows ground contours.
To replace the AHHC sensor, follow these steps:
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B
A
B
Figure 4.3: AHHC Sensor
1. Disconnect the wiring harness from existing sensor (A).
2. Remove two nuts and bolts (B) that secure the sensor to
the bracket and remove sensor (A).
IMPORTANT:
Strictly follow the next steps to avoid damaging the new
sensor.
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A
B
C
Figure 4.4: AHHC Sensor
3. Position sensor control arm (A) against stop (B).
4. Install new sensor (C) onto the linkage arm with the wiring
plug facing away from the stop.
5. Pretension the sensor’s internal spring by rotating
sensor (C) until the bolt holes align with the holes on the
bracket.
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B
A
B
Figure 4.5: AHHC Sensor
6. Secure new sensor (A) to the bracket with two nuts and
bolts (B).
AUTO HEADER HEIGHT CONTROL