MacDon FD75 - Adjusting Voltage Limits

214323 105 Revision A
1003462
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Figure 3.127: Measuring Voltage at Float
Indicator Box
4. Use a voltmeter (A) to measure voltage between
ground (Pin 2) and signal (Pin 3) wires at AHHC sensor
in float indicator box. Ensure it is at high voltage limit for
combine. Refer to Table 3.13, page 103.
NOTE:
The harness connector must be plugged into sensor.
1003465
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Figure 3.128: Measuring Voltage at Float
Indicator Box
5. Fully lower combine feeder house, and float header up
off down stops (float indicator should be at 4, and
adapter should be fully separated from header).
NOTE:
You may need to hold HEADER DOWN switch for a few
seconds to ensure feeder house is fully lowered.
6. Use a voltmeter (A) to measure voltage between
ground and signal wires at AHHC sensor in float
indicator box. It should be at low voltage limit for
combine. Refer to Table 3.13, page 103.
NOTE:
The harness connector must be plugged into sensor.
7. Adjust voltage limits (refer to Adjusting Voltage Limits,
page 105) if sensor voltage is not within low and high
limits or if range between low and high limits is
insufficient. Refer to Table 3.13, page 103.
Adjusting Voltage Limits
NOTE:
The auto header height control (AHHC) sensor assemblies used for CLAAS and some New Holland combines are
slightly different from sensor assemblies used for other combine models—all three assemblies are illustrated in this
procedure.
OPERATION