OPERATION
3.8.1 Auto Hea
der Height Control Sensor Output Voltage Range – C om bine
Requirements
The Auto Header Height Control (AHHC) sensor output must be within a specific voltage range for each combine,
or the AHH C feature will not work properly.
Table 3.10 Combine Voltage Limits
Combine
Low Voltage Limi t High Voltage Limit
Range (Difference
betweenHighand
Low Limits)
Challenger, Gleaner A, Massey Ferguson
0.5 V 4.5 V 2.5 V
Case IH 508
8/6088/7088,
5130/6130
/7130, 7010/8010,
7120/8120
/9120, and 7230/8230/9230
0.5 V 4.5 V 2.5 V
Case IH 2300/2500
2.8 V 7.2 V 4.0 V
Gleaner R and S Series
0.5 V 4.5 V 2.5 V
John Dee
re 50, 60, 70, and S Series 0.5 V 4.5 V 2.5 V
Lexion 500/600/700 Series
0.5 V 4.5 V 2.5 V
New Holland CR/CX - 5 V system
0.7 V 4.3 V 2.5 V
New Ho
lland CR/CX - 10 V system 2.8 V 7.2 V 4.1–4.4 V
NOTE:
Some combine models do not support checking sensor output voltage from the cab (early 23/2588 series,
Lexion 500/700 series). For these models, check output voltage manually—refer to Manually Checking
Voltage Range, page 91.
Manually Checking Voltage Range
You can manually check the output voltage range of the Auto Header Height Control (AHHC) sensor at the float
indicator box; however, some combines will allow y ou to check the voltage range from the cab. Refer to your
combine operator ’s manual or the AHHC instructions for your combine model in this document.
1. Position the header 6 in. (150 mm) above the ground,
and unlock the adapter float.
2. Check that float lock linkage is on down stops
(washer [A] and nut [B] cannot be moved) at both
locations.
NOTE:
If the header is not on down stops during the next
two steps, the voltage may go out of range during
operation causing a malfunction of the AHHC system.
Figure 3.94: Float Lock
147695 91 Revision A
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