MacDon PW8 - Height Sensor Output Voltage Range

215575 111 Revision B
4.4 Height Sensor Output Voltage Range – Combine Requirements
The height sensor output must be within a specific voltage range for each combine or the auto header height control
(AHHC) feature will not work properly.
Table 4.1 Combine Voltage Range
Combine
Low Voltage Limit High Voltage Limit
Minimum Range
Challenger
®
Gleaner
®
Massey Ferguson
®
IDEAL
™
0.7 V 4.3 V 2.5 V
Case IH 7/8010, 5/6/7088, 7/8/9120,
5/6/7130, 5/6/7140, 7/8/9230,
7/8/9240
0.7 V 4.3 V 2.5 V
John Deere 60/70/S/T Series
0.7 V 4.3 V 2.5 V
New Holland CR/CX – 5 V system
0.7 V 4.3 V 2.5 V
New Holland CR/CX – 10 V system
3.0 V 7.0 V 4.1–4.4 V
NOTE:
For instructions on manually checking the voltage range, refer to 4.4.1 Manually Checking Voltage Range, page 111.
4.4.1 Manually Checking Voltage Range
In some combines, the output voltage range for the auto header height control (AHHC) sensors can be checked from the
cab. Otherwise, follow this procedure.
1. Position the header so that the header wheels are approximately 150 mm (6 in.) above the ground.
NOTE:
Ensure that the float spring is fully extended. For instructions, refer to 3.12.4 Adjusting Header Float, page 93 . If the
float spring is not fully extended, the voltage may go out of range during header operation, which can cause the AHHC
system to malfunction.
2. Shut down the combine. Position the key so that power is still supplied to the sensors.
3. Open the left endshield. For instructions, refer to 3.3.1 Opening Left Endshield, page 25.
AUTO HEADER HEIGHT CONTROL