Vehicle Speed Calibration (Manual)

NOTE: The Vehicle Speed Calibration (Manual) procedure is not to be used with John Deere Dual Beam Radar.

Automatic vehicle calibration is used with John Deere Dual Beam radar or GPS signal device. See VEHICLE SPEED CALIBRATION (AUTOMATIC) in this Section.

On tractors equipped with no radar or single beam radar, a change in tire size or loading of tractor can affect wheel and ground speed which requires recalibration.

This procedure will compute tire rolling circumference value and radar proportion constant for the wheel and ground speed displays.

1. Install implement and ballast tractor as required for configuration.

2. On a hard level dry surface, mark out a 400 ft. (122 m.) course. Place easily visible markers at the start and end of the course.

3. Drive tractor up to, but do not cross, course start line.

4. Press vehicle Settings Switch (A) to view menu items on Display (D). Rotate Command Dial (B) to highlight Speed Cal and press Select Switch (C).

5. Display will read:

400 ft (122 m)  
Automatic  
Back  

 

6. Highlight 400 ft (122 m) , then press Select Switch.

When Select Switch is pressed, CommandCenter will display alternating messages shown in Display 1 and Display 2.
 
Display 1   Display 2  
Speed Cal
400 ft (122 m) start
Enter Course,
Driving 2 mph		   Speed Cal
400 ft (122 m) start
Press Select
At Marker		  

 
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A-Settings Switch
B-Command Dial
C-Select Switch
D-Display

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7. Set tractor speed to 3.2 km/h (2 mph) and press Select Switch as tractor crosses start line.

When Select Switch is pressed, CommandCenter will display alternating messages shown in Display 1 and Display 2.
 
Display 1   Display 2  
Speed Cal
400 ft (122 m) end
Exit Course,
Driving 2 mph		   Speed Cal
400 ft (122 m) end
Press Select
At Marker		  

 

8. Drive entire course length at 3.2 km/h (2 mph) and press Select Switch when crossing the course end marker.

NOTE: Most common reason failed message is received is because tractor speed falls below

3. 2 km/h (2 mph). Increase speed in 1.6 km/h (1 mph) increment, not to exceed 9.6 km/h (6 mph) and attempt procedure again. It may be necessary to consult your John Deere dealer for assistance if calibration is not successful.

When Select Switch is pressed, CommandCenter will display:
 
If Calibration is Successful   If Calibration is Unsuccessful  
 
Speed Cal
Calibration
Successful		   Speed Cal
Calibration
Failed		  

 

9. If failed message is received, perform procedure again.

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