Measuring Wheel Slip-Manually

NOTE: Tractors equipped with optional radar unit can automatically determine the percentage of wheel slip. Radar must be calibrated correctly. (See Controls and Instruments Section).

1. Mark a rear tire.

2. Mark a starting point on the ground with the tractor moving and implement lowered in the ground.

3. Follow tractor and mark the ground again where marked tire completes 10 full revolutions.

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4. Repeat procedure with implement raised at the same working speed. Count revolutions between same two marks.

5. Use second count and chart to determine slippage.

NOTE: Ideal slippage is 10-15 percent (8-12 percent for tractors with MFWD).

6. Adjust ballast or load to give correct slippage.

NOTE: Available horsepower is greatly reduced when wheel slip drops below minimum percent.

Wheel Slippage Chart
 
Wheel Revolutions % Result
(Step 4) Slip  
 
10   Remove Ballast
9-1/2 5  
     
9 10 Correct Ballast
8-1/2 15  
     
8 20 Add Ballast
7-1/2 25  
7 30  
     

 
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