Measuring Wheel Slip (Manually)

RW26776-UN-12JAN00

RW26777-UN-13JAN00

IMPORTANT: To properly measure wheel slip, make sure that tire pressures are set for axle loads. (See Recommended Pressures tables in both the Front Wheels, Tires, and Treads and Rear Wheels, Tires, and Treads sections.)

NOTE: Tractors equipped with optional radar unit can automatically determine the percentage of wheel slip. Radar must be calibrated correctly. (See CommandCenter™ 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 ten full revolutions.

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 8—12% (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 (Step 4)	% Slip	Result
   10	0	Remove Ballast
   9-1/2	5	Remove Ballast
   9	10	Correct Ballast
   8-1/2	15	Add Ballast
   8	20	Add Ballast
   7-1/2	25	Add Ballast
   7	30	Add Ballast