Rear Wheel Slip Measuring Methods

LX000402-UN-15AUG94

1. Step 1: Mark rear tire (A).
2. Step 2: Mark ground next to rear tire (using a stake) to indicate starting point (B).
3. Step 3: Drive tractor in straight line with implement in field position until rear wheel has completed 10 full rotations (C).
4. Step 4: Mark ground (with a stake) at point where rear wheel completed 10 full rotations (D).
5. Step 5: Return tractor to starting point and cover same route marked out on ground with the implement raised (in transport position). Count the number of rotations completed by rear wheel between the two markers (E).

   The ratio of the number of rotations of the rear wheel with load and without load is the slip rate.

   The formula below is used to draw up the following chart:

   	(step 3 rotations - step 5 rotations) X 100
   Slip rate (%) =
   	Step 3 rotations

   Step 3 rotations	Step 5 rotations	Slip rate (%)
   10	10.0	0
   10	9.5	5
   10	9.2	8
   10	9.0	10
   10	8.8	12
   10	8.5	15
   10	8.0	20
   10	7.5	25
   10	7.0	30

6. Step 6: Add more weight when slip is excessive. For rates below minimum, weight must be removed.