Longitudinal slip efficiency of driving wheels of off road vehicles is function of not only slip of all driving wheels but also their gross traction force. In this work, the slip efficiency was ascertained for a mechanical front wheel drive (MFWD) tractor in a tillage practice. Front and rear driving wheels of the MFWD tractor performed in unequal traction circumstances (size, inflation pressure, and dynamic vertical load) and soil cone indices. Obtained results indicated that the slip efficiency nonlinearly dropped from 0.94 to 0.74 as simultaneous augmentation of slip ratio of the rear wheels to that of the front wheels (0.72-0.87) along with ratio increment of gross traction force of the rear wheels to that of front wheels (1.81-4.93). These conditions occurred, when draft force requirements of implement augmented from 8.58 to 25.85 kN. Hence, it can be pointed out that the maximum slip efficiency as well as overall power efficiency of the MFWD tractor in tillage practices would be achieved at the same slip in accordance with the same gross traction force of the front and rear wheels. To do this for, specific tire type (radial or bias ply), automatic slip control of the wheels by implementing wheel slip control system would be beneficial, especially in case of lower slip than 0.2 for achievement of maximum tractive efficiency. It must be noted that adjustment of inflation pressure of the tires is also advantageous followed by ballast weight application in this realm.

越野车辆的驱动轮的纵向滑移效率不仅是所有驱动轮的滑移，而且是它们的总牵引力的函数。在这项工作中，在耕作实践中确定了机械前轮驱动（MFWD）拖拉机的滑移效率。MFWD拖拉机的前后驱动轮在不同的牵引力条件下（尺寸，充气压力和动态垂直载荷）和土壤锥度指标工作。结果表明，随着后轮滑移率与前轮滑移率的同时增大（0.72-0.87）以及后轮总牵引力与前轮滑移率的比值增加，滑移效率从0.94非线性下降至0.74。车轮（1.81-4.93）。这些情况发生在机具的吃水力要求从8.58 kN增加到25.85 kN时。因此，应该指出的是，在耕作实践中，MFWD拖拉机的最大打滑效率以及总动力效率将根据前轮和后轮的相同总牵引力在相同打滑的情况下实现。为此，对于特定的轮胎类型（径向或斜交帘布层），通过实施车轮打滑控制系统对车轮进行自动打滑控制将是有益的，特别是在打滑度小于0.2的情况下，以实现最大牵引效率。必须指出的是，在该领域中调整轮胎的充气压力也是有利的，随后施加压载重。