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A travel drive gear engagement mechanism for a tractor unit includes a clutch lever that has a cam portion. The clutch lever is configured to rotate between a first position and a second position at a point that is offset from a center of an elongated portion of the cam portion. The engagement mecha

A travel drive gear engagement mechanism for a tractor unit includes a clutch lever that has a cam portion. The clutch lever is configured to rotate between a first position and a second position at a point that is offset from a center of an elongated portion of the cam portion. The engagement mechanism also includes a connecting member that operatively connects the cam portion of the clutch lever to a drive gear of a tractor unit. The connecting member is operatively connected to the cam portion at the offset point. The clutch level and connecting member are configured such that the drive gear engages a track gear when the clutch lever is in the first position and disengages from the track gear when the clutch lever is in the second position.

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1. A travel drive gear engagement mechanism for a tractor unit, comprising: a clutch lever comprising a cam portion, the clutch lever configured to rotate between a first position and a second position at a point that is offset from a center of an elongated portion of the cam portion; anda connectin

1. A travel drive gear engagement mechanism for a tractor unit, comprising: a clutch lever comprising a cam portion, the clutch lever configured to rotate between a first position and a second position at a point that is offset from a center of an elongated portion of the cam portion; anda connecting member operatively connecting the cam portion of the clutch lever to a drive gear of a tractor unit,wherein the connecting member is operatively connected to the cam portion at the offset point, andwherein the clutch level and connecting member are configured such that the drive gear engages a track gear when the clutch lever is in the first position and disengages from the track gear when the clutch lever is in the second position,wherein the connecting member comprises a pivot point,wherein the connecting member pivots around the pivot point in a first direction to engage the drive gear to the track gear when the clutch lever is rotated to the first position, andwherein the connecting member pivots around the pivot point in a second direction to disengage the drive gear from the track gear when the clutch lever is rotated to the second position. 2. The travel drive gear engagement mechanism of claim 1, further comprising a first biasing mechanism configured to apply an engaging force to maintain engagement of the drive gear with the track gear. 3. The travel drive gear engagement mechanism of claim 1, wherein the offset point is along a centerline of the elongated portion of the cam portion. 4. The travel drive gear engagement mechanism of claim 3, wherein the cam portion is rotated over the centerline as the clutch lever is rotated between the first position and the second position. 5. The travel drive gear engagement mechanism of claim 4, wherein the clutch lever is disposed on top of the tractor unit. 6. The travel drive gear engagement mechanism of claim 1, further comprising a second biasing mechanism configured to apply a retraction force to prevent engagement of the drive gear with the track gear. 7. A travel drive gear engagement mechanism for a tractor unit, comprising: a clutch lever comprising a cam portion, the clutch lever configured to rotate between a first position and a second position at a point that is offset from a center of an elongated portion of the cam portion;a connecting member operatively connecting the cam portion of the clutch lever to a drive gear of a tractor unit; anda first biasing mechanism configured to apply an engaging force to maintain engagement of the drive gear with the track gear;wherein the connecting member is operatively connected to the cam portion at the offset point,wherein the clutch level and connecting member are configured such that the drive gear engages a track gear when the clutch lever is in the first position and disengages from the track gear when the clutch lever is in the second position, andwherein the first biasing mechanism comprises a first spring, the first spring disposed such that the engaging force is applied to the connecting member when the clutch lever is in the first position. 8. The travel drive gear engagement mechanism of claim 7, wherein the offset point is along a centerline of the elongated portion of the cam portion. 9. The travel drive gear engagement mechanism of claim 8, wherein the cam portion is rotated over the centerline as the clutch lever is rotated between the first position and the second position. 10. The travel drive gear engagement mechanism of claim 9, wherein the clutch lever is disposed on top of the tractor unit. 11. A travel drive gear engagement mechanism for a tractor unit, comprising: a clutch lever comprising a cam portion, the clutch lever configured to rotate between a first position and a second position at a point that is offset from a center of an elongated portion of the cam portion;a connecting member operatively connecting the cam portion of the clutch lever to a drive gear of a tractor unit; anda second biasing mechanism configured to apply a retraction force to prevent engagement of the drive gear with the track gear,wherein the connecting member is operatively connected to the cam portion at the offset point,wherein the clutch level and connecting member are configured such that the drive gear engages a track gear when the clutch lever is in the first position and disengages from the track gear when the clutch lever is in the second position, andwherein the second biasing mechanism comprises a second spring, the second spring disposed such that the retraction force is applied to the connecting member when the clutch lever is in the second position. 12. The travel drive gear engagement mechanism of claim 11, wherein the offset point is along a centerline of the elongated portion of the cam portion. 13. The travel drive gear engagement mechanism of claim 12, wherein the cam portion is rotated over the centerline as the clutch lever is rotated between the first position and the second position. 14. The travel drive gear engagement mechanism of claim 13, wherein the clutch lever is disposed on top of the tractor unit.