| 摘要 |
A hydraulic transmission control system is provided for enhancing braking of a crawler-type tractor by controlling the engagement and disengagement of the clutches associated with right-hand and left-hand crawler tracks in response to actuation of the brakes associated with the tracks. The arrangement includes hydraulic pressure sensor means operatively associated with the hydraulic brake systems of the right-hand and left-hand crawler tracks. The system is arranged to selectively function such that actuation of both the right-hand and left-hand track brakes simultaneously prevents the normal disengagement of the track clutches, which permits the engine of the tractor to assist in braking. Actuation of a single brake pedal provides braking of the respective crawler track with disengagement of its respective clutch, while allowing the clutch of the opposite track to remain engaged to effect the pivot turning of the implement.
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