| 摘要 |
An elective down pressure system for cutting units of a grass mowing machine with lift and lower mechanisms connected to the lift arms with lost motion couplings that may be set to either a downforce position in which the lift and lower mechanisms urge the lift arms to apply downforce to the cutting units while thy are on the ground surface, or a no downforce position in which the lift and lower mechanisms discontinue urging the lift arms to apply downforce once the cutting units are on the ground surface.
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