| 摘要 |
A height adjuster mechanism for mounting on a frame of a grass and/or ground treatment machine to vary the height of the frame relative to a ground-engaging roller assembly and thereby adjust the height setting of a grass and/or ground treatment module mounted on the frame. The mechanism includes an open-topped housing provided on a rotary adjuster and having an upper surface which defines a height adjustment reference datum level. An insert is movable up and down within the open-topped housing in which the upper surface of the insert can be adjusted to be substantially flush or coplanar with the upper surface of the open-topped housing so as to set a datum level of the treatment module. Means are provided for determining the extent of angular adjustment of the rotary adjuster so as to set any required height adjustment of the treatment module
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