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In page Plough:

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The mould-board plough type is usually set by the method with which the plough is attached to the tractor and the way it is lifted and carried. The basic types are:

  • Mounted or integra – most use a three-point hitch and have a rear wheel in use only when ploughing. Some also have a gauge wheel to regulate maximum depth.[citation needed]
  • Semi-mounted – used principally for larger ploughs. These have a rear wheel which usually carries weight and side thrust when ploughing and sometimes the weight of the rear end of the plough when lifted. The front end of the plough is carried on the tractor lower or draft links.[citation needed]