Spoils collection transition assemblies with sacrifical liners

A housing for ground cutting machinery, comprising

• a body with walls forming a partially enclosed cavity around a ground cutting blade with an open bottom through which at least a portion of the ground cutting blade is extended for use, the body having a lower spoils collection portion extending behind the ground cutting blade;
• and
• a transition assembly comprising
• an upper interface for connecting to a spoils collection system, the upper interface including an upper collection port,
• a tube assembly including a bore defined by a surrounding sidewall extending from the towards a lower opening at the lower spoils collection portion, wherein the bore is aligned with a direction that spoils are ejected from the ground cutting blade during operation of the ground cutting machine;
• and
• a replaceable sacrificial plate disposed within the transition assembly at a position where a significant portion of abrasive force on the housing generated by the spoils ejected by the blade occurs at the surface of the sacrificial plate.