They are talking about an innovation (which could be an aspect of an equipment drive, or not) which increases/flexes engine output/power in relation to a standard, mother block or power source used in a wide variety of different tractors/applications. Because the power can be varied one can now use the same engine block (set to produce different levels of power using the innovation) in different tractors or applications. The word moederblok is here being used as standard block or standard engine - as in the case of the Rover V8 engine based on the Buick V8 mother block - which became the common power plant for a wide variety of cars, sportscars and 4wds. I don't think mother block is a standard equivalent for moederblok and to invent one would require explanation and be unnecessary and redundant. The source text in any event adds the word hetzelfde, meaning common or the same. So I used this instead of mother. I have also not (redundantly) repeated the use of delta or range in the sample sentence, below. Instead, the meaning of delta in the source is covered by the use of 'up to' in the sample. I suspect indeed that the source sentence is unfortunately constructed.

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Note added at 13 hrs (2015-06-18 09:20:03 GMT)
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motorblok = engine vs. block vs. cylinder block:
I think that an engine or engine block, in the mind of the source author, becomes a mother engine or mother block when it is the basic power plant in a variety of power output variations or other applications. The reason they use both mother and motor block is that Dutch often call an engine a block. While English usage distinguishes between engine - complete - and engine block: The latter being just the part below the head, containing cylinders and crankshaft - also referred to as the cylinder block. So it looks to me as if you should use engine throughout for motorblok and standard/source/the same engine when translating moederblok. Of course if the source intended to refer specifically to the cylinder block rather than the whole engine, then use standard or common cylinder block and not engine as the translation. This would apply, for instance, if the innovation relates specifically to the head - and that the head is therefore the innovative, variable element in the engine which, coupled with the same or standard cylinder block, enables variable power.