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The question is a little difficult to understand.
Do you mean that it's a "Searchable Image" PDF with both a text layer, and an image layer, with the text layer generated by OCRing the image layer, and you want to remove the text layer?
I'm sure there are ways of doing that (e.g., converting the PDF to some other image format and then converting back, etc.), but I really can't see the point. The image layer is almost certainly almost entirely responsible for the large file size. And I don't see how the text layer could interfere with cropping either.
Or did you want to remove the image layer instead? That would only be worth it if the OCR was near perfect, or you were planning on cleaning it up manually, which is a huge time commitment.
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