Caterpillar D6 Dozer Service Manual 4R 5R 8U 9U 30027-4 And Engine Service Manual 0238-2

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Service Manual D6 4R 5R 8U 9U Form Number 30027-4

And 

Engine Service Manual for D6 Tractors. Form Number 30238-2

You get both service manuals in one bound set.