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How to calculate the strain on bolts in the fixture of a DC motor?

Hello I am working on a university project where we design a forklift. One of the tasks I have to do is to calculate the strain of the motor torque on the bolts that fixate it to the forklift and to design the fixture itself. I have skipped a subject, which would have been useful to this problem and I am having problems solving it. Can somebody give me a basic understanding of what I have to do?

Here is the technical drawing of the motor in question with the location of the bolts(PMG 132 Heinzmann):

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Any help would be much appreciated