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Bolt hole thread repair | CAT D9T bulldozer

A worn bolt hole threatens a CAT D9T. How does precision thread repair bring this bulldozer back to strength?
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Fixing the Transmission Cover & Bolt Hole Thread

The bolts holes are stripped and damaged on this Caterpillar D9T Bulldozer transmission cover! Someone has also tried to repair one of the holes using a self tapping thread repair insert but the hole ...