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I assume by the choice of wording this is a new installation? Please confirm if that is the case.

The bolting together of the segments of the typical girth gear requires some precautions simply because of the shock that gets transmitted to the bolted connection while in operation. When the girth gear is assembled there should be liberal use of something like Locktite brand aneorobic thread locker, preferably a high strength version.

Usually Allen head cap screws are recommended for bolting the segments together. These are grade 8 as opposed to grade 5 bolts and the torque value should be increased accordingly to that for a grade 8 fastener. In addition, whatever bolting is utilized, make certain you are using the proper washers which are typically hardened. If you use a soft washer with a grade 8 bolt the washer will distort and in a short period of time the bolted connection will slaken off. This can also happen with grade 5 bolting. If you replace bolting, or keep the thought in mind for the future, consider grade 8 fasteners with the capability to lock-wire as well.

It is often recommended by the OEM to retorque the bolts after some period of operation. Some OEM's recommend lock-wire after the retorquing. Check with the particular OEM of this machine and see if that is the case.

If this is an overhauled machine, then the bolts and washers need to be replaced every time they are removed. You should not be using the bolts repeatedly.
RM

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