While swinging with an empty grapple, a log loader had its main boom foot pin drift in on the cab side.

The lock bolt in the end of the pin came free and broke. This allowed the main pin to drift in, free of the main boom foot boss, and as a result the boom twisted sideways and out of proper position. With this happening, the boom foot base and the lift cylinders twisted. The log loader operator had the boom low to the ground at the time of the incident and there were no trucks close by.

The expanding-style pin that drifted had recently been re-torqued at its last servicing.