Crane will not swing at start up, but will kick out of weathervane. Manually lift swing brake and attempt swing again, and crane will swing normally, however will not brake normally.
Look for +20VDC at V100F, and verified. Look for +20VDC at K600M #7 and verified. Found no voltage at K600M #8. Although contactor was energized, contacts were not closed. Replace K600M.
**Note** this was specifically on a Hup 32-27 which only has 1 swing motor. Condition may be different with 2 swing motors on Hup 40-30