I agree with the last post (JBD)100%.
Depending on the age of the crane and the mfg. A lot of round rotor motor hoists have eddy current brakes. If they loose the current sensing relay in the control ckt or the actual power to the brake, it will affect the hoist in a similar manner.
Check the low points on the control. They get dirty and you have to clean them. PM (I know impossible when you are under-staffed....) goes a long way.
Glad to help out.
